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>

1 files changed, 5 insertions, 5 deletions

diff --git a/services/mirror/mirror_pull.go b/services/mirror/mirror_pull.go
index 98e8d122a5..7dee90352e 100644
--- a/services/mirror/mirror_pull.go
+++ b/services/mirror/mirror_pull.go
@@ -203,11 +203,11 @@ func runSync(ctx context.Context, m *repo_model.Mirror) ([]*mirrorSyncResult, bo
 
 	log.Trace("SyncMirrors [repo: %-v]: running git remote update...", m.Repo)
 
-	gitArgs := []git.CmdArg{"remote", "update"}
+	cmd := git.NewCommand(ctx, "remote", "update")
 	if m.EnablePrune {
-		gitArgs = append(gitArgs, "--prune")
+		cmd.AddArguments("--prune")
 	}
-	gitArgs = append(gitArgs, git.CmdArgCheck(m.GetRemoteName()))
+	cmd.AddDynamicArguments(m.GetRemoteName())
 
 	remoteURL, remoteErr := git.GetRemoteURL(ctx, repoPath, m.GetRemoteName())
 	if remoteErr != nil {
@@ -217,7 +217,7 @@ func runSync(ctx context.Context, m *repo_model.Mirror) ([]*mirrorSyncResult, bo
 
 	stdoutBuilder := strings.Builder{}
 	stderrBuilder := strings.Builder{}
-	if err := git.NewCommand(ctx, gitArgs...).
+	if err := cmd.
 		SetDescription(fmt.Sprintf("Mirror.runSync: %s", m.Repo.FullName())).
 		Run(&git.RunOpts{
 			Timeout: timeout,
@@ -243,7 +243,7 @@ func runSync(ctx context.Context, m *repo_model.Mirror) ([]*mirrorSyncResult, bo
 				// Successful prune - reattempt mirror
 				stderrBuilder.Reset()
 				stdoutBuilder.Reset()
-				if err = git.NewCommand(ctx, gitArgs...).
+				if err = cmd.
 					SetDescription(fmt.Sprintf("Mirror.runSync: %s", m.Repo.FullName())).
 					Run(&git.RunOpts{
 						Timeout: timeout,