Use helm for install

update  README.md

.gitignore

@@ -0,0 +1,72 @@
+# OSX leaves these everywhere on SMB shares
+._*
+
+# OSX trash
+.DS_Store
+
+# Eclipse files
+.classpath
+.project
+.settings/**
+
+# Files generated by JetBrains IDEs, e.g. IntelliJ IDEA
+.idea/
+*.iml
+
+# Vscode files
+.vscode
+
+# This is where the result of the go build goes
+/output*/
+/_output*/
+/_output
+/bin
+
+# Emacs save files
+*~
+\#*\#
+.\#*
+
+# Vim-related files
+[._]*.s[a-w][a-z]
+[._]s[a-w][a-z]
+*.un~
+Session.vim
+.netrwhist
+
+# cscope-related files
+cscope.*
+
+# Go test binaries
+*.test
+
+# JUnit test output from ginkgo e2e tests
+/junit*.xml
+
+# Mercurial files
+**/.hg
+**/.hg*
+
+# Vagrant
+.vagrant
+
+.tags*
+
+# Test artifacts produced by Jenkins jobs
+/_artifacts/
+
+# Go dependencies installed on Jenkins
+/_gopath/
+
+# direnv .envrc files
+.envrc
+
+# This file used by some vendor repos (e.g. github.com/go-openapi/...) to store secret variables and should not be ignored
+!\.drone\.sec
+
+# Godeps or dep workspace
+/Godeps/_workspace
+
+/bazel-*
+*.pyc
+profile.cov

Dockerfile

@@ -0,0 +1,34 @@
+# Copyright 2023.
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# ---- Build ----
+FROM golang:1.23-alpine AS build
+WORKDIR /build
+# Copy sources
+ADD . .
+# Get dependencies
+RUN make go-build
+# Compile
+RUN CGO_ENABLED=0 go build -a -o webdavplugin ./cmd/webdav
+
+
+# ---- Release ----
+FROM alpine AS release
+# Install required packages
+RUN apk add --no-cache davfs2
+
+# Copy build-target
+COPY --from=build /build/webdavplugin .
+
+ENTRYPOINT ["/webdavplugin"]

README.md

@@ -0,0 +1,41 @@
+# Webdav CSI driver for Kubernetes
+
+### Overview
+
+This is a repository for webdav csi driver, csi plugin name: `webdav.csi.io`. This driver supports dynamic provisioning of Persistent Volumes via Persistent Volume Claims by creating a new sub directory under webdav server.
+
+### Deploy CSI
+#### With Helm
+```bash
+helm install -n webdav-csi-driver webdav-csi-driver helm/
+```
+
+### Quick start with kind 
+
+#### Build plugin image
+```bash
+make docker-build
+```
+
+#### Start kind cluster
+```bash
+kind create cluster --image kindest/node:v1.27.3
+```
+
+### Load plugin image to kind cluster
+```bash
+kind load docker-image registry.k8s.io/sig-storage/csi-provisioner:v3.6.2
+kind load docker-image registry.k8s.io/sig-storage/livenessprobe:v2.11.0
+kind load docker-image registry.k8s.io/sig-storage/csi-node-driver-registrar:v2.9.1
+kind load docker-image localhost:5000/webdavplugin:v0.0.1
+```
+
+
+
+### Tests
+```bash
+kubectl apply -f examples/csi-webdav-secret.yaml
+kubectl apply -f examples/csi-webdav-storageclass.yaml
+kubectl apply -f examples/csi-webdav-dynamic-pvc.yaml
+kubectl apply -f examples/csi-webdav-pod.yaml
+```

cmd/webdav/main.go

@@ -0,0 +1,55 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package main
+
+import (
+	"flag"
+	"os"
+
+	"git.ruekov.eu/ruakij/webdav-csi-driver/pkg/webdav"
+	"k8s.io/klog/v2"
+)
+
+var (
+	endpoint              = flag.String("endpoint", "unix://tmp/csi.sock", "CSI endpoint")
+	nodeID                = flag.String("nodeid", "", "node id")
+	mountPermissions      = flag.Uint64("mount-permissions", 0, "mounted folder permissions")
+	driverName            = flag.String("drivername", "", "name of the driver")
+	workingMountDir       = flag.String("working-mount-dir", "/tmp/csi-storage", "working directory for provisioner to mount davfs shares temporarily")
+	defaultOnDeletePolicy = flag.String("default-ondelete-policy", "", "default policy for deleting subdirectory when deleting a volume")
+)
+
+func main() {
+	klog.InitFlags(nil)
+	_ = flag.Set("logtostderr", "true")
+	flag.Parse()
+	if *nodeID == "" {
+		klog.Warning("nodeid is empty")
+	}
+
+	driverOptions := webdav.DriverOpt{
+		Name:                  *driverName,
+		NodeID:                *nodeID,
+		Endpoint:              *endpoint,
+		MountPermissions:      *mountPermissions,
+		WorkingMountDir:       *workingMountDir,
+		DefaultOnDeletePolicy: *defaultOnDeletePolicy,
+	}
+	d := webdav.NewDriver(&driverOptions)
+	d.Run()
+	os.Exit(0)
+}

examples/csi-webdav-dynamic-pvc.yaml

@@ -0,0 +1,12 @@
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: pvc-webdav-dynamic
+spec:
+  accessModes:
+    - ReadWriteMany
+  resources:
+    requests:
+      storage: 10Gi
+  storageClassName: webdav-sc

examples/csi-webdav-pod.yaml

@@ -0,0 +1,17 @@
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: nginx
+spec:
+  containers:
+  - name: nginx
+    image: nginx:latest
+    imagePullPolicy: IfNotPresent
+    volumeMounts:
+    - name: pvc-webdav-dynamic
+      mountPath: /var/www/html
+  volumes:
+  - name: pvc-webdav-dynamic
+    persistentVolumeClaim:
+      claimName: pvc-webdav-dynamic

examples/csi-webdav-secret.yaml

@@ -0,0 +1,9 @@
+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: webdav-secrect
+type: Opaque
+data:
+  username: YWRtaW4=
+  password: YWRtaW4=

examples/csi-webdav-storageclass.yaml

@@ -0,0 +1,16 @@
+---
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: webdav-sc
+provisioner: webdav.csi.io
+parameters:
+  # alist folder webdav address
+  share: http://ip:port/dav/media 
+  csi.storage.k8s.io/provisioner-secret-name: "webdav-secrect"
+  csi.storage.k8s.io/provisioner-secret-namespace: "default"
+  csi.storage.k8s.io/node-publish-secret-name: "webdav-secrect"
+  csi.storage.k8s.io/node-publish-secret-namespace: "default"
+reclaimPolicy: Delete
+volumeBindingMode: Immediate
+mountOptions:

go.mod

@@ -0,0 +1,24 @@
+module git.ruekov.eu/ruakij/webdav-csi-driver
+
+go 1.23
+
+require (
+	github.com/container-storage-interface/spec v1.10.0
+	github.com/moby/sys/mountinfo v0.7.2
+	golang.org/x/sys v0.24.0
+	google.golang.org/grpc v1.65.0
+	google.golang.org/protobuf v1.34.2
+	k8s.io/klog/v2 v2.130.1
+	k8s.io/utils v0.0.0-20240821151609-f90d01438635
+	sigs.k8s.io/yaml v1.4.0
+)
+
+require (
+	github.com/go-logr/logr v1.4.2 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
+	github.com/rogpeppe/go-internal v1.12.0 // indirect
+	golang.org/x/net v0.28.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240823204242-4ba0660f739c // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+)

go.sum

@@ -0,0 +1,42 @@
+github.com/container-storage-interface/spec v1.10.0 h1:YkzWPV39x+ZMTa6Ax2czJLLwpryrQ+dPesB34mrRMXA=
+github.com/container-storage-interface/spec v1.10.0/go.mod h1:DtUvaQszPml1YJfIK7c00mlv6/g4wNMLanLgiUbKFRI=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/go-logr/logr v1.4.2 h1:6pFjapn8bFcIbiKo3XT4j/BhANplGihG6tvd+8rYgrY=
+github.com/go-logr/logr v1.4.2/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/moby/sys/mountinfo v0.7.2 h1:1shs6aH5s4o5H2zQLn796ADW1wMrIwHsyJ2v9KouLrg=
+github.com/moby/sys/mountinfo v0.7.2/go.mod h1:1YOa8w8Ih7uW0wALDUgT1dTTSBrZ+HiBLGws92L2RU4=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
+github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
+golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
+golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
+golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
+golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.17.0 h1:XtiM5bkSOt+ewxlOE/aE/AKEHibwj/6gvWMl9Rsh0Qc=
+golang.org/x/text v0.17.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240823204242-4ba0660f739c h1:Kqjm4WpoWvwhMPcrAczoTyMySQmYa9Wy2iL6Con4zn8=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240823204242-4ba0660f739c/go.mod h1:UqMtugtsSgubUsoxbuAoiCXvqvErP7Gf0so0mK9tHxU=
+google.golang.org/grpc v1.65.0 h1:bs/cUb4lp1G5iImFFd3u5ixQzweKizoZJAwBNLR42lc=
+google.golang.org/grpc v1.65.0/go.mod h1:WgYC2ypjlB0EiQi6wdKixMqukr6lBc0Vo+oOgjrM5ZQ=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
+k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
+k8s.io/utils v0.0.0-20240821151609-f90d01438635 h1:2wThSvJoW/Ncn9TmQEYXRnevZXi2duqHWf5OX9S3zjI=
+k8s.io/utils v0.0.0-20240821151609-f90d01438635/go.mod h1:OLgZIPagt7ERELqWJFomSt595RzquPNLL48iOWgYOg0=
+sigs.k8s.io/yaml v1.4.0 h1:Mk1wCc2gy/F0THH0TAp1QYyJNzRm2KCLy3o5ASXVI5E=
+sigs.k8s.io/yaml v1.4.0/go.mod h1:Ejl7/uTz7PSA4eKMyQCUTnhZYNmLIl+5c2lQPGR2BPY=

helm/Chart.yaml

@@ -0,0 +1,4 @@
+apiVersion: v2
+name: webdav-csi-driver
+description: A Helm chart for deploying CSI WebDAV Storage Driver
+version: 0.0.1

helm/templates/controller.yaml

@@ -0,0 +1,124 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: webdav-csi-controller
+  namespace: kube-system
+spec:
+  replicas: {{ .Values.controller.replicas }}
+  selector:
+    matchLabels:
+      app: webdav-csi-controller
+  template:
+    metadata:
+      labels:
+        app: webdav-csi-controller
+    spec:
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      serviceAccountName: webdav-csi-sa
+      nodeSelector:
+        kubernetes.io/os: linux
+      priorityClassName: system-cluster-critical
+      securityContext:
+        seccompProfile:
+          type: RuntimeDefault
+      tolerations:
+        - key: "node-role.kubernetes.io/master"
+          operator: "Exists"
+          effect: "NoSchedule"
+        - key: "node-role.kubernetes.io/controlplane"
+          operator: "Exists"
+          effect: "NoSchedule"
+        - key: "node-role.kubernetes.io/control-plane"
+          operator: "Exists"
+          effect: "NoSchedule"
+      containers:
+        - name: csi-provisioner
+          image: {{ .Values.csiProvisioner.image.name }}:{{ .Values.csiProvisioner.image.tag }}
+          imagePullPolicy: {{ .Values.csiProvisioner.image.pullPolicy }}          
+          args:
+            - "-v=2"
+            - "--csi-address=$(ADDRESS)"
+            - "--leader-election"
+            - "--leader-election-namespace=kube-system"
+            - "--extra-create-metadata=true"
+            - "--timeout=1200s"
+          env:
+            - name: ADDRESS
+              value: /csi/csi.sock
+          volumeMounts:
+            - mountPath: /csi
+              name: socket-dir
+          resources:
+            limits:
+              memory: {{ .Values.controller.resources.limits.memory }}
+            requests:
+              cpu: {{ .Values.controller.resources.requests.cpu }}
+              memory: {{ .Values.controller.resources.requests.memory }}
+        - name: liveness-probe
+          image: {{ .Values.livenessProbe.image.name }}:{{ .Values.livenessProbe.image.tag }}
+          imagePullPolicy: {{ .Values.livenessProbe.image.pullPolicy }}          
+          args:
+            - --csi-address=/csi/csi.sock
+            - --probe-timeout=3s
+            - --health-port=29652
+            - --v=2
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi
+          resources:
+            limits:
+              memory: 100Mi
+            requests:
+              cpu: 10m
+              memory: 20Mi
+        - name: webdav
+          image: {{ .Values.controller.image.name }}:{{ .Values.controller.image.tag }}
+          imagePullPolicy: {{ .Values.controller.image.pullPolicy }}
+          securityContext:
+            privileged: true
+            capabilities:
+              add: ["SYS_ADMIN"]
+            allowPrivilegeEscalation: true
+          args:
+            - "-v=5"
+            - "--nodeid=$(NODE_ID)"
+            - "--endpoint=$(CSI_ENDPOINT)"
+          env:
+            - name: NODE_ID
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+            - name: CSI_ENDPOINT
+              value: unix:///csi/csi.sock
+          ports:
+            - containerPort: 29652
+              name: healthz
+              protocol: TCP
+          livenessProbe:
+            failureThreshold: 5
+            httpGet:
+              path: /healthz
+              port: healthz
+            initialDelaySeconds: 30
+            timeoutSeconds: 10
+            periodSeconds: 30
+          volumeMounts:
+            - name: pods-mount-dir
+              mountPath: /var/lib/kubelet/pods
+              mountPropagation: "Bidirectional"
+            - mountPath: /csi
+              name: socket-dir
+          resources:
+            limits:
+              memory: {{ .Values.controller.resources.limits.memory }}
+            requests:
+              cpu: {{ .Values.controller.resources.requests.cpu }}
+              memory: {{ .Values.controller.resources.requests.memory }}
+      volumes:
+        - name: pods-mount-dir
+          hostPath:
+            path: /var/lib/kubelet/pods
+            type: Directory
+        - name: socket-dir
+          emptyDir: {}

