Improve install code to avoid low-level mistakes. (#17779)

* Improve install code to avoid low-level mistakes.

If a user tries to do a re-install in a Gitea database, they gets a warning and double check.
When Gitea runs, it never create empty app.ini automatically.

Also some small (related) refactoring:

* Refactor db.InitEngine related logic make it more clean (especially for the install code)
* Move some i18n strings out from setting.go to make the setting.go can be easily maintained.
* Show errors in CLI code if an incorrect app.ini is used.
* APP_DATA_PATH is created when installing, and checked when starting (no empty directory is created any more).

cmd/cmd.go

@@ -16,6 +16,7 @@ import (
 	"syscall"
 
 	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
 
@@ -57,15 +58,17 @@ func confirm() (bool, error) {
 }
 
 func initDB(ctx context.Context) error {
-	return initDBDisableConsole(ctx, false)
-}
-
-func initDBDisableConsole(ctx context.Context, disableConsole bool) error {
-	setting.NewContext()
+	setting.LoadFromExisting()
 	setting.InitDBConfig()
-	setting.NewXORMLogService(disableConsole)
+	setting.NewXORMLogService(false)
+
+	if setting.Database.Type == "" {
+		log.Fatal(`Database settings are missing from the configuration file: %q.
+Ensure you are running in the correct environment or set the correct configuration file with -c.
+If this is the intended configuration file complete the [database] section.`, setting.CustomConf)
+	}
 	if err := db.InitEngine(ctx); err != nil {
-		return fmt.Errorf("models.SetEngine: %v", err)
+		return fmt.Errorf("unable to initialise the database using the configuration in %q. Error: %v", setting.CustomConf, err)
 	}
 	return nil
 }

cmd/convert.go

@@ -35,7 +35,6 @@ func runConvert(ctx *cli.Context) error {
 	log.Info("Custom path: %s", setting.CustomPath)
 	log.Info("Log path: %s", setting.LogRootPath)
 	log.Info("Configuration file: %s", setting.CustomConf)
-	setting.InitDBConfig()
 
 	if !setting.Database.UseMySQL {
 		fmt.Println("This command can only be used with a MySQL database")

cmd/doctor.go

@@ -87,7 +87,7 @@ func runRecreateTable(ctx *cli.Context) error {
 	golog.SetPrefix("")
 	golog.SetOutput(log.NewLoggerAsWriter("INFO", log.GetLogger(log.DEFAULT)))
 
-	setting.NewContext()
+	setting.LoadFromExisting()
 	setting.InitDBConfig()
 
 	setting.EnableXORMLog = ctx.Bool("debug")

cmd/dump.go

@@ -159,7 +159,8 @@ func runDump(ctx *cli.Context) error {
 			fatal("Deleting default logger failed. Can not write to stdout: %v", err)
 		}
 	}
-	setting.NewContext()
+	setting.LoadFromExisting()
+
 	// make sure we are logging to the console no matter what the configuration tells us do to
 	if _, err := setting.Cfg.Section("log").NewKey("MODE", "console"); err != nil {
 		fatal("Setting logging mode to console failed: %v", err)

cmd/dump_repo.go

@@ -88,7 +88,6 @@ func runDumpRepository(ctx *cli.Context) error {
 	log.Info("Custom path: %s", setting.CustomPath)
 	log.Info("Log path: %s", setting.LogRootPath)
 	log.Info("Configuration file: %s", setting.CustomConf)
-	setting.InitDBConfig()
 
 	var (
 		serviceType structs.GitServiceType

cmd/embedded.go

@@ -115,7 +115,7 @@ func initEmbeddedExtractor(c *cli.Context) error {
 	log.DelNamedLogger(log.DEFAULT)
 
 	// Read configuration file
-	setting.NewContext()
+	setting.LoadAllowEmpty()
 
 	pats, err := getPatterns(c.Args())
 	if err != nil {

cmd/mailer.go

@@ -18,7 +18,7 @@ func runSendMail(c *cli.Context) error {
 	ctx, cancel := installSignals()
 	defer cancel()
 
