/
touch.go
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/
touch.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2015 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package helpers
/*
#include <fcntl.h> // for AT_*
#include <sys/stat.h>
#include <stdlib.h> // for free()
int touch(const char *pathname) {
// the first 0 is the dirfd, which is ignored if pathname is absolute
// the second 0 is a null pointer => use current time
return utimensat(0, pathname, 0, AT_SYMLINK_NOFOLLOW);
}
*/
import "C"
import (
"errors"
"path/filepath"
"unsafe"
)
// ErrNotAbsPath is returned when an absolute path is needed but the received
// path is not.
var ErrNotAbsPath = errors.New("not an absolute path")
// UpdateTimestamp updates the timestamp of the file at pathname. It does not
// create it if it does not exist. It does not dereference it if it is a
// symlink. It's like `touch -c -h pathname`.
//
// pathname must be absolute.
func UpdateTimestamp(pathname string) error {
if !filepath.IsAbs(pathname) {
return ErrNotAbsPath
}
p := C.CString(pathname)
defer C.free(unsafe.Pointer(p))
_, e := C.touch(p)
return e
}