Remove migration support from versions earlier than 1.6.0 (#10026)

* Remove migration support from versions earlier than 1.6.0

* Remove unused functions

* Update gogs upgrade instructions

* Improve "latest" link as per @jolheiser

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

1 files changed, 0 insertions, 55 deletions

diff --git a/models/migrations/v50.go b/models/migrations/v50.go
deleted file mode 100644
index ddc378b432..0000000000
--- a/models/migrations/v50.go
+++ /dev/null
@@ -1,55 +0,0 @@
-// Copyright 2017 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 migrations
-
-import (
-	"time"
-
-	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/setting"
-
-	"xorm.io/xorm"
-)
-
-func migrateProtectedBranchStruct(x *xorm.Engine) error {
-	type ProtectedBranch struct {
-		ID          int64  `xorm:"pk autoincr"`
-		RepoID      int64  `xorm:"UNIQUE(s)"`
-		BranchName  string `xorm:"UNIQUE(s)"`
-		CanPush     bool
-		Created     time.Time `xorm:"-"`
-		CreatedUnix int64
-		Updated     time.Time `xorm:"-"`
-		UpdatedUnix int64
-	}
-
-	var pbs []ProtectedBranch
-	err := x.Find(&pbs)
-	if err != nil {
-		return err
-	}
-
-	for _, pb := range pbs {
-		if pb.CanPush {
-			if _, err = x.ID(pb.ID).Delete(new(ProtectedBranch)); err != nil {
-				return err
-			}
-		}
-	}
-
-	switch {
-	case setting.Database.UseSQLite3:
-		log.Warn("Unable to drop columns in SQLite")
-	case setting.Database.UseMySQL, setting.Database.UsePostgreSQL, setting.Database.UseMSSQL:
-		if _, err := x.Exec("ALTER TABLE protected_branch DROP COLUMN can_push"); err != nil {
-			// Ignoring this error in case we run this migration second time (after migration reordering)
-			log.Warn("DROP COLUMN can_push (skipping): %v", err)
-		}
-	default:
-		log.Fatal("Unrecognized DB")
-	}
-
-	return nil
-}