helm/templates/default-storageClass.yaml

@@ -0,0 +1,13 @@
+{{- if .defaultStorageClass }}
+apiVersion: storage.k8s.io/v1
+kind: StorageClass
+metadata:
+  name: {{ .defaultStorageClass.name }}
+provisioner: webdav.csi.io
+parameters:
+  {{- toYaml .defaultStorageClass.parameters | nindent 2 }}
+reclaimPolicy: {{ .defaultStorageClass.reclaimPolicy }}
+volumeBindingMode: {{ .defaultStorageClass.volumeBindingMode }}
+mountOptions:
+  {{- toYaml .defaultStorageClass.mountOptions | nindent 2 }}
+{{- end }}

helm/templates/driverinfo.yaml

@@ -0,0 +1,8 @@
+apiVersion: storage.k8s.io/v1
+kind: CSIDriver
+metadata:
+  name: webdav.csi.io
+spec:
+  attachRequired: false
+  volumeLifecycleModes:
+  - Persistent

helm/templates/node.yaml

@@ -0,0 +1,136 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: webdav-csi-node
+  namespace: kube-system
+spec:
+  updateStrategy:
+    rollingUpdate:
+      maxUnavailable: 1
+    type: RollingUpdate
+  selector:
+    matchLabels:
+      app: webdav-csi-node
+  template:
+    metadata:
+      labels:
+        app: webdav-csi-node
+    spec:
+      hostNetwork: true
+      dnsPolicy: ClusterFirstWithHostNet
+      serviceAccountName: webdav-csi-sa
+      priorityClassName: system-node-critical
+      securityContext:
+        seccompProfile:
+          type: RuntimeDefault
+      nodeSelector:
+        kubernetes.io/os: linux
+      tolerations:
+        - operator: "Exists"
+      containers:
+        - name: liveness-probe
+          image: {{ .Values.livenessProbe.image.name }}:{{ .Values.livenessProbe.image.tag }}
+          imagePullPolicy: {{ .Values.livenessProbe.image.pullPolicy }}
+          args:
+            - --csi-address=/csi/csi.sock
+            - --probe-timeout=3s
+            - --health-port=29653
+            - --v=2
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi
+          resources:
+            limits:
+              memory: 100Mi
+            requests:
+              cpu: 10m
+              memory: 20Mi
+        - name: node-driver-registrar
+          image: registry.k8s.io/sig-storage/csi-node-driver-registrar:v2.9.1
+          imagePullPolicy: IfNotPresent
+          args:
+            - --v=2
+            - --csi-address=/csi/csi.sock
+            - --kubelet-registration-path=$(DRIVER_REG_SOCK_PATH)
+          livenessProbe:
+            exec:
+              command:
+                - /csi-node-driver-registrar
+                - --kubelet-registration-path=$(DRIVER_REG_SOCK_PATH)
+                - --mode=kubelet-registration-probe
+            initialDelaySeconds: 30
+            timeoutSeconds: 15
+          env:
+            - name: DRIVER_REG_SOCK_PATH
+              value: /var/lib/kubelet/plugins/webdav-csiplugin/csi.sock
+            - name: KUBE_NODE_NAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi
+            - name: registration-dir
+              mountPath: /registration
+          resources:
+            limits:
+              memory: 100Mi
+            requests:
+              cpu: 10m
+              memory: 20Mi
+        - name: webdav
+          securityContext:
+            privileged: true
+            capabilities:
+              add: ["SYS_ADMIN"]
+            allowPrivilegeEscalation: true
+          image: {{ .Values.node.image.name }}:{{ .Values.node.image.tag }}
+          imagePullPolicy: {{ .Values.node.image.pullPolicy }}
+          args:
+            - "-v=5"
+            - "--nodeid=$(NODE_ID)"
+            - "--endpoint=$(CSI_ENDPOINT)"
+          env:
+            - name: NODE_ID
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+            - name: CSI_ENDPOINT
+              value: unix:///csi/csi.sock
+          ports:
+            - containerPort: 29653
+              name: healthz
+              protocol: TCP
+          livenessProbe:
+            failureThreshold: 5
+            httpGet:
+              path: /healthz
+              port: healthz
+            initialDelaySeconds: 30
+            timeoutSeconds: 10
+            periodSeconds: 30
+          volumeMounts:
+            - name: socket-dir
+              mountPath: /csi
+            - name: pods-mount-dir
+              mountPath: /var/lib/kubelet/pods
+              mountPropagation: "Bidirectional"
+          resources:
+            limits:
+              memory: {{ .Values.node.resources.limits.memory }}
+            requests:
+              cpu: {{ .Values.node.resources.requests.cpu }}
+              memory: {{ .Values.node.resources.requests.memory }}
+      volumes:
+        - name: socket-dir
+          hostPath:
+            path: /var/lib/kubelet/plugins/webdav-csiplugin
+            type: DirectoryOrCreate
+        - name: pods-mount-dir
+          hostPath:
+            path: /var/lib/kubelet/pods
+            type: Directory
+        - hostPath:
+            path: /var/lib/kubelet/plugins_registry
+            type: Directory
+          name: registration-dir

helm/templates/rbac.yaml

@@ -0,0 +1,48 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: webdav-csi-sa
+  namespace: kube-system
+---
+kind: ClusterRole
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: webdav-csi-cr
+rules:
+  - apiGroups: [""]
+    resources: ["persistentvolumes"]
+    verbs: ["get", "list", "watch", "create", "delete"]
+  - apiGroups: [""]
+    resources: ["persistentvolumeclaims"]
+    verbs: ["get", "list", "watch", "update"]
+  - apiGroups: [""]
+    resources: ["secrets"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["storage.k8s.io"]
+    resources: ["storageclasses"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: [""]
+    resources: ["events"]
+    verbs: ["list", "watch", "create", "update", "patch"]
+  - apiGroups: ["storage.k8s.io"]
+    resources: ["csinodes"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: [""]
+    resources: ["nodes"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["coordination.k8s.io"]
+    resources: ["leases"]
+    verbs: ["get", "watch", "list", "delete", "update", "create"]
+---
+kind: ClusterRoleBinding
+apiVersion: rbac.authorization.k8s.io/v1
+metadata:
+  name: webdav-csi-crb
+subjects:
+  - kind: ServiceAccount
+    name: webdav-csi-sa
+    namespace: kube-system
+roleRef:
+  kind: ClusterRole
+  name: webdav-csi-cr
+  apiGroup: rbac.authorization.k8s.io

helm/values.yaml

@@ -0,0 +1,50 @@
+controller:
+  replicas: 1
+  image:
+    name: ghcr.io/ruakij/webdav-csi-driver
+    tag: v0.0.1
+    pullPolicy: IfNotPresent
+  resources:
+    limits:
+      memory: 200Mi
+    requests:
+      cpu: 10m
+      memory: 20Mi
+
+node:
+  image:
+    name: ghcr.io/ruakij/webdav-csi-driver
+    tag: v0.0.1
+    pullPolicy: IfNotPresent
+  resources:
+    limits:
+      memory: 300Mi
+    requests:
+      cpu: 10m
+      memory: 20Mi
+
+livenessProbe:
+  image:
+    name: registry.k8s.io/sig-storage/livenessprobe
+    tag: v2.11.0
+    pullPolicy: IfNotPresent
+
+csiProvisioner:
+  image:
+    name: registry.k8s.io/sig-storage/csi-provisioner
+    tag: v3.6.2
+    pullPolicy: IfNotPresent
+
+# Configuration for the default storage class
+defaultStorageClass: {}
+#  name: "webdav"
+#  parameters:
+#    # alist folder webdav address
+#    share: http://ip:port/dav/media 
+#    csi.storage.k8s.io/provisioner-secret-name: "webdav-secrect"
+#    csi.storage.k8s.io/provisioner-secret-namespace: "default"
+#    csi.storage.k8s.io/node-publish-secret-name: "webdav-secrect"
+#    csi.storage.k8s.io/node-publish-secret-namespace: "default"
+#  reclaimPolicy: "Delete"
+#  volumeBindingMode: Immediate
+#  mountOptions: {}

pkg/webdav/controller.go

@@ -0,0 +1,248 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"k8s.io/klog/v2"
+
+	"git.ruekov.eu/ruakij/webdav-csi-driver/pkg/webdav/mount"
+)
+
+type ControllerServer struct {
+	csi.UnimplementedControllerServer
+	*Driver
+	mounter mount.Interface
+}
+
+func NewControllerServer(d *Driver, mounter mount.Interface) *ControllerServer {
+	return &ControllerServer{
+		Driver:  d,
+		mounter: mounter,
+	}
+}
+
+// CreateVolume implements csi.ControllerServer.
+func (c *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error) {
+	name := req.GetName()
+	if len(name) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "CreateVolume name must be provided")
+	}
+	if err := isValidVolumeCapabilities(req.GetVolumeCapabilities()); err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	mountPermissions := c.Driver.mountPermissions
+	parameters := req.GetParameters()
+	if parameters == nil {
+		parameters = make(map[string]string)
+	}
+	for k, v := range parameters {
+		switch strings.ToLower(k) {
+		case webdavSharePath, pvcNameKey, pvcNamespaceKey, pvNameKey:
+		case mountPermissionsField:
+			if v != "" {
+				var err error
+				if mountPermissions, err = strconv.ParseUint(v, 8, 32); err != nil {
+					return nil, status.Errorf(codes.InvalidArgument, fmt.Sprintf("invalid mountPermissions %s in storage class", v))
+				}
+			}
+		default:
+			return nil, status.Errorf(codes.InvalidArgument, fmt.Sprintf("invalid parameter %q in storage class", k))
+		}
+	}
+
+	targetPath := c.workingMountDir
+	sourcePath := req.Parameters[webdavSharePath]
+	notMnt, err := c.mounter.IsLikelyNotMountPoint(targetPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			if err := os.MkdirAll(targetPath, 0750); err != nil {
+				return nil, status.Error(codes.Internal, err.Error())
+			}
+			notMnt = true
+		} else {
+			return nil, status.Error(codes.Internal, err.Error())
+		}
+	}
+	if !notMnt {
+		return nil, status.Errorf(codes.Internal, fmt.Sprintf("target path %s is alredy mounted", targetPath))
+	}
+
+	stdin := []string{req.GetSecrets()[secretUsernameKey], req.GetSecrets()[secretPasswordKey]}
+	if err := c.mounter.MountSensitiveWithStdin(sourcePath, targetPath, fstype, nil, nil, stdin); err != nil {
+		return nil, status.Errorf(codes.Internal, fmt.Sprintf("mount failed: %v", err.Error()))
+	}
+
+	internalVolumePath := filepath.Join(targetPath, req.Name)
+	if err = os.Mkdir(internalVolumePath, 0777); err != nil && !os.IsExist(err) {
+		return nil, status.Errorf(codes.Internal, "failed to make subdirectory: %v", err.Error())
+	}
+
+	defer func() {
+		if err = c.mounter.Unmount(targetPath); err != nil {
+			klog.Warningf("failed to unmount targetpath %s: %v", targetPath, err.Error())
+		}
+	}()
+
+	if mountPermissions > 0 {
+		// Reset directory permissions because of umask problems
+		if err = os.Chmod(internalVolumePath, os.FileMode(mountPermissions)); err != nil {
+			klog.Warningf("failed to chmod subdirectory: %v", err.Error())
+		}
+	}
+
+	return &csi.CreateVolumeResponse{
+		Volume: &csi.Volume{
+			VolumeId:      MakeVolumeId(sourcePath, req.Name),
+			CapacityBytes: 0, // by setting it to zero, Provisioner will use PVC requested size as PV size
+			VolumeContext: nil,
+			ContentSource: req.GetVolumeContentSource(),
+		},
+	}, nil
+
+}
+
+// DeleteVolume implements csi.ControllerServer.
+func (c *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error) {
+	volumeID := req.GetVolumeId()
+	if volumeID == "" {
+		return nil, status.Error(codes.InvalidArgument, "volume id is empty")
+	}
+	sourcePath, subDir, err := ParseVolumeId(volumeID)
+	if err != nil {
+		// An invalid ID should be treated as doesn't exist
+		klog.Warningf("failed to parse volume for volume id %v deletion: %v", volumeID, err)
+		return &csi.DeleteVolumeResponse{}, nil
+	}
+
+	stdin := []string{req.GetSecrets()[secretUsernameKey], req.GetSecrets()[secretPasswordKey]}
+	targetPath := c.workingMountDir
+	if err := c.mounter.MountSensitiveWithStdin(sourcePath, targetPath, fstype, nil, nil, stdin); err != nil {
+		return nil, status.Errorf(codes.Internal, fmt.Sprintf("mount failed: %v", err.Error()))
+	}
+
+	defer func() {
+		if err = c.mounter.Unmount(targetPath); err != nil {
+			klog.Warningf("failed to unmount targetpath %s: %v", targetPath, err.Error())
+		}
+	}()
+
+	internalVolumePath := filepath.Join(targetPath, subDir)
+	klog.V(2).Infof("Removing subdirectory at %v", internalVolumePath)
+	if err = os.RemoveAll(internalVolumePath); err != nil {
+		return nil, status.Errorf(codes.Internal, "failed to delete subdirectory: %v", err.Error())
+	}
+
+	return &csi.DeleteVolumeResponse{}, nil
+}
+
+// ValidateVolumeCapabilities implements csi.ControllerServer.
+func (c *ControllerServer) ValidateVolumeCapabilities(_ context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error) {
+	if len(req.GetVolumeId()) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
+	}
+	if err := isValidVolumeCapabilities(req.GetVolumeCapabilities()); err != nil {
+		return nil, status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	return &csi.ValidateVolumeCapabilitiesResponse{
+		Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
+			VolumeCapabilities: req.GetVolumeCapabilities(),
+		},
+		Message: "",
+	}, nil
+}
+
+// ControllerGetCapabilities implements csi.ControllerServer.
+func (c *ControllerServer) ControllerGetCapabilities(context.Context, *csi.ControllerGetCapabilitiesRequest) (*csi.ControllerGetCapabilitiesResponse, error) {
+	return &csi.ControllerGetCapabilitiesResponse{
+		Capabilities: c.Driver.cscap,
+	}, nil
+}
+
+// ControllerExpandVolume implements csi.ControllerServer.
+func (*ControllerServer) ControllerExpandVolume(context.Context, *csi.ControllerExpandVolumeRequest) (*csi.ControllerExpandVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ControllerGetVolume implements csi.ControllerServer.
+func (*ControllerServer) ControllerGetVolume(context.Context, *csi.ControllerGetVolumeRequest) (*csi.ControllerGetVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ControllerModifyVolume implements csi.ControllerServer.
+func (*ControllerServer) ControllerModifyVolume(context.Context, *csi.ControllerModifyVolumeRequest) (*csi.ControllerModifyVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ControllerPublishVolume implements csi.ControllerServer.
+func (*ControllerServer) ControllerPublishVolume(context.Context, *csi.ControllerPublishVolumeRequest) (*csi.ControllerPublishVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ControllerUnpublishVolume implements csi.ControllerServer.
+func (*ControllerServer) ControllerUnpublishVolume(context.Context, *csi.ControllerUnpublishVolumeRequest) (*csi.ControllerUnpublishVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// CreateSnapshot implements csi.ControllerServer.
+func (*ControllerServer) CreateSnapshot(context.Context, *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// DeleteSnapshot implements csi.ControllerServer.
+func (*ControllerServer) DeleteSnapshot(context.Context, *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// GetCapacity implements csi.ControllerServer.
+func (*ControllerServer) GetCapacity(context.Context, *csi.GetCapacityRequest) (*csi.GetCapacityResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ListSnapshots implements csi.ControllerServer.
+func (*ControllerServer) ListSnapshots(context.Context, *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// ListVolumes implements csi.ControllerServer.
+func (*ControllerServer) ListVolumes(context.Context, *csi.ListVolumesRequest) (*csi.ListVolumesResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// isValidVolumeCapabilities validates the given VolumeCapability array is valid
+func isValidVolumeCapabilities(volCaps []*csi.VolumeCapability) error {
+	if len(volCaps) == 0 {
+		return fmt.Errorf("volume capabilities missing in request")
+	}
+	for _, c := range volCaps {
+		if c.GetBlock() != nil {
+			return fmt.Errorf("block volume capability not supported")
+		}
+	}
+	return nil
+}

