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