Refactor LFS GC functions

- Remove options that currently aren't set
on `GarbageCollectLFSMetaObjectsOptions` and
`IterateLFSMetaObjectsForRepoOptions`.
- Simplify `IterateRepositoryIDsWithLFSMetaObjects` and
`IterateLFSMetaObjectsForRepo`.
- `IterateLFSMetaObjectsForRepo` was previously able to get in a
loop (`gc-lfs` doctor check was able to reproduce this) because the code
expected that the records would be updated to not match the SQL query,
but that wasn't the case. Simply enforce that only records higher than
the latest `id` from the previous iteration are allowed.
- For `gc-lfs` doctor check this was because `UpdatedLessRecentlyThan`
option was not set, which caused that records just marked as active in
the iteration weren't being filtered.
- Add unit tests
- Most likely a regression from 2cc3a6381c.
- The bug with `gc-lfs` was found on Codeberg.

(cherry picked from commit 7ffa7f5bce)

models/git/TestIterateRepositoryIDsWithLFSMetaObjects/lfs_meta_object.yaml

@@ -0,0 +1,7 @@
+-
+
+  id: 1000
+  oid: 9d172e5c64b4f0024b9901ec6afe9ea052f3c9b6ff9f4b07956d8c48c86fca82
+  size: 25
+  repository_id: 1
+  created_unix: 1712309123

models/git/lfs.go

@@ -337,58 +337,47 @@ func GetRepoLFSSize(ctx context.Context, repoID int64) (int64, error) {
 func IterateRepositoryIDsWithLFSMetaObjects(ctx context.Context, f func(ctx context.Context, repoID, count int64) error) error {
 	batchSize := setting.Database.IterateBufferSize
 	sess := db.GetEngine(ctx)
-	id := int64(0)
+	var start int
 	type RepositoryCount struct {
 		RepositoryID int64
 		Count        int64
 	}
 	for {
 		counts := make([]*RepositoryCount, 0, batchSize)
-		sess.Select("repository_id, COUNT(id) AS count").
+		if err := sess.Select("repository_id, COUNT(id) AS count").
 			Table("lfs_meta_object").
-			Where("repository_id > ?", id).
 			GroupBy("repository_id").
-			OrderBy("repository_id ASC")
-
-		if err := sess.Limit(batchSize, 0).Find(&counts); err != nil {
+			OrderBy("repository_id ASC").Limit(batchSize, start).Find(&counts); err != nil {
 			return err
 		}
 		if len(counts) == 0 {
 			return nil
 		}
+		start += len(counts)
 
 		for _, count := range counts {
 			if err := f(ctx, count.RepositoryID, count.Count); err != nil {
 				return err
 			}
 		}
-		id = counts[len(counts)-1].RepositoryID
 	}
 }
 
 // IterateLFSMetaObjectsForRepoOptions provides options for IterateLFSMetaObjectsForRepo
 type IterateLFSMetaObjectsForRepoOptions struct {
-	OlderThan                 timeutil.TimeStamp
-	UpdatedLessRecentlyThan   timeutil.TimeStamp
-	OrderByUpdated            bool
-	LoopFunctionAlwaysUpdates bool
+	OlderThan               timeutil.TimeStamp
+	UpdatedLessRecentlyThan timeutil.TimeStamp
 }
 
 // IterateLFSMetaObjectsForRepo provides a iterator for LFSMetaObjects per Repo
-func IterateLFSMetaObjectsForRepo(ctx context.Context, repoID int64, f func(context.Context, *LFSMetaObject, int64) error, opts *IterateLFSMetaObjectsForRepoOptions) error {
-	var start int
+func IterateLFSMetaObjectsForRepo(ctx context.Context, repoID int64, f func(context.Context, *LFSMetaObject) error, opts *IterateLFSMetaObjectsForRepoOptions) error {
 	batchSize := setting.Database.IterateBufferSize
 	engine := db.GetEngine(ctx)
-	type CountLFSMetaObject struct {
-		Count         int64
-		LFSMetaObject `xorm:"extends"`
-	}
-
 	id := int64(0)
 
