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, 167 deletions

diff --git a/models/migrations/v67.go b/models/migrations/v67.go
deleted file mode 100644
index dee744e4d3..0000000000
--- a/models/migrations/v67.go
+++ /dev/null
@@ -1,167 +0,0 @@
-// Copyright 2018 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 (
-	"fmt"
-
-	"code.gitea.io/gitea/modules/setting"
-
-	"xorm.io/xorm"
-)
-
-func removeStaleWatches(x *xorm.Engine) error {
-	type Watch struct {
-		ID     int64
-		UserID int64
-		RepoID int64
-	}
-
-	type IssueWatch struct {
-		ID         int64
-		UserID     int64
-		RepoID     int64
-		IsWatching bool
-	}
-
-	type Repository struct {
-		ID        int64
-		IsPrivate bool
-		OwnerID   int64
-	}
-
-	type Access struct {
-		UserID int64
-		RepoID int64
-		Mode   int
-	}
-
-	const (
-		// AccessModeNone no access
-		AccessModeNone int = iota // 0
-		// AccessModeRead read access
-		AccessModeRead // 1
-	)
-
-	accessLevel := func(e *xorm.Session, userID int64, repo *Repository) (int, error) {
-		mode := AccessModeNone
-		if !repo.IsPrivate {
-			mode = AccessModeRead
-		}
-
-		if userID == 0 {
-			return mode, nil
-		}
-
-		if userID == repo.OwnerID {
-			return 4, nil
-		}
-
-		a := &Access{UserID: userID, RepoID: repo.ID}
-		if has, err := e.Get(a); !has || err != nil {
-			return mode, err
-		}
-		return a.Mode, nil
-	}
-
-	sess := x.NewSession()
-	defer sess.Close()
-	if err := sess.Begin(); err != nil {
-		return err
-	}
-
-	var issueWatch IssueWatch
-	if exist, err := sess.IsTableExist(&issueWatch); err != nil {
-		return fmt.Errorf("IsExist IssueWatch: %v", err)
-	} else if !exist {
-		return nil
-	}
-
-	repoCache := make(map[int64]*Repository)
-	err := sess.BufferSize(setting.Database.IterateBufferSize).Iterate(new(Watch),
-		func(idx int, bean interface{}) error {
-			watch := bean.(*Watch)
-
-			repo := repoCache[watch.RepoID]
-			if repo == nil {
-				repo = &Repository{
-					ID: watch.RepoID,
-				}
-				if _, err := sess.Get(repo); err != nil {
-					return err
-				}
-				repoCache[watch.RepoID] = repo
-			}
-
-			// Remove watches from now unaccessible repositories
-			mode, err := accessLevel(sess, watch.UserID, repo)
-			if err != nil {
-				return err
-			}
-			has := AccessModeRead <= mode
-			if has {
-				return nil
-			}
-
-			if _, err = sess.Delete(&Watch{0, watch.UserID, repo.ID}); err != nil {
-				return err
-			}
-			_, err = sess.Exec("UPDATE `repository` SET num_watches = num_watches - 1 WHERE id = ?", repo.ID)
-
-			return err
-		})
-	if err != nil {
-		return err
-	}
-
-	repoCache = make(map[int64]*Repository)
-	err = sess.BufferSize(setting.Database.IterateBufferSize).
-		Distinct("issue_watch.user_id", "issue.repo_id").
-		Join("INNER", "issue", "issue_watch.issue_id = issue.id").
-		Where("issue_watch.is_watching = ?", true).
-		Iterate(new(IssueWatch),
-			func(idx int, bean interface{}) error {
-				watch := bean.(*IssueWatch)
-
-				repo := repoCache[watch.RepoID]
-				if repo == nil {
-					repo = &Repository{
-						ID: watch.RepoID,
-					}
-					if _, err := sess.Get(repo); err != nil {
-						return err
-					}
-					repoCache[watch.RepoID] = repo
-				}
-
-				// Remove issue watches from now unaccssible repositories
-				mode, err := accessLevel(sess, watch.UserID, repo)
-				if err != nil {
-					return err
-				}
-				has := AccessModeRead <= mode
-				if has {
-					return nil
-				}
-
-				iw := &IssueWatch{
-					IsWatching: false,
-				}
-
-				_, err = sess.
-					Join("INNER", "issue", "`issue`.id = `issue_watch`.issue_id AND `issue`.repo_id = ?", watch.RepoID).
-					Cols("is_watching", "updated_unix").
-					Where("`issue_watch`.user_id = ?", watch.UserID).
-					Update(iw)
-
-				return err
-
-			})
-	if err != nil {
-		return err
-	}
-
-	return sess.Commit()
-}