Reduce integration test overhead (#32475)

In profiling integration tests, I found a couple places where per-test
overhead could be reduced:

* Avoiding disk IO by synchronizing instead of deleting & copying test
Git repository data. This saves ~100ms per test on my machine
* When flushing queues in `PrintCurrentTest`, invoke `FlushWithContext`
in a parallel.

---------

Co-authored-by: wxiaoguang <[email protected]>

Author: bohde

models/fixtures/repository.yml

@@ -26,7 +26,7 @@
   fork_id: 0
   is_template: false
   template_id: 0
-  size: 8478
+  size: 0
   is_fsck_enabled: true
   close_issues_via_commit_in_any_branch: false
 

models/migrations/base/tests.go

@@ -8,7 +8,6 @@ import (
 	"context"
 	"fmt"
 	"os"
-	"path"
 	"path/filepath"
 	"runtime"
 	"testing"
@@ -35,27 +34,7 @@ func PrepareTestEnv(t *testing.T, skip int, syncModels ...any) (*xorm.Engine, fu
 	ourSkip := 2
 	ourSkip += skip
 	deferFn := testlogger.PrintCurrentTest(t, ourSkip)
-	assert.NoError(t, os.RemoveAll(setting.RepoRootPath))
-	assert.NoError(t, unittest.CopyDir(path.Join(filepath.Dir(setting.AppPath), "tests/gitea-repositories-meta"), setting.RepoRootPath))
-	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
-	if err != nil {
-		assert.NoError(t, err, "unable to read the new repo root: %v\n", err)
-	}
-	for _, ownerDir := range ownerDirs {
-		if !ownerDir.Type().IsDir() {
-			continue
-		}
-		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
-		if err != nil {
-			assert.NoError(t, err, "unable to read the new repo root: %v\n", err)
-		}
-		for _, repoDir := range repoDirs {
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0o755)
-		}
-	}
+	assert.NoError(t, unittest.SyncDirs(filepath.Join(filepath.Dir(setting.AppPath), "tests/gitea-repositories-meta"), setting.RepoRootPath))
 
 	if err := deleteDB(); err != nil {
 		t.Errorf("unable to reset database: %v", err)
@@ -123,20 +102,20 @@ func MainTest(m *testing.M) {
 	if runtime.GOOS == "windows" {
 		giteaBinary += ".exe"
 	}
-	setting.AppPath = path.Join(giteaRoot, giteaBinary)
+	setting.AppPath = filepath.Join(giteaRoot, giteaBinary)
 	if _, err := os.Stat(setting.AppPath); err != nil {
 		fmt.Printf("Could not find gitea binary at %s\n", setting.AppPath)
 		os.Exit(1)
 	}
 
 	giteaConf := os.Getenv("GITEA_CONF")
 	if giteaConf == "" {
-		giteaConf = path.Join(filepath.Dir(setting.AppPath), "tests/sqlite.ini")
+		giteaConf = filepath.Join(filepath.Dir(setting.AppPath), "tests/sqlite.ini")
 		fmt.Printf("Environment variable $GITEA_CONF not set - defaulting to %s\n", giteaConf)
 	}
 
-	if !path.IsAbs(giteaConf) {
-		setting.CustomConf = path.Join(giteaRoot, giteaConf)
+	if !filepath.IsAbs(giteaConf) {
+		setting.CustomConf = filepath.Join(giteaRoot, giteaConf)
 	} else {
 		setting.CustomConf = giteaConf
 	}

models/unittest/fscopy.go

@@ -4,10 +4,8 @@
 package unittest
 
 import (
-	"errors"
-	"io"
 	"os"
-	"path"
+	"path/filepath"
 	"strings"
 
 	"code.gitea.io/gitea/modules/util"
@@ -32,67 +30,73 @@ func Copy(src, dest string) error {
 		return os.Symlink(target, dest)
 	}
 
-	sr, err := os.Open(src)
+	return util.CopyFile(src, dest)
+}
+
+// Sync synchronizes the two files. This is skipped if both files
+// exist and the size, modtime, and mode match.
+func Sync(srcPath, destPath string) error {
+	dest, err := os.Stat(destPath)
 	if err != nil {
+		if os.IsNotExist(err) {
+			return Copy(srcPath, destPath)
+		}
 		return err
 	}
-	defer sr.Close()
 
-	dw, err := os.Create(dest)
+	src, err := os.Stat(srcPath)
 	if err != nil {
 		return err
 	}
-	defer dw.Close()
 
-	if _, err = io.Copy(dw, sr); err != nil {
-		return err
+	if src.Size() == dest.Size() &&
+		src.ModTime() == dest.ModTime() &&
+		src.Mode() == dest.Mode() {
+		return nil
 	}
 
-	// Set back file information.
-	if err = os.Chtimes(dest, si.ModTime(), si.ModTime()); err != nil {
-		return err
-	}
-	return os.Chmod(dest, si.Mode())
+	return Copy(srcPath, destPath)
 }
 