pkg/webdav/driver.go

@@ -0,0 +1,122 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"git.ruekov.eu/ruakij/webdav-csi-driver/pkg/webdav/mount"
+	"github.com/container-storage-interface/spec/lib/go/csi"
+
+	"k8s.io/klog/v2"
+)
+
+const (
+	DefaultDriverName     = "webdav.csi.io"
+	fstype                = "davfs"
+	webdavSharePath       = "share"
+	mountPermissionsField = "mountpermissions"
+	pvcNameKey            = "csi.storage.k8s.io/pvc/name"
+	pvcNamespaceKey       = "csi.storage.k8s.io/pvc/namespace"
+	pvNameKey             = "csi.storage.k8s.io/pv/name"
+	secretUsernameKey     = "username"
+	secretPasswordKey     = "password"
+)
+
+type Driver struct {
+	name                  string
+	nodeID                string
+	endpoint              string
+	version               string
+	mountPermissions      uint64
+	workingMountDir       string
+	defaultOnDeletePolicy string
+
+	cscap []*csi.ControllerServiceCapability
+	nscap []*csi.NodeServiceCapability
+}
+
+type DriverOpt struct {
+	Name                  string
+	NodeID                string
+	Endpoint              string
+	MountPermissions      uint64
+	WorkingMountDir       string
+	DefaultOnDeletePolicy string
+}
+
+func NewDriver(opt *DriverOpt) *Driver {
+	klog.V(2).Infof("Driver: %v version: %v", opt.Name, driverVersion)
+
+	driverName := opt.Name
+	if driverName == "" {
+		driverName = DefaultDriverName
+	}
+
+	driver := &Driver{
+		name:                  driverName,
+		nodeID:                opt.NodeID,
+		endpoint:              opt.Endpoint,
+		mountPermissions:      opt.MountPermissions,
+		workingMountDir:       opt.WorkingMountDir,
+		defaultOnDeletePolicy: opt.DefaultOnDeletePolicy,
+		version:               driverName,
+	}
+
+	driver.AddControllerServiceCapabilities([]csi.ControllerServiceCapability_RPC_Type{
+		csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
+		csi.ControllerServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER,
+	})
+
+	driver.AddNodeServiceCapabilities([]csi.NodeServiceCapability_RPC_Type{
+		csi.NodeServiceCapability_RPC_SINGLE_NODE_MULTI_WRITER,
+		csi.NodeServiceCapability_RPC_UNKNOWN,
+	})
+
+	return driver
+}
+
+func (d *Driver) Run() {
+	versionMeta, err := GetVersionYAML(d.name)
+	if err != nil {
+		klog.Fatalf("%v", err)
+	}
+	klog.V(2).Infof("\nDRIVER INFORMATION:\n-------------------\n%s\n\nStreaming logs below:", versionMeta)
+
+	mounter := mount.New("")
+	server := NewNonBlockingGRPCServer()
+	server.Start(d.endpoint,
+		NewIdentityServer(d),
+		NewControllerServer(d, mounter),
+		NewNodeServer(d, mounter),
+	)
+	server.Wait()
+}
+
+func (d *Driver) AddControllerServiceCapabilities(cl []csi.ControllerServiceCapability_RPC_Type) {
+	var csc []*csi.ControllerServiceCapability
+	for _, c := range cl {
+		csc = append(csc, NewControllerServiceCapability(c))
+	}
+	d.cscap = csc
+}
+
+func (d *Driver) AddNodeServiceCapabilities(nl []csi.NodeServiceCapability_RPC_Type) {
+	var nsc []*csi.NodeServiceCapability
+	for _, n := range nl {
+		nsc = append(nsc, NewNodeServiceCapability(n))
+	}
+	d.nscap = nsc
+}

pkg/webdav/identity.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"context"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+)
+
+type IdentityServer struct {
+	csi.UnimplementedIdentityServer
+	Driver *Driver
+}
+
+func NewIdentityServer(d *Driver) *IdentityServer {
+	return &IdentityServer{
+		Driver: d,
+	}
+}
+
+func (ids *IdentityServer) GetPluginInfo(_ context.Context, _ *csi.GetPluginInfoRequest) (*csi.GetPluginInfoResponse, error) {
+	if ids.Driver.name == "" {
+		return nil, status.Error(codes.Unavailable, "Driver name not configured")
+	}
+
+	if ids.Driver.version == "" {
+		return nil, status.Error(codes.Unavailable, "Driver is missing version")
+	}
+
+	return &csi.GetPluginInfoResponse{
+		Name:          ids.Driver.name,
+		VendorVersion: ids.Driver.version,
+	}, nil
+}
+
+func (ids *IdentityServer) Probe(_ context.Context, _ *csi.ProbeRequest) (*csi.ProbeResponse, error) {
+	return &csi.ProbeResponse{Ready: &wrapperspb.BoolValue{Value: true}}, nil
+}
+
+func (ids *IdentityServer) GetPluginCapabilities(_ context.Context, _ *csi.GetPluginCapabilitiesRequest) (*csi.GetPluginCapabilitiesResponse, error) {
+	return &csi.GetPluginCapabilitiesResponse{
+		Capabilities: []*csi.PluginCapability{
+			{
+				Type: &csi.PluginCapability_Service_{
+					Service: &csi.PluginCapability_Service{
+						Type: csi.PluginCapability_Service_CONTROLLER_SERVICE,
+					},
+				},
+			},
+		},
+	}, nil
+}

