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94 lines
2.8 KiB
Go
94 lines
2.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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)
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const (
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// Location of the mount file to use
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chrootCmd = "chroot"
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mountCmd = "mount"
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rootfs = "rootfs"
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nfsRPCBindErrMsg = "mount.nfs: rpc.statd is not running but is required for remote locking.\nmount.nfs: Either use '-o nolock' to keep locks local, or start statd.\nmount.nfs: an incorrect mount option was specified\n"
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rpcBindCmd = "/sbin/rpcbind"
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defaultRootfs = "/home/kubernetes/containerized_mounter/rootfs"
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)
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func main() {
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if len(os.Args) < 2 {
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fmt.Fprintf(os.Stderr, "Command failed: must provide a command to run.\n")
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return
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}
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path, _ := filepath.Split(os.Args[0])
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rootfsPath := filepath.Join(path, rootfs)
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if _, err := os.Stat(rootfsPath); os.IsNotExist(err) {
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rootfsPath = defaultRootfs
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}
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command := os.Args[1]
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switch command {
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case mountCmd:
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mountErr := mountInChroot(rootfsPath, os.Args[2:])
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if mountErr != nil {
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fmt.Fprintf(os.Stderr, "Mount failed: %v", mountErr)
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os.Exit(1)
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}
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default:
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fmt.Fprintf(os.Stderr, "Unknown command, must be %s", mountCmd)
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os.Exit(1)
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}
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}
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// MountInChroot is to run mount within chroot with the passing root directory
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func mountInChroot(rootfsPath string, args []string) error {
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if _, err := os.Stat(rootfsPath); os.IsNotExist(err) {
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return fmt.Errorf("path <%s> does not exist", rootfsPath)
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}
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args = append([]string{rootfsPath, mountCmd}, args...)
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output, err := exec.Command(chrootCmd, args...).CombinedOutput()
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if err == nil {
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return nil
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}
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if !strings.EqualFold(string(output), nfsRPCBindErrMsg) {
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// Mount failed but not because of RPC bind error
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return fmt.Errorf("mount failed: %v\nMounting command: %s\nMounting arguments: %v\nOutput: %s", err, chrootCmd, args, string(output))
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}
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// Mount failed because it is NFS V3 and we need to run rpcBind
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output, err = exec.Command(chrootCmd, rootfsPath, rpcBindCmd, "-w").CombinedOutput()
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if err != nil {
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return fmt.Errorf("mount issued for NFS V3 but unable to run rpcbind:\n Output: %s\n Error: %v", string(output), err)
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}
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// Rpcbind is running, try mounting again
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output, err = exec.Command(chrootCmd, args...).CombinedOutput()
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if err != nil {
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return fmt.Errorf("mount failed for NFS V3 even after running rpcBind %s, %v", string(output), err)
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}
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return nil
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}
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