Reorder migrations, skip errors if running migration again (#3160)

* Reorder migrations, skip errors if running migration again

* Rename migration file names to match migration version

* Add note about ingored error

models/migrations/v41.go

@@ -7,36 +7,63 @@ package migrations
 import (
 	"fmt"
 
-	"code.gitea.io/gitea/models"
-
 	"github.com/go-xorm/xorm"
 )
 
-func addDefaultValueToUserProhibitLogin(x *xorm.Engine) (err error) {
-	user := &models.User{
-		ProhibitLogin: false,
+func removeDuplicateUnitTypes(x *xorm.Engine) error {
+	// RepoUnit describes all units of a repository
+	type RepoUnit struct {
+		RepoID int64
+		Type   int
 	}
 
-	if _, err := x.Where("`prohibit_login` IS NULL").Cols("prohibit_login").Update(user); err != nil {
+	// Enumerate all the unit types
+	const (
+		UnitTypeCode            = iota + 1 // 1 code
+		UnitTypeIssues                     // 2 issues
+		UnitTypePullRequests               // 3 PRs
+		UnitTypeReleases                   // 4 Releases
+		UnitTypeWiki                       // 5 Wiki
+		UnitTypeExternalWiki               // 6 ExternalWiki
+		UnitTypeExternalTracker            // 7 ExternalTracker
+	)
+
+	var externalIssueRepoUnits []RepoUnit
+	err := x.Where("type = ?", UnitTypeExternalTracker).Find(&externalIssueRepoUnits)
+	if err != nil {
+		return fmt.Errorf("Query repositories: %v", err)
+	}
+
+	var externalWikiRepoUnits []RepoUnit
+	err = x.Where("type = ?", UnitTypeExternalWiki).Find(&externalWikiRepoUnits)
+	if err != nil {
+		return fmt.Errorf("Query repositories: %v", err)
+	}
+
+	sess := x.NewSession()
+	defer sess.Close()
+
+	if err := sess.Begin(); err != nil {
 		return err
 	}
 
-	dialect := x.Dialect().DriverName()
-
-	switch dialect {
-	case "mysql":
-		_, err = x.Exec("ALTER TABLE user MODIFY `prohibit_login` tinyint(1) NOT NULL DEFAULT 0")
-	case "postgres":
-		_, err = x.Exec("ALTER TABLE \"user\" ALTER COLUMN `prohibit_login` SET NOT NULL, ALTER COLUMN `prohibit_login` SET DEFAULT false")
-	case "mssql":
-		// xorm already set DEFAULT 0 for data type BIT in mssql
-		_, err = x.Exec(`ALTER TABLE [user] ALTER COLUMN "prohibit_login" BIT NOT NULL`)
-	case "sqlite3":
+	for _, repoUnit := range externalIssueRepoUnits {
+		if _, err = sess.Delete(&RepoUnit{
+			RepoID: repoUnit.RepoID,
+			Type:   UnitTypeIssues,
+		}); err != nil {
+			return fmt.Errorf("Delete repo unit: %v", err)
+		}
 	}
 
-	if err != nil {
-		return fmt.Errorf("Error changing user prohibit_login column definition: %v", err)
+	for _, repoUnit := range externalWikiRepoUnits {
+		if _, err = sess.Delete(&RepoUnit{
+			RepoID: repoUnit.RepoID,
+			Type:   UnitTypeWiki,
+		}); err != nil {
+			return fmt.Errorf("Delete repo unit: %v", err)
+		}
 	}
 
-	return err
+	return sess.Commit()
 }