pkg/webdav/mount/mount.go

@@ -0,0 +1,405 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// TODO(thockin): This whole pkg is pretty linux-centric.  As soon as we have
+// an alternate platform, we will need to abstract further.
+
+package mount
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+	"time"
+
+	utilexec "k8s.io/utils/exec"
+)
+
+const (
+	// Default mount command if mounter path is not specified.
+	defaultMountCommand = "mount"
+	// Log message where sensitive mount options were removed
+	sensitiveOptionsRemoved = "<masked>"
+)
+
+// Interface defines the set of methods to allow for mount operations on a system.
+type Interface interface {
+	// Mount mounts source to target as fstype with given options.
+	// options MUST not contain sensitive material (like passwords).
+	Mount(source string, target string, fstype string, options []string) error
+	// MountSensitive is the same as Mount() but this method allows
+	// sensitiveOptions to be passed in a separate parameter from the normal
+	// mount options and ensures the sensitiveOptions are never logged. This
+	// method should be used by callers that pass sensitive material (like
+	// passwords) as mount options.
+	MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error
+	// MountSensitiveWithStdin
+	MountSensitiveWithStdin(source string, target string, fstype string, options []string, sensitiveOptions []string, stdin []string) error
+	// MountSensitiveWithoutSystemd is the same as MountSensitive() but this method disable using systemd mount.
+	MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []string) error
+	// MountSensitiveWithoutSystemdWithMountFlags is the same as MountSensitiveWithoutSystemd() with additional mount flags
+	MountSensitiveWithoutSystemdWithMountFlags(source string, target string, fstype string, options []string, sensitiveOptions []string, mountFlags []string) error
+	// Unmount unmounts given target.
+	Unmount(target string) error
+	// List returns a list of all mounted filesystems.  This can be large.
+	// On some platforms, reading mounts directly from the OS is not guaranteed
+	// consistent (i.e. it could change between chunked reads). This is guaranteed
+	// to be consistent.
+	List() ([]MountPoint, error)
+	// IsLikelyNotMountPoint uses heuristics to determine if a directory
+	// is not a mountpoint.
+	// It should return ErrNotExist when the directory does not exist.
+	// IsLikelyNotMountPoint does NOT properly detect all mountpoint types
+	// most notably linux bind mounts and symbolic link. For callers that do not
+	// care about such situations, this is a faster alternative to calling List()
+	// and scanning that output.
+	IsLikelyNotMountPoint(file string) (bool, error)
+	// CanSafelySkipMountPointCheck indicates whether this mounter returns errors on
+	// operations for targets that are not mount points. If this returns true, no such
+	// errors will be returned.
+	CanSafelySkipMountPointCheck() bool
+	// IsMountPoint determines if a directory is a mountpoint.
+	// It should return ErrNotExist when the directory does not exist.
+	// IsMountPoint is more expensive than IsLikelyNotMountPoint.
+	// IsMountPoint detects bind mounts in linux.
+	// IsMountPoint may enumerate all the mountpoints using List() and
+	// the list of mountpoints may be large, then it uses
+	// isMountPointMatch to evaluate whether the directory is a mountpoint.
+	IsMountPoint(file string) (bool, error)
+	// GetMountRefs finds all mount references to pathname, returning a slice of
+	// paths. Pathname can be a mountpoint path or a normal	directory
+	// (for bind mount). On Linux, pathname is excluded from the slice.
+	// For example, if /dev/sdc was mounted at /path/a and /path/b,
+	// GetMountRefs("/path/a") would return ["/path/b"]
+	// GetMountRefs("/path/b") would return ["/path/a"]
+	// On Windows there is no way to query all mount points; as long as pathname is
+	// a valid mount, it will be returned.
+	GetMountRefs(pathname string) ([]string, error)
+}
+
+// Compile-time check to ensure all Mounter implementations satisfy
+// the mount interface.
+var _ Interface = &Mounter{}
+
+type MounterForceUnmounter interface {
+	Interface
+	// UnmountWithForce unmounts given target but will retry unmounting with force option
+	// after given timeout.
+	UnmountWithForce(target string, umountTimeout time.Duration) error
+}
+
+// MountPoint represents a single line in /proc/mounts or /etc/fstab.
+type MountPoint struct { // nolint: golint
+	Device string
+	Path   string
+	Type   string
+	Opts   []string // Opts may contain sensitive mount options (like passwords) and MUST be treated as such (e.g. not logged).
+	Freq   int
+	Pass   int
+}
+
+type MountErrorType string // nolint: golint
+
+const (
+	FilesystemMismatch  MountErrorType = "FilesystemMismatch"
+	HasFilesystemErrors MountErrorType = "HasFilesystemErrors"
+	UnformattedReadOnly MountErrorType = "UnformattedReadOnly"
+	FormatFailed        MountErrorType = "FormatFailed"
+	GetDiskFormatFailed MountErrorType = "GetDiskFormatFailed"
+	UnknownMountError   MountErrorType = "UnknownMountError"
+)
+
+type MountError struct { // nolint: golint
+	Type    MountErrorType
+	Message string
+}
+
+func (mountError MountError) String() string {
+	return mountError.Message
+}
+
+func (mountError MountError) Error() string {
+	return mountError.Message
+}
+
+func NewMountError(mountErrorValue MountErrorType, format string, args ...interface{}) error {
+	mountError := MountError{
+		Type:    mountErrorValue,
+		Message: fmt.Sprintf(format, args...),
+	}
+	return mountError
+}
+
+// SafeFormatAndMount probes a device to see if it is formatted.
+// Namely it checks to see if a file system is present. If so it
+// mounts it otherwise the device is formatted first then mounted.
+type SafeFormatAndMount struct {
+	Interface
+	Exec utilexec.Interface
+
+	formatSem     chan any
+	formatTimeout time.Duration
+}
+
+func NewSafeFormatAndMount(mounter Interface, exec utilexec.Interface, opts ...Option) *SafeFormatAndMount {
+	res := &SafeFormatAndMount{
+		Interface: mounter,
+		Exec:      exec,
+	}
+	for _, opt := range opts {
+		opt(res)
+	}
+	return res
+}
+
+type Option func(*SafeFormatAndMount)
+
+// WithMaxConcurrentFormat sets the maximum number of concurrent format
+// operations executed by the mounter. The timeout controls the maximum
+// duration of a format operation before its concurrency token is released.
+// Once a token is released, it can be acquired by another concurrent format
+// operation. The original operation is allowed to complete.
+// If n < 1, concurrency is set to unlimited.
+func WithMaxConcurrentFormat(n int, timeout time.Duration) Option {
+	return func(mounter *SafeFormatAndMount) {
+		if n > 0 {
+			mounter.formatSem = make(chan any, n)
+			mounter.formatTimeout = timeout
+		}
+	}
+}
+
+// FormatAndMount formats the given disk, if needed, and mounts it.
+// That is if the disk is not formatted and it is not being mounted as
+// read-only it will format it first then mount it. Otherwise, if the
+// disk is already formatted or it is being mounted as read-only, it
+// will be mounted without formatting.
+// options MUST not contain sensitive material (like passwords).
+func (mounter *SafeFormatAndMount) FormatAndMount(source string, target string, fstype string, options []string) error {
+	return mounter.FormatAndMountSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
+}
+
+// FormatAndMountSensitive is the same as FormatAndMount but this method allows
+// sensitiveOptions to be passed in a separate parameter from the normal mount
+// options and ensures the sensitiveOptions are never logged. This method should
+// be used by callers that pass sensitive material (like passwords) as mount
+// options.
+func (mounter *SafeFormatAndMount) FormatAndMountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
+	return mounter.FormatAndMountSensitiveWithFormatOptions(source, target, fstype, options, sensitiveOptions, nil /* formatOptions */)
+}
+
+// FormatAndMountSensitiveWithFormatOptions behaves exactly the same as
+// FormatAndMountSensitive, but allows for options to be passed when the disk
+// is formatted. These options are NOT validated in any way and should never
+// come directly from untrusted user input as that would be an injection risk.
+func (mounter *SafeFormatAndMount) FormatAndMountSensitiveWithFormatOptions(source string, target string, fstype string, options []string, sensitiveOptions []string, formatOptions []string) error {
+	return mounter.formatAndMountSensitive(source, target, fstype, options, sensitiveOptions, formatOptions)
+}
+
+// getMountRefsByDev finds all references to the device provided
+// by mountPath; returns a list of paths.
+// Note that mountPath should be path after the evaluation of any symblolic links.
+//
+//lint:ignore U1000 Ignore unused function temporarily for debugging
+func getMountRefsByDev(mounter Interface, mountPath string) ([]string, error) {
+	mps, err := mounter.List()
+	if err != nil {
+		return nil, err
+	}
+
+	// Finding the device mounted to mountPath.
+	diskDev := ""
+	for i := range mps {
+		if mountPath == mps[i].Path {
+			diskDev = mps[i].Device
+			break
+		}
+	}
+
+	// Find all references to the device.
+	var refs []string
+	for i := range mps {
+		if mps[i].Device == diskDev || mps[i].Device == mountPath {
+			if mps[i].Path != mountPath {
+				refs = append(refs, mps[i].Path)
+			}
+		}
+	}
+	return refs, nil
+}
+
+// IsNotMountPoint determines if a directory is a mountpoint.
+// It should return ErrNotExist when the directory does not exist.
+// IsNotMountPoint is more expensive than IsLikelyNotMountPoint
+// and depends on IsMountPoint.
+//
+// If an error occurs, it returns true (assuming it is not a mountpoint)
+// when ErrNotExist is returned for callers similar to IsLikelyNotMountPoint.
+//
+// Deprecated: This function is kept to keep changes backward compatible with
+// previous library version. Callers should prefer mounter.IsMountPoint.
+func IsNotMountPoint(mounter Interface, file string) (bool, error) {
+	isMnt, err := mounter.IsMountPoint(file)
+	if err != nil {
+		return true, err
+	}
+	return !isMnt, nil
+}
+
+// GetDeviceNameFromMount given a mnt point, find the device from /proc/mounts
+// returns the device name, reference count, and error code.
+func GetDeviceNameFromMount(mounter Interface, mountPath string) (string, int, error) {
+	mps, err := mounter.List()
+	if err != nil {
+		return "", 0, err
+	}
+
+	// Find the device name.
+	// FIXME if multiple devices mounted on the same mount path, only the first one is returned.
+	device := ""
+	// If mountPath is symlink, need get its target path.
+	slTarget, err := filepath.EvalSymlinks(mountPath)
+	if err != nil {
+		slTarget = mountPath
+	}
+	for i := range mps {
+		if mps[i].Path == slTarget {
+			device = mps[i].Device
+			break
+		}
+	}
+
+	// Find all references to the device.
+	refCount := 0
+	for i := range mps {
+		if mps[i].Device == device {
+			refCount++
+		}
+	}
+	return device, refCount, nil
+}
+
+// MakeBindOpts detects whether a bind mount is being requested and makes the remount options to
+// use in case of bind mount, due to the fact that bind mount doesn't respect mount options.
+// The list equals:
+//
+//	options - 'bind' + 'remount' (no duplicate)
+func MakeBindOpts(options []string) (bool, []string, []string) {
+	bind, bindOpts, bindRemountOpts, _ := MakeBindOptsSensitive(options, nil /* sensitiveOptions */)
+	return bind, bindOpts, bindRemountOpts
+}
+
+// MakeBindOptsSensitive is the same as MakeBindOpts but this method allows
+// sensitiveOptions to be passed in a separate parameter from the normal mount
+// options and ensures the sensitiveOptions are never logged. This method should
+// be used by callers that pass sensitive material (like passwords) as mount
+// options.
+func MakeBindOptsSensitive(options []string, sensitiveOptions []string) (bool, []string, []string, []string) {
+	// Because we have an FD opened on the subpath bind mount, the "bind" option
+	// needs to be included, otherwise the mount target will error as busy if you
+	// remount as readonly.
+	//
+	// As a consequence, all read only bind mounts will no longer change the underlying
+	// volume mount to be read only.
+	bindRemountOpts := []string{"bind", "remount"}
+	bindRemountSensitiveOpts := []string{}
+	bind := false
+	bindOpts := []string{"bind"}
+
+	// _netdev is a userspace mount option and does not automatically get added when
+	// bind mount is created and hence we must carry it over.
+	if checkForNetDev(options, sensitiveOptions) {
+		bindOpts = append(bindOpts, "_netdev")
+	}
+
+	for _, option := range options {
+		switch option {
+		case "bind":
+			bind = true
+		case "remount":
+		default:
+			bindRemountOpts = append(bindRemountOpts, option)
+		}
+	}
+
+	for _, sensitiveOption := range sensitiveOptions {
+		switch sensitiveOption {
+		case "bind":
+			bind = true
+		case "remount":
+		default:
+			bindRemountSensitiveOpts = append(bindRemountSensitiveOpts, sensitiveOption)
+		}
+	}
+
+	return bind, bindOpts, bindRemountOpts, bindRemountSensitiveOpts
+}
+
+func checkForNetDev(options []string, sensitiveOptions []string) bool {
+	for _, option := range options {
+		if option == "_netdev" {
+			return true
+		}
+	}
+	for _, sensitiveOption := range sensitiveOptions {
+		if sensitiveOption == "_netdev" {
+			return true
+		}
+	}
+	return false
+}
+
+// PathWithinBase checks if give path is within given base directory.
+func PathWithinBase(fullPath, basePath string) bool {
+	rel, err := filepath.Rel(basePath, fullPath)
+	if err != nil {
+		return false
+	}
+	if StartsWithBackstep(rel) {
+		// Needed to escape the base path.
+		return false
+	}
+	return true
+}
+
+// StartsWithBackstep checks if the given path starts with a backstep segment.
+func StartsWithBackstep(rel string) bool {
+	// normalize to / and check for ../
+	return rel == ".." || strings.HasPrefix(filepath.ToSlash(rel), "../")
+}
+
+// sanitizedOptionsForLogging will return a comma separated string containing
+// options and sensitiveOptions. Each entry in sensitiveOptions will be
+// replaced with the string sensitiveOptionsRemoved
+// e.g. o1,o2,<masked>,<masked>
+func sanitizedOptionsForLogging(options []string, sensitiveOptions []string) string {
+	separator := ""
+	if len(options) > 0 && len(sensitiveOptions) > 0 {
+		separator = ","
+	}
+
+	sensitiveOptionsStart := ""
+	sensitiveOptionsEnd := ""
+	if len(sensitiveOptions) > 0 {
+		sensitiveOptionsStart = strings.Repeat(sensitiveOptionsRemoved+",", len(sensitiveOptions)-1)
+		sensitiveOptionsEnd = sensitiveOptionsRemoved
+	}
+
+	return strings.Join(options, ",") +
+		separator +
+		sensitiveOptionsStart +
+		sensitiveOptionsEnd
+}

pkg/webdav/mount/mount_helper_common.go

@@ -0,0 +1,157 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package mount
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"k8s.io/klog/v2"
+)
+
+// CleanupMountPoint unmounts the given path and deletes the remaining directory
+// if successful. If extensiveMountPointCheck is true IsNotMountPoint will be
+// called instead of IsLikelyNotMountPoint. IsNotMountPoint is more expensive
+// but properly handles bind mounts within the same fs.
+func CleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool) error {
+	pathExists, pathErr := PathExists(mountPath)
+	if !pathExists && pathErr == nil {
+		klog.Warningf("Warning: mount cleanup skipped because path does not exist: %v", mountPath)
+		return nil
+	}
+	corruptedMnt := IsCorruptedMnt(pathErr)
+	if pathErr != nil && !corruptedMnt {
+		return fmt.Errorf("Error checking path: %v", pathErr)
+	}
+	return doCleanupMountPoint(mountPath, mounter, extensiveMountPointCheck, corruptedMnt)
+}
+
+func CleanupMountWithForce(mountPath string, mounter MounterForceUnmounter, extensiveMountPointCheck bool, umountTimeout time.Duration) error {
+	pathExists, pathErr := PathExists(mountPath)
+	if !pathExists && pathErr == nil {
+		klog.Warningf("Warning: mount cleanup skipped because path does not exist: %v", mountPath)
+		return nil
+	}
+	corruptedMnt := IsCorruptedMnt(pathErr)
+	if pathErr != nil && !corruptedMnt {
+		return fmt.Errorf("Error checking path: %v", pathErr)
+	}
+
+	if corruptedMnt || mounter.CanSafelySkipMountPointCheck() {
+		klog.V(4).Infof("unmounting %q (corruptedMount: %t, mounterCanSkipMountPointChecks: %t)",
+			mountPath, corruptedMnt, mounter.CanSafelySkipMountPointCheck())
+		if err := mounter.UnmountWithForce(mountPath, umountTimeout); err != nil {
+			return err
+		}
+		return removePath(mountPath)
+	}
+
+	notMnt, err := removePathIfNotMountPoint(mountPath, mounter, extensiveMountPointCheck)
+	// if mountPath is not a mount point, it's just been removed or there was an error
+	if err != nil || notMnt {
+		return err
+	}
+
+	klog.V(4).Infof("%q is a mountpoint, unmounting", mountPath)
+	if err := mounter.UnmountWithForce(mountPath, umountTimeout); err != nil {
+		return err
+	}
+
+	notMnt, err = removePathIfNotMountPoint(mountPath, mounter, extensiveMountPointCheck)
+	// if mountPath is not a mount point, it's either just been removed or there was an error
+	if notMnt {
+		return err
+	}
+	// mountPath is still a mount point
+	return fmt.Errorf("failed to cleanup mount point %v", mountPath)
+}
+
+// doCleanupMountPoint unmounts the given path and
+// deletes the remaining directory if successful.
+// if extensiveMountPointCheck is true
+// IsNotMountPoint will be called instead of IsLikelyNotMountPoint.
+// IsNotMountPoint is more expensive but properly handles bind mounts within the same fs.
+// if corruptedMnt is true, it means that the mountPath is a corrupted mountpoint, and the mount point check
+// will be skipped. The mount point check will also be skipped if the mounter supports it.
+func doCleanupMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool, corruptedMnt bool) error {
+	if corruptedMnt || mounter.CanSafelySkipMountPointCheck() {
+		klog.V(4).Infof("unmounting %q (corruptedMount: %t, mounterCanSkipMountPointChecks: %t)",
+			mountPath, corruptedMnt, mounter.CanSafelySkipMountPointCheck())
+		if err := mounter.Unmount(mountPath); err != nil {
+			return err
+		}
+		return removePath(mountPath)
+	}
+
+	notMnt, err := removePathIfNotMountPoint(mountPath, mounter, extensiveMountPointCheck)
+	// if mountPath is not a mount point, it's just been removed or there was an error
+	if err != nil || notMnt {
+		return err
+	}
+
+	klog.V(4).Infof("%q is a mountpoint, unmounting", mountPath)
+	if err := mounter.Unmount(mountPath); err != nil {
+		return err
+	}
+
+	notMnt, err = removePathIfNotMountPoint(mountPath, mounter, extensiveMountPointCheck)
+	// if mountPath is not a mount point, it's either just been removed or there was an error
+	if notMnt {
+		return err
+	}
+	// mountPath is still a mount point
+	return fmt.Errorf("failed to cleanup mount point %v", mountPath)
+}
+
+// removePathIfNotMountPoint verifies if given mountPath is a mount point if not it attempts
+// to remove the directory. Returns true and nil if directory was not a mount point and removed.
+func removePathIfNotMountPoint(mountPath string, mounter Interface, extensiveMountPointCheck bool) (bool, error) {
+	var notMnt bool
+	var err error
+
+	if extensiveMountPointCheck {
+		notMnt, err = IsNotMountPoint(mounter, mountPath)
+	} else {
+		notMnt, err = mounter.IsLikelyNotMountPoint(mountPath)
+	}
+
+	if err != nil {
+		if os.IsNotExist(err) {
+			klog.V(4).Infof("%q does not exist", mountPath)
+			return true, nil
+		}
+		return notMnt, err
+	}
+
+	if notMnt {
+		klog.Warningf("Warning: %q is not a mountpoint, deleting", mountPath)
+		return notMnt, os.Remove(mountPath)
+	}
+	return notMnt, nil
+}
+
+// removePath attempts to remove the directory. Returns nil if the directory was removed or does not exist.
+func removePath(mountPath string) error {
+	klog.V(4).Infof("Warning: deleting path %q", mountPath)
+	err := os.Remove(mountPath)
+	if os.IsNotExist(err) {
+		klog.V(4).Infof("%q does not exist", mountPath)
+		return nil
+	}
+	return err
+}

