Merge branch 'add-tags-updated-to-fetch-remote' into 'master'

Add information about whether tags were updated to the FetchRemote RPC

See merge request gitlab-org/gitaly!2901

10 files changed, 640 insertions, 224 deletions

diff --git a/changelogs/unreleased/add-tags-updated-to-fetch-remote.yml b/changelogs/unreleased/add-tags-updated-to-fetch-remote.yml
new file mode 100644
index 000000000..e9d49641b
--- /dev/null
+++ b/changelogs/unreleased/add-tags-updated-to-fetch-remote.yml
@@ -0,0 +1,5 @@
+---
+title: Add information about whether tags were updated to the FetchRemote RPC
+merge_request: 2901
+author:
+type: added
diff --git a/internal/git/fetch_scanner.go b/internal/git/fetch_scanner.go
new file mode 100644
index 000000000..eb05df0eb
--- /dev/null
+++ b/internal/git/fetch_scanner.go
@@ -0,0 +1,193 @@
+package git
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"strings"
+)
+
+// RefUpdateType represents the type of update a FetchStatusLine is. The
+// valid types are documented here: https://git-scm.com/docs/git-fetch/2.30.0#Documentation/git-fetch.txt-flag
+type RefUpdateType byte
+
+// Valid checks whether the RefUpdateType is one of the seven valid types of update
+func (t RefUpdateType) Valid() bool {
+	_, ok := validRefUpdateTypes[t]
+
+	return ok
+}
+
+// FetchStatusLine represents a line of status output from `git fetch`, as
+// documented here: https://git-scm.com/docs/git-fetch/2.30.0#_output. Each
+// line is a change to a git reference in the local repository that was caused
+// by the fetch
+type FetchStatusLine struct {
+	// Type encodes the kind of change that git fetch has made
+	Type RefUpdateType
+	// Summary is a brief description of the change. This may be text such as
+	// [new tag], or a compact-form SHA range showing the old and new values of
+	// the updated reference, depending on the type of update
+	Summary string
+	// From is usually the name of the remote ref being fetched from, missing
+	// the refs/<type>/ prefix. If a ref is being deleted, this will be "(none)"
+	From string
+	// To is the name of the local ref being updated, missing the refs/<type>/
+	// prefix.
+	To string
+	// Reason optionally contains human-readable information about the change. It
+	// is typically used to explain why making a given change failed (e.g., the
+	// type will be RefUpdateTypeUpdateFailed). It may be empty.
+	Reason string
+}
+
+const (
+	// RefUpdateTypeFastForwardUpdate represents a 'fast forward update' fetch status line
+	RefUpdateTypeFastForwardUpdate RefUpdateType = ' '
+	// RefUpdateTypeForcedUpdate represents a 'forced update' fetch status line
+	RefUpdateTypeForcedUpdate RefUpdateType = '+'
+	// RefUpdateTypePruned represents a 'pruned' fetch status line
+	RefUpdateTypePruned RefUpdateType = '-'
+	// RefUpdateTypeTagUpdate represents a 'tag update' fetch status line
+	RefUpdateTypeTagUpdate RefUpdateType = 't'
+	// RefUpdateTypeFetched represents a 'fetched' fetch status line. This
+	// indicates that a new reference has been created in the local repository
+	RefUpdateTypeFetched RefUpdateType = '*'
+	// RefUpdateTypeUpdateFailed represents an 'update failed' fetch status line
+	RefUpdateTypeUpdateFailed RefUpdateType = '!'
+	// RefUpdateTypeUnchanged represents an 'unchanged' fetch status line
+	RefUpdateTypeUnchanged RefUpdateType = '='
+)
+
+var (
+	validRefUpdateTypes = map[RefUpdateType]struct{}{
+		RefUpdateTypeFastForwardUpdate: {},
+		RefUpdateTypeForcedUpdate:      {},
+		RefUpdateTypePruned:            {},
+		RefUpdateTypeTagUpdate:         {},
+		RefUpdateTypeFetched:           {},
+		RefUpdateTypeUpdateFailed:      {},
+		RefUpdateTypeUnchanged:         {},
+	}
+)
+
+// IsTagAdded returns true if this status line indicates a new tag was added
+func (f FetchStatusLine) IsTagAdded() bool {
+	return f.Type == RefUpdateTypeFetched && f.Summary == "[new tag]"
+}
+
+// IsTagUpdated returns true if this status line indicates a tag was changed
+func (f FetchStatusLine) IsTagUpdated() bool {
+	return f.Type == RefUpdateTypeTagUpdate
+}
+
+// FetchScanner scans the output of `git fetch`, allowing information about
+// the updated refs to be gathered
+type FetchScanner struct {
+	scanner  *bufio.Scanner
+	lastLine FetchStatusLine
+}
+
+// NewFetchScanner returns a new FetchScanner
+func NewFetchScanner(r io.Reader) *FetchScanner {