-// CopyDir copy files recursively from source to target directory.
-//
-// The filter accepts a function that process the path info.
-// and should return true for need to filter.
-//
+// SyncDirs synchronizes files recursively from source to target directory.
 // It returns error when error occurs in underlying functions.
-func CopyDir(srcPath, destPath string, filters ...func(filePath string) bool) error {
-	// Check if target directory exists.
-	if _, err := os.Stat(destPath); !errors.Is(err, os.ErrNotExist) {
-		return util.NewAlreadyExistErrorf("file or directory already exists: %s", destPath)
-	}
-
+func SyncDirs(srcPath, destPath string) error {
 	err := os.MkdirAll(destPath, os.ModePerm)
 	if err != nil {
 		return err
 	}
 
-	// Gather directory info.
-	infos, err := util.StatDir(srcPath, true)
+	// find and delete all untracked files
+	destFiles, err := util.StatDir(destPath, true)
 	if err != nil {
 		return err
 	}
-
-	var filter func(filePath string) bool
-	if len(filters) > 0 {
-		filter = filters[0]
-	}
-
-	for _, info := range infos {
-		if filter != nil && filter(info) {
-			continue
+	for _, destFile := range destFiles {
+		destFilePath := filepath.Join(destPath, destFile)
+		if _, err = os.Stat(filepath.Join(srcPath, destFile)); err != nil {
+			if os.IsNotExist(err) {
+				// if src file does not exist, remove dest file
+				if err = os.RemoveAll(destFilePath); err != nil {
+					return err
+				}
+			} else {
+				return err
+			}
 		}
+	}
 
-		curPath := path.Join(destPath, info)
-		if strings.HasSuffix(info, "/") {
-			err = os.MkdirAll(curPath, os.ModePerm)
+	// sync src files to dest
+	srcFiles, err := util.StatDir(srcPath, true)
+	if err != nil {
+		return err
+	}
+	for _, srcFile := range srcFiles {
+		destFilePath := filepath.Join(destPath, srcFile)
+		// util.StatDir appends a slash to the directory name
+		if strings.HasSuffix(srcFile, "/") {
+			err = os.MkdirAll(destFilePath, os.ModePerm)
 		} else {
-			err = Copy(path.Join(srcPath, info), curPath)
+			err = Sync(filepath.Join(srcPath, srcFile), destFilePath)
 		}
 		if err != nil {
 			return err

models/unittest/testdb.go

@@ -164,35 +164,13 @@ func MainTest(m *testing.M, testOpts ...*TestOptions) {
 	if err = storage.Init(); err != nil {
 		fatalTestError("storage.Init: %v\n", err)
 	}
-	if err = util.RemoveAll(repoRootPath); err != nil {
-		fatalTestError("util.RemoveAll: %v\n", err)
-	}
-	if err = CopyDir(filepath.Join(giteaRoot, "tests", "gitea-repositories-meta"), setting.RepoRootPath); err != nil {
-		fatalTestError("util.CopyDir: %v\n", err)
+	if err = SyncDirs(filepath.Join(giteaRoot, "tests", "gitea-repositories-meta"), setting.RepoRootPath); err != nil {
+		fatalTestError("util.SyncDirs: %v\n", err)
 	}
 
 	if err = git.InitFull(context.Background()); err != nil {
 		fatalTestError("git.Init: %v\n", err)
 	}
-	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
-	if err != nil {
-		fatalTestError("unable to read the new repo root: %v\n", err)
-	}
-	for _, ownerDir := range ownerDirs {
-		if !ownerDir.Type().IsDir() {
-			continue
-		}
-		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
-		if err != nil {
-			fatalTestError("unable to read the new repo root: %v\n", err)
-		}
-		for _, repoDir := range repoDirs {
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0o755)
-		}
-	}
 
 	if len(testOpts) > 0 && testOpts[0].SetUp != nil {
 		if err := testOpts[0].SetUp(); err != nil {
@@ -255,24 +233,7 @@ func PrepareTestDatabase() error {
 // by tests that use the above MainTest(..) function.
 func PrepareTestEnv(t testing.TB) {
 	assert.NoError(t, PrepareTestDatabase())
-	assert.NoError(t, util.RemoveAll(setting.RepoRootPath))
 	metaPath := filepath.Join(giteaRoot, "tests", "gitea-repositories-meta")
-	assert.NoError(t, CopyDir(metaPath, setting.RepoRootPath))
-	ownerDirs, err := os.ReadDir(setting.RepoRootPath)
-	assert.NoError(t, err)
-	for _, ownerDir := range ownerDirs {
-		if !ownerDir.Type().IsDir() {
-			continue
-		}
-		repoDirs, err := os.ReadDir(filepath.Join(setting.RepoRootPath, ownerDir.Name()))
-		assert.NoError(t, err)
-		for _, repoDir := range repoDirs {
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "pack"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "objects", "info"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "heads"), 0o755)
-			_ = os.MkdirAll(filepath.Join(setting.RepoRootPath, ownerDir.Name(), repoDir.Name(), "refs", "tag"), 0o755)
-		}
-	}
-
+	assert.NoError(t, SyncDirs(metaPath, setting.RepoRootPath))
 	base.SetupGiteaRoot() // Makes sure GITEA_ROOT is set
 }