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forgejo/modules/git/repo_archive.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

75 lines
1.5 KiB
Go

// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2020 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"context"
"fmt"
"io"
"path/filepath"
"strings"
)
// ArchiveType archive types
type ArchiveType int
const (
// ZIP zip archive type
ZIP ArchiveType = iota + 1
// TARGZ tar gz archive type
TARGZ
// BUNDLE bundle archive type
BUNDLE
)
// String converts an ArchiveType to string
func (a ArchiveType) String() string {
switch a {
case ZIP:
return "zip"
case TARGZ:
return "tar.gz"
case BUNDLE:
return "bundle"
}
return "unknown"
}
func ToArchiveType(s string) ArchiveType {
switch s {
case "zip":
return ZIP
case "tar.gz":
return TARGZ
case "bundle":
return BUNDLE
}
return 0
}
// CreateArchive create archive content to the target path
func (repo *Repository) CreateArchive(ctx context.Context, format ArchiveType, target io.Writer, usePrefix bool, commitID string) error {
if format.String() == "unknown" {
return fmt.Errorf("unknown format: %v", format)
}
cmd := NewCommand(ctx, "archive")
if usePrefix {
cmd.AddOptionFormat("--prefix=%s", filepath.Base(strings.TrimSuffix(repo.Path, ".git"))+"/")
}
cmd.AddOptionFormat("--format=%s", format.String())
cmd.AddDynamicArguments(commitID)
var stderr strings.Builder
err := cmd.Run(&RunOpts{
Dir: repo.Path,
Stdout: target,
Stderr: &stderr,
})
if err != nil {
return ConcatenateError(err, stderr.String())
}
return nil
}