forgejo/modules/git/command_test.go
wxiaoguang 6bc3079c00
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>
2023-02-04 10:30:43 +08:00

54 lines
1.6 KiB
Go

// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"context"
"testing"
"github.com/stretchr/testify/assert"
)
func TestRunWithContextStd(t *testing.T) {
cmd := NewCommand(context.Background(), "--version")
stdout, stderr, err := cmd.RunStdString(&RunOpts{})
assert.NoError(t, err)
assert.Empty(t, stderr)
assert.Contains(t, stdout, "git version")
cmd = NewCommand(context.Background(), "--no-such-arg")
stdout, stderr, err = cmd.RunStdString(&RunOpts{})
if assert.Error(t, err) {
assert.Equal(t, stderr, err.Stderr())
assert.Contains(t, err.Stderr(), "unknown option:")
assert.Contains(t, err.Error(), "exit status 129 - unknown option:")
assert.Empty(t, stdout)
}
cmd = NewCommand(context.Background())
cmd.AddDynamicArguments("-test")
assert.ErrorIs(t, cmd.Run(&RunOpts{}), ErrBrokenCommand)
cmd = NewCommand(context.Background())
cmd.AddDynamicArguments("--test")
assert.ErrorIs(t, cmd.Run(&RunOpts{}), ErrBrokenCommand)
subCmd := "version"
cmd = NewCommand(context.Background()).AddDynamicArguments(subCmd) // for test purpose only, the sub-command should never be dynamic for production
stdout, stderr, err = cmd.RunStdString(&RunOpts{})
assert.NoError(t, err)
assert.Empty(t, stderr)
assert.Contains(t, stdout, "git version")
}
func TestGitArgument(t *testing.T) {
assert.True(t, isValidArgumentOption("-x"))
assert.True(t, isValidArgumentOption("--xx"))
assert.False(t, isValidArgumentOption(""))
assert.False(t, isValidArgumentOption("x"))
assert.True(t, isSafeArgumentValue(""))
assert.True(t, isSafeArgumentValue("x"))
assert.False(t, isSafeArgumentValue("-x"))
}