Support .git-blame-ignore-revs file

modules/git/blame.go

@@ -10,6 +10,8 @@ import (
 	"io"
 	"os"
 	"regexp"
+
+	"code.gitea.io/gitea/modules/util"
 )
 
 // BlamePart represents block of blame - continuous lines with one sha
@@ -26,6 +28,11 @@ type BlameReader struct {
 	bufferedReader *bufio.Reader
 	done           chan error
 	lastSha        *string
+	ignoreRevsFile *os.File
+}
+
+func (r *BlameReader) UsesIgnoreRevs() bool {
+	return r.ignoreRevsFile != nil
 }
 
 var shaLineRegex = regexp.MustCompile("^([a-z0-9]{40})")
@@ -98,17 +105,32 @@ func (r *BlameReader) Close() error {
 	r.bufferedReader = nil
 	_ = r.reader.Close()
 	_ = r.output.Close()
+	if r.ignoreRevsFile != nil {
+		_ = util.Remove(r.ignoreRevsFile.Name())
+	}
 	return err
 }
 
 // CreateBlameReader creates reader for given repository, commit and file
-func CreateBlameReader(ctx context.Context, repoPath, commitID, file string) (*BlameReader, error) {
-	cmd := NewCommandContextNoGlobals(ctx, "blame", "--porcelain").
-		AddDynamicArguments(commitID).
+func CreateBlameReader(ctx context.Context, repoPath string, commit *Commit, file string, bypassBlameIgnore bool) (*BlameReader, error) {
+	cmd := NewCommandContextNoGlobals(ctx, "blame", "--porcelain")
+
+	var ignoreRevsFile *os.File
+	if !bypassBlameIgnore {
+		ignoreRevsFile = tryCreateBlameIgnoreRevsFile(commit)
+		if ignoreRevsFile != nil {
+			cmd.AddOptionValues("--ignore-revs-file", ignoreRevsFile.Name())
+		}
+	}
+
+	cmd.AddDynamicArguments(commit.ID.String()).
 		AddDashesAndList(file).
 		SetDescription(fmt.Sprintf("GetBlame [repo_path: %s]", repoPath))
 	reader, stdout, err := os.Pipe()
 	if err != nil {
+		if ignoreRevsFile != nil {
+			_ = util.Remove(ignoreRevsFile.Name())
+		}
 		return nil, err
 	}
 
@@ -134,5 +156,35 @@ func CreateBlameReader(ctx context.Context, repoPath, commitID, file string) (*B
 		reader:         reader,
 		bufferedReader: bufferedReader,
 		done:           done,
+		ignoreRevsFile: ignoreRevsFile,
 	}, nil
 }
+
+func tryCreateBlameIgnoreRevsFile(commit *Commit) *os.File {
+	entry, err := commit.GetTreeEntryByPath(".git-blame-ignore-revs")
+	if err != nil {
+		return nil
+	}
+
+	r, err := entry.Blob().DataAsync()
+	if err != nil {
+		return nil
+	}
+	defer r.Close()
+
+	f, err := os.CreateTemp("", "gitea_git-blame-ignore-revs")
+	if err != nil {
+		return nil
+	}
+	defer f.Close()
+
+	_, err = io.Copy(f, r)
+	if err != nil {
+		defer func() {
+			_ = util.Remove(f.Name())
+		}()
+		return nil
+	}
+
+	return f
+}

