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//go:build linux
// +build linux
package mountlib
import (
"fmt"
"path/filepath"
"strings"
"time"
"github.com/moby/sys/mountinfo"
)
const (
pollInterval = 100 * time.Millisecond
)
// 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)
}
// WaitMountReady waits until mountpoint is mounted by rclone.
func WaitMountReady(mountpoint string, timeout time.Duration) (err error) {
endTime := time.Now().Add(timeout)
for {
err = CheckMountReady(mountpoint)
delay := time.Until(endTime)
if err == nil || delay <= 0 {
break
}
if delay > pollInterval {
delay = pollInterval
}
time.Sleep(delay)
}
return
}
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