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Refactor git command package to improve security and maintainability (#22678)
This PR follows #21535 (and replace #22592) ## Review without space diff https://github.com/go-gitea/gitea/pull/22678/files?diff=split&w=1 ## Purpose of this PR 1. Make git module command completely safe (risky user inputs won't be passed as argument option anymore) 2. Avoid low-level mistakes like https://github.com/go-gitea/gitea/pull/22098#discussion_r1045234918 3. Remove deprecated and dirty `CmdArgCheck` function, hide the `CmdArg` type 4. Simplify code when using git command ## The main idea of this PR * Move the `git.CmdArg` to the `internal` package, then no other package except `git` could use it. Then developers could never do `AddArguments(git.CmdArg(userInput))` any more. * Introduce `git.ToTrustedCmdArgs`, it's for user-provided and already trusted arguments. It's only used in a few cases, for example: use git arguments from config file, help unit test with some arguments. * Introduce `AddOptionValues` and `AddOptionFormat`, they make code more clear and simple: * Before: `AddArguments("-m").AddDynamicArguments(message)` * After: `AddOptionValues("-m", message)` * - * Before: `AddArguments(git.CmdArg(fmt.Sprintf("--author='%s <%s>'", sig.Name, sig.Email)))` * After: `AddOptionFormat("--author='%s <%s>'", sig.Name, sig.Email)` ## FAQ ### Why these changes were not done in #21535 ? #21535 is mainly a search&replace, it did its best to not change too much logic. Making the framework better needs a lot of changes, so this separate PR is needed as the second step. ### The naming of `AddOptionXxx` According to git's manual, the `--xxx` part is called `option`. ### How can it guarantee that `internal.CmdArg` won't be not misused? Go's specification guarantees that. Trying to access other package's internal package causes compilation error. And, `golangci-lint` also denies the git/internal package. Only the `git/command.go` can use it carefully. ### There is still a `ToTrustedCmdArgs`, will it still allow developers to make mistakes and pass untrusted arguments? Generally speaking, no. Because when using `ToTrustedCmdArgs`, the code will be very complex (see the changes for examples). Then developers and reviewers can know that something might be unreasonable. ### Why there was a `CmdArgCheck` and why it's removed? At the moment of #21535, to reduce unnecessary changes, `CmdArgCheck` was introduced as a hacky patch. Now, almost all code could be written as `cmd := NewCommand(); cmd.AddXxx(...)`, then there is no need for `CmdArgCheck` anymore. ### Why many codes for `signArg == ""` is deleted? Because in the old code, `signArg` could never be empty string, it's either `-S[key-id]` or `--no-gpg-sign`. So the `signArg == ""` is just dead code. --------- Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This commit is contained in:
wxiaoguang
@@ -376,16 +376,16 @@ func checkConflicts(ctx context.Context, pr *issues_model.PullRequest, gitRepo *
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prConfig := prUnit.PullRequestsConfig()
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// 6. Prepare the arguments to apply the patch against the index
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args := []git.CmdArg{"apply", "--check", "--cached"}
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cmdApply := git.NewCommand(gitRepo.Ctx, "apply", "--check", "--cached")
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if prConfig.IgnoreWhitespaceConflicts {
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args = append(args, "--ignore-whitespace")
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cmdApply.AddArguments("--ignore-whitespace")
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}
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is3way := false
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if git.CheckGitVersionAtLeast("2.32.0") == nil {
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args = append(args, "--3way")
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cmdApply.AddArguments("--3way")
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is3way = true
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}
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args = append(args, git.CmdArgCheck(patchPath))
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cmdApply.AddDynamicArguments(patchPath)
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// 7. Prep the pipe:
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// - Here we could do the equivalent of:
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@@ -407,71 +407,70 @@ func checkConflicts(ctx context.Context, pr *issues_model.PullRequest, gitRepo *
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// 8. Run the check command
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conflict = false
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err = git.NewCommand(gitRepo.Ctx, args...).
