93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
//go:build !windows
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// +build !windows
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package copier
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import (
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"fmt"
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"os"
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"syscall"
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"time"
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"golang.org/x/sys/unix"
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)
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var canChroot = os.Getuid() == 0
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func chroot(root string) (bool, error) {
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if canChroot {
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if err := os.Chdir(root); err != nil {
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return false, fmt.Errorf("changing to intended-new-root directory %q: %w", root, err)
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}
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if err := unix.Chroot(root); err != nil {
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return false, fmt.Errorf("chrooting to directory %q: %w", root, err)
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}
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if err := os.Chdir(string(os.PathSeparator)); err != nil {
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return false, fmt.Errorf("changing to just-became-root directory %q: %w", root, err)
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}
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return true, nil
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}
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return false, nil
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}
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func chrMode(mode os.FileMode) uint32 {
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return uint32(unix.S_IFCHR | mode)
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}
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func blkMode(mode os.FileMode) uint32 {
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return uint32(unix.S_IFBLK | mode)
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}
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func mkdev(major, minor uint32) uint64 {
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return unix.Mkdev(major, minor)
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}
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func mkfifo(path string, mode uint32) error {
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return unix.Mkfifo(path, mode)
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}
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func chmod(path string, mode os.FileMode) error {
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return os.Chmod(path, mode)
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}
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func chown(path string, uid, gid int) error {
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return os.Chown(path, uid, gid)
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}
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func lchown(path string, uid, gid int) error {
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return os.Lchown(path, uid, gid)
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}
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func lutimes(_ bool, path string, atime, mtime time.Time) error {
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if atime.IsZero() || mtime.IsZero() {
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now := time.Now()
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if atime.IsZero() {
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atime = now
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}
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if mtime.IsZero() {
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mtime = now
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}
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}
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return unix.Lutimes(path, []unix.Timeval{unix.NsecToTimeval(atime.UnixNano()), unix.NsecToTimeval(mtime.UnixNano())})
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}
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// sameDevice returns true unless we're sure that they're not on the same device
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func sameDevice(a, b os.FileInfo) bool {
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aSys := a.Sys()
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bSys := b.Sys()
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if aSys == nil || bSys == nil {
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return true
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}
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au, aok := aSys.(*syscall.Stat_t)
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bu, bok := bSys.(*syscall.Stat_t)
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if !aok || !bok {
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return true
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}
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return au.Dev == bu.Dev
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}
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const (
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testModeMask = int64(os.ModePerm)
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testIgnoreSymlinkDates = false
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)
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