modules/git/blame_test.go

@@ -14,27 +14,127 @@ func TestReadingBlameOutput(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	blameReader, err := CreateBlameReader(ctx, "./tests/repos/repo5_pulls", "f32b0a9dfd09a60f616f29158f772cedd89942d2", "README.md")
-	assert.NoError(t, err)
-	defer blameReader.Close()
-
-	parts := []*BlamePart{
-		{
-			"72866af952e98d02a73003501836074b286a78f6",
-			[]string{
-				"# test_repo",
-				"Test repository for testing migration from github to gitea",
-			},
-		},
-		{
-			"f32b0a9dfd09a60f616f29158f772cedd89942d2",
-			[]string{"", "Do not make any changes to this repo it is used for unit testing"},
-		},
-	}
-
-	for _, part := range parts {
-		actualPart, err := blameReader.NextPart()
+	t.Run("Without .git-blame-ignore-revs", func(t *testing.T) {
+		repo, err := OpenRepository(ctx, "./tests/repos/repo5_pulls")
 		assert.NoError(t, err)
-		assert.Equal(t, part, actualPart)
-	}
+		defer repo.Close()
+
+		commit, err := repo.GetCommit("f32b0a9dfd09a60f616f29158f772cedd89942d2")
+		assert.NoError(t, err)
+
+		parts := []*BlamePart{
+			{
+				"72866af952e98d02a73003501836074b286a78f6",
+				[]string{
+					"# test_repo",
+					"Test repository for testing migration from github to gitea",
+				},
+			},
+			{
+				"f32b0a9dfd09a60f616f29158f772cedd89942d2",
+				[]string{"", "Do not make any changes to this repo it is used for unit testing"},
+			},
+		}
+
+		for _, bypass := range []bool{false, true} {
+			blameReader, err := CreateBlameReader(ctx, "./tests/repos/repo5_pulls", commit, "README.md", bypass)
+			assert.NoError(t, err)
+			assert.NotNil(t, blameReader)
+			defer blameReader.Close()
+
+			assert.False(t, blameReader.UsesIgnoreRevs())
+
+			for _, part := range parts {
+				actualPart, err := blameReader.NextPart()
+				assert.NoError(t, err)
+				assert.Equal(t, part, actualPart)
+			}
+
+			// make sure all parts have been read
+			actualPart, err := blameReader.NextPart()
+			assert.Nil(t, actualPart)
+			assert.NoError(t, err)
+		}
+	})
+
+	t.Run("With .git-blame-ignore-revs", func(t *testing.T) {
+		repo, err := OpenRepository(ctx, "./tests/repos/repo6_blame")
+		assert.NoError(t, err)
+		defer repo.Close()
+
+		full := []*BlamePart{
+			{
+				"af7486bd54cfc39eea97207ca666aa69c9d6df93",
+				[]string{"line", "line"},
+			},
+			{
+				"45fb6cbc12f970b04eacd5cd4165edd11c8d7376",
+				[]string{"changed line"},
+			},
+			{
+				"af7486bd54cfc39eea97207ca666aa69c9d6df93",
+				[]string{"line", "line", ""},
+			},
+		}
+
+		cases := []struct {
+			CommitID       string
+			UsesIgnoreRevs bool
+			Bypass         bool
+			Parts          []*BlamePart
+		}{
+			{
+				CommitID:       "544d8f7a3b15927cddf2299b4b562d6ebd71b6a7",
+				UsesIgnoreRevs: true,
+				Bypass:         false,
+				Parts: []*BlamePart{
+					{
+						"af7486bd54cfc39eea97207ca666aa69c9d6df93",
+						[]string{"line", "line", "changed line", "line", "line", ""},
+					},
+				},
+			},
+			{
+				CommitID:       "544d8f7a3b15927cddf2299b4b562d6ebd71b6a7",
+				UsesIgnoreRevs: false,
+				Bypass:         true,
+				Parts:          full,
+			},
+			{
+				CommitID:       "45fb6cbc12f970b04eacd5cd4165edd11c8d7376",
+				UsesIgnoreRevs: false,
+				Bypass:         false,
+				Parts:          full,
+			},
+			{
+				CommitID:       "45fb6cbc12f970b04eacd5cd4165edd11c8d7376",
+				UsesIgnoreRevs: false,
+				Bypass:         false,
+				Parts:          full,
+			},
+		}
+
+		for _, c := range cases {
+			commit, err := repo.GetCommit(c.CommitID)
+			assert.NoError(t, err)
+
+			blameReader, err := CreateBlameReader(ctx, "./tests/repos/repo6_blame", commit, "blame.txt", c.Bypass)
+			assert.NoError(t, err)
+			assert.NotNil(t, blameReader)
+			defer blameReader.Close()
+
+			assert.Equal(t, c.UsesIgnoreRevs, blameReader.UsesIgnoreRevs())
+
+			for _, part := range c.Parts {
+				actualPart, err := blameReader.NextPart()
+				assert.NoError(t, err)
+				assert.Equal(t, part, actualPart)
+			}
+
+			// make sure all parts have been read
+			actualPart, err := blameReader.NextPart()
+			assert.Nil(t, actualPart)
+			assert.NoError(t, err)
+		}
+	})
 }

