59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
// +build linux
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package mtree
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import (
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"encoding/base64"
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"os"
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"syscall"
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"time"
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"unsafe"
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"github.com/vbatts/go-mtree/xattr"
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)
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func xattrUpdateKeywordFunc(path string, kv KeyVal) (os.FileInfo, error) {
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buf, err := base64.StdEncoding.DecodeString(kv.Value())
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if err != nil {
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return nil, err
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}
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if err := xattr.Set(path, kv.Keyword().Suffix(), buf); err != nil {
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return nil, err
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}
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return os.Lstat(path)
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}
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func lchtimes(name string, atime time.Time, mtime time.Time) error {
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var utimes [2]syscall.Timespec
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utimes[0] = syscall.NsecToTimespec(atime.UnixNano())
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utimes[1] = syscall.NsecToTimespec(mtime.UnixNano())
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if e := utimensat(atFdCwd, name, (*[2]syscall.Timespec)(unsafe.Pointer(&utimes[0])), atSymlinkNofollow); e != nil {
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return &os.PathError{Op: "chtimes", Path: name, Err: e}
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}
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return nil
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}
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// from uapi/linux/fcntl.h
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// don't follow symlinks
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const atSymlinkNofollow = 0x100
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// special value for utimes as the FD for the current working directory
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const atFdCwd = -0x64
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func utimensat(dirfd int, path string, times *[2]syscall.Timespec, flags int) (err error) {
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if len(times) != 2 {
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return syscall.EINVAL
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}
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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 = syscall.Errno(e1)
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}
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return
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}
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