pkg/webdav/mount/mount_helper_unix.go

@@ -0,0 +1,250 @@
+//go:build !windows
+// +build !windows
+
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package mount
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+	"k8s.io/klog/v2"
+	utilio "k8s.io/utils/io"
+)
+
+const (
+	// At least number of fields per line in /proc/<pid>/mountinfo.
+	expectedAtLeastNumFieldsPerMountInfo = 10
+	// How many times to retry for a consistent read of /proc/mounts.
+	maxListTries = 10
+)
+
+// IsCorruptedMnt return true if err is about corrupted mount point
+func IsCorruptedMnt(err error) bool {
+	if err == nil {
+		return false
+	}
+	var underlyingError error
+	switch pe := err.(type) {
+	case nil:
+		return false
+	case *os.PathError:
+		underlyingError = pe.Err
+	case *os.LinkError:
+		underlyingError = pe.Err
+	case *os.SyscallError:
+		underlyingError = pe.Err
+	case syscall.Errno:
+		underlyingError = err
+	}
+
+	return underlyingError == syscall.ENOTCONN || underlyingError == syscall.ESTALE || underlyingError == syscall.EIO || underlyingError == syscall.EACCES || underlyingError == syscall.EHOSTDOWN
+}
+
+// MountInfo represents a single line in /proc/<pid>/mountinfo.
+type MountInfo struct { // nolint: golint
+	// Unique ID for the mount (maybe reused after umount).
+	ID int
+	// The ID of the parent mount (or of self for the root of this mount namespace's mount tree).
+	ParentID int
+	// Major indicates one half of the device ID which identifies the device class
+	// (parsed from `st_dev` for files on this filesystem).
+	Major int
+	// Minor indicates one half of the device ID which identifies a specific
+	// instance of device (parsed from `st_dev` for files on this filesystem).
+	Minor int
+	// The pathname of the directory in the filesystem which forms the root of this mount.
+	Root string
+	// Mount source, filesystem-specific information. e.g. device, tmpfs name.
+	Source string
+	// Mount point, the pathname of the mount point.
+	MountPoint string
+	// Optional fieds, zero or more fields of the form "tag[:value]".
+	OptionalFields []string
+	// The filesystem type in the form "type[.subtype]".
+	FsType string
+	// Per-mount options.
+	MountOptions []string
+	// Per-superblock options.
+	SuperOptions []string
+}
+
+// ParseMountInfo parses /proc/xxx/mountinfo.
+func ParseMountInfo(filename string) ([]MountInfo, error) {
+	content, err := readMountInfo(filename)
+	if err != nil {
+		return []MountInfo{}, err
+	}
+	contentStr := string(content)
+	infos := []MountInfo{}
+
+	for _, line := range strings.Split(contentStr, "\n") {
+		if line == "" {
+			// the last split() item is empty string following the last \n
+			continue
+		}
+		// See `man proc` for authoritative description of format of the file.
+		fields := strings.Fields(line)
+		if len(fields) < expectedAtLeastNumFieldsPerMountInfo {
+			return nil, fmt.Errorf("wrong number of fields in (expected at least %d, got %d): %s", expectedAtLeastNumFieldsPerMountInfo, len(fields), line)
+		}
+		id, err := strconv.Atoi(fields[0])
+		if err != nil {
+			return nil, err
+		}
+		parentID, err := strconv.Atoi(fields[1])
+		if err != nil {
+			return nil, err
+		}
+		mm := strings.Split(fields[2], ":")
+		if len(mm) != 2 {
+			return nil, fmt.Errorf("parsing '%s' failed: unexpected minor:major pair %s", line, mm)
+		}
+		major, err := strconv.Atoi(mm[0])
+		if err != nil {
+			return nil, fmt.Errorf("parsing '%s' failed: unable to parse major device id, err:%v", mm[0], err)
+		}
+		minor, err := strconv.Atoi(mm[1])
+		if err != nil {
+			return nil, fmt.Errorf("parsing '%s' failed: unable to parse minor device id, err:%v", mm[1], err)
+		}
+
+		info := MountInfo{
+			ID:           id,
+			ParentID:     parentID,
+			Major:        major,
+			Minor:        minor,
+			Root:         fields[3],
+			MountPoint:   fields[4],
+			MountOptions: splitMountOptions(fields[5]),
+		}
+		// All fields until "-" are "optional fields".
+		i := 6
+		for ; i < len(fields) && fields[i] != "-"; i++ {
+			info.OptionalFields = append(info.OptionalFields, fields[i])
+		}
+		// Parse the rest 3 fields.
+		i++
+		if len(fields)-i < 3 {
+			return nil, fmt.Errorf("expect 3 fields in %s, got %d", line, len(fields)-i)
+		}
+		info.FsType = fields[i]
+		info.Source = fields[i+1]
+		info.SuperOptions = splitMountOptions(fields[i+2])
+		infos = append(infos, info)
+	}
+	return infos, nil
+}
+
+// splitMountOptions parses comma-separated list of mount options into an array.
+// It respects double quotes - commas in them are not considered as the option separator.
+func splitMountOptions(s string) []string {
+	inQuotes := false
+	list := strings.FieldsFunc(s, func(r rune) bool {
+		if r == '"' {
+			inQuotes = !inQuotes
+		}
+		// Report a new field only when outside of double quotes.
+		return r == ',' && !inQuotes
+	})
+	return list
+}
+
+// isMountPointMatch returns true if the path in mp is the same as dir.
+// Handles case where mountpoint dir has been renamed due to stale NFS mount.
+func isMountPointMatch(mp MountPoint, dir string) bool {
+	return strings.TrimSuffix(mp.Path, "\\040(deleted)") == dir
+}
+
+// PathExists returns true if the specified path exists.
+// TODO: clean this up to use pkg/util/file/FileExists
+func PathExists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	} else if errors.Is(err, fs.ErrNotExist) {
+		err = syscall.Access(path, syscall.F_OK)
+		if err == nil {
+			// The access syscall says the file exists, the stat syscall says it
+			// doesn't. This was observed on CIFS when the path was removed at
+			// the server somehow. POSIX calls this a stale file handle, let's fake
+			// that error and treat the path as existing but corrupted.
+			klog.Warningf("Potential stale file handle detected: %s", path)
+			return true, syscall.ESTALE
+		}
+		return false, nil
+	} else if IsCorruptedMnt(err) {
+		return true, err
+	}
+	return false, err
+}
+
+// These variables are used solely by kernelHasMountinfoBug.
+var (
+	hasMountinfoBug       bool
+	checkMountinfoBugOnce sync.Once
+)
+
+// kernelHasMountinfoBug checks if the kernel bug that can lead to incomplete
+// mountinfo being read is fixed. It does so by checking the kernel version.
+//
+// The bug was fixed by the kernel commit 9f6c61f96f2d97 (since Linux 5.8).
+// Alas, there is no better way to check if the bug is fixed other than to
+// rely on the kernel version returned by uname.
+func kernelHasMountinfoBug() bool {
+	checkMountinfoBugOnce.Do(func() {
+		// Assume old kernel.
+		hasMountinfoBug = true
+
+		uname := unix.Utsname{}
+		err := unix.Uname(&uname)
+		if err != nil {
+			return
+		}
+
+		end := bytes.IndexByte(uname.Release[:], 0)
+		v := bytes.SplitN(uname.Release[:end], []byte{'.'}, 3)
+		if len(v) != 3 {
+			return
+		}
+		major, _ := strconv.Atoi(string(v[0]))
+		minor, _ := strconv.Atoi(string(v[1]))
+
+		if major > 5 || (major == 5 && minor >= 8) {
+			hasMountinfoBug = false
+		}
+	})
+
+	return hasMountinfoBug
+}
+
+func readMountInfo(path string) ([]byte, error) {
+	if kernelHasMountinfoBug() {
+		return utilio.ConsistentRead(path, maxListTries)
+	}
+
+	return os.ReadFile(path)
+}

