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7a8cdb6d19
* v2 -> v3 * Increase version within Makefile --------- Co-authored-by: JanHoefelmeyer <hoefelmeyer.jan@gmail.com>
95 lines
1.8 KiB
Go
95 lines
1.8 KiB
Go
// This file is Free Software under the MIT License
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// without warranty, see README.md and LICENSES/MIT.txt for details.
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//
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// SPDX-License-Identifier: MIT
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//
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// SPDX-FileCopyrightText: 2022 German Federal Office for Information Security (BSI) <https://www.bsi.bund.de>
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// Software-Engineering: 2022 Intevation GmbH <https://intevation.de>
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package main
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import (
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"log"
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"os"
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"path/filepath"
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"github.com/csaf-poc/csaf_distribution/v3/util"
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)
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type lazyTransaction struct {
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src string
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dstDir string
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dst string
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}
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func newLazyTransaction(src, dstDir string) *lazyTransaction {
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return &lazyTransaction{
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src: src,
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dstDir: dstDir,
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}
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}
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func (lt *lazyTransaction) Src() string {
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return lt.src
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}
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func (lt *lazyTransaction) Dst() (string, error) {
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if lt.dst != "" {
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return lt.dst, nil
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}
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srcBase := filepath.Base(lt.src)
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folder := filepath.Join(lt.dstDir, srcBase)
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dst, err := util.MakeUniqDir(folder)
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if err != nil {
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return "", err
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}
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// Copy old content into new.
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if err := util.DeepCopy(dst, lt.src); err != nil {
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os.RemoveAll(dst)
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return "", err
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}
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lt.dst = dst
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return dst, nil
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}
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func (lt *lazyTransaction) rollback() error {
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if lt.dst == "" {
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return nil
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}
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err := os.RemoveAll(lt.dst)
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lt.dst = ""
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return err
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}
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func (lt *lazyTransaction) commit() error {
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if lt.dst == "" {
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return nil
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}
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defer func() { lt.dst = "" }()
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// The expanded path of the original link.
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orig, err := filepath.EvalSymlinks(lt.src)
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if err != nil {
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os.RemoveAll(lt.dst)
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return err
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}
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// Switch directories.
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symlink := filepath.Join(lt.dst, filepath.Base(lt.src))
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if err := os.Symlink(lt.dst, symlink); err != nil {
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os.RemoveAll(lt.dst)
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return err
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}
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log.Printf("Move %q -> %q\n", symlink, lt.src)
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if err := os.Rename(symlink, lt.src); err != nil {
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os.RemoveAll(lt.dst)
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return err
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}
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return os.RemoveAll(orig)
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}
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