modules/git/tests/repos/repo6_blame/HEAD

@@ -0,0 +1 @@
+ref: refs/heads/master

modules/git/tests/repos/repo6_blame/config

@@ -0,0 +1,4 @@
+[core]
+	repositoryformatversion = 0
+	filemode = true
+	bare = true

modules/git/tests/repos/repo6_blame/refs/heads/master

@@ -0,0 +1 @@
+544d8f7a3b15927cddf2299b4b562d6ebd71b6a7

options/locale/locale_en-US.ini

@@ -1002,6 +1002,7 @@ delete_preexisting = Delete pre-existing files
 delete_preexisting_content = Delete files in %s
 delete_preexisting_success = Deleted unadopted files in %s
 blame_prior = View blame prior to this change
+blame.ignore_revs = Ignoring revisions in .git-blame-ignore-revs.
 author_search_tooltip = Shows a maximum of 30 users
 
 transfer.accept = Accept Transfer

routers/web/repo/blame.go

@@ -10,7 +10,6 @@ import (
 	"net/url"
 	"strings"
 
-	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/charset"
 	"code.gitea.io/gitea/modules/context"
@@ -45,10 +44,6 @@ func RefBlame(ctx *context.Context) {
 		return
 	}
 
-	userName := ctx.Repo.Owner.Name
-	repoName := ctx.Repo.Repository.Name
-	commitID := ctx.Repo.CommitID
-
 	branchLink := ctx.Repo.RepoLink + "/src/" + ctx.Repo.BranchNameSubURL()
 	treeLink := branchLink
 	rawLink := ctx.Repo.RepoLink + "/raw/" + ctx.Repo.BranchNameSubURL()
@@ -101,13 +96,17 @@ func RefBlame(ctx *context.Context) {
 		return
 	}
 
-	blameReader, err := git.CreateBlameReader(ctx, repo_model.RepoPath(userName, repoName), commitID, fileName)
+	bypassBlameIgnore := ctx.FormString("bypass-blame-ignore") == "true"
+
+	blameReader, err := git.CreateBlameReader(ctx, ctx.Repo.Repository.RepoPath(), ctx.Repo.Commit, fileName, bypassBlameIgnore)
 	if err != nil {
 		ctx.NotFound("CreateBlameReader", err)
 		return
 	}
 	defer blameReader.Close()
 
+	ctx.Data["UsesIgnoreRevs"] = blameReader.UsesIgnoreRevs()
+
 	blameParts := make([]git.BlamePart, 0)
 
 	for {

templates/repo/blame.tmpl

@@ -1,3 +1,8 @@
+{{if .UsesIgnoreRevs}}
+<div class="ui info message">
+	<p><a href="{{.RepoLink}}/src/{{.BranchNameSubURL}}/.git-blame-ignore-revs">{{.locale.Tr "repo.blame.ignore_revs"}}</a></p>
+</div>
+{{end}}
 <div class="{{TabSizeClass .Editorconfig .FileName}} non-diff-file-content">
 	<h4 class="file-header ui top attached header gt-df gt-ac gt-sb gt-fw">
 		<div class="file-header-left gt-df gt-ac gt-py-3 gt-pr-4">