repository: GetFileAttributes supports get all attributes for a pathej/5772/GetFileAttributes-get-all-attributes-for-a-path

During the processing of replacing GetInfoAttributes by
GitFileAttributes in Rails.We come across a function, attributes(path)
in lib/gitlab/git/repository.rb. It queries all the attributes
for a given path.

This MR add the ability to query all the attributes for a given path.

2 files changed, 46 insertions, 12 deletions

diff --git a/internal/git/gitattributes/check_attr.go b/internal/git/gitattributes/check_attr.go
index 8596efaa3..f8e1bb232 100644
--- a/internal/git/gitattributes/check_attr.go
+++ b/internal/git/gitattributes/check_attr.go
@@ -20,8 +20,6 @@ type CheckAttrCmd struct {
 	stdout *bufio.Reader
 	stdin  *bufio.Writer
 
-	count int
-
 	m *sync.Mutex
 }
 
@@ -31,14 +29,22 @@ func CheckAttr(ctx context.Context, repo git.RepositoryExecutor, revision git.Re
 		return nil, nil, structerr.NewInvalidArgument("empty list of attribute names")
 	}
 
+	flags := []git.Option{
+		git.Flag{Name: "--stdin"},
+		git.Flag{Name: "-z"},
+		git.ValueFlag{Name: "--source", Value: revision.String()},
+	}
+
+	// Special attribute "*" retrieves all attributes
+	if len(names) == 1 && names[0] == "*" {
+		flags = append(flags, git.Flag{Name: "-a"})
+		names = nil
+	}
+
 	cmd, err := repo.Exec(ctx, git.Command{
-		Name: "check-attr",
-		Flags: []git.Option{
-			git.Flag{Name: "--stdin"},
-			git.Flag{Name: "-z"},
-			git.ValueFlag{Name: "--source", Value: revision.String()},
-		},
-		Args: names,
+		Name:  "check-attr",
+		Flags: flags,
+		Args:  names,
 	},
 		git.WithSetupStdin(),
 		git.WithSetupStdout(),
@@ -51,7 +57,6 @@ func CheckAttr(ctx context.Context, repo git.RepositoryExecutor, revision git.Re
 		cmd:    cmd,
 		stdout: bufio.NewReader(cmd),
 		stdin:  bufio.NewWriter(cmd),
-		count:  len(names),
 		m:      &sync.Mutex{},
 	}
 
@@ -79,7 +84,7 @@ func (c CheckAttrCmd) Check(path string) (Attributes, error) {
 
 	// Using git-check-attr(1) with -z will return data in the format:
 	// <path> NUL <attribute> NUL <info> NUL ...
-	for i := 0; i < c.count; {
+	for {
 		word, err := c.stdout.ReadBytes('\000')
 		if err != nil {
 			return nil, fmt.Errorf("read line: %w", err)
@@ -98,8 +103,10 @@ func (c CheckAttrCmd) Check(path string) (Attributes, error) {
 			attrs = append(attrs, Attribute{Name: buf[1], State: buf[2]})
 		}
 
-		i++
 		buf = buf[:0]
+		if c.stdout.Buffered() == 0 {
+			break
+		}
 	}
 
 	return attrs, nil
diff --git a/internal/gitaly/service/repository/file_attributes_test.go b/internal/gitaly/service/repository/file_attributes_test.go
index 747263437..4d55c36ea 100644
--- a/internal/gitaly/service/repository/file_attributes_test.go
+++ b/internal/gitaly/service/repository/file_attributes_test.go
@@ -94,6 +94,33 @@ func TestGetFileAttributes(t *testing.T) {
 			},
 		},
 		{
+			desc: "returns multiple attributes for a file successfully",
+			setup: func(t *testing.T) setupData {
+				return setupData{
+					request: &gitalypb.GetFileAttributesRequest{
+						Repository: repoProto,
+						Revision:   []byte("main"),
+						Attributes: []string{"*"},
+						Paths:      []string{"example.go"},
+					},
+					expectedResponse: &gitalypb.GetFileAttributesResponse{
+						AttributeInfos: []*gitalypb.GetFileAttributesResponse_AttributeInfo{
+							{
+								Path:      string("example.go"),
+								Attribute: string("diff"),
+								Value:     string("go"),
+							},
+							{
+								Path:      string("example.go"),
+								Attribute: string("text"),
+								Value:     string("set"),
+							},
+						},
+					},
+				}
+			},
+		},
+		{
 			desc: "returns empty response when there are no matching attributes for the given path",
 			setup: func(t *testing.T) setupData {
 				return setupData{