restic/node_linux.go

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package restic
import (
"os"
"path/filepath"
"syscall"
"unsafe"
"github.com/juju/errors"
)
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func (node *Node) OpenForReading() (*os.File, error) {
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file, err := os.OpenFile(node.path, os.O_RDONLY|syscall.O_NOATIME, 0)
if os.IsPermission(err) {
return os.OpenFile(node.path, os.O_RDONLY, 0)
}
return file, err
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}
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
}
err = utimesNanoAt(int(dir.Fd()), filepath.Base(path), utimes, AT_SYMLINK_NOFOLLOW)
if err != nil {
return errors.Annotate(err, "UtimesNanoAt")
}
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 }