+	return &FetchScanner{scanner: bufio.NewScanner(r)}
+}
+
+// Scan looks for the next fetch status line in the reader supplied to
+// NewFetchScanner(). Any lines that are not valid status lines are discarded
+// without error. It returns true if you should call Scan() again, and false if
+// scanning has come to an end.
+func (f *FetchScanner) Scan() bool {
+	for f.scanner.Scan() {
+		// Silently ignore non-matching lines
+		line, ok := parseFetchStatusLine(f.scanner.Bytes())
+		if !ok {
+			continue
+		}
+
+		f.lastLine = line
+		return true
+	}
+
+	return false
+}
+
+// Err returns any error encountered while scanning the reader supplied to
+// NewFetchScanner(). Note that lines not matching the expected format are not
+// an error.
+func (f *FetchScanner) Err() error {
+	return f.scanner.Err()
+}
+
+// StatusLine returns the most recent fetch status line encountered by the
+// FetchScanner. It changes after each call to Scan(), unless there is an error.
+func (f *FetchScanner) StatusLine() FetchStatusLine {
+	return f.lastLine
+}
+
+// parseFetchStatusLine parses lines outputted by git-fetch(1), which are expected
+// to be in the format " <flag> <summary> <from> -> <to> [<reason>]"
+func parseFetchStatusLine(line []byte) (FetchStatusLine, bool) {
+	var blank FetchStatusLine
+	var out FetchStatusLine
+
+	// Handle the flag very strictly, since status and non-status text mingle
+	if len(line) < 4 || line[0] != ' ' || line[2] != ' ' {
+		return blank, false
+	}
+
+	out.Type, line = RefUpdateType(line[1]), line[3:]
+	if !out.Type.Valid() {
+		return blank, false
+	}
+
+	// Get the summary, which may be composed of multiple words
+	if line[0] == '[' {
+		end := bytes.IndexByte(line, ']')
+		if end < 0 || len(line) <= end+2 {
+			return blank, false
+		}
+
+		out.Summary, line = string(line[0:end+1]), line[end+1:]
+	} else {
+		end := bytes.IndexByte(line, ' ')
+		if end < 0 || len(line) <= end+1 {
+			return blank, false
+		}
+
+		out.Summary, line = string(line[0:end]), line[end:]
+	}
+
+	// We're now scanning the "<from> -> <to>" part, where "<from>" is the remote branch name
+	// while "<to>" is the local branch name transformed by the refspec. As branches cannot
+	// contain whitespace, it's fine to scan by word now.
+	scanner := bufio.NewScanner(bytes.NewReader(line))
+	scanner.Split(bufio.ScanWords)
+
+	// From field
+	if !scanner.Scan() {
+		return blank, false
+	}
+	out.From = scanner.Text()
+
+	// Hardcoded -> delimiter
+	if !scanner.Scan() || !bytes.Equal(scanner.Bytes(), []byte("->")) {
+		return blank, false
+	}
+
+	// To field
+	if !scanner.Scan() {
+		return blank, false
+	}
+	out.To = scanner.Text()
+
+	// Reason field - optional, the rest of the line. This implementation will
+	// squeeze multiple spaces into one, but that shouldn't be a big problem
+	var reason []string
+	for scanner.Scan() {
+		reason = append(reason, scanner.Text())
+	}
+	out.Reason = strings.Join(reason, " ")
+
+	return out, true
+}
diff --git a/internal/git/fetch_scanner_test.go b/internal/git/fetch_scanner_test.go
new file mode 100644
index 000000000..d49feda93
--- /dev/null
+++ b/internal/git/fetch_scanner_test.go
@@ -0,0 +1,133 @@
+package git
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestFetchScannerScan(t *testing.T) {
+	blank := FetchStatusLine{}
+
+	for _, tc := range []struct {
+		desc         string
+		data         string
+		expected     FetchStatusLine
+		success      bool
+		isTagAdded   bool
+		isTagUpdated bool
+	}{
+		{
+			desc:     "empty line",
+			data:     "",
+			expected: blank,
+		},
+		{
+			desc:     "blank line",
+			data:     "    ",
+			expected: blank,
+		},
+		{
+			desc:     "line with a false-positive type",
+			data:     "****",
+			expected: blank,
+		},
+		{
+			desc:     "line missing initial whitespace",
+			data:     "* [new branch]          foo         -> upstream/foo",
+			expected: blank,
+		},
+		{
+			desc:     "summary field with spaces missing closing square bracket",
+			data:     " * [new branch          foo     -> upstream/foo",
+			expected: blank,
+		},
+		{
+			desc:     "missing delimiter between from and to fields (no reason field)",
+			data:     "* [new branch]          foo    upstream/foo",
+			expected: blank,
+		},
+		{
+			desc:     "missing delimiter between from and to fields (with reason field)",
