mirror of
https://github.com/restic/restic.git
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ff7ef5007e
The ioutil functions are deprecated since Go 1.17 and only wrap another library function. Thus directly call the underlying function. This commit only mechanically replaces the function calls.
79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
package fs
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import (
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"math/rand"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"golang.org/x/sys/windows"
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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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// TempFile creates a temporary file which is marked as delete-on-close
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func TempFile(dir, prefix string) (f *os.File, err error) {
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// slightly modified implementation of os.CreateTemp(dir, prefix) to allow us to add
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// the FILE_ATTRIBUTE_TEMPORARY | FILE_FLAG_DELETE_ON_CLOSE flags.
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// These provide two large benefits:
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// FILE_ATTRIBUTE_TEMPORARY tells Windows to keep the file in memory only if possible
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// which reduces the amount of unnecessary disk writes.
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// FILE_FLAG_DELETE_ON_CLOSE instructs Windows to automatically delete the file once
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// all file descriptors are closed.
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if dir == "" {
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dir = os.TempDir()
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}
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access := uint32(windows.GENERIC_READ | windows.GENERIC_WRITE)
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creation := uint32(windows.CREATE_NEW)
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share := uint32(0) // prevent other processes from accessing the file
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flags := uint32(windows.FILE_ATTRIBUTE_TEMPORARY | windows.FILE_FLAG_DELETE_ON_CLOSE)
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rnd := rand.New(rand.NewSource(time.Now().UnixNano()))
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for i := 0; i < 10000; i++ {
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randSuffix := strconv.Itoa(int(1e9 + rnd.Intn(1e9)%1e9))[1:]
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path := filepath.Join(dir, prefix+randSuffix)
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ptr, err := windows.UTF16PtrFromString(path)
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if err != nil {
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return nil, err
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}
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h, err := windows.CreateFile(ptr, access, share, nil, creation, flags, 0)
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if os.IsExist(err) {
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continue
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}
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return os.NewFile(uintptr(h), path), err
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}
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// Proper error handling is still to do
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return nil, os.ErrExist
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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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