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Refactor git command package to improve security and maintainability (#22678)

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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 2023-02-04 10:30:43 +08:00 • committed by GitHub
parent 3c5655ce18
commit 6bc3079c00
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GPG key ID: 4AEE18F83AFDEB23
42 changed files with 382 additions and 385 deletions
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14
modules/git/repo_compare.go
View file

@ -172,25 +172,21 @@ func (repo *Repository) GetDiffNumChangedFiles(base, head string, directComparis
// GetDiffShortStat counts number of changed files, number of additions and deletions
func (repo *Repository) GetDiffShortStat(base, head string) (numFiles, totalAdditions, totalDeletions int, err error) {
numFiles, totalAdditions, totalDeletions, err = GetDiffShortStat(repo.Ctx, repo.Path, CmdArgCheck(base+"..."+head))
numFiles, totalAdditions, totalDeletions, err = GetDiffShortStat(repo.Ctx, repo.Path, nil, base+"..."+head)
if err != nil && strings.Contains(err.Error(), "no merge base") {
return GetDiffShortStat(repo.Ctx, repo.Path, CmdArgCheck(base), CmdArgCheck(head))
return GetDiffShortStat(repo.Ctx, repo.Path, nil, base, head)
}
return numFiles, totalAdditions, totalDeletions, err
}
// GetDiffShortStat counts number of changed files, number of additions and deletions
func GetDiffShortStat(ctx context.Context, repoPath string, args ...CmdArg) (numFiles, totalAdditions, totalDeletions int, err error) {
func GetDiffShortStat(ctx context.Context, repoPath string, trustedArgs TrustedCmdArgs, dynamicArgs ...string) (numFiles, totalAdditions, totalDeletions int, err error) {
// Now if we call:
// $ git diff --shortstat 1ebb35b98889ff77299f24d82da426b434b0cca0...788b8b1440462d477f45b0088875
// we get:
// " 9902 files changed, 2034198 insertions(+), 298800 deletions(-)\n"
args = append([]CmdArg{
"diff",
"--shortstat",
}, args...)
stdout, _, err := NewCommand(ctx, args...).RunStdString(&RunOpts{Dir: repoPath})
cmd := NewCommand(ctx, "diff", "--shortstat").AddArguments(trustedArgs...).AddDynamicArguments(dynamicArgs...)
stdout, _, err := cmd.RunStdString(&RunOpts{Dir: repoPath})
if err != nil {
return 0, 0, 0, err
}