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Merge pull request #599 from restic/remove-lowlevel-syscall

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Replace lowlevel syscall to restore symlink times
This commit is contained in:
Alexander Neumann 2016-08-31 19:28:23 +02:00
commit d497fb6966
1 changed files with 8 additions and 25 deletions
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33
src/restic/node_linux.go
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@ -3,7 +3,8 @@ package restic
import (
"path/filepath"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
"github.com/pkg/errors"
@ -17,7 +18,12 @@ func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespe
return errors.Wrap(err, "Open")
}
err = utimesNanoAt(int(dir.Fd()), filepath.Base(path), utimes, AT_SYMLINK_NOFOLLOW)
times := []unix.Timespec{
{Sec: utimes[0].Sec, Nsec: utimes[0].Nsec},
{Sec: utimes[1].Sec, Nsec: utimes[1].Nsec},
}
err = unix.UtimesNanoAt(int(dir.Fd()), filepath.Base(path), times, unix.AT_SYMLINK_NOFOLLOW)
if err != nil {
return errors.Wrap(err, "UtimesNanoAt")
@ -26,29 +32,6 @@ func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespe
return nil
}
// 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)
}
func (s statUnix) atim() syscall.Timespec { return s.Atim }
func (s statUnix) mtim() syscall.Timespec { return s.Mtim }
func (s statUnix) ctim() syscall.Timespec { return s.Ctim }