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node/Linux: Implement setting timestamps for symlinks

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This commit is contained in:
Alexander Neumann 2015-05-14 23:06:11 +02:00
parent af06376b5b
commit 44219c5afe
5 changed files with 62 additions and 9 deletions
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24
node.go
View File

@ -146,13 +146,11 @@ func (node Node) restoreMetadata(path string) error {
return errors.Annotate(err, "Lchown")
}
if node.Type == "symlink" {
return nil
}
err = os.Chmod(path, node.Mode)
if err != nil {
return errors.Annotate(err, "Chmod")
if node.Type != "symlink" {
err = os.Chmod(path, node.Mode)
if err != nil {
return errors.Annotate(err, "Chmod")
}
}
if node.Type != "dir" {
@ -166,12 +164,20 @@ func (node Node) restoreMetadata(path string) error {
}
func (node Node) RestoreTimestamps(path string) error {
var utimes = []syscall.Timespec{
var utimes = [...]syscall.Timespec{
syscall.NsecToTimespec(node.AccessTime.UnixNano()),
syscall.NsecToTimespec(node.ModTime.UnixNano()),
}
if err := syscall.UtimesNano(path, utimes); err != nil {
if node.Type == "symlink" {
if err := node.restoreSymlinkTimestamps(path, utimes); err != nil {
return errors.Annotate(err, "UtimesNano")
}
return nil
}
if err := syscall.UtimesNano(path, utimes[:]); err != nil {
return errors.Annotate(err, "UtimesNano")
}

4
node_darwin.go
View File

@ -18,3 +18,7 @@ func (node *Node) fillTimes(stat *syscall.Stat_t) {
node.ChangeTime = time.Unix(stat.Ctimespec.Unix())
node.AccessTime = time.Unix(stat.Atimespec.Unix())
}
func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
return nil
}

4
node_freebsd.go
View File

@ -18,3 +18,7 @@ func (node *Node) fillTimes(stat *syscall.Stat_t) {
func changeTime(stat *syscall.Stat_t) time.Time {
return time.Unix(stat.Ctimespec.Unix())
}
func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
return nil
}

35
node_linux.go
View File

@ -2,8 +2,10 @@ package restic
import (
"os"
"path/filepath"
"syscall"
"time"
"unsafe"
)
func (node *Node) OpenForReading() (*os.File, error) {
@ -22,3 +24,36 @@ func (node *Node) fillTimes(stat *syscall.Stat_t) {
func changeTime(stat *syscall.Stat_t) time.Time {
return time.Unix(stat.Ctim.Unix())
}
func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
dir, err := os.Open(filepath.Dir(path))
defer dir.Close()
if err != nil {
return err
}
return utimesNanoAt(int(dir.Fd()), filepath.Base(path), utimes, AT_SYMLINK_NOFOLLOW)
}
// very lowlevel below
const AT_SYMLINK_NOFOLLOW = 0x100
func utimensat(dirfd int, path string, times *[2]syscall.Timespec, flags int) (err error) {
var _p0 *byte
_p0, err = syscall.BytePtrFromString(path)
if err != nil {
return
}
_, _, e1 := syscall.Syscall6(syscall.SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)), uintptr(flags), 0, 0)
if e1 != 0 {
err = e1
}
return
}
//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
func utimesNanoAt(dirfd int, path string, ts [2]syscall.Timespec, flags int) (err error) {
return utimensat(dirfd, path, (*[2]syscall.Timespec)(unsafe.Pointer(&ts[0])), flags)
}

4
node_openbsd.go
View File

@ -22,3 +22,7 @@ func (node *Node) fillTimes(stat *syscall.Stat_t) {
func changeTime(stat *syscall.Stat_t) time.Time {
return time.Unix(stat.Ctim.Unix())
}
func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
return nil
}