Fix bugs in LFS meta garbage collection (#26122) (#26157)

Backport #26122 by @Zettat123

This PR

- Fix #26093. Replace `time.Time` with `timeutil.TimeStamp`
- Fix #26135. Add missing `xorm:"extends"` to `CountLFSMetaObject` for
LFS meta object query
- Add a unit test for LFS meta object garbage collection

Co-authored-by: Zettat123 <zettat123@gmail.com>
(cherry picked from commit a12d036a6856846f8ab52dd8acf3ed21f5a77036)

models/git/lfs.go

@@ -6,7 +6,6 @@ package git
 import (
 	"context"
 	"fmt"
-	"time"
 
 	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/models/perm"
@@ -370,8 +369,8 @@ func IterateRepositoryIDsWithLFSMetaObjects(ctx context.Context, f func(ctx cont
 
 // IterateLFSMetaObjectsForRepoOptions provides options for IterateLFSMetaObjectsForRepo
 type IterateLFSMetaObjectsForRepoOptions struct {
-	OlderThan                 time.Time
-	UpdatedLessRecentlyThan   time.Time
+	OlderThan                 timeutil.TimeStamp
+	UpdatedLessRecentlyThan   timeutil.TimeStamp
 	OrderByUpdated            bool
 	LoopFunctionAlwaysUpdates bool
 }
@@ -382,8 +381,8 @@ func IterateLFSMetaObjectsForRepo(ctx context.Context, repoID int64, f func(cont
 	batchSize := setting.Database.IterateBufferSize
 	engine := db.GetEngine(ctx)
 	type CountLFSMetaObject struct {
-		Count int64
-		LFSMetaObject
+		Count         int64
+		LFSMetaObject `xorm:"extends"`
 	}
 
 	id := int64(0)

services/repository/lfs.go

@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/modules/lfs"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/timeutil"
 )
 
 // GarbageCollectLFSMetaObjectsOptions provides options for GarbageCollectLFSMetaObjects function
@@ -122,8 +123,8 @@ func GarbageCollectLFSMetaObjectsForRepo(ctx context.Context, repo *repo_model.R
 		//
 		// It is likely that a week is potentially excessive but it should definitely be enough that any
 		// unassociated LFS object is genuinely unassociated.
-		OlderThan:                 opts.OlderThan,
-		UpdatedLessRecentlyThan:   opts.UpdatedLessRecentlyThan,
+		OlderThan:                 timeutil.TimeStamp(opts.OlderThan.Unix()),
+		UpdatedLessRecentlyThan:   timeutil.TimeStamp(opts.UpdatedLessRecentlyThan.Unix()),
 		OrderByUpdated:            true,
 		LoopFunctionAlwaysUpdates: true,
 	})

services/repository/lfs_test.go

@@ -0,0 +1,64 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repository
+
+import (
+	"bytes"
+	"context"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models/db"
+	git_model "code.gitea.io/gitea/models/git"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/lfs"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/storage"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGarbageCollectLFSMetaObjects(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	setting.LFS.StartServer = true
+	err := storage.Init()
+	assert.NoError(t, err)
+
+	repo, err := repo_model.GetRepositoryByOwnerAndName(db.DefaultContext, "user2", "repo1")
+	assert.NoError(t, err)
+
+	// add lfs object
+	lfsContent := []byte("gitea1")
+	lfsOid := storeObjectInRepo(t, repo.ID, &lfsContent)
+
+	// gc
+	err = GarbageCollectLFSMetaObjects(context.Background(), GarbageCollectLFSMetaObjectsOptions{
+		AutoFix:                 true,
+		OlderThan:               time.Now().Add(7 * 24 * time.Hour).Add(5 * 24 * time.Hour),
+		UpdatedLessRecentlyThan: time.Now().Add(7 * 24 * time.Hour).Add(3 * 24 * time.Hour),
+	})
+	assert.NoError(t, err)
+
+	// lfs meta has been deleted
+	_, err = git_model.GetLFSMetaObjectByOid(db.DefaultContext, repo.ID, lfsOid)
+	assert.ErrorIs(t, err, git_model.ErrLFSObjectNotExist)
+}
+
+func storeObjectInRepo(t *testing.T, repositoryID int64, content *[]byte) string {
+	pointer, err := lfs.GeneratePointer(bytes.NewReader(*content))
+	assert.NoError(t, err)
+
+	_, err = git_model.NewLFSMetaObject(db.DefaultContext, &git_model.LFSMetaObject{Pointer: pointer, RepositoryID: repositoryID})
+	assert.NoError(t, err)
+	contentStore := lfs.NewContentStore()
+	exist, err := contentStore.Exists(pointer)
+	assert.NoError(t, err)
+	if !exist {
+		err := contentStore.Put(pointer, bytes.NewReader(*content))
+		assert.NoError(t, err)
+	}
+	return pointer.Oid
+}