pkg/webdav/mount/mount_linux.go

@@ -0,0 +1,871 @@
+//go:build linux
+// +build linux
+
+/*
+Copyright 2014 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package mount
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	"github.com/moby/sys/mountinfo"
+
+	"k8s.io/klog/v2"
+	utilexec "k8s.io/utils/exec"
+)
+
+const (
+	// Number of fields per line in /proc/mounts as per the fstab man page.
+	expectedNumFieldsPerLine = 6
+	// Location of the mount file to use
+	procMountsPath = "/proc/mounts"
+	// Location of the mountinfo file
+	procMountInfoPath = "/proc/self/mountinfo"
+	// 'fsck' found errors and corrected them
+	fsckErrorsCorrected = 1
+	// 'fsck' found errors but exited without correcting them
+	fsckErrorsUncorrected = 4
+	// Error thrown by exec cmd.Run() when process spawned by cmd.Start() completes before cmd.Wait() is called (see - k/k issue #103753)
+	errNoChildProcesses = "wait: no child processes"
+	// Error returned by some `umount` implementations when the specified path is not a mount point
+	errNotMounted = "not mounted"
+)
+
+// Mounter provides the default implementation of mount.Interface
+// for the linux platform.  This implementation assumes that the
+// kubelet is running in the host's root mount namespace.
+type Mounter struct {
+	mounterPath                string
+	withSystemd                *bool
+	trySystemd                 bool
+	withSafeNotMountedBehavior bool
+}
+
+var _ MounterForceUnmounter = &Mounter{}
+
+// New returns a mount.Interface for the current system.
+// It provides options to override the default mounter behavior.
+// mounterPath allows using an alternative to `/bin/mount` for mounting.
+func New(mounterPath string) Interface {
+	return &Mounter{
+		mounterPath:                mounterPath,
+		trySystemd:                 true,
+		withSafeNotMountedBehavior: detectSafeNotMountedBehavior(),
+	}
+}
+
+// NewWithoutSystemd returns a Linux specific mount.Interface for the current
+// system. It provides options to override the default mounter behavior.
+// mounterPath allows using an alternative to `/bin/mount` for mounting. Any
+// detection for systemd functionality is disabled with this Mounter.
+func NewWithoutSystemd(mounterPath string) Interface {
+	return &Mounter{
+		mounterPath:                mounterPath,
+		trySystemd:                 false,
+		withSafeNotMountedBehavior: detectSafeNotMountedBehavior(),
+	}
+}
+
+// hasSystemd validates that the withSystemd bool is set, if it is not,
+// detectSystemd will be called once for this Mounter instance.
+func (mounter *Mounter) hasSystemd() bool {
+	if !mounter.trySystemd {
+		mounter.withSystemd = &mounter.trySystemd
+	}
+
+	if mounter.withSystemd == nil {
+		withSystemd := detectSystemd()
+		mounter.withSystemd = &withSystemd
+	}
+
+	return *mounter.withSystemd
+}
+
+// Mount mounts source to target as fstype with given options. 'source' and 'fstype' must
+// be an empty string in case it's not required, e.g. for remount, or for auto filesystem
+// type, where kernel handles fstype for you. The mount 'options' is a list of options,
+// currently come from mount(8), e.g. "ro", "remount", "bind", etc. If no more option is
+// required, call Mount with an empty string list or nil.
+func (mounter *Mounter) Mount(source string, target string, fstype string, options []string) error {
+	return mounter.MountSensitive(source, target, fstype, options, nil)
+}
+
+// MountSensitive is the same as Mount() but this method allows
+// sensitiveOptions to be passed in a separate parameter from the normal
+// mount options and ensures the sensitiveOptions are never logged. This
+// method should be used by callers that pass sensitive material (like
+// passwords) as mount options.
+func (mounter *Mounter) MountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
+	// Path to mounter binary if containerized mounter is needed. Otherwise, it is set to empty.
+	// All Linux distros are expected to be shipped with a mount utility that a support bind mounts.
+	mounterPath := ""
+	bind, bindOpts, bindRemountOpts, bindRemountOptsSensitive := MakeBindOptsSensitive(options, sensitiveOptions)
+	if bind {
+		err := mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindOpts, bindRemountOptsSensitive, nil /* mountFlags */, mounter.trySystemd, nil)
+		if err != nil {
+			return err
+		}
+		return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindRemountOpts, bindRemountOptsSensitive, nil /* mountFlags */, mounter.trySystemd, nil)
+	}
+	// The list of filesystems that require containerized mounter on GCI image cluster
+	fsTypesNeedMounter := map[string]struct{}{
+		"nfs":       {},
+		"glusterfs": {},
+		"ceph":      {},
+		"cifs":      {},
+	}
+	if _, ok := fsTypesNeedMounter[fstype]; ok {
+		mounterPath = mounter.mounterPath
+	}
+	return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, options, sensitiveOptions, nil /* mountFlags */, mounter.trySystemd, nil)
+}
+
+func (mounter *Mounter) MountSensitiveWithStdin(source string, target string, fstype string, options []string, sensitiveOptions []string, stdin []string) error {
+	// Path to mounter binary if containerized mounter is needed. Otherwise, it is set to empty.
+	// All Linux distros are expected to be shipped with a mount utility that a support bind mounts.
+	mounterPath := ""
+	bind, bindOpts, bindRemountOpts, bindRemountOptsSensitive := MakeBindOptsSensitive(options, sensitiveOptions)
+	if bind {
+		err := mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindOpts, bindRemountOptsSensitive, nil /* mountFlags */, mounter.trySystemd, stdin)
+		if err != nil {
+			return err
+		}
+		return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindRemountOpts, bindRemountOptsSensitive, nil /* mountFlags */, mounter.trySystemd, stdin)
+	}
+	// The list of filesystems that require containerized mounter on GCI image cluster
+	fsTypesNeedMounter := map[string]struct{}{
+		"nfs":       {},
+		"glusterfs": {},
+		"ceph":      {},
+		"cifs":      {},
+	}
+	if _, ok := fsTypesNeedMounter[fstype]; ok {
+		mounterPath = mounter.mounterPath
+	}
+	return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, options, sensitiveOptions, nil /* mountFlags */, mounter.trySystemd, stdin)
+}
+
+// MountSensitiveWithoutSystemd is the same as MountSensitive() but disable using systemd mount.
+func (mounter *Mounter) MountSensitiveWithoutSystemd(source string, target string, fstype string, options []string, sensitiveOptions []string) error {
+	return mounter.MountSensitiveWithoutSystemdWithMountFlags(source, target, fstype, options, sensitiveOptions, nil /* mountFlags */)
+}
+
+// MountSensitiveWithoutSystemdWithMountFlags is the same as MountSensitiveWithoutSystemd with additional mount flags.
+func (mounter *Mounter) MountSensitiveWithoutSystemdWithMountFlags(source string, target string, fstype string, options []string, sensitiveOptions []string, mountFlags []string) error {
+	mounterPath := ""
+	bind, bindOpts, bindRemountOpts, bindRemountOptsSensitive := MakeBindOptsSensitive(options, sensitiveOptions)
+	if bind {
+		err := mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindOpts, bindRemountOptsSensitive, mountFlags, false, nil)
+		if err != nil {
+			return err
+		}
+		return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, bindRemountOpts, bindRemountOptsSensitive, mountFlags, false, nil)
+	}
+	// The list of filesystems that require containerized mounter on GCI image cluster
+	fsTypesNeedMounter := map[string]struct{}{
+		"nfs":       {},
+		"glusterfs": {},
+		"ceph":      {},
+		"cifs":      {},
+	}
+	if _, ok := fsTypesNeedMounter[fstype]; ok {
+		mounterPath = mounter.mounterPath
+	}
+	return mounter.doMount(mounterPath, defaultMountCommand, source, target, fstype, options, sensitiveOptions, mountFlags, false, nil)
+}
+
+// doMount runs the mount command. mounterPath is the path to mounter binary if containerized mounter is used.
+// sensitiveOptions is an extension of options except they will not be logged (because they may contain sensitive material)
+// systemdMountRequired is an extension of option to decide whether uses systemd mount.
+func (mounter *Mounter) doMount(mounterPath string, mountCmd string, source string, target string, fstype string, options []string, sensitiveOptions []string, mountFlags []string, systemdMountRequired bool, stdin []string) error {
+	mountArgs, mountArgsLogStr := MakeMountArgsSensitiveWithMountFlags(source, target, fstype, options, sensitiveOptions, mountFlags)
+	if len(mounterPath) > 0 {
+		mountArgs = append([]string{mountCmd}, mountArgs...)
+		mountArgsLogStr = mountCmd + " " + mountArgsLogStr
+		mountCmd = mounterPath
+	}
+
+	if systemdMountRequired && mounter.hasSystemd() {
+		// Try to run mount via systemd-run --scope. This will escape the
+		// service where kubelet runs and any fuse daemons will be started in a
+		// specific scope. kubelet service than can be restarted without killing
+		// these fuse daemons.
+		//
+		// Complete command line (when mounterPath is not used):
+		// systemd-run --description=... --scope -- mount -t <type> <what> <where>
+		//
+		// Expected flow:
+		// * systemd-run creates a transient scope (=~ cgroup) and executes its
+		//   argument (/bin/mount) there.
+		// * mount does its job, forks a fuse daemon if necessary and finishes.
+		//   (systemd-run --scope finishes at this point, returning mount's exit
+		//   code and stdout/stderr - thats one of --scope benefits).
+		// * systemd keeps the fuse daemon running in the scope (i.e. in its own
+		//   cgroup) until the fuse daemon dies (another --scope benefit).
+		//   Kubelet service can be restarted and the fuse daemon survives.
+		// * When the fuse daemon dies (e.g. during unmount) systemd removes the
+		//   scope automatically.
+		//
+		// systemd-mount is not used because it's too new for older distros
+		// (CentOS 7, Debian Jessie).
+		mountCmd, mountArgs, mountArgsLogStr = AddSystemdScopeSensitive("systemd-run", target, mountCmd, mountArgs, mountArgsLogStr)
+		// } else {
+		// No systemd-run on the host (or we failed to check it), assume kubelet
+		// does not run as a systemd service.
+		// No code here, mountCmd and mountArgs are already populated.
+	}
+
+	// Logging with sensitive mount options removed.
+	klog.V(4).Infof("Mounting cmd (%s) with arguments (%s)", mountCmd, mountArgsLogStr)
+	command := exec.Command(mountCmd, mountArgs...)
+	if stdin != nil {
+		writer, err := command.StdinPipe()
+		if err != nil {
+			klog.Errorf("Create stdin pipe failed: %v\nMounting command: %s\nMounting arguments: %s\n", err, mountCmd, mountArgsLogStr)
+			return fmt.Errorf("create stdin pip failed: %v\nMounting command: %s\nMounting arguments: %s", err, mountCmd, mountArgsLogStr)
+		}
+		for _, v := range stdin {
+			io.WriteString(writer, v)
+			io.WriteString(writer, "\n")
+		}
+		writer.Close()
+	}
+
+	output, err := command.CombinedOutput()
+	if err != nil {
+		if err.Error() == errNoChildProcesses {
+			if command.ProcessState.Success() {
+				// We don't consider errNoChildProcesses an error if the process itself succeeded (see - k/k issue #103753).
+				return nil
+			}
+			// Rewrite err with the actual exit error of the process.
+			err = &exec.ExitError{ProcessState: command.ProcessState}
+		}
+		klog.Errorf("Mount failed: %v\nMounting command: %s\nMounting arguments: %s\nOutput: %s\n", err, mountCmd, mountArgsLogStr, string(output))
+		return fmt.Errorf("mount failed: %v\nMounting command: %s\nMounting arguments: %s\nOutput: %s",
+			err, mountCmd, mountArgsLogStr, string(output))
+	}
+	return err
+}
+
+// detectSystemd returns true if OS runs with systemd as init. When not sure
+// (permission errors, ...), it returns false.
+// There may be different ways how to detect systemd, this one makes sure that
+// systemd-runs (needed by Mount()) works.
+func detectSystemd() bool {
+	if _, err := exec.LookPath("systemd-run"); err != nil {
+		klog.V(2).Infof("Detected OS without systemd")
+		return false
+	}
+	// Try to run systemd-run --scope /bin/true, that should be enough
+	// to make sure that systemd is really running and not just installed,
+	// which happens when running in a container with a systemd-based image
+	// but with different pid 1.
+	cmd := exec.Command("systemd-run", "--description=Kubernetes systemd probe", "--scope", "true")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		klog.V(2).Infof("Cannot run systemd-run, assuming non-systemd OS")
+		klog.V(4).Infof("systemd-run output: %s, failed with: %v", string(output), err)
+		return false
+	}
+	klog.V(2).Infof("Detected OS with systemd")
+	return true
+}
+
+// detectSafeNotMountedBehavior returns true if the umount implementation replies "not mounted"
+// when the specified path is not mounted. When not sure (permission errors, ...), it returns false.
+// When possible, we will trust umount's message and avoid doing our own mount point checks.
+// More info: https://github.com/util-linux/util-linux/blob/v2.2/mount/umount.c#L179
+func detectSafeNotMountedBehavior() bool {
+	return detectSafeNotMountedBehaviorWithExec(utilexec.New())
+}
+
+// detectSafeNotMountedBehaviorWithExec is for testing with FakeExec.
+func detectSafeNotMountedBehaviorWithExec(exec utilexec.Interface) bool {
+	// create a temp dir and try to umount it
+	path, err := os.MkdirTemp("", "kubelet-detect-safe-umount")
+	if err != nil {
+		klog.V(4).Infof("Cannot create temp dir to detect safe 'not mounted' behavior: %v", err)
+		return false
+	}
+	defer os.RemoveAll(path)
+	cmd := exec.Command("umount", path)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if strings.Contains(string(output), errNotMounted) {
+			klog.V(4).Infof("Detected umount with safe 'not mounted' behavior")
+			return true
+		}
+		klog.V(4).Infof("'umount %s' failed with: %v, output: %s", path, err, string(output))
+	}
+	klog.V(4).Infof("Detected umount with unsafe 'not mounted' behavior")
+	return false
+}
+
+// MakeMountArgs makes the arguments to the mount(8) command.
+// options MUST not contain sensitive material (like passwords).
+func MakeMountArgs(source, target, fstype string, options []string) (mountArgs []string) {
+	mountArgs, _ = MakeMountArgsSensitive(source, target, fstype, options, nil /* sensitiveOptions */)
+	return mountArgs
+}
+
+// MakeMountArgsSensitive makes the arguments to the mount(8) command.
+// sensitiveOptions is an extension of options except they will not be logged (because they may contain sensitive material)
+func MakeMountArgsSensitive(source, target, fstype string, options []string, sensitiveOptions []string) (mountArgs []string, mountArgsLogStr string) {
+	return MakeMountArgsSensitiveWithMountFlags(source, target, fstype, options, sensitiveOptions, nil /* mountFlags */)
+}
+
+// MakeMountArgsSensitiveWithMountFlags makes the arguments to the mount(8) command.
+// sensitiveOptions is an extension of options except they will not be logged (because they may contain sensitive material)
+// mountFlags are additional mount flags that are not related with the fstype
+// and mount options
+func MakeMountArgsSensitiveWithMountFlags(source, target, fstype string, options []string, sensitiveOptions []string, mountFlags []string) (mountArgs []string, mountArgsLogStr string) {
+	// Build mount command as follows:
+	//   mount [$mountFlags] [-t $fstype] [-o $options] [$source] $target
+	mountArgs = []string{}
+	mountArgsLogStr = ""
+
+	mountArgs = append(mountArgs, mountFlags...)
+	mountArgsLogStr += strings.Join(mountFlags, " ")
+
+	if len(fstype) > 0 {
+		mountArgs = append(mountArgs, "-t", fstype)
+		mountArgsLogStr += strings.Join(mountArgs, " ")
+	}
+	if len(options) > 0 || len(sensitiveOptions) > 0 {
+		combinedOptions := []string{}
+		combinedOptions = append(combinedOptions, options...)
+		combinedOptions = append(combinedOptions, sensitiveOptions...)
+		mountArgs = append(mountArgs, "-o", strings.Join(combinedOptions, ","))
+		// exclude sensitiveOptions from log string
+		mountArgsLogStr += " -o " + sanitizedOptionsForLogging(options, sensitiveOptions)
+	}
+	if len(source) > 0 {
+		mountArgs = append(mountArgs, source)
+		mountArgsLogStr += " " + source
+	}
+	mountArgs = append(mountArgs, target)
+	mountArgsLogStr += " " + target
+
+	return mountArgs, mountArgsLogStr
+}
+
+// AddSystemdScope adds "system-run --scope" to given command line
+// If args contains sensitive material, use AddSystemdScopeSensitive to construct
+// a safe to log string.
+func AddSystemdScope(systemdRunPath, mountName, command string, args []string) (string, []string) {
+	descriptionArg := fmt.Sprintf("--description=Kubernetes transient mount for %s", mountName)
+	systemdRunArgs := []string{descriptionArg, "--scope", "--", command}
+	return systemdRunPath, append(systemdRunArgs, args...)
+}
+
+// AddSystemdScopeSensitive adds "system-run --scope" to given command line
+// It also accepts takes a sanitized string containing mount arguments, mountArgsLogStr,
