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// Copyright 2015 The Gogs Authors. All rights reserved.
// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package git
import (
"bytes"
"container/list"
"fmt"
"io"
"strconv"
"strings"
"time"
logger "code.gitea.io/gitea/modules/log"
)
// CompareInfo represents needed information for comparing references.
type CompareInfo struct {
MergeBase string
Commits *list.List
NumFiles int
}
// GetMergeBase checks and returns merge base of two branches and the reference used as base.
func (repo *Repository) GetMergeBase(tmpRemote string, base, head string) (string, string, error) {
if tmpRemote == "" {
tmpRemote = "origin"
}
if tmpRemote != "origin" {
tmpBaseName := "refs/remotes/" + tmpRemote + "/tmp_" + base
// Fetch commit into a temporary branch in order to be able to handle commits and tags
_, err := NewCommand("fetch", tmpRemote, base+":"+tmpBaseName).RunInDir(repo.Path)
if err == nil {
base = tmpBaseName
}
}
stdout, err := NewCommand("merge-base", "--", base, head).RunInDir(repo.Path)
return strings.TrimSpace(stdout), base, err
}
// GetCompareInfo generates and returns compare information between base and head branches of repositories.
func (repo *Repository) GetCompareInfo(basePath, baseBranch, headBranch string) (_ *CompareInfo, err error) {
var (
remoteBranch string
tmpRemote string
)
// We don't need a temporary remote for same repository.
if repo.Path != basePath {
// Add a temporary remote
tmpRemote = strconv.FormatInt(time.Now().UnixNano(), 10)
if err = repo.AddRemote(tmpRemote, basePath, false); err != nil {
return nil, fmt.Errorf("AddRemote: %v", err)
}
defer func() {
if err := repo.RemoveRemote(tmpRemote); err != nil {
logger.Error("GetPullRequestInfo: RemoveRemote: %v", err)
}
}()
}
compareInfo := new(CompareInfo)
compareInfo.MergeBase, remoteBranch, err = repo.GetMergeBase(tmpRemote, baseBranch, headBranch)
if err == nil {
// We have a common base - therefore we know that ... should work
logs, err := NewCommand("log", compareInfo.MergeBase+"..."+headBranch, prettyLogFormat).RunInDirBytes(repo.Path)
if err != nil {
return nil, err
}
compareInfo.Commits, err = repo.parsePrettyFormatLogToList(logs)
if err != nil {
return nil, fmt.Errorf("parsePrettyFormatLogToList: %v", err)
}
} else {
compareInfo.Commits = list.New()
compareInfo.MergeBase, err = GetFullCommitID(repo.Path, remoteBranch)
if err != nil {
compareInfo.MergeBase = remoteBranch
}
}
// Count number of changed files.
stdout, err := NewCommand("diff", "--name-only", remoteBranch+"..."+headBranch).RunInDir(repo.Path)
if err != nil && strings.Contains(err.Error(), "no merge base") {
// git >= 2.28 now returns an error if base and head have become unrelated.
// previously it would return the results of git diff --name-only base head so let's try that...
stdout, err = NewCommand("diff", "--name-only", remoteBranch, headBranch).RunInDir(repo.Path)
}
if err != nil {
return nil, err
}
compareInfo.NumFiles = len(strings.Split(stdout, "\n")) - 1
return compareInfo, nil
}
// GetDiffOrPatch generates either diff or formatted patch data between given revisions
func (repo *Repository) GetDiffOrPatch(base, head string, w io.Writer, formatted bool) error {
if formatted {
return repo.GetPatch(base, head, w)
}
return repo.GetDiff(base, head, w)
}
// GetDiff generates and returns patch data between given revisions.
func (repo *Repository) GetDiff(base, head string, w io.Writer) error {
return NewCommand("diff", "-p", "--binary", base, head).
RunInDirPipeline(repo.Path, w, nil)
}
// GetPatch generates and returns format-patch data between given revisions.
func (repo *Repository) GetPatch(base, head string, w io.Writer) error {
stderr := new(bytes.Buffer)
err := NewCommand("format-patch", "--binary", "--stdout", base+"..."+head).
RunInDirPipeline(repo.Path, w, stderr)
if err != nil && bytes.Contains(stderr.Bytes(), []byte("no merge base")) {
return NewCommand("format-patch", "--binary", "--stdout", base, head).
RunInDirPipeline(repo.Path, w, nil)
}
return err
}
// GetDiffFromMergeBase generates and return patch data from merge base to head
func (repo *Repository) GetDiffFromMergeBase(base, head string, w io.Writer) error {
stderr := new(bytes.Buffer)
err := NewCommand("diff", "-p", "--binary", base+"..."+head).
RunInDirPipeline(repo.Path, w, stderr)
if err != nil && bytes.Contains(stderr.Bytes(), []byte("no merge base")) {
return NewCommand("diff", "-p", "--binary", base, head).
RunInDirPipeline(repo.Path, w, nil)
}
return err
}
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