Split migrations folder (#21549)

There are too many files in `models/migrations` folder so that I split
them into sub folders.

models/migrations/v1_6/v70.go

@@ -0,0 +1,111 @@
+// 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 v1_6 // nolint
+
+import (
+	"fmt"
+	"time"
+
+	"code.gitea.io/gitea/modules/setting"
+
+	"xorm.io/xorm"
+)
+
+func AddIssueDependencies(x *xorm.Engine) (err error) {
+	type IssueDependency struct {
+		ID           int64     `xorm:"pk autoincr"`
+		UserID       int64     `xorm:"NOT NULL"`
+		IssueID      int64     `xorm:"NOT NULL"`
+		DependencyID int64     `xorm:"NOT NULL"`
+		Created      time.Time `xorm:"-"`
+		CreatedUnix  int64     `xorm:"created"`
+		Updated      time.Time `xorm:"-"`
+		UpdatedUnix  int64     `xorm:"updated"`
+	}
+
+	const (
+		v16UnitTypeCode            = iota + 1 // 1 code
+		v16UnitTypeIssues                     // 2 issues
+		v16UnitTypePRs                        // 3 PRs
+		v16UnitTypeCommits                    // 4 Commits
+		v16UnitTypeReleases                   // 5 Releases
+		v16UnitTypeWiki                       // 6 Wiki
+		v16UnitTypeSettings                   // 7 Settings
+		v16UnitTypeExternalWiki               // 8 ExternalWiki
+		v16UnitTypeExternalTracker            // 9 ExternalTracker
+	)
+
+	if err = x.Sync(new(IssueDependency)); err != nil {
+		return fmt.Errorf("Error creating issue_dependency_table column definition: %w", err)
+	}
+
+	// Update Comment definition
+	// This (copied) struct does only contain fields used by xorm as the only use here is to update the database
+
+	// CommentType defines the comment type
+	type CommentType int
+
+	// TimeStamp defines a timestamp
+	type TimeStamp int64
+
+	type Comment struct {
+		ID               int64 `xorm:"pk autoincr"`
+		Type             CommentType
+		PosterID         int64 `xorm:"INDEX"`
+		IssueID          int64 `xorm:"INDEX"`
+		LabelID          int64
+		OldMilestoneID   int64
+		MilestoneID      int64
+		OldAssigneeID    int64
+		AssigneeID       int64
+		OldTitle         string
+		NewTitle         string
+		DependentIssueID int64
+
+		CommitID int64
+		Line     int64
+		Content  string `xorm:"TEXT"`
+
+		CreatedUnix TimeStamp `xorm:"INDEX created"`
+		UpdatedUnix TimeStamp `xorm:"INDEX updated"`
+
+		// Reference issue in commit message
+		CommitSHA string `xorm:"VARCHAR(40)"`
+	}
+
+	if err = x.Sync(new(Comment)); err != nil {
+		return fmt.Errorf("Error updating issue_comment table column definition: %w", err)
+	}
+
+	// RepoUnit describes all units of a repository
+	type RepoUnit struct {
+		ID          int64
+		RepoID      int64                  `xorm:"INDEX(s)"`
+		Type        int                    `xorm:"INDEX(s)"`
+		Config      map[string]interface{} `xorm:"JSON"`
+		CreatedUnix int64                  `xorm:"INDEX CREATED"`
+		Created     time.Time              `xorm:"-"`
+	}
+
+	// Updating existing issue units
+	units := make([]*RepoUnit, 0, 100)
+	err = x.Where("`type` = ?", v16UnitTypeIssues).Find(&units)
+	if err != nil {
+		return fmt.Errorf("Query repo units: %w", err)
+	}
+	for _, unit := range units {
+		if unit.Config == nil {
+			unit.Config = make(map[string]interface{})
+		}
+		if _, ok := unit.Config["EnableDependencies"]; !ok {
+			unit.Config["EnableDependencies"] = setting.Service.DefaultEnableDependencies
+		}
+		if _, err := x.ID(unit.ID).Cols("config").Update(unit); err != nil {
+			return err
+		}
+	}
+
+	return err
+}