78 lines
2 KiB
Go
78 lines
2 KiB
Go
//go:build linux
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package mountlib
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import (
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"fmt"
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"path/filepath"
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"strings"
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"github.com/moby/sys/mountinfo"
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)
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// CheckMountEmpty checks if folder is not already a mountpoint.
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// On Linux we use the OS-specific /proc/self/mountinfo API so the check won't access the path.
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// Directories marked as "mounted" by autofs are considered not mounted.
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func CheckMountEmpty(mountpoint string) error {
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const msg = "directory already mounted, use --allow-non-empty to mount anyway: %s"
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mountpointAbs, err := filepath.Abs(mountpoint)
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if err != nil {
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return fmt.Errorf("cannot get absolute path: %s: %w", mountpoint, err)
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}
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infos, err := mountinfo.GetMounts(mountinfo.SingleEntryFilter(mountpointAbs))
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if err != nil {
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return fmt.Errorf("cannot get mounts: %w", err)
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}
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foundAutofs := false
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for _, info := range infos {
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if info.FSType != "autofs" {
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return fmt.Errorf(msg, mountpointAbs)
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}
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foundAutofs = true
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}
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// It isn't safe to list an autofs in the middle of mounting
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if foundAutofs {
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return nil
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}
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return checkMountEmpty(mountpoint)
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}
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// singleEntryFilter looks for a specific entry.
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//
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// It may appear more than once and we return all of them if so.
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func singleEntryFilter(mp string) mountinfo.FilterFunc {
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return func(m *mountinfo.Info) (skip, stop bool) {
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return m.Mountpoint != mp, false
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}
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}
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// CheckMountReady checks whether mountpoint is mounted by rclone.
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// Only mounts with type "rclone" or "fuse.rclone" count.
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func CheckMountReady(mountpoint string) error {
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const msg = "mount not ready: %s"
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mountpointAbs, err := filepath.Abs(mountpoint)
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if err != nil {
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return fmt.Errorf("cannot get absolute path: %s: %w", mountpoint, err)
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}
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infos, err := mountinfo.GetMounts(singleEntryFilter(mountpointAbs))
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if err != nil {
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return fmt.Errorf("cannot get mounts: %w", err)
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}
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for _, info := range infos {
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if strings.Contains(info.FSType, "rclone") {
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return nil
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}
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}
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return fmt.Errorf(msg, mountpointAbs)
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}
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// CanCheckMountReady is set if CheckMountReady is functional
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var CanCheckMountReady = true
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