+// and returns the string appended to the systemd command for logging.
+func AddSystemdScopeSensitive(systemdRunPath, mountName, command string, args []string, mountArgsLogStr string) (string, []string, string) {
+	descriptionArg := fmt.Sprintf("--description=Kubernetes transient mount for %s", mountName)
+	systemdRunArgs := []string{descriptionArg, "--scope", "--", command}
+	return systemdRunPath, append(systemdRunArgs, args...), strings.Join(systemdRunArgs, " ") + " " + mountArgsLogStr
+}
+
+// Unmount unmounts the target.
+// If the mounter has safe "not mounted" behavior, no error will be returned when the target is not a mount point.
+func (mounter *Mounter) Unmount(target string) error {
+	klog.V(4).Infof("Unmounting %s", target)
+	command := exec.Command("umount", target)
+	output, err := command.CombinedOutput()
+	if err != nil {
+		return checkUmountError(target, command, output, err, mounter.withSafeNotMountedBehavior)
+	}
+	return nil
+}
+
+// UnmountWithForce unmounts given target but will retry unmounting with force option
+// after given timeout.
+func (mounter *Mounter) UnmountWithForce(target string, umountTimeout time.Duration) error {
+	err := tryUnmount(target, mounter.withSafeNotMountedBehavior, umountTimeout)
+	if err != nil {
+		if err == context.DeadlineExceeded {
+			klog.V(2).Infof("Timed out waiting for unmount of %s, trying with -f", target)
+			err = forceUmount(target, mounter.withSafeNotMountedBehavior)
+		}
+		return err
+	}
+	return nil
+}
+
+// List returns a list of all mounted filesystems.
+func (*Mounter) List() ([]MountPoint, error) {
+	return ListProcMounts(procMountsPath)
+}
+
+// IsLikelyNotMountPoint determines if a directory is not a mountpoint.
+// It is fast but not necessarily ALWAYS correct. If the path is in fact
+// a bind mount from one part of a mount to another it will not be detected.
+// It also can not distinguish between mountpoints and symbolic links.
+// mkdir /tmp/a /tmp/b; mount --bind /tmp/a /tmp/b; IsLikelyNotMountPoint("/tmp/b")
+// will return true. When in fact /tmp/b is a mount point. If this situation
+// is of interest to you, don't use this function...
+func (mounter *Mounter) IsLikelyNotMountPoint(file string) (bool, error) {
+	stat, err := os.Stat(file)
+	if err != nil {
+		return true, err
+	}
+	rootStat, err := os.Stat(filepath.Dir(strings.TrimSuffix(file, "/")))
+	if err != nil {
+		return true, err
+	}
+	// If the directory has a different device as parent, then it is a mountpoint.
+	if stat.Sys().(*syscall.Stat_t).Dev != rootStat.Sys().(*syscall.Stat_t).Dev {
+		return false, nil
+	}
+
+	return true, nil
+}
+
+// CanSafelySkipMountPointCheck relies on the detected behavior of umount when given a target that is not a mount point.
+func (mounter *Mounter) CanSafelySkipMountPointCheck() bool {
+	return mounter.withSafeNotMountedBehavior
+}
+
+// GetMountRefs finds all mount references to pathname, returns a
+// list of paths. Path could be a mountpoint or a normal
+// directory (for bind mount).
+func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
+	pathExists, pathErr := PathExists(pathname)
+	if !pathExists {
+		return []string{}, nil
+	} else if IsCorruptedMnt(pathErr) {
+		klog.Warningf("GetMountRefs found corrupted mount at %s, treating as unmounted path", pathname)
+		return []string{}, nil
+	} else if pathErr != nil {
+		return nil, fmt.Errorf("error checking path %s: %v", pathname, pathErr)
+	}
+	realpath, err := filepath.EvalSymlinks(pathname)
+	if err != nil {
+		return nil, err
+	}
+	return SearchMountPoints(realpath, procMountInfoPath)
+}
+
+// checkAndRepairFileSystem checks and repairs filesystems using command fsck.
+func (mounter *SafeFormatAndMount) checkAndRepairFilesystem(source string) error {
+	klog.V(4).Infof("Checking for issues with fsck on disk: %s", source)
+	args := []string{"-a", source}
+	out, err := mounter.Exec.Command("fsck", args...).CombinedOutput()
+	if err != nil {
+		ee, isExitError := err.(utilexec.ExitError)
+		switch {
+		case err == utilexec.ErrExecutableNotFound:
+			klog.Warningf("'fsck' not found on system; continuing mount without running 'fsck'.")
+		case isExitError && ee.ExitStatus() == fsckErrorsCorrected:
+			klog.Infof("Device %s has errors which were corrected by fsck.", source)
+		case isExitError && ee.ExitStatus() == fsckErrorsUncorrected:
+			return NewMountError(HasFilesystemErrors, "'fsck' found errors on device %s but could not correct them: %s", source, string(out))
+		case isExitError && ee.ExitStatus() > fsckErrorsUncorrected:
+			klog.Infof("`fsck` error %s", string(out))
+		default:
+			klog.Warningf("fsck on device %s failed with error %v, output: %v", source, err, string(out))
+		}
+	}
+	return nil
+}
+
+// formatAndMount uses unix utils to format and mount the given disk
+func (mounter *SafeFormatAndMount) formatAndMountSensitive(source string, target string, fstype string, options []string, sensitiveOptions []string, formatOptions []string) error {
+	readOnly := false
+	for _, option := range options {
+		if option == "ro" {
+			readOnly = true
+			break
+		}
+	}
+	if !readOnly {
+		// Check sensitiveOptions for ro
+		for _, option := range sensitiveOptions {
+			if option == "ro" {
+				readOnly = true
+				break
+			}
+		}
+	}
+
+	options = append(options, "defaults")
+	mountErrorValue := UnknownMountError
+
+	// Check if the disk is already formatted
+	existingFormat, err := mounter.GetDiskFormat(source)
+	if err != nil {
+		return NewMountError(GetDiskFormatFailed, "failed to get disk format of disk %s: %v", source, err)
+	}
+
+	// Use 'ext4' as the default
+	if len(fstype) == 0 {
+		fstype = "ext4"
+	}
+
+	if existingFormat == "" {
+		// Do not attempt to format the disk if mounting as readonly, return an error to reflect this.
+		if readOnly {
+			return NewMountError(UnformattedReadOnly, "cannot mount unformatted disk %s as we are manipulating it in read-only mode", source)
+		}
+
+		// Disk is unformatted so format it.
+		args := []string{source}
+		if fstype == "ext4" || fstype == "ext3" {
+			args = []string{
+				"-F",  // Force flag
+				"-m0", // Zero blocks reserved for super-user
+				source,
+			}
+		} else if fstype == "xfs" {
+			args = []string{
+				"-f", // force flag
+				source,
+			}
+		}
+		args = append(formatOptions, args...)
+
+		klog.Infof("Disk %q appears to be unformatted, attempting to format as type: %q with options: %v", source, fstype, args)
+
+		output, err := mounter.format(fstype, args)
+		if err != nil {
+			// Do not log sensitiveOptions only options
+			sensitiveOptionsLog := sanitizedOptionsForLogging(options, sensitiveOptions)
+			detailedErr := fmt.Sprintf("format of disk %q failed: type:(%q) target:(%q) options:(%q) errcode:(%v) output:(%v) ", source, fstype, target, sensitiveOptionsLog, err, string(output))
+			klog.Error(detailedErr)
+			return NewMountError(FormatFailed, detailedErr)
+		}
+
+		klog.Infof("Disk successfully formatted (mkfs): %s - %s %s", fstype, source, target)
+	} else {
+		if fstype != existingFormat {
+			// Verify that the disk is formatted with filesystem type we are expecting
+			mountErrorValue = FilesystemMismatch
+			klog.Warningf("Configured to mount disk %s as %s but current format is %s, things might break", source, existingFormat, fstype)
+		}
+
+		if !readOnly {
+			// Run check tools on the disk to fix repairable issues, only do this for formatted volumes requested as rw.
+			err := mounter.checkAndRepairFilesystem(source)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	// Mount the disk
+	klog.V(4).Infof("Attempting to mount disk %s in %s format at %s", source, fstype, target)
+	if err := mounter.MountSensitive(source, target, fstype, options, sensitiveOptions); err != nil {
+		return NewMountError(mountErrorValue, err.Error())
+	}
+
+	return nil
+}
+
+func (mounter *SafeFormatAndMount) format(fstype string, args []string) ([]byte, error) {
+	if mounter.formatSem != nil {
+		done := make(chan struct{})
+		defer close(done)
+
+		mounter.formatSem <- struct{}{}
+
+		go func() {
+			defer func() { <-mounter.formatSem }()
+
+			timeout := time.NewTimer(mounter.formatTimeout)
+			defer timeout.Stop()
+
+			select {
+			case <-done:
+			case <-timeout.C:
+			}
+		}()
+	}
+
+	return mounter.Exec.Command("mkfs."+fstype, args...).CombinedOutput()
+}
+
+func getDiskFormat(exec utilexec.Interface, disk string) (string, error) {
+	args := []string{"-p", "-s", "TYPE", "-s", "PTTYPE", "-o", "export", disk}
+	klog.V(4).Infof("Attempting to determine if disk %q is formatted using blkid with args: (%v)", disk, args)
+	dataOut, err := exec.Command("blkid", args...).CombinedOutput()
+	output := string(dataOut)
+	klog.V(4).Infof("Output: %q", output)
+
+	if err != nil {
+		if exit, ok := err.(utilexec.ExitError); ok {
+			if exit.ExitStatus() == 2 {
+				// Disk device is unformatted.
+				// For `blkid`, if the specified token (TYPE/PTTYPE, etc) was
+				// not found, or no (specified) devices could be identified, an
+				// exit code of 2 is returned.
+				return "", nil
+			}
+		}
+		klog.Errorf("Could not determine if disk %q is formatted (%v)", disk, err)
+		return "", err
+	}
+
+	var fstype, pttype string
+
+	lines := strings.Split(output, "\n")
+	for _, l := range lines {
+		if len(l) <= 0 {
+			// Ignore empty line.
+			continue
+		}
+		cs := strings.Split(l, "=")
+		if len(cs) != 2 {
+			return "", fmt.Errorf("blkid returns invalid output: %s", output)
+		}
+		// TYPE is filesystem type, and PTTYPE is partition table type, according
+		// to https://www.kernel.org/pub/linux/utils/util-linux/v2.21/libblkid-docs/.
+		if cs[0] == "TYPE" {
+			fstype = cs[1]
+		} else if cs[0] == "PTTYPE" {
+			pttype = cs[1]
+		}
+	}
+
+	if len(pttype) > 0 {
+		klog.V(4).Infof("Disk %s detected partition table type: %s", disk, pttype)
+		// Returns a special non-empty string as filesystem type, then kubelet
+		// will not format it.
+		return "unknown data, probably partitions", nil
+	}
+
+	return fstype, nil
+}
+
+// GetDiskFormat uses 'blkid' to see if the given disk is unformatted
+func (mounter *SafeFormatAndMount) GetDiskFormat(disk string) (string, error) {
+	return getDiskFormat(mounter.Exec, disk)
+}
+
+// ListProcMounts is shared with NsEnterMounter
+func ListProcMounts(mountFilePath string) ([]MountPoint, error) {
+	content, err := readMountInfo(mountFilePath)
+	if err != nil {
+		return nil, err
+	}
+	return parseProcMounts(content)
+}
+
+func parseProcMounts(content []byte) ([]MountPoint, error) {
+	out := []MountPoint{}
+	lines := strings.Split(string(content), "\n")
+	for _, line := range lines {
+		if line == "" {
+			// the last split() item is empty string following the last \n
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) != expectedNumFieldsPerLine {
+			// Do not log line in case it contains sensitive Mount options
+			return nil, fmt.Errorf("wrong number of fields (expected %d, got %d)", expectedNumFieldsPerLine, len(fields))
+		}
+
+		mp := MountPoint{
+			Device: fields[0],
+			Path:   fields[1],
+			Type:   fields[2],
+			Opts:   strings.Split(fields[3], ","),
+		}
+
+		freq, err := strconv.Atoi(fields[4])
+		if err != nil {
+			return nil, err
+		}
+		mp.Freq = freq
+
+		pass, err := strconv.Atoi(fields[5])
+		if err != nil {
+			return nil, err
+		}
+		mp.Pass = pass
+
+		out = append(out, mp)
+	}
+	return out, nil
+}
+
+// SearchMountPoints finds all mount references to the source, returns a list of
+// mountpoints.
+// The source can be a mount point or a normal directory (bind mount). We
+// didn't support device because there is no use case by now.
+// Some filesystems may share a source name, e.g. tmpfs. And for bind mounting,
+// it's possible to mount a non-root path of a filesystem, so we need to use
+// root path and major:minor to represent mount source uniquely.
+// This implementation is shared between Linux and NsEnterMounter
+func SearchMountPoints(hostSource, mountInfoPath string) ([]string, error) {
+	mis, err := ParseMountInfo(mountInfoPath)
+	if err != nil {
+		return nil, err
+	}
+
+	mountID := 0
+	rootPath := ""
+	major := -1
+	minor := -1
+
+	// Finding the underlying root path and major:minor if possible.
+	// We need search in backward order because it's possible for later mounts
+	// to overlap earlier mounts.
+	for i := len(mis) - 1; i >= 0; i-- {
+		if hostSource == mis[i].MountPoint || PathWithinBase(hostSource, mis[i].MountPoint) {
+			// If it's a mount point or path under a mount point.
+			mountID = mis[i].ID
+			rootPath = filepath.Join(mis[i].Root, strings.TrimPrefix(hostSource, mis[i].MountPoint))
+			major = mis[i].Major
+			minor = mis[i].Minor
+			break
+		}
+	}
+
+	if rootPath == "" || major == -1 || minor == -1 {
+		return nil, fmt.Errorf("failed to get root path and major:minor for %s", hostSource)
+	}
+
+	var refs []string
+	for i := range mis {
+		if mis[i].ID == mountID {
+			// Ignore mount entry for mount source itself.
+			continue
+		}
+		if mis[i].Root == rootPath && mis[i].Major == major && mis[i].Minor == minor {
+			refs = append(refs, mis[i].MountPoint)
+		}
+	}
+
+	return refs, nil
+}
+
+// IsMountPoint determines if a file is a mountpoint.
+// It first detects bind & any other mountpoints using
+// MountedFast function. If the MountedFast function returns
+// sure as true and err as nil, then a mountpoint is detected
+// successfully. When an error is returned by MountedFast, the
+// following is true:
+// 1. All errors are returned with IsMountPoint as false
+// except os.IsPermission.
+// 2. When os.IsPermission is returned by MountedFast, List()
+// is called to confirm if the given file is a mountpoint are not.
+//
+// os.ErrNotExist should always be returned if a file does not exist
+// as callers have in past relied on this error and not fallback.
+//
+// When MountedFast returns sure as false and err as nil (eg: in
+// case of bindmounts on kernel version 5.10- ); mounter.List()
+// endpoint is called to enumerate all the mountpoints and check if
+// it is mountpoint match or not.
+func (mounter *Mounter) IsMountPoint(file string) (bool, error) {
+	isMnt, sure, isMntErr := mountinfo.MountedFast(file)
+	if sure && isMntErr == nil {
+		return isMnt, nil
+	}
+	if isMntErr != nil {
+		if errors.Is(isMntErr, fs.ErrNotExist) {
+			return false, fs.ErrNotExist
+		}
+		// We were not allowed to do the simple stat() check, e.g. on NFS with
+		// root_squash. Fall back to /proc/mounts check below when
+		// fs.ErrPermission is returned.
+		if !errors.Is(isMntErr, fs.ErrPermission) {
+			return false, isMntErr
+		}
+	}
+	// Resolve any symlinks in file, kernel would do the same and use the resolved path in /proc/mounts.
+	resolvedFile, err := filepath.EvalSymlinks(file)
+	if err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			return false, fs.ErrNotExist
+		}
+		return false, err
+	}
+
+	// check all mountpoints since MountedFast is not sure.
+	// is not reliable for some mountpoint types.
+	mountPoints, mountPointsErr := mounter.List()
+	if mountPointsErr != nil {
+		return false, mountPointsErr
+	}
+	for _, mp := range mountPoints {
+		if isMountPointMatch(mp, resolvedFile) {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+// tryUnmount calls plain "umount" and waits for unmountTimeout for it to finish.
+func tryUnmount(target string, withSafeNotMountedBehavior bool, unmountTimeout time.Duration) error {
+	klog.V(4).Infof("Unmounting %s", target)
+	ctx, cancel := context.WithTimeout(context.Background(), unmountTimeout)
+	defer cancel()
+
+	command := exec.CommandContext(ctx, "umount", target)
+	output, err := command.CombinedOutput()
+
+	// CombinedOutput() does not return DeadlineExceeded, make sure it's
+	// propagated on timeout.
+	if ctx.Err() != nil {
+		return ctx.Err()
+	}
+
+	if err != nil {
+		return checkUmountError(target, command, output, err, withSafeNotMountedBehavior)
+	}
+	return nil
+}
+
+func forceUmount(target string, withSafeNotMountedBehavior bool) error {
+	command := exec.Command("umount", "-f", target)
+	output, err := command.CombinedOutput()
+	if err != nil {
+		return checkUmountError(target, command, output, err, withSafeNotMountedBehavior)
+	}
+	return nil
+}
+
+// checkUmountError checks a result of umount command and determine a return value.
+func checkUmountError(target string, command *exec.Cmd, output []byte, err error, withSafeNotMountedBehavior bool) error {
+	if err.Error() == errNoChildProcesses {
+		if command.ProcessState.Success() {
+			// We don't consider errNoChildProcesses an error if the process itself succeeded (see - k/k issue #103753).
+			return nil
+		}
+		// Rewrite err with the actual exit error of the process.
+		err = &exec.ExitError{ProcessState: command.ProcessState}
+	}
+	if withSafeNotMountedBehavior && strings.Contains(string(output), errNotMounted) {
+		klog.V(4).Infof("ignoring 'not mounted' error for %s", target)
+		return nil
+	}
+	return fmt.Errorf("unmount failed: %v\nUnmounting arguments: %s\nOutput: %s", err, target, string(output))
+}