+			data:     " * [new branch]          foo    upstream/foo (some reason)",
+			expected: blank,
+		},
+		{
+			desc:     "invalid type with otherwise OK line",
+			data:     " ~ [new branch]          foo         -> upstream/foo",
+			expected: blank,
+		},
+
+		{
+			desc:     "valid fetch line (ASCII reference)",
+			data:     " * [new branch]          foo         -> upstream/foo",
+			expected: FetchStatusLine{RefUpdateTypeFetched, "[new branch]", "foo", "upstream/foo", ""},
+			success:  true,
+		},
+		{
+			desc:     "valid fetch line (UTF-8 reference)",
+			data:     " * [new branch]          面         -> upstream/面",
+			expected: FetchStatusLine{RefUpdateTypeFetched, "[new branch]", "面", "upstream/面", ""},
+			success:  true,
+		},
+		{
+			desc:       "valid fetch line (new tag)",
+			data:       " * [new tag]             v13.7.0-rc1                             -> v13.7.0-rc1",
+			expected:   FetchStatusLine{RefUpdateTypeFetched, "[new tag]", "v13.7.0-rc1", "v13.7.0-rc1", ""},
+			success:    true,
+			isTagAdded: true,
+		},
+		{
+			desc:     "valid forced-update line",
+			data:     " + d8b96a36c...d2a598d09 cgroups-impl                            -> upstream/cgroups-impl  (forced update)",
+			expected: FetchStatusLine{RefUpdateTypeForcedUpdate, "d8b96a36c...d2a598d09", "cgroups-impl", "upstream/cgroups-impl", "(forced update)"},
+			success:  true,
+		},
+		{
+			desc:     "valid fast-forward update line",
+			data:     "   87daf9d2e..1504b30e1  master                       -> upstream/master",
+			expected: FetchStatusLine{RefUpdateTypeFastForwardUpdate, "87daf9d2e..1504b30e1", "master", "upstream/master", ""},
+			success:  true,
+		},
+		{
+			desc:     "valid prune line (branch reference)",
+			data:     " - [deleted]                 (none)     -> upstream/foo",
+			expected: FetchStatusLine{RefUpdateTypePruned, "[deleted]", "(none)", "upstream/foo", ""},
+			success:  true,
+		},
+		{
+			desc:     "valid prune line (tag reference)",
+			data:     " - [deleted]         (none)     -> v1.2.3",
+			expected: FetchStatusLine{RefUpdateTypePruned, "[deleted]", "(none)", "v1.2.3", ""},
+			success:  true,
+		},
+		{
+			desc:         "valid tag update line",
+			data:         " t [tag update]                 v1.2.3     -> v1.2.3",
+			expected:     FetchStatusLine{RefUpdateTypeTagUpdate, "[tag update]", "v1.2.3", "v1.2.3", ""},
+			success:      true,
+			isTagUpdated: true,
+		},
+		{
+			desc:     "valid update failed line",
+			data:     " ! d8b96a36c...d2a598d09                 foo     -> upstream/foo  (update hook failed)",
+			expected: FetchStatusLine{RefUpdateTypeUpdateFailed, "d8b96a36c...d2a598d09", "foo", "upstream/foo", "(update hook failed)"},
+			success:  true,
+		},
+		{
+			desc:     "valid unchanged line",
+			data:     " = [up to date]                 foo     -> upstream/foo",
+			expected: FetchStatusLine{RefUpdateTypeUnchanged, "[up to date]", "foo", "upstream/foo", ""},
+			success:  true,
+		},
+	} {
+		t.Run(tc.desc, func(t *testing.T) {
+			scanner := NewFetchScanner(strings.NewReader(tc.data))
+			require.Equal(t, tc.success, scanner.Scan())
+			require.Equal(t, tc.expected, scanner.StatusLine())
+			require.Equal(t, tc.isTagAdded, scanner.StatusLine().IsTagAdded())
+			require.Equal(t, tc.isTagUpdated, scanner.StatusLine().IsTagUpdated())
+		})
+	}
+}
diff --git a/internal/git/repository.go b/internal/git/repository.go
index 558831e09..6c9d08eb3 100644
--- a/internal/git/repository.go
+++ b/internal/git/repository.go
@@ -65,6 +65,11 @@ type FetchOpts struct {
 	// doesn't have the previous commit as an ancestor.
 	// https://git-scm.com/docs/git-fetch#Documentation/git-fetch.txt---force
 	Force bool
+	// Verbose controls how much information is written to stderr. The list of
+	// refs updated by the fetch will only be listed if verbose is true.
+	// https://git-scm.com/docs/git-fetch#Documentation/git-fetch.txt---quiet
+	// https://git-scm.com/docs/git-fetch#Documentation/git-fetch.txt---verbose
+	Verbose bool
 	// Tags controls whether tags will be fetched as part of the remote or not.
 	// https://git-scm.com/docs/git-fetch#Documentation/git-fetch.txt---tags
 	// https://git-scm.com/docs/git-fetch#Documentation/git-fetch.txt---no-tags
@@ -74,7 +79,11 @@ type FetchOpts struct {
 }
 
