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unmount.go
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unmount.go
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// Copyright 2011-2018 Paul Ruane.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// +build !windows
package cli
import (
"fmt"
"github.com/oniony/TMSU/common/log"
"github.com/oniony/TMSU/vfs"
"os"
"os/exec"
)
var UnmountCommand = Command{
Name: "unmount",
Aliases: []string{"umount"},
Synopsis: "Unmount the virtual filesystem",
Usages: []string{"tmsu unmount MOUNTPOINT",
"tmsu unmount --all"},
Description: "Unmounts the virtual file-system at MOUNTPOINT.",
Options: Options{{"--all", "-a", "unmounts all mounted TMSU file-systems", false, ""}},
Exec: unmountExec,
}
// unexported
func unmountExec(options Options, args []string, databasePath string) (error, warnings) {
if options.HasOption("--all") {
return unmountAll(), nil
}
if len(args) < 1 {
return fmt.Errorf("too few arguments"), nil
}
return unmount(args[0]), nil
}
func unmount(path string) error {
log.Info(2, "searching path for fusermount.")
fusermountPath, err := exec.LookPath("fusermount")
if err != nil {
return fmt.Errorf("could not find 'fusermount': ensure fuse is installed: %v", err)
}
log.Infof(2, "running: %v -u %v.", fusermountPath, path)
process, err := os.StartProcess(fusermountPath, []string{fusermountPath, "-u", path}, &os.ProcAttr{})
if err != nil {
return fmt.Errorf("could not start 'fusermount': %v", err)
}
log.Info(2, "waiting for process to exit.")
processState, err := process.Wait()
if err != nil {
return fmt.Errorf("error waiting for process to exit: %v", err)
}
if !processState.Success() {
return fmt.Errorf("could not unmount virtual filesystem")
}
return nil
}
func unmountAll() error {
log.Info(2, "retrieving mount table.")
mt, err := vfs.GetMountTable()
if err != nil {
return fmt.Errorf("could not get mount table: %v", err)
}
if len(mt) == 0 {
log.Info(2, "mount table is empty.")
}
for _, mount := range mt {
err = unmount(mount.MountPath)
if err != nil {
return err
}
}
return nil
}