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66 lines
1.6 KiB
66 lines
1.6 KiB
// +build linux freebsd,cgo openbsd,cgo
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package mountinfo
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"golang.org/x/sys/unix"
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)
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func mountedByStat(path string) (bool, error) {
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var st unix.Stat_t
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if err := unix.Lstat(path, &st); err != nil {
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if err == unix.ENOENT {
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// Treat ENOENT as "not mounted".
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return false, nil
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}
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return false, &os.PathError{Op: "stat", Path: path, Err: err}
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}
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dev := st.Dev
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parent := filepath.Dir(path)
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if err := unix.Lstat(parent, &st); err != nil {
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return false, &os.PathError{Op: "stat", Path: parent, Err: err}
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}
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if dev != st.Dev {
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// Device differs from that of parent,
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// so definitely a mount point.
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return true, nil
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}
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// NB: this does not detect bind mounts on Linux.
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return false, nil
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}
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func normalizePath(path string) (realPath string, err error) {
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if realPath, err = filepath.Abs(path); err != nil {
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return "", fmt.Errorf("unable to get absolute path for %q: %w", path, err)
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}
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if realPath, err = filepath.EvalSymlinks(realPath); err != nil {
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return "", fmt.Errorf("failed to canonicalise path for %q: %w", path, err)
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}
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if _, err := os.Stat(realPath); err != nil {
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return "", fmt.Errorf("failed to stat target of %q: %w", path, err)
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}
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return realPath, nil
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}
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func mountedByMountinfo(path string) (bool, error) {
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path, err := normalizePath(path)
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if err != nil {
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if errors.Is(err, unix.ENOENT) {
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// treat ENOENT as "not mounted"
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return false, nil
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}
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return false, err
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}
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entries, err := GetMounts(SingleEntryFilter(path))
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if err != nil {
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return false, err
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}
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return len(entries) > 0, nil
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}
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