 func (opts FetchOpts) buildFlags() []Option {
-	flags := []Option{Flag{Name: "--quiet"}}
+	flags := []Option{}
+
+	if !opts.Verbose {
+		flags = append(flags, Flag{Name: "--quiet"})
+	}
 
 	if opts.Prune {
 		flags = append(flags, Flag{Name: "--prune"})
diff --git a/internal/gitaly/service/repository/fetch_remote.go b/internal/gitaly/service/repository/fetch_remote.go
index f443bffee..486feb106 100644
--- a/internal/gitaly/service/repository/fetch_remote.go
+++ b/internal/gitaly/service/repository/fetch_remote.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"net/url"
 	"os"
@@ -62,7 +63,7 @@ func (s *server) FetchRemote(ctx context.Context, req *gitalypb.FetchRemoteReque
 	}
 
 	var stderr bytes.Buffer
-	opts := git.FetchOpts{Stderr: &stderr, Force: req.Force, Prune: true, Tags: git.FetchOptsTagsAll}
+	opts := git.FetchOpts{Stderr: &stderr, Force: req.Force, Prune: true, Tags: git.FetchOptsTagsAll, Verbose: req.GetCheckTagsChanged()}
 
 	if req.GetNoTags() {
 		opts.Tags = git.FetchOptsTagsNone
@@ -177,7 +178,29 @@ func (s *server) FetchRemote(ctx context.Context, req *gitalypb.FetchRemoteReque
 		return nil, fmt.Errorf("fetch remote: %w", err)
 	}
 