-	setting.NewContext()
+	setting.LoadFromExisting()
 
 	if err := argsSet(c, "title"); err != nil {
 		return err

cmd/migrate.go

@@ -36,7 +36,6 @@ func runMigrate(ctx *cli.Context) error {
 	log.Info("Custom path: %s", setting.CustomPath)
 	log.Info("Log path: %s", setting.LogRootPath)
 	log.Info("Configuration file: %s", setting.CustomConf)
-	setting.InitDBConfig()
 
 	if err := db.InitEngineWithMigration(context.Background(), migrations.Migrate); err != nil {
 		log.Fatal("Failed to initialize ORM engine: %v", err)

cmd/migrate_storage.go

@@ -121,7 +121,6 @@ func runMigrateStorage(ctx *cli.Context) error {
 	log.Info("Custom path: %s", setting.CustomPath)
 	log.Info("Log path: %s", setting.LogRootPath)
 	log.Info("Configuration file: %s", setting.CustomConf)
-	setting.InitDBConfig()
 
 	if err := db.InitEngineWithMigration(context.Background(), migrations.Migrate); err != nil {
 		log.Fatal("Failed to initialize ORM engine: %v", err)

cmd/restore_repo.go

@@ -50,7 +50,7 @@ func runRestoreRepository(c *cli.Context) error {
 	ctx, cancel := installSignals()
 	defer cancel()
 
-	setting.NewContext()
+	setting.LoadFromExisting()
 
 	statusCode, errStr := private.RestoreRepo(
 		ctx,

cmd/serv.go

@@ -58,7 +58,7 @@ func setup(logPath string, debug bool) {
 	} else {
 		_ = log.NewLogger(1000, "console", "console", `{"level":"fatal","stacktracelevel":"NONE","stderr":true}`)
 	}
-	setting.NewContext()
+	setting.LoadFromExisting()
 	if debug {
 		setting.RunMode = "dev"
 	}

cmd/web.go

@@ -124,6 +124,10 @@ func runWeb(ctx *cli.Context) error {
 		}
 		c := install.Routes()
 		err := listen(c, false)
+		if err != nil {
+			log.Critical("Unable to open listener for installer. Is Gitea already running?")
+			graceful.GetManager().DoGracefulShutdown()
+		}
 		select {
 		case <-graceful.GetManager().IsShutdown():
 			<-graceful.GetManager().Done()
@@ -145,7 +149,15 @@ func runWeb(ctx *cli.Context) error {
 
 	log.Info("Global init")
 	// Perform global initialization
-	routers.GlobalInit(graceful.GetManager().HammerContext())
+	setting.LoadFromExisting()
+	routers.GlobalInitInstalled(graceful.GetManager().HammerContext())
+
+	// We check that AppDataPath exists here (it should have been created during installation)
+	// We can't check it in `GlobalInitInstalled`, because some integration tests
+	// use cmd -> GlobalInitInstalled, but the AppDataPath doesn't exist during those tests.
+	if _, err := os.Stat(setting.AppDataPath); err != nil {
+		log.Fatal("Can not find APP_DATA_PATH '%s'", setting.AppDataPath)
+	}
 
 	// Override the provided port number within the configuration
 	if ctx.IsSet("port") {

contrib/environment-to-ini/environment-to-ini.go

@@ -156,6 +156,7 @@ func runEnvironmentToIni(c *cli.Context) error {
 		destination = setting.CustomConf
 	}
 	if destination != setting.CustomConf || changed {
+		log.Info("Settings saved to: %q", destination)
 		err = cfg.SaveTo(destination)
 		if err != nil {
 			return err

contrib/pr/checkout.go

@@ -49,7 +49,7 @@ func runPR() {
 		log.Fatal(err)
 	}
 	setting.SetCustomPathAndConf("", "", "")
-	setting.NewContext()
+	setting.LoadAllowEmpty()
 
 	setting.RepoRootPath, err = os.MkdirTemp(os.TempDir(), "repos")
 	if err != nil {

