mirror of https://github.com/docker/cli.git
88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
// +build !darwin,!windows
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package mount
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import (
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"fmt"
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"sort"
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"github.com/moby/sys/mountinfo"
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"golang.org/x/sys/unix"
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)
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// Mount will mount filesystem according to the specified configuration.
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// Options must be specified like the mount or fstab unix commands:
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// "opt1=val1,opt2=val2". See flags.go for supported option flags.
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func Mount(device, target, mType, options string) error {
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flag, data := parseOptions(options)
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return mount(device, target, mType, uintptr(flag), data)
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}
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// Unmount lazily unmounts a filesystem on supported platforms, otherwise does
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// a normal unmount. If target is not a mount point, no error is returned.
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func Unmount(target string) error {
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err := unix.Unmount(target, mntDetach)
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if err == nil || err == unix.EINVAL {
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// Ignore "not mounted" error here. Note the same error
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// can be returned if flags are invalid, so this code
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// assumes that the flags value is always correct.
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return nil
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}
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return &mountError{
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op: "umount",
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target: target,
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flags: uintptr(mntDetach),
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err: err,
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}
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}
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// RecursiveUnmount unmounts the target and all mounts underneath, starting
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// with the deepest mount first. The argument does not have to be a mount
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// point itself.
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func RecursiveUnmount(target string) error {
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// Fast path, works if target is a mount point that can be unmounted.
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// On Linux, mntDetach flag ensures a recursive unmount. For other
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// platforms, if there are submounts, we'll get EBUSY (and fall back
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// to the slow path). NOTE we do not ignore EINVAL here as target might
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// not be a mount point itself (but there can be mounts underneath).
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if err := unix.Unmount(target, mntDetach); err == nil {
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return nil
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}
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// Slow path: get all submounts, sort, unmount one by one.
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mounts, err := mountinfo.GetMounts(mountinfo.PrefixFilter(target))
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if err != nil {
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return err
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}
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// Make the deepest mount be first
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sort.Slice(mounts, func(i, j int) bool {
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return len(mounts[i].Mountpoint) > len(mounts[j].Mountpoint)
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})
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var (
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suberr error
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lastMount = len(mounts) - 1
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)
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for i, m := range mounts {
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err = Unmount(m.Mountpoint)
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if err != nil {
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if i == lastMount {
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if suberr != nil {
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return fmt.Errorf("%w (possible cause: %s)", err, suberr)
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}
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return err
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}
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// This is a submount, we can ignore the error for now,
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// the final unmount will fail if this is a real problem.
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// With that in mind, the _first_ failed unmount error
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// might be the real error cause, so let's keep it.
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if suberr == nil {
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suberr = err
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}
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}
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}
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return nil
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}
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