-	return &gitalypb.FetchRemoteResponse{}, nil
+	out := &gitalypb.FetchRemoteResponse{TagsChanged: true}
+	if req.GetCheckTagsChanged() {
+		out.TagsChanged = didTagsChange(&stderr)
+	}
+
+	return out, nil
+}
+
+func didTagsChange(r io.Reader) bool {
+	scanner := git.NewFetchScanner(r)
+	for scanner.Scan() {
+		status := scanner.StatusLine()
+
+		// We can't detect if tags have been deleted, but we never call fetch
+		// with --prune-tags at the moment, so it should never happen.
+		if status.IsTagAdded() || status.IsTagUpdated() {
+			return true
+		}
+	}
+
+	// If the scanner fails for some reason, we don't know if tags changed, so
+	// assume they did for safety reasons.
+	return scanner.Err() != nil
 }
 
 func (s *server) validateFetchRemoteRequest(req *gitalypb.FetchRemoteRequest) error {
diff --git a/internal/gitaly/service/repository/fetch_remote_test.go b/internal/gitaly/service/repository/fetch_remote_test.go
index 586bd6e72..1006fd59c 100644
--- a/internal/gitaly/service/repository/fetch_remote_test.go
+++ b/internal/gitaly/service/repository/fetch_remote_test.go
@@ -24,7 +24,7 @@ import (
 	"google.golang.org/grpc/metadata"
 )
 
-func copyRepoWithNewRemote(t *testing.T, repo *gitalypb.Repository, locator storage.Locator, remote string) *gitalypb.Repository {
+func copyRepoWithNewRemote(t *testing.T, repo *gitalypb.Repository, locator storage.Locator, remote string) (*gitalypb.Repository, string) {
 	repoPath, err := locator.GetRepoPath(repo)
 	require.NoError(t, err)
 
@@ -37,7 +37,7 @@ func copyRepoWithNewRemote(t *testing.T, repo *gitalypb.Repository, locator stor
 
 	testhelper.MustRunCommand(t, nil, "git", "-C", clonePath, "remote", "add", remote, repoPath)
 
-	return cloneRepo
+	return cloneRepo, clonePath
 }
 
 func TestFetchRemoteSuccess(t *testing.T) {
@@ -51,23 +51,36 @@ func TestFetchRemoteSuccess(t *testing.T) {
 	testhelper.NewFeatureSets([]featureflag.FeatureFlag{
 		featureflag.GoFetchRemote,
 	}).Run(t, func(t *testing.T, ctx context.Context) {
-		testRepo, _, cleanupFn := testhelper.NewTestRepo(t)
+		testRepo, testRepoPath, cleanupFn := testhelper.NewTestRepo(t)
 		defer cleanupFn()
 
-		cloneRepo := copyRepoWithNewRemote(t, testRepo, locator, "my-remote")
+		cloneRepo, cloneRepoPath := copyRepoWithNewRemote(t, testRepo, locator, "my-remote")
 		defer func() {
-			path, err := locator.GetRepoPath(cloneRepo)
-			require.NoError(t, err)
-			require.NoError(t, os.RemoveAll(path))
+			require.NoError(t, os.RemoveAll(cloneRepoPath))
 		}()
 
-		resp, err := client.FetchRemote(ctx, &gitalypb.FetchRemoteRequest{
-			Repository: cloneRepo,
-			Remote:     "my-remote",
-			Timeout:    120,
-		})
-		assert.NoError(t, err)
-		assert.NotNil(t, resp)
+		// Ensure there's a new tag to fetch
+		testhelper.CreateTag(t, testRepoPath, "testtag", "master", nil)
+
+		// On the first run, TagsChanged will be true for both implementations
+		req := &gitalypb.FetchRemoteRequest{Repository: cloneRepo, Remote: "my-remote", Timeout: 120, CheckTagsChanged: true}
+		resp, err := client.FetchRemote(ctx, req)
+		require.NoError(t, err)
+		require.NotNil(t, resp)
+		require.Equal(t, resp.TagsChanged, true)
+
+		// On the second run, TagsChanged will be false for the Go implementation only
+		resp, err = client.FetchRemote(ctx, req)
+		require.NoError(t, err)
+		require.NotNil(t, resp)
+		require.Equal(t, resp.TagsChanged, !isFeatureEnabled(ctx, featureflag.GoFetchRemote))
+
+		// Finally, ensure that it returns true if we're asked not to check
+		req.CheckTagsChanged = false
+		resp, err = client.FetchRemote(ctx, req)
+		require.NoError(t, err)
+		require.NotNil(t, resp)
+		require.Equal(t, resp.TagsChanged, true)
 	})
 }
 
