mirror of https://github.com/octoleo/restic.git
62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
package restic
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import (
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"os"
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"path/filepath"
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"syscall"
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"unsafe"
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"github.com/juju/errors"
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)
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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)
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if os.IsPermission(err) {
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return os.OpenFile(node.path, os.O_RDONLY, 0)
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}
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return file, err
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}
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func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
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dir, err := os.Open(filepath.Dir(path))
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defer dir.Close()
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if err != nil {
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return err
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}
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err = utimesNanoAt(int(dir.Fd()), filepath.Base(path), utimes, AT_SYMLINK_NOFOLLOW)
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if err != nil {
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return errors.Annotate(err, "UtimesNanoAt")
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}
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return nil
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}
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// very lowlevel below
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const AT_SYMLINK_NOFOLLOW = 0x100
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func utimensat(dirfd int, path string, times *[2]syscall.Timespec, flags int) (err error) {
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var _p0 *byte
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_p0, err = syscall.BytePtrFromString(path)
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if err != nil {
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return
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}
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_, _, e1 := syscall.Syscall6(syscall.SYS_UTIMENSAT, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(times)), uintptr(flags), 0, 0)
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if e1 != 0 {
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err = e1
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}
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return
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}
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//sys utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
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func utimesNanoAt(dirfd int, path string, ts [2]syscall.Timespec, flags int) (err error) {
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return utimensat(dirfd, path, (*[2]syscall.Timespec)(unsafe.Pointer(&ts[0])), flags)
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}
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func (s statUnix) atim() syscall.Timespec { return s.Atim }
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func (s statUnix) mtim() syscall.Timespec { return s.Mtim }
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func (s statUnix) ctim() syscall.Timespec { return s.Ctim }
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