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