diff --git a/proto/go/gitalypb/repository-service.pb.go b/proto/go/gitalypb/repository-service.pb.go
index 95f052f63..b2834ab21 100644
--- a/proto/go/gitalypb/repository-service.pb.go
+++ b/proto/go/gitalypb/repository-service.pb.go
@@ -780,18 +780,22 @@ func (m *ApplyGitattributesResponse) XXX_DiscardUnknown() {
 var xxx_messageInfo_ApplyGitattributesResponse proto.InternalMessageInfo
 
 type FetchRemoteRequest struct {
-	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
-	Remote               string      `protobuf:"bytes,2,opt,name=remote,proto3" json:"remote,omitempty"`
-	Force                bool        `protobuf:"varint,3,opt,name=force,proto3" json:"force,omitempty"`
-	NoTags               bool        `protobuf:"varint,4,opt,name=no_tags,json=noTags,proto3" json:"no_tags,omitempty"`
-	Timeout              int32       `protobuf:"varint,5,opt,name=timeout,proto3" json:"timeout,omitempty"`
-	SshKey               string      `protobuf:"bytes,6,opt,name=ssh_key,json=sshKey,proto3" json:"ssh_key,omitempty"`
-	KnownHosts           string      `protobuf:"bytes,7,opt,name=known_hosts,json=knownHosts,proto3" json:"known_hosts,omitempty"`
-	NoPrune              bool        `protobuf:"varint,9,opt,name=no_prune,json=noPrune,proto3" json:"no_prune,omitempty"`
-	RemoteParams         *Remote     `protobuf:"bytes,10,opt,name=remote_params,json=remoteParams,proto3" json:"remote_params,omitempty"`
-	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
-	XXX_unrecognized     []byte      `json:"-"`
-	XXX_sizecache        int32       `json:"-"`
+	Repository   *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
+	Remote       string      `protobuf:"bytes,2,opt,name=remote,proto3" json:"remote,omitempty"`
+	Force        bool        `protobuf:"varint,3,opt,name=force,proto3" json:"force,omitempty"`
+	NoTags       bool        `protobuf:"varint,4,opt,name=no_tags,json=noTags,proto3" json:"no_tags,omitempty"`
+	Timeout      int32       `protobuf:"varint,5,opt,name=timeout,proto3" json:"timeout,omitempty"`
+	SshKey       string      `protobuf:"bytes,6,opt,name=ssh_key,json=sshKey,proto3" json:"ssh_key,omitempty"`
+	KnownHosts   string      `protobuf:"bytes,7,opt,name=known_hosts,json=knownHosts,proto3" json:"known_hosts,omitempty"`
+	NoPrune      bool        `protobuf:"varint,9,opt,name=no_prune,json=noPrune,proto3" json:"no_prune,omitempty"`
+	RemoteParams *Remote     `protobuf:"bytes,10,opt,name=remote_params,json=remoteParams,proto3" json:"remote_params,omitempty"`
+	// If check_tags_changed is true, the FetchRemote RPC will check whether any
+	// tags were modified, returning the result in the tags_changed field of
+	// FetchRemoteResponse
+	CheckTagsChanged     bool     `protobuf:"varint,11,opt,name=check_tags_changed,json=checkTagsChanged,proto3" json:"check_tags_changed,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *FetchRemoteRequest) Reset()         { *m = FetchRemoteRequest{} }
@@ -882,7 +886,18 @@ func (m *FetchRemoteRequest) GetRemoteParams() *Remote {
 	return nil
 }
 