integrations/integration_test.go

@@ -164,8 +164,8 @@ func initIntegrationTest() {
 	}
 
 	setting.SetCustomPathAndConf("", "", "")
-	setting.NewContext()
-	util.RemoveAll(models.LocalCopyPath())
+	setting.LoadForTest()
+	_ = util.RemoveAll(models.LocalCopyPath())
 	git.CheckLFSVersion()
 	setting.InitDBConfig()
 	if err := storage.Init(); err != nil {
@@ -240,7 +240,8 @@ func initIntegrationTest() {
 		}
 		defer db.Close()
 	}
-	routers.GlobalInit(graceful.GetManager().HammerContext())
+
+	routers.GlobalInitInstalled(graceful.GetManager().HammerContext())
 }
 
 func prepareTestEnv(t testing.TB, skip ...int) func() {
@@ -254,6 +255,7 @@ func prepareTestEnv(t testing.TB, skip ...int) func() {
 	assert.NoError(t, util.RemoveAll(setting.RepoRootPath))
 
 	assert.NoError(t, util.CopyDir(path.Join(filepath.Dir(setting.AppPath), "integrations/gitea-repositories-meta"), setting.RepoRootPath))
+
 	return deferFn
 }
 

integrations/migration-test/migration_test.go

@@ -56,7 +56,7 @@ func initMigrationTest(t *testing.T) func() {
 		setting.CustomConf = giteaConf
 	}
 
-	setting.NewContext()
+	setting.LoadForTest()
 
 	assert.True(t, len(setting.RepoRootPath) != 0)
 	assert.NoError(t, util.RemoveAll(setting.RepoRootPath))

models/db/engine.go

@@ -8,7 +8,6 @@ package db
 import (
 	"context"
 	"database/sql"
-	"errors"
 	"fmt"
 	"io"
 	"reflect"
@@ -92,8 +91,8 @@ func init() {
 	}
 }
 
-// NewEngine returns a new xorm engine from the configuration
-func NewEngine() (*xorm.Engine, error) {
+// newXORMEngine returns a new XORM engine from the configuration
+func newXORMEngine() (*xorm.Engine, error) {
 	connStr, err := setting.DBConnStr()
 	if err != nil {
 		return nil, err
@@ -126,40 +125,49 @@ func SyncAllTables() error {
 	return x.StoreEngine("InnoDB").Sync2(tables...)
 }
 
-// InitEngine sets the xorm.Engine
-func InitEngine(ctx context.Context) (err error) {
-	x, err = NewEngine()
+// InitEngine initializes the xorm.Engine and sets it as db.DefaultContext
+func InitEngine(ctx context.Context) error {
+	xormEngine, err := newXORMEngine()
 	if err != nil {
-		return fmt.Errorf("Failed to connect to database: %v", err)
+		return fmt.Errorf("failed to connect to database: %v", err)
 	}
 
-	x.SetMapper(names.GonicMapper{})
+	xormEngine.SetMapper(names.GonicMapper{})
 	// WARNING: for serv command, MUST remove the output to os.stdout,
 	// so use log file to instead print to stdout.
-	x.SetLogger(NewXORMLogger(setting.Database.LogSQL))
-	x.ShowSQL(setting.Database.LogSQL)
-	x.SetMaxOpenConns(setting.Database.MaxOpenConns)
-	x.SetMaxIdleConns(setting.Database.MaxIdleConns)
-	x.SetConnMaxLifetime(setting.Database.ConnMaxLifetime)
+	xormEngine.SetLogger(NewXORMLogger(setting.Database.LogSQL))
+	xormEngine.ShowSQL(setting.Database.LogSQL)
+	xormEngine.SetMaxOpenConns(setting.Database.MaxOpenConns)
+	xormEngine.SetMaxIdleConns(setting.Database.MaxIdleConns)
+	xormEngine.SetConnMaxLifetime(setting.Database.ConnMaxLifetime)
+	xormEngine.SetDefaultContext(ctx)
+
+	SetDefaultEngine(ctx, xormEngine)
+	return nil
+}
 
