mirror of
https://github.com/restic/restic.git
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98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
package fs
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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)
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// fixpath returns an absolute path on windows, so restic can open long file
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// names.
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func fixpath(name string) string {
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abspath, err := filepath.Abs(name)
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if err == nil {
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// Check if \\?\UNC\ already exist
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if strings.HasPrefix(abspath, `\\?\UNC\`) {
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return abspath
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}
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// Check if \\?\ already exist
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if strings.HasPrefix(abspath, `\\?\`) {
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return abspath
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}
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// Check if path starts with \\
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if strings.HasPrefix(abspath, `\\`) {
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return strings.Replace(abspath, `\\`, `\\?\UNC\`, 1)
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}
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// Normal path
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return `\\?\` + abspath
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}
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return name
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}
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// MkdirAll creates a directory named path, along with any necessary parents,
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// and returns nil, or else returns an error. The permission bits perm are used
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// for all directories that MkdirAll creates. If path is already a directory,
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// MkdirAll does nothing and returns nil.
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//
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// Adapted from the stdlib MkdirAll, added test for volume name.
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func MkdirAll(path string, perm os.FileMode) error {
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// Fast path: if we can tell whether path is a directory or file, stop with success or error.
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dir, err := os.Stat(path)
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if err == nil {
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if dir.IsDir() {
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return nil
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}
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return &os.PathError{
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Op: "mkdir",
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Path: path,
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Err: syscall.ENOTDIR,
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}
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}
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// Slow path: make sure parent exists and then call Mkdir for path.
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i := len(path)
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for i > 0 && os.IsPathSeparator(path[i-1]) { // Skip trailing path separator.
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i--
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}
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j := i
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for j > 0 && !os.IsPathSeparator(path[j-1]) { // Scan backward over element.
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j--
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}
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if j > 1 {
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// Create parent
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parent := path[0 : j-1]
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if parent != filepath.VolumeName(parent) {
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err = MkdirAll(parent, perm)
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if err != nil {
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return err
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}
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}
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}
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// Parent now exists; invoke Mkdir and use its result.
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err = os.Mkdir(path, perm)
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if err != nil {
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// Handle arguments like "foo/." by
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// double-checking that directory doesn't exist.
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dir, err1 := os.Lstat(path)
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if err1 == nil && dir.IsDir() {
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return nil
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}
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return err
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}
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return nil
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}
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// TempFile creates a temporary file.
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func TempFile(dir, prefix string) (f *os.File, err error) {
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return ioutil.TempFile(dir, prefix)
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}
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// Chmod changes the mode of the named file to mode.
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func Chmod(name string, mode os.FileMode) error {
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return os.Chmod(fixpath(name), mode)
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}
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