+func (m *FetchRemoteRequest) GetCheckTagsChanged() bool {
+	if m != nil {
+		return m.CheckTagsChanged
+	}
+	return false
+}
+
 type FetchRemoteResponse struct {
+	// If check_tags_changed was set in the FetchRemoteRequest, the FetchRemote
+	// RPC will return false when no tags were changed, and true if tags were
+	// changed or answer cannot be determined.
+	TagsChanged          bool     `protobuf:"varint,1,opt,name=tags_changed,json=tagsChanged,proto3" json:"tags_changed,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -913,6 +928,13 @@ func (m *FetchRemoteResponse) XXX_DiscardUnknown() {
 
 var xxx_messageInfo_FetchRemoteResponse proto.InternalMessageInfo
 
+func (m *FetchRemoteResponse) GetTagsChanged() bool {
+	if m != nil {
+		return m.TagsChanged
+	}
+	return false
+}
+
 type CreateRepositoryRequest struct {
 	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}    `json:"-"`
@@ -4018,199 +4040,201 @@ func init() {
 func init() { proto.RegisterFile("repository-service.proto", fileDescriptor_e9b1768cf174c79b) }
 
 var fileDescriptor_e9b1768cf174c79b = []byte{
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+	0xcf, 0x4f, 0x08, 0x3d, 0x79, 0x2c, 0x45, 0x3c, 0x16, 0x3f, 0x8c, 0x3f, 0x3e, 0x21, 0xaa, 0x3d,
+	0x68, 0xb7, 0x8b, 0x82, 0xf4, 0xf4, 0x5f, 0x01, 0x00, 0x00, 0xff, 0xff, 0xec, 0x1f, 0xbe, 0xb4,
+	0x81, 0x2e, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/proto/repository-service.proto b/proto/repository-service.proto
index 1753363af..ed32e64f5 100644
--- a/proto/repository-service.proto
+++ b/proto/repository-service.proto
@@ -303,9 +303,18 @@ message FetchRemoteRequest {
   reserved 8;
   bool no_prune = 9;
   Remote remote_params = 10;
+  // If check_tags_changed is true, the FetchRemote RPC will check whether any
+  // tags were modified, returning the result in the tags_changed field of
+  // FetchRemoteResponse
+  bool check_tags_changed = 11;
 }
 
-message FetchRemoteResponse {}
+message FetchRemoteResponse {
+  // If check_tags_changed was set in the FetchRemoteRequest, the FetchRemote
+  // RPC will return false when no tags were changed, and true if tags were
+  // changed or answer cannot be determined.
+  bool tags_changed = 1;
+}
 
 message CreateRepositoryRequest {
   Repository repository = 1 [(target_repository)=true];
diff --git a/ruby/lib/gitaly_server/repository_service.rb b/ruby/lib/gitaly_server/repository_service.rb
index f2b718946..80f9098d1 100644
--- a/ruby/lib/gitaly_server/repository_service.rb
+++ b/ruby/lib/gitaly_server/repository_service.rb
@@ -43,7 +43,12 @@ module GitalyServer
 
       raise GRPC::Unknown.new("Fetching remote #{request.remote} failed: #{gitlab_projects.output}") unless success
 
-      Gitaly::FetchRemoteResponse.new
+      # This implementation is being replaced with a Go implementation, which
+      # correctly implements the tags_changed parameter. Pretending the tags
+      # have always changed here retains the semantics of this implementation,
+      # which will be removed once the rollout is complete:
+      # https://gitlab.com/gitlab-org/gitaly/-/issues/3307
+      Gitaly::FetchRemoteResponse.new(tags_changed: true)
     ensure
       repository&.remove_remote(remote_name)
     end
diff --git a/ruby/proto/gitaly/repository-service_pb.rb b/ruby/proto/gitaly/repository-service_pb.rb
index c73dd9516..4eeed111d 100644
--- a/ruby/proto/gitaly/repository-service_pb.rb
+++ b/ruby/proto/gitaly/repository-service_pb.rb
@@ -68,8 +68,10 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
       optional :known_hosts, :string, 7
       optional :no_prune, :bool, 9
       optional :remote_params, :message, 10, "gitaly.Remote"
+      optional :check_tags_changed, :bool, 11
     end
     add_message "gitaly.FetchRemoteResponse" do
+      optional :tags_changed, :bool, 1
     end
     add_message "gitaly.CreateRepositoryRequest" do
       optional :repository, :message, 1, "gitaly.Repository"