+// SetDefaultEngine sets the default engine for db
+func SetDefaultEngine(ctx context.Context, eng *xorm.Engine) {
+	x = eng
 	DefaultContext = &Context{
 		Context: ctx,
 		e:       x,
 	}
-	x.SetDefaultContext(ctx)
-	return nil
 }
 
-// SetEngine is used by unit test code
-func SetEngine(eng *xorm.Engine) {
-	x = eng
-	DefaultContext = &Context{
-		Context: context.Background(),
-		e:       x,
+// UnsetDefaultEngine closes and unsets the default engine
+// We hope the SetDefaultEngine and UnsetDefaultEngine can be paired, but it's impossible now,
+// there are many calls to InitEngine -> SetDefaultEngine directly to overwrite the `x` and DefaultContext without close
+// Global database engine related functions are all racy and there is no graceful close right now.
+func UnsetDefaultEngine() {
+	if x != nil {
+		_ = x.Close()
+		x = nil
 	}
+	DefaultContext = nil
 }
 
-// InitEngineWithMigration initializes a new xorm.Engine
+// InitEngineWithMigration initializes a new xorm.Engine and sets it as the db.DefaultContext
 // This function must never call .Sync2() if the provided migration function fails.
 // When called from the "doctor" command, the migration function is a version check
 // that prevents the doctor from fixing anything in the database if the migration level
@@ -226,14 +234,6 @@ func NamesToBean(names ...string) ([]interface{}, error) {
 	return beans, nil
 }
 
-// Ping tests if database is alive
-func Ping() error {
-	if x != nil {
-		return x.Ping()
-	}
-	return errors.New("database not configured")
-}
-
 // DumpDatabase dumps all data from database according the special database SQL syntax to file system.
 func DumpDatabase(filePath, dbType string) error {
 	var tbs []*schemas.Table
@@ -291,11 +291,3 @@ func GetMaxID(beanOrTableName interface{}) (maxID int64, err error) {
 	_, err = x.Select("MAX(id)").Table(beanOrTableName).Get(&maxID)
 	return
 }
-
-// FindByMaxID filled results as the condition from database
-func FindByMaxID(maxID int64, limit int, results interface{}) error {
-	return x.Where("id <= ?", maxID).
-		OrderBy("id DESC").
-		Limit(limit).
-		Find(results)
-}

models/db/install/db.go

@@ -0,0 +1,65 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package install
+
+import (
+	"code.gitea.io/gitea/models/db"
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func getXORMEngine() *xorm.Engine {
+	return db.DefaultContext.(*db.Context).Engine().(*xorm.Engine)
+}
+
+// CheckDatabaseConnection checks the database connection
+func CheckDatabaseConnection() error {
+	e := db.GetEngine(db.DefaultContext)
+	_, err := e.Exec("SELECT 1")
+	return err
+}
+
+// GetMigrationVersion gets the database migration version
+func GetMigrationVersion() (int64, error) {
+	var installedDbVersion int64
+	x := getXORMEngine()
+	exist, err := x.IsTableExist("version")
+	if err != nil {
+		return 0, err
+	}
+	if !exist {
+		return 0, nil
+	}
+	_, err = x.Table("version").Cols("version").Get(&installedDbVersion)
+	if err != nil {
+		return 0, err
+	}
+	return installedDbVersion, nil
+}
+
+// HasPostInstallationUsers checks whether there are users after installation
+func HasPostInstallationUsers() (bool, error) {
+	x := getXORMEngine()
+	exist, err := x.IsTableExist("user")
+	if err != nil {
+		return false, err
+	}
+	if !exist {
+		return false, nil
+	}
+
+	// if there are 2 or more users in database, we consider there are users created after installation
+	threshold := 2
+	if !setting.IsProd {
+		// to debug easily, with non-prod RUN_MODE, we only check the count to 1
+		threshold = 1
+	}
+	res, err := x.Table("user").Cols("id").Limit(threshold).Query()
+	if err != nil {
+		return false, err
+	}
+	return len(res) >= threshold, nil
+}