Prune objects older then 24h on garbage collection

By default the dangling objects remain in the object storage
for 2 weeks. This could be an issue if there are large files
or sensitive data being removed, but not fully deleted from
storage. The new configuration parameter `prune` for
`GarbageCollect` RPC results to execution of `gc` with additional
configuration option for `prune` command executed as part of
the garbage collection process. It removes all dangling objects
from the storage that are older then 24h.

Closes: https://gitlab.com/gitlab-org/gitaly/-/issues/2919

7 files changed, 277 insertions, 197 deletions

diff --git a/changelogs/unreleased/ps-gc-prune-expire.yml b/changelogs/unreleased/ps-gc-prune-expire.yml
new file mode 100644
index 000000000..ce47e600e
--- /dev/null
+++ b/changelogs/unreleased/ps-gc-prune-expire.yml
@@ -0,0 +1,5 @@
+---
+title: Prune objects older than 24h on garbage collection
+merge_request: 2469
+author:
+type: added
diff --git a/internal/service/repository/gc.go b/internal/service/repository/gc.go
index 8dfa3890f..b333b8766 100644
--- a/internal/service/repository/gc.go
+++ b/internal/service/repository/gc.go
@@ -65,9 +65,15 @@ func (s *server) GarbageCollect(ctx context.Context, in *gitalypb.GarbageCollect
 func gc(ctx context.Context, in *gitalypb.GarbageCollectRequest) error {
 	args := repackConfig(ctx, in.CreateBitmap)
 
+	var flags []git.Option
+	if in.Prune {
+		flags = append(flags, git.Flag{Name: "--prune=24.hours.ago"})
+	}
+
 	cmd, err := git.SafeCmd(ctx, in.GetRepository(), args,
-		git.SubCmd{Name: "gc"},
+		git.SubCmd{Name: "gc", Flags: flags},
 	)
+
 	if err != nil {
 		if git.IsInvalidArgErr(err) {
 			return helper.ErrInvalidArgumentf("GarbageCollect: gitCommand: %v", err)
diff --git a/internal/service/repository/gc_test.go b/internal/service/repository/gc_test.go
index a0ba9c251..8786522f3 100644
--- a/internal/service/repository/gc_test.go
+++ b/internal/service/repository/gc_test.go
@@ -122,6 +122,51 @@ func TestGarbageCollectSuccess(t *testing.T) {
 	}
 }
 
+func TestGarbageCollectWithPrune(t *testing.T) {
+	ctx, cancel := testhelper.Context()
+	defer cancel()
+
+	serverSocketPath, stop := runRepoServer(t)
+	defer stop()
+
+	client, conn := newRepositoryClient(t, serverSocketPath)
+	defer conn.Close()
+
+	testRepo, repoPath, cleanupFn := testhelper.NewTestRepo(t)
+	defer cleanupFn()
+
+	blobHashes := testhelper.WriteBlobs(t, repoPath, 3)
+	oldDanglingObjFile := filepath.Join(repoPath, "objects", blobHashes[0][:2], blobHashes[0][2:])
+	newDanglingObjFile := filepath.Join(repoPath, "objects", blobHashes[1][:2], blobHashes[1][2:])
+	oldReferencedObjFile := filepath.Join(repoPath, "objects", blobHashes[2][:2], blobHashes[2][2:])
+
+	// create a reference to the blob, so it should not be removed by gc
+	testhelper.CommitBlobWithName(t, repoPath, blobHashes[2], t.Name(), t.Name())
+
+	// change modification time of the blobs to make them attractive for the gc
+	aBitMoreThan24HoursAgo := time.Now().Add(-24*time.Hour - time.Second)
+	farAgo := time.Date(2015, 1, 1, 1, 1, 1, 1, time.UTC)
+	require.NoError(t, os.Chtimes(oldDanglingObjFile, aBitMoreThan24HoursAgo, aBitMoreThan24HoursAgo))
+	require.NoError(t, os.Chtimes(newDanglingObjFile, time.Now(), time.Now()))
+	require.NoError(t, os.Chtimes(oldReferencedObjFile, farAgo, farAgo))
+
+	// Prune option has no effect when disabled
+	c, err := client.GarbageCollect(ctx, &gitalypb.GarbageCollectRequest{Repository: testRepo, Prune: false})
+	require.NoError(t, err)
+	require.NotNil(t, c)
+	require.FileExists(t, oldDanglingObjFile, "blob should not be removed from object storage as it was modified less then 2 weeks ago")
+
+	// Prune option has effect when enabled
+	c, err = client.GarbageCollect(ctx, &gitalypb.GarbageCollectRequest{Repository: testRepo, Prune: true})
+	require.NoError(t, err)
+	require.NotNil(t, c)
+
+	_, err = os.Stat(oldDanglingObjFile)
+	require.True(t, os.IsNotExist(err), "blob should be removed from object storage as it is too old and there are no references to it")
+	require.FileExists(t, newDanglingObjFile, "blob should not be removed from object storage as it is fresh enough despite there are no references to it")
+	require.FileExists(t, oldReferencedObjFile, "blob should not be removed from object storage as it is referenced by something despite it is too old")
+}
+
 func TestGarbageCollectLogStatistics(t *testing.T) {
 	defer func(tl func(tb testing.TB) *logrus.Logger) {
 		testhelper.NewTestLogger = tl
diff --git a/internal/testhelper/testhelper.go b/internal/testhelper/testhelper.go
index ee1562b01..16084860d 100644
--- a/internal/testhelper/testhelper.go
+++ b/internal/testhelper/testhelper.go
@@ -212,6 +212,10 @@ func RequireGrpcError(t testing.TB, err error, expectedCode codes.Code) {
 