 	for {
-		beans := make([]*CountLFSMetaObject, 0, batchSize)
-		sess := engine.Table("lfs_meta_object").Select("`lfs_meta_object`.*, COUNT(`l1`.oid) AS `count`").
+		beans := make([]*LFSMetaObject, 0, batchSize)
+		sess := engine.Table("lfs_meta_object").Select("`lfs_meta_object`.*").
 			Join("INNER", "`lfs_meta_object` AS l1", "`lfs_meta_object`.oid = `l1`.oid").
 			Where("`lfs_meta_object`.repository_id = ?", repoID)
 		if !opts.OlderThan.IsZero() {
@@ -397,25 +386,19 @@ func IterateLFSMetaObjectsForRepo(ctx context.Context, repoID int64, f func(cont
 		if !opts.UpdatedLessRecentlyThan.IsZero() {
 			sess.And("`lfs_meta_object`.updated_unix < ?", opts.UpdatedLessRecentlyThan)
 		}
-		sess.GroupBy("`lfs_meta_object`.id")
-		if opts.OrderByUpdated {
-			sess.OrderBy("`lfs_meta_object`.updated_unix ASC")
-		} else {
-			sess.And("`lfs_meta_object`.id > ?", id)
-			sess.OrderBy("`lfs_meta_object`.id ASC")
-		}
-		if err := sess.Limit(batchSize, start).Find(&beans); err != nil {
+		sess.GroupBy("`lfs_meta_object`.id").
+			And("`lfs_meta_object`.id > ?", id).
+			OrderBy("`lfs_meta_object`.id ASC")
+
+		if err := sess.Limit(batchSize, 0).Find(&beans); err != nil {
 			return err
 		}
 		if len(beans) == 0 {
 			return nil
 		}
-		if !opts.LoopFunctionAlwaysUpdates {
-			start += len(beans)
-		}
 
 		for _, bean := range beans {
-			if err := f(ctx, &bean.LFSMetaObject, bean.Count); err != nil {
+			if err := f(ctx, bean); err != nil {
 				return err
 			}
 		}

models/git/lfs_test.go

@@ -0,0 +1,101 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIterateRepositoryIDsWithLFSMetaObjects(t *testing.T) {
+	defer unittest.OverrideFixtures(
+		unittest.FixturesOptions{
+			Dir:  filepath.Join(setting.AppWorkPath, "models/fixtures/"),
+			Base: setting.AppWorkPath,
+			Dirs: []string{"models/git/TestIterateRepositoryIDsWithLFSMetaObjects/"},
+		},
+	)()
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	type repocount struct {
+		repoid int64
+		count  int64
+	}
+	expected := []repocount{{1, 1}, {54, 4}}
+
+	t.Run("Normal batch size", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Database.IterateBufferSize, 20)()
+		cases := []repocount{}
+
+		err := IterateRepositoryIDsWithLFSMetaObjects(db.DefaultContext, func(ctx context.Context, repoID, count int64) error {
+			cases = append(cases, repocount{repoID, count})
+			return nil
+		})
+		assert.NoError(t, err)
+		assert.EqualValues(t, expected, cases)
+	})
+
+	t.Run("Low batch size", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Database.IterateBufferSize, 1)()
+		cases := []repocount{}
+
+		err := IterateRepositoryIDsWithLFSMetaObjects(db.DefaultContext, func(ctx context.Context, repoID, count int64) error {
+			cases = append(cases, repocount{repoID, count})
+			return nil
+		})
+		assert.NoError(t, err)
+		assert.EqualValues(t, expected, cases)
+	})
+}
+
+func TestIterateLFSMetaObjectsForRepo(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	expectedIDs := []int64{1, 2, 3, 4}
+
+	t.Run("Normal batch size", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Database.IterateBufferSize, 20)()
+		actualIDs := []int64{}
+
+		err := IterateLFSMetaObjectsForRepo(db.DefaultContext, 54, func(ctx context.Context, lo *LFSMetaObject) error {
+			actualIDs = append(actualIDs, lo.ID)
+			return nil
+		}, &IterateLFSMetaObjectsForRepoOptions{})
+		assert.NoError(t, err)
+		assert.EqualValues(t, expectedIDs, actualIDs)
+	})
+
+	t.Run("Low batch size", func(t *testing.T) {
+		defer test.MockVariableValue(&setting.Database.IterateBufferSize, 1)()
+		actualIDs := []int64{}
+
+		err := IterateLFSMetaObjectsForRepo(db.DefaultContext, 54, func(ctx context.Context, lo *LFSMetaObject) error {
+			actualIDs = append(actualIDs, lo.ID)
+			return nil
+		}, &IterateLFSMetaObjectsForRepoOptions{})
+		assert.NoError(t, err)
+		assert.EqualValues(t, expectedIDs, actualIDs)
+
+		t.Run("Batch handles updates", func(t *testing.T) {
+			actualIDs := []int64{}
+
+			err := IterateLFSMetaObjectsForRepo(db.DefaultContext, 54, func(ctx context.Context, lo *LFSMetaObject) error {
+				actualIDs = append(actualIDs, lo.ID)
+				_, err := db.DeleteByID[LFSMetaObject](ctx, lo.ID)
+				assert.NoError(t, err)
+				return nil
+			}, &IterateLFSMetaObjectsForRepoOptions{})
+			assert.NoError(t, err)
+			assert.EqualValues(t, expectedIDs, actualIDs)
+		})
+	})
+}