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Run(&git.RunOpts{
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Dir: tmpBasePath,
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Stderr: stderrWriter,
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PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
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// Close the writer end of the pipe to begin processing
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_ = stderrWriter.Close()
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defer func() {
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// Close the reader on return to terminate the git command if necessary
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_ = stderrReader.Close()
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}()
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err = cmdApply.Run(&git.RunOpts{
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Dir: tmpBasePath,
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Stderr: stderrWriter,
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PipelineFunc: func(ctx context.Context, cancel context.CancelFunc) error {
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// Close the writer end of the pipe to begin processing
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_ = stderrWriter.Close()
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defer func() {
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// Close the reader on return to terminate the git command if necessary
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_ = stderrReader.Close()
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}()
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const prefix = "error: patch failed:"
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const errorPrefix = "error: "
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const threewayFailed = "Failed to perform three-way merge..."
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const appliedPatchPrefix = "Applied patch to '"
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const withConflicts = "' with conflicts."
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const prefix = "error: patch failed:"
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const errorPrefix = "error: "
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const threewayFailed = "Failed to perform three-way merge..."
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const appliedPatchPrefix = "Applied patch to '"
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const withConflicts = "' with conflicts."
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conflicts := make(container.Set[string])
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conflicts := make(container.Set[string])
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// Now scan the output from the command
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scanner := bufio.NewScanner(stderrReader)
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for scanner.Scan() {
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line := scanner.Text()
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log.Trace("PullRequest[%d].testPatch: stderr: %s", pr.ID, line)
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if strings.HasPrefix(line, prefix) {
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conflict = true
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filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
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conflicts.Add(filepath)
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} else if is3way && line == threewayFailed {
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conflict = true
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} else if strings.HasPrefix(line, errorPrefix) {
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conflict = true
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for _, suffix := range patchErrorSuffices {
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if strings.HasSuffix(line, suffix) {
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filepath := strings.TrimSpace(strings.TrimSuffix(line[len(errorPrefix):], suffix))
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if filepath != "" {
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conflicts.Add(filepath)
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}
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break
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// Now scan the output from the command
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scanner := bufio.NewScanner(stderrReader)
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for scanner.Scan() {
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line := scanner.Text()
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log.Trace("PullRequest[%d].testPatch: stderr: %s", pr.ID, line)
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if strings.HasPrefix(line, prefix) {
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conflict = true
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filepath := strings.TrimSpace(strings.Split(line[len(prefix):], ":")[0])
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conflicts.Add(filepath)
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} else if is3way && line == threewayFailed {
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conflict = true
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} else if strings.HasPrefix(line, errorPrefix) {
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conflict = true
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for _, suffix := range patchErrorSuffices {
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if strings.HasSuffix(line, suffix) {
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filepath := strings.TrimSpace(strings.TrimSuffix(line[len(errorPrefix):], suffix))
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if filepath != "" {
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conflicts.Add(filepath)
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}
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}
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} else if is3way && strings.HasPrefix(line, appliedPatchPrefix) && strings.HasSuffix(line, withConflicts) {
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conflict = true
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filepath := strings.TrimPrefix(strings.TrimSuffix(line, withConflicts), appliedPatchPrefix)
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if filepath != "" {
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conflicts.Add(filepath)
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break
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}
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}
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// only list 10 conflicted files
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if len(conflicts) >= 10 {
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break
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} else if is3way && strings.HasPrefix(line, appliedPatchPrefix) && strings.HasSuffix(line, withConflicts) {
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conflict = true
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filepath := strings.TrimPrefix(strings.TrimSuffix(line, withConflicts), appliedPatchPrefix)
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if filepath != "" {
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conflicts.Add(filepath)
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}
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}
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if len(conflicts) > 0 {
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pr.ConflictedFiles = make([]string, 0, len(conflicts))
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for key := range conflicts {
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pr.ConflictedFiles = append(pr.ConflictedFiles, key)
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}
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// only list 10 conflicted files
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if len(conflicts) >= 10 {
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break
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}
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}
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return nil
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},
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})
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if len(conflicts) > 0 {
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pr.ConflictedFiles = make([]string, 0, len(conflicts))
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for key := range conflicts {
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pr.ConflictedFiles = append(pr.ConflictedFiles, key)
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}
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}
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return nil
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},
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})
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// 9. Check if the found conflictedfiles is non-zero, "err" could be non-nil, so we should ignore it if we found conflicts.
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// Note: `"err" could be non-nil` is due that if enable 3-way merge, it doesn't return any error on found conflicts.
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