 // MustRunCommand runs a command with an optional standard input and returns the standard output, or fails.
 func MustRunCommand(t testing.TB, stdin io.Reader, name string, args ...string) []byte {
+	if t != nil {
+		t.Helper()
+	}
+
 	cmd := exec.Command(name, args...)
 
 	if name == "git" {
diff --git a/proto/go/gitalypb/repository-service.pb.go b/proto/go/gitalypb/repository-service.pb.go
index e868f994a..bc67597b9 100644
--- a/proto/go/gitalypb/repository-service.pb.go
+++ b/proto/go/gitalypb/repository-service.pb.go
@@ -322,11 +322,17 @@ func (m *RepackFullResponse) XXX_DiscardUnknown() {
 var xxx_messageInfo_RepackFullResponse proto.InternalMessageInfo
 
 type GarbageCollectRequest struct {
-	Repository           *Repository `protobuf:"bytes,1,opt,name=repository,proto3" json:"repository,omitempty"`
-	CreateBitmap         bool        `protobuf:"varint,2,opt,name=create_bitmap,json=createBitmap,proto3" json:"create_bitmap,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"`
+	CreateBitmap bool        `protobuf:"varint,2,opt,name=create_bitmap,json=createBitmap,proto3" json:"create_bitmap,omitempty"`
+	// If set to 'true' the 'gc' will be triggered with '--prune=24.hours.ago' flag.
+	// This will remove dangling objects from the object storage that were not modified in the last 24 hours.
+	// If 'false' provided the 'gc' will rely on the default expiration period (2 weeks).
+	// The window of 24 hours exists because of possible concurrent operations running on the same
+	// storage and removal of the objects may cause races and fail concurrent operations.
+	Prune                bool     `protobuf:"varint,3,opt,name=prune,proto3" json:"prune,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
 func (m *GarbageCollectRequest) Reset()         { *m = GarbageCollectRequest{} }
@@ -368,6 +374,13 @@ func (m *GarbageCollectRequest) GetCreateBitmap() bool {
 	return false
 }
 
+func (m *GarbageCollectRequest) GetPrune() bool {
+	if m != nil {
+		return m.Prune
+	}
+	return false
+}
+
 type GarbageCollectResponse struct {
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
@@ -4004,198 +4017,198 @@ func init() {
 func init() { proto.RegisterFile("repository-service.proto", fileDescriptor_e9b1768cf174c79b) }
 
 var fileDescriptor_e9b1768cf174c79b = []byte{
-	// 3044 bytes of a gzipped FileDescriptorProto
+	// 3054 bytes of a gzipped FileDescriptorProto
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+	0x66, 0xc9, 0x3a, 0x02, 0x0b, 0x13, 0x73, 0x1d, 0x81, 0xc5, 0x49, 0x76, 0x28, 0x64, 0xe3, 0xf1,
+	0x6b, 0x3e, 0xd8, 0xb3, 0xdb, 0x6b, 0x0e, 0xe9, 0x3f, 0x92, 0x9f, 0x9f, 0x12, 0x7a, 0xfa, 0x48,
+	0xb2, 0x78, 0x24, 0xfe, 0x07, 0x7f, 0x74, 0x4a, 0x54, 0x7b, 0xd0, 0x6e, 0x97, 0x05, 0xe9, 0xe9,
+	0x3f, 0x02, 0x00, 0x00, 0xff, 0xff, 0x34, 0x36, 0x38, 0x22, 0x60, 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 a4759fe49..9c16d9b1b 100644
--- a/proto/repository-service.proto
+++ b/proto/repository-service.proto
@@ -245,6 +245,12 @@ message RepackFullResponse {}
 message GarbageCollectRequest {
   Repository repository = 1 [(target_repository)=true];
   bool create_bitmap = 2;
+  // If set to 'true' the 'gc' will be triggered with '--prune=24.hours.ago' flag.
+  // This will remove dangling objects from the object storage that were not modified in the last 24 hours.
+  // If 'false' provided the 'gc' will rely on the default expiration period (2 weeks).
+  // The window of 24 hours exists because of possible concurrent operations running on the same
+  // storage and removal of the objects may cause races and fail concurrent operations.
+  bool prune = 3;
 }
 
 message GarbageCollectResponse {}
diff --git a/ruby/proto/gitaly/repository-service_pb.rb b/ruby/proto/gitaly/repository-service_pb.rb
index 375c275e4..a50b34355 100644
--- a/ruby/proto/gitaly/repository-service_pb.rb
+++ b/ruby/proto/gitaly/repository-service_pb.rb
@@ -27,6 +27,7 @@ Google::Protobuf::DescriptorPool.generated_pool.build do
     add_message "gitaly.GarbageCollectRequest" do
       optional :repository, :message, 1, "gitaly.Repository"
       optional :create_bitmap, :bool, 2
+      optional :prune, :bool, 3
     end
     add_message "gitaly.GarbageCollectResponse" do
     end