mirror of
https://github.com/kovidgoyal/kitty.git
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56 lines
1.0 KiB
Go
56 lines
1.0 KiB
Go
// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
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package utils
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import (
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"fmt"
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"io/fs"
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"os"
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"path/filepath"
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)
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var _ = fmt.Print
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func AtomicWriteFile(path string, data []byte, perm os.FileMode) (err error) {
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path, err = filepath.EvalSymlinks(path)
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if err == nil {
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path, err = filepath.Abs(path)
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if err == nil {
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var f *os.File
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f, err = os.CreateTemp(filepath.Dir(path), filepath.Base(path))
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if err == nil {
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removed := false
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defer func() {
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f.Close()
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if !removed {
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os.Remove(f.Name())
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}
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}()
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_, err = f.Write(data)
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if err == nil {
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err = f.Chmod(perm)
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if err == nil {
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err = os.Rename(f.Name(), path)
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if err == nil {
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removed = true
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}
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}
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}
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}
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}
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}
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return
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}
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func AtomicUpdateFile(path string, data []byte, perms ...fs.FileMode) (err error) {
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perm := fs.FileMode(0o666)
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if len(perms) > 0 {
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perm = perms[0]
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}
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s, err := os.Stat(path)
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if err == nil {
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perm = s.Mode().Perm()
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}
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return AtomicWriteFile(path, data, perm)
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}
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