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mount: extract FUSE unmounting to a function

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Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2020-09-28 13:50:29 +02:00
parent 5b13dcc73a
commit 48f64a18be
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GPG Key ID: 76698F39D527CE8C
1 changed files with 21 additions and 10 deletions
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27
mount/mount_linux.go
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@ -106,9 +106,10 @@ func Unmount(target string, flags int) error {
return nil
}
// fuseSuperMagic is defined in statfs(2)
const fuseSuperMagic = 0x65735546
func isFUSE(dir string) bool {
// fuseSuperMagic is defined in statfs(2)
const fuseSuperMagic = 0x65735546
var st unix.Statfs_t
if err := unix.Statfs(dir, &st); err != nil {
return false
@ -116,16 +117,26 @@ func isFUSE(dir string) bool {
return st.Type == fuseSuperMagic
}
func unmount(target string, flags int) error {
// For FUSE mounts, attempting to execute fusermount helper binary is preferred
// https://github.com/containerd/containerd/pull/3765#discussion_r342083514
if isFUSE(target) {
// unmountFUSE attempts to unmount using fusermount/fusermount3 helper binary.
//
// For FUSE mounts, using these helper binaries is preferred, see:
// https://github.com/containerd/containerd/pull/3765#discussion_r342083514
func unmountFUSE(target string) error {
var err error
for _, helperBinary := range []string{"fusermount3", "fusermount"} {
cmd := exec.Command(helperBinary, "-u", target)
if err := cmd.Run(); err == nil {
err = cmd.Run()
if err == nil {
return nil
}
// ignore error and try unix.Unmount
}
return err
}
func unmount(target string, flags int) error {
if isFUSE(target) {
if err := unmountFUSE(target); err == nil {
return nil
}
}
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