services/doctor/lfs.go

@@ -44,6 +44,7 @@ func garbageCollectLFSCheck(ctx context.Context, logger log.Logger, autofix bool
 		OlderThan: time.Now().Add(-24 * time.Hour * 7),
 		// We don't set the UpdatedLessRecentlyThan because we want to do a full GC
 	}); err != nil {
+		logger.Error("Couldn't garabage collect LFS objects: %v", err)
 		return err
 	}
 

services/repository/lfs.go

@@ -5,7 +5,6 @@ package repository
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"time"
 
@@ -21,12 +20,10 @@ import (
 
 // GarbageCollectLFSMetaObjectsOptions provides options for GarbageCollectLFSMetaObjects function
 type GarbageCollectLFSMetaObjectsOptions struct {
-	LogDetail                func(format string, v ...any)
-	AutoFix                  bool
-	OlderThan                time.Time
-	UpdatedLessRecentlyThan  time.Time
-	NumberToCheckPerRepo     int64
-	ProportionToCheckPerRepo float64
+	LogDetail               func(format string, v ...any)
+	AutoFix                 bool
+	OlderThan               time.Time
+	UpdatedLessRecentlyThan time.Time
 }
 
 // GarbageCollectLFSMetaObjects garbage collects LFS objects for all repositories
@@ -49,9 +46,6 @@ func GarbageCollectLFSMetaObjects(ctx context.Context, opts GarbageCollectLFSMet
 			return err
 		}
 
-		if newMinimum := int64(float64(count) * opts.ProportionToCheckPerRepo); newMinimum > opts.NumberToCheckPerRepo && opts.NumberToCheckPerRepo != 0 {
-			opts.NumberToCheckPerRepo = newMinimum
-		}
 		return GarbageCollectLFSMetaObjectsForRepo(ctx, repo, opts)
 	})
 }
@@ -78,13 +72,9 @@ func GarbageCollectLFSMetaObjectsForRepo(ctx context.Context, repo *repo_model.R
 	defer gitRepo.Close()
 
 	store := lfs.NewContentStore()
-	errStop := errors.New("STOPERR")
 	objectFormat := git.ObjectFormatFromName(repo.ObjectFormatName)
 
-	err = git_model.IterateLFSMetaObjectsForRepo(ctx, repo.ID, func(ctx context.Context, metaObject *git_model.LFSMetaObject, count int64) error {
-		if opts.NumberToCheckPerRepo > 0 && total > opts.NumberToCheckPerRepo {
-			return errStop
-		}
+	err = git_model.IterateLFSMetaObjectsForRepo(ctx, repo.ID, func(ctx context.Context, metaObject *git_model.LFSMetaObject) error {
 		total++
 		pointerSha := git.ComputeBlobHash(objectFormat, []byte(metaObject.Pointer.StringContent()))
 
@@ -123,16 +113,10 @@ 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:                 timeutil.TimeStamp(opts.OlderThan.Unix()),
-		UpdatedLessRecentlyThan:   timeutil.TimeStamp(opts.UpdatedLessRecentlyThan.Unix()),
-		OrderByUpdated:            true,
-		LoopFunctionAlwaysUpdates: true,
+		OlderThan:               timeutil.TimeStamp(opts.OlderThan.Unix()),
+		UpdatedLessRecentlyThan: timeutil.TimeStamp(opts.UpdatedLessRecentlyThan.Unix()),
 	})
-
-	if err == errStop {
-		opts.LogDetail("Processing stopped at %d total LFSMetaObjects in %-v", total, repo)
-		return nil
-	} else if err != nil {
+	if err != nil {
 		return err
 	}
 	return nil