pkg/webdav/node.go

@@ -0,0 +1,166 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"context"
+	"os"
+	"strings"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"k8s.io/klog/v2"
+
+	"git.ruekov.eu/ruakij/webdav-csi-driver/pkg/webdav/mount"
+)
+
+type NodeServer struct {
+	csi.UnimplementedNodeServer
+	Driver  *Driver
+	mounter mount.Interface
+}
+
+func NewNodeServer(d *Driver, mounter mount.Interface) *NodeServer {
+	return &NodeServer{
+		Driver:  d,
+		mounter: mounter,
+	}
+}
+
+// NodePublishVolume implements csi.NodeServer.
+func (n *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
+	volCap := req.GetVolumeCapability()
+	if volCap == nil {
+		return nil, status.Error(codes.InvalidArgument, "Volume capability missing in request")
+	}
+	volumeID := req.GetVolumeId()
+	if len(volumeID) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
+	}
+	targetPath := req.GetTargetPath()
+	if len(targetPath) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "Target path not provided")
+	}
+
+	mountOptions := volCap.GetMount().GetMountFlags()
+	if req.GetReadonly() {
+		mountOptions = append(mountOptions, "ro")
+	}
+
+	address, subDir, err := ParseVolumeId(volumeID)
+	if err != nil {
+		// An invalid ID should be treated as doesn't exist
+		klog.Warningf("failed to parse volume for volume id %v deletion: %v", volumeID, err)
+		return &csi.NodePublishVolumeResponse{}, nil
+	}
+
+	notMnt, err := n.mounter.IsLikelyNotMountPoint(targetPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			if err := os.MkdirAll(targetPath, os.FileMode(n.Driver.mountPermissions)); err != nil {
+				return nil, status.Error(codes.Internal, err.Error())
+			}
+			notMnt = true
+		} else {
+			return nil, status.Error(codes.Internal, err.Error())
+		}
+	}
+	if !notMnt {
+		return &csi.NodePublishVolumeResponse{}, nil
+	}
+
+	sourcePath := strings.Join([]string{address, subDir}, "/")
+	stdin := []string{req.GetSecrets()[secretUsernameKey], req.GetSecrets()[secretPasswordKey]}
+	klog.V(2).Infof("NodePublishVolume: volumeID(%v) source(%s) targetPath(%s) mountflags(%v)", volumeID, sourcePath, targetPath, mountOptions)
+	err = n.mounter.MountSensitiveWithStdin(sourcePath, targetPath, fstype, mountOptions, nil, stdin)
+	if err != nil {
+		if os.IsPermission(err) {
+			return nil, status.Error(codes.PermissionDenied, err.Error())
+		}
+		if strings.Contains(err.Error(), "invalid argument") {
+			return nil, status.Error(codes.InvalidArgument, err.Error())
+		}
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
+	return &csi.NodePublishVolumeResponse{}, nil
+}
+
+// NodeUnpublishVolume implements csi.NodeServer.
+func (n *NodeServer) NodeUnpublishVolume(ctx context.Context, req *csi.NodeUnpublishVolumeRequest) (*csi.NodeUnpublishVolumeResponse, error) {
+	volumeID := req.GetVolumeId()
+	if len(volumeID) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "Volume ID missing in request")
+	}
+	targetPath := req.GetTargetPath()
+	if len(targetPath) == 0 {
+		return nil, status.Error(codes.InvalidArgument, "Target path missing in request")
+	}
+
+	notMnt, err := n.mounter.IsLikelyNotMountPoint(targetPath)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, status.Error(codes.NotFound, "Targetpath not found")
+		}
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+	if notMnt {
+		return &csi.NodeUnpublishVolumeResponse{}, nil
+	}
+
+	klog.V(2).Infof("NodeUnpublishVolume: unmounting volume %s on %s", volumeID, targetPath)
+	err = n.mounter.Unmount(targetPath)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "failed to unmount target %q: %v", targetPath, err)
+	}
+
+	klog.V(2).Infof("NodeUnpublishVolume: unmount volume %s on %s successfully", volumeID, targetPath)
+	return &csi.NodeUnpublishVolumeResponse{}, nil
+}
+
+// NodeGetInfo implements csi.NodeServer.
+func (n *NodeServer) NodeGetInfo(context.Context, *csi.NodeGetInfoRequest) (*csi.NodeGetInfoResponse, error) {
+	return &csi.NodeGetInfoResponse{NodeId: n.Driver.nodeID}, nil
+}
+
+// NodeGetCapabilities implements csi.NodeServer.
+func (n *NodeServer) NodeGetCapabilities(context.Context, *csi.NodeGetCapabilitiesRequest) (*csi.NodeGetCapabilitiesResponse, error) {
+	return &csi.NodeGetCapabilitiesResponse{
+		Capabilities: n.Driver.nscap,
+	}, nil
+}
+
+// NodeExpandVolume implements csi.NodeServer.
+func (*NodeServer) NodeExpandVolume(context.Context, *csi.NodeExpandVolumeRequest) (*csi.NodeExpandVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// NodeGetVolumeStats implements csi.NodeServer.
+func (*NodeServer) NodeGetVolumeStats(context.Context, *csi.NodeGetVolumeStatsRequest) (*csi.NodeGetVolumeStatsResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// NodeStageVolume implements csi.NodeServer.
+func (*NodeServer) NodeStageVolume(context.Context, *csi.NodeStageVolumeRequest) (*csi.NodeStageVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}
+
+// NodeUnstageVolume implements csi.NodeServer.
+func (*NodeServer) NodeUnstageVolume(context.Context, *csi.NodeUnstageVolumeRequest) (*csi.NodeUnstageVolumeResponse, error) {
+	return nil, status.Error(codes.Unimplemented, "")
+}

pkg/webdav/server.go

@@ -0,0 +1,108 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"net"
+	"os"
+	"sync"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc"
+	"k8s.io/klog/v2"
+)
+
+// Defines Non blocking GRPC server interfaces
+type NonBlockingGRPCServer interface {
+	// Start services at the endpoint
+	Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer)
+	// Waits for the service to stop
+	Wait()
+	// Stops the service gracefully
+	Stop()
+	// Stops the service forcefully
+	ForceStop()
+}
+
+func NewNonBlockingGRPCServer() NonBlockingGRPCServer {
+	return &nonBlockingGRPCServer{}
+}
+
+// NonBlocking server
+type nonBlockingGRPCServer struct {
+	wg     sync.WaitGroup
+	server *grpc.Server
+}
+
+func (s *nonBlockingGRPCServer) Start(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
+	s.wg.Add(1)
+	go s.serve(endpoint, ids, cs, ns)
+}
+
+func (s *nonBlockingGRPCServer) Wait() {
+	s.wg.Wait()
+}
+
+func (s *nonBlockingGRPCServer) Stop() {
+	s.server.GracefulStop()
+}
+
+func (s *nonBlockingGRPCServer) ForceStop() {
+	s.server.Stop()
+}
+
+func (s *nonBlockingGRPCServer) serve(endpoint string, ids csi.IdentityServer, cs csi.ControllerServer, ns csi.NodeServer) {
+	proto, addr, err := ParseEndpoint(endpoint)
+	if err != nil {
+		klog.Fatal(err.Error())
+	}
+
+	if proto == "unix" {
+		addr = "/" + addr
+		if err := os.Remove(addr); err != nil && !os.IsNotExist(err) {
+			klog.Fatalf("Failed to remove %s, error: %s", addr, err.Error())
+		}
+	}
+
+	listener, err := net.Listen(proto, addr)
+	if err != nil {
+		klog.Fatalf("Failed to listen: %v", err)
+	}
+
+	opts := []grpc.ServerOption{
+		grpc.UnaryInterceptor(logGRPC),
+	}
+	server := grpc.NewServer(opts...)
+	s.server = server
+
+	if ids != nil {
+		csi.RegisterIdentityServer(server, ids)
+	}
+	if cs != nil {
+		csi.RegisterControllerServer(server, cs)
+	}
+	if ns != nil {
+		csi.RegisterNodeServer(server, ns)
+	}
+
+	klog.Infof("Listening for connections on address: %#v", listener.Addr())
+
+	err = server.Serve(listener)
+	if err != nil {
+		klog.Fatalf("Failed to serve grpc server: %v", err)
+	}
+}

pkg/webdav/utils.go

@@ -0,0 +1,93 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"google.golang.org/grpc"
+	"k8s.io/klog/v2"
+)
+
+func ParseEndpoint(ep string) (string, string, error) {
+	if strings.HasPrefix(strings.ToLower(ep), "unix://") || strings.HasPrefix(strings.ToLower(ep), "tcp://") {
+		s := strings.SplitN(ep, "://", 2)
+		if s[1] != "" {
+			return s[0], s[1], nil
+		}
+	}
+	return "", "", fmt.Errorf("invalid endpoint: %v", ep)
+}
+
+func getLogLevel(method string) int32 {
+	if method == "/csi.v1.Identity/Probe" ||
+		method == "/csi.v1.Node/NodeGetCapabilities" ||
+		method == "/csi.v1.Node/NodeGetVolumeStats" {
+		return 8
+	}
+	return 2
+}
+
+func logGRPC(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+	level := klog.Level(getLogLevel(info.FullMethod))
+	klog.V(level).Infof("GRPC call: %s", info.FullMethod)
+	klog.V(level).Infof("GRPC request: %s", req)
+
+	resp, err := handler(ctx, req)
+	if err != nil {
+		klog.Errorf("GRPC error: %v", err)
+	} else {
+		klog.V(level).Infof("GRPC response: %s", resp)
+	}
+	return resp, err
+}
+
+func NewControllerServiceCapability(cap csi.ControllerServiceCapability_RPC_Type) *csi.ControllerServiceCapability {
+	return &csi.ControllerServiceCapability{
+		Type: &csi.ControllerServiceCapability_Rpc{
+			Rpc: &csi.ControllerServiceCapability_RPC{
+				Type: cap,
+			},
+		},
+	}
+}
+
+func NewNodeServiceCapability(cap csi.NodeServiceCapability_RPC_Type) *csi.NodeServiceCapability {
+	return &csi.NodeServiceCapability{
+		Type: &csi.NodeServiceCapability_Rpc{
+			Rpc: &csi.NodeServiceCapability_RPC{
+				Type: cap,
+			},
+		},
+	}
+}
+
+func MakeVolumeId(webdavSharePath, volumeName string) string {
+	return fmt.Sprintf("%s#%s", webdavSharePath, volumeName)
+}
+
+func ParseVolumeId(volumeId string) (webdavSharePath, subDir string, err error) {
+	arr := strings.Split(volumeId, "#")
+	if len(arr) < 2 {
+		return "", "", errors.New("invalid volumeId")
+	}
+	return arr[0], arr[1], nil
+}

pkg/webdav/version.go

@@ -0,0 +1,66 @@
+/*
+Copyright 2023.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package webdav
+
+import (
+	"fmt"
+	"runtime"
+	"strings"
+
+	"sigs.k8s.io/yaml"
+)
+
+// These are set during build time via -ldflags
+var (
+	driverVersion = "N/A"
+	gitCommit     = "N/A"
+	buildDate     = "N/A"
+)
+
+// VersionInfo holds the version information of the driver
+type VersionInfo struct {
+	DriverName    string `json:"Driver Name"`
+	DriverVersion string `json:"Driver Version"`
+	GitCommit     string `json:"Git Commit"`
+	BuildDate     string `json:"Build Date"`
+	GoVersion     string `json:"Go Version"`
+	Compiler      string `json:"Compiler"`
+	Platform      string `json:"Platform"`
+}
+
+// GetVersion returns the version information of the driver
+func GetVersion(driverName string) VersionInfo {
+	return VersionInfo{
+		DriverName:    driverName,
+		DriverVersion: driverVersion,
+		GitCommit:     gitCommit,
+		BuildDate:     buildDate,
+		GoVersion:     runtime.Version(),
+		Compiler:      runtime.Compiler,
+		Platform:      fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}
+
+// GetVersionYAML returns the version information of the driver
+func GetVersionYAML(driverName string) (string, error) {
+	info := GetVersion(driverName)
+	marshalled, err := yaml.Marshal(&info)
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(marshalled)), nil
+}

test/kind.sh

@@ -0,0 +1 @@
+kind create cluster --config=kind.yaml

test/kind.yaml

@@ -0,0 +1,18 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+  image: kindest/node:v1.29.0
+  extraMounts:
+  - hostPath: /root/workspace/csi-driver-webdav/test/csi
+    containerPath: /csi
+networking:
+  apiServerPort: 6443
+  podSubnet: 172.16.0.0/16
+  serviceSubnet: 172.19.0.0/16
+containerdConfigPatches:
+- |-
+  [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
+    endpoint = ["https://hub-mirror.c.163.com"]
+  [plugins."io.containerd.grpc.v1.cri".registry.mirrors."localhost:5000"]
+    endpoint = ["http://registry:5000"]