初始提交: Gitea 项目代码

2026-05-30 22:47:36 +08:00
commit f288f76350
6116 changed files with 776822 additions and 0 deletions
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+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"bufio"
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"gitea.dev/modules/git/gitcmd"
+)
+
+type lineCountWriter struct {
+	numLines int
+}
+
+// Write counts the number of newlines in the provided bytestream
+func (l *lineCountWriter) Write(p []byte) (n int, err error) {
+	n = len(p)
+	l.numLines += bytes.Count(p, []byte{'\000'})
+	return n, err
+}
+
+// GetDiffNumChangedFiles counts the number of changed files
+// This is substantially quicker than shortstat but...
+func (repo *Repository) GetDiffNumChangedFiles(base, head string, directComparison bool) (int, error) {
+	// Now there is git diff --shortstat but this appears to be slower than simply iterating with --nameonly
+	w := &lineCountWriter{}
+
+	separator := "..."
+	if directComparison {
+		separator = ".."
+	}
+
+	// avoid: ambiguous argument 'refs/a...refs/b': unknown revision or path not in the working tree. Use '--': 'git <command> [<revision>...] -- [<file>...]'
+	if err := gitcmd.NewCommand("diff", "-z", "--name-only").
+		AddDynamicArguments(base + separator + head).
+		AddArguments("--").
+		WithDir(repo.Path).
+		WithStdoutCopy(w).
+		RunWithStderr(repo.Ctx); err != nil {
+		if strings.Contains(err.Stderr(), "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 -z --name-only base head so let's try that...
+			w = &lineCountWriter{}
+			if err = gitcmd.NewCommand("diff", "-z", "--name-only").
+				AddDynamicArguments(base, head).
+				AddArguments("--").
+				WithDir(repo.Path).
+				WithStdoutCopy(w).
+				RunWithStderr(repo.Ctx); err == nil {
+				return w.numLines, nil
+			}
+		}
+		return 0, err
+	}
+	return w.numLines, nil
+}
+
+var patchCommits = regexp.MustCompile(`^From\s(\w+)\s`)
+
+// GetDiff generates and returns patch data between given revisions, optimized for human readability
+func (repo *Repository) GetDiff(compareArg string, w io.Writer) error {
+	return gitcmd.NewCommand("diff", "-p").AddDynamicArguments(compareArg).
+		WithDir(repo.Path).
+		WithStdoutCopy(w).
+		Run(repo.Ctx)
+}
+
+// GetDiffBinary generates and returns patch data between given revisions, including binary diffs.
+func (repo *Repository) GetDiffBinary(compareArg string, w io.Writer) error {
+	return gitcmd.NewCommand("diff", "-p", "--binary", "--histogram").
+		AddDynamicArguments(compareArg).
+		WithDir(repo.Path).
+		WithStdoutCopy(w).
+		Run(repo.Ctx)
+}
+
+// GetPatch generates and returns format-patch data between given revisions, able to be used with `git apply`
+func (repo *Repository) GetPatch(compareArg string, w io.Writer) error {
+	return gitcmd.NewCommand("format-patch", "--binary", "--stdout").AddDynamicArguments(compareArg).
+		WithDir(repo.Path).
+		WithStdoutCopy(w).
+		Run(repo.Ctx)
+}
+
+// GetFilesChangedBetween returns a list of all files that have been changed between the given commits
+// If base is undefined empty SHA (zeros), it only returns the files changed in the head commit
+// If base is the SHA of an empty tree (EmptyTreeSHA), it returns the files changes from the initial commit to the head commit
+func (repo *Repository) GetFilesChangedBetween(base, head string) ([]string, error) {
+	objectFormat, err := repo.GetObjectFormat()
+	if err != nil {
+		return nil, err
+	}
+	cmd := gitcmd.NewCommand("diff-tree", "--name-only", "--root", "--no-commit-id", "-r", "-z")
+	if base == objectFormat.EmptyObjectID().String() {
+		cmd.AddDynamicArguments(head)
+	} else {
+		cmd.AddDynamicArguments(base, head)
+	}
+	stdout, _, err := cmd.WithDir(repo.Path).RunStdString(repo.Ctx)
+	if err != nil {
+		return nil, err
+	}
+	split := strings.Split(stdout, "\000")
+
+	// Because Git will always emit filenames with a terminal NUL ignore the last entry in the split - which will always be empty.
+	if len(split) > 0 {
+		split = split[:len(split)-1]
+	}
+
+	return split, err
+}
+
+// ReadPatchCommit will check if a diff patch exists and return stats
+func (repo *Repository) ReadPatchCommit(prID int64) (commitSHA string, err error) {
+	// Migrated repositories download patches to "pulls" location
+	patchFile := fmt.Sprintf("pulls/%d.patch", prID)
+	loadPatch, err := os.Open(filepath.Join(repo.Path, patchFile))
+	if err != nil {
+		return "", err
+	}
+	defer loadPatch.Close()
+	// Read only the first line of the patch - usually it contains the first commit made in patch
+	scanner := bufio.NewScanner(loadPatch)
+	scanner.Scan()
+	// Parse the Patch stats, sometimes Migration returns a 404 for the patch file
+	commitSHAGroups := patchCommits.FindStringSubmatch(scanner.Text())
+	if len(commitSHAGroups) != 0 {
+		commitSHA = commitSHAGroups[1]
+	} else {
+		return "", errors.New("patch file doesn't contain valid commit ID")
+	}
+	return commitSHA, nil
+}