githaven/models/repo.go

// Copyright 2014 The Gogs Authors. All rights reserved.
// 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 models

import (
	"context"
	"errors"
	"fmt"
	"html/template"
	"unicode/utf8"

	// Needed for jpeg support
	_ "image/jpeg"
	"io/ioutil"
	"net"
	"net/url"
	"os"
	"path"
	"path/filepath"
	"sort"
	"strconv"
	"strings"
	"time"

	"code.gitea.io/gitea/modules/log"
	"code.gitea.io/gitea/modules/markup"
	"code.gitea.io/gitea/modules/options"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/modules/storage"
	api "code.gitea.io/gitea/modules/structs"
	"code.gitea.io/gitea/modules/timeutil"
	"code.gitea.io/gitea/modules/util"

	"xorm.io/builder"
)

var (
	// ErrMirrorNotExist mirror does not exist error
	ErrMirrorNotExist = errors.New("Mirror does not exist")

	// ErrNameEmpty name is empty error
	ErrNameEmpty = errors.New("Name is empty")
)

var (
	// Gitignores contains the gitiginore files
	Gitignores []string

	// Licenses contains the license files
	Licenses []string

	// Readmes contains the readme files
	Readmes []string

	// LabelTemplates contains the label template files and the list of labels for each file
	LabelTemplates map[string]string

	// ItemsPerPage maximum items per page in forks, watchers and stars of a repo
	ItemsPerPage = 40
)

// loadRepoConfig loads the repository config
func loadRepoConfig() {
	// Load .gitignore and license files and readme templates.
	types := []string{"gitignore", "license", "readme", "label"}
	typeFiles := make([][]string, 4)
	for i, t := range types {
		files, err := options.Dir(t)
		if err != nil {
			log.Fatal("Failed to get %s files: %v", t, err)
		}
		customPath := path.Join(setting.CustomPath, "options", t)
		isDir, err := util.IsDir(customPath)
		if err != nil {
			log.Fatal("Failed to get custom %s files: %v", t, err)
		}
		if isDir {
			customFiles, err := util.StatDir(customPath)
			if err != nil {
				log.Fatal("Failed to get custom %s files: %v", t, err)
			}

			for _, f := range customFiles {
				if !util.IsStringInSlice(f, files, true) {
					files = append(files, f)
				}
			}
		}
		typeFiles[i] = files
	}

	Gitignores = typeFiles[0]
	Licenses = typeFiles[1]
	Readmes = typeFiles[2]
	LabelTemplatesFiles := typeFiles[3]
	sort.Strings(Gitignores)
	sort.Strings(Licenses)
	sort.Strings(Readmes)
	sort.Strings(LabelTemplatesFiles)

	// Load label templates
	LabelTemplates = make(map[string]string)
	for _, templateFile := range LabelTemplatesFiles {
		labels, err := LoadLabelsFormatted(templateFile)
		if err != nil {
			log.Error("Failed to load labels: %v", err)
		}
		LabelTemplates[templateFile] = labels
	}

	// Filter out invalid names and promote preferred licenses.
	sortedLicenses := make([]string, 0, len(Licenses))
	for _, name := range setting.Repository.PreferredLicenses {
		if util.IsStringInSlice(name, Licenses, true) {
			sortedLicenses = append(sortedLicenses, name)
		}
	}
	for _, name := range Licenses {
		if !util.IsStringInSlice(name, setting.Repository.PreferredLicenses, true) {
			sortedLicenses = append(sortedLicenses, name)
		}
	}
	Licenses = sortedLicenses
}

// NewRepoContext creates a new repository context
func NewRepoContext() {
	loadRepoConfig()
	loadUnitConfig()

	RemoveAllWithNotice("Clean up repository temporary data", filepath.Join(setting.AppDataPath, "tmp"))
}

// RepositoryStatus defines the status of repository
type RepositoryStatus int

// all kinds of RepositoryStatus
const (
	RepositoryReady         RepositoryStatus = iota // a normal repository
	RepositoryBeingMigrated                         // repository is migrating
)

// TrustModelType defines the types of trust model for this repository
type TrustModelType int

// kinds of TrustModel
const (
	DefaultTrustModel TrustModelType = iota // default trust model
	CommitterTrustModel
	CollaboratorTrustModel
	CollaboratorCommitterTrustModel
)

// String converts a TrustModelType to a string
func (t TrustModelType) String() string {
	switch t {
	case DefaultTrustModel:
		return "default"
	case CommitterTrustModel:
		return "committer"
	case CollaboratorTrustModel:
		return "collaborator"
	case CollaboratorCommitterTrustModel:
		return "collaboratorcommitter"
	}
	return "default"
}

// ToTrustModel converts a string to a TrustModelType
func ToTrustModel(model string) TrustModelType {
	switch strings.ToLower(strings.TrimSpace(model)) {
	case "default":
		return DefaultTrustModel
	case "collaborator":
		return CollaboratorTrustModel
	case "committer":
		return CommitterTrustModel
	case "collaboratorcommitter":
		return CollaboratorCommitterTrustModel
	}
	return DefaultTrustModel
}

// Repository represents a git repository.
type Repository struct {
	ID                  int64 `xorm:"pk autoincr"`
	OwnerID             int64 `xorm:"UNIQUE(s) index"`
	OwnerName           string
	Owner               *User              `xorm:"-"`
	LowerName           string             `xorm:"UNIQUE(s) INDEX NOT NULL"`
	Name                string             `xorm:"INDEX NOT NULL"`
	Description         string             `xorm:"TEXT"`
	Website             string             `xorm:"VARCHAR(2048)"`
	OriginalServiceType api.GitServiceType `xorm:"index"`
	OriginalURL         string             `xorm:"VARCHAR(2048)"`
	DefaultBranch       string

	NumWatches          int
	NumStars            int
	NumForks            int
	NumIssues           int
	NumClosedIssues     int
	NumOpenIssues       int `xorm:"-"`
	NumPulls            int
	NumClosedPulls      int
	NumOpenPulls        int `xorm:"-"`
	NumMilestones       int `xorm:"NOT NULL DEFAULT 0"`
	NumClosedMilestones int `xorm:"NOT NULL DEFAULT 0"`
	NumOpenMilestones   int `xorm:"-"`
	NumProjects         int `xorm:"NOT NULL DEFAULT 0"`
	NumClosedProjects   int `xorm:"NOT NULL DEFAULT 0"`
	NumOpenProjects     int `xorm:"-"`

	IsPrivate  bool `xorm:"INDEX"`
	IsEmpty    bool `xorm:"INDEX"`
	IsArchived bool `xorm:"INDEX"`
	IsMirror   bool `xorm:"INDEX"`
	*Mirror    `xorm:"-"`
	Status     RepositoryStatus `xorm:"NOT NULL DEFAULT 0"`

	RenderingMetas         map[string]string `xorm:"-"`
	DocumentRenderingMetas map[string]string `xorm:"-"`
	Units                  []*RepoUnit       `xorm:"-"`
	PrimaryLanguage        *LanguageStat     `xorm:"-"`

	IsFork                          bool               `xorm:"INDEX NOT NULL DEFAULT false"`
	ForkID                          int64              `xorm:"INDEX"`
	BaseRepo                        *Repository        `xorm:"-"`
	IsTemplate                      bool               `xorm:"INDEX NOT NULL DEFAULT false"`
	TemplateID                      int64              `xorm:"INDEX"`
	TemplateRepo                    *Repository        `xorm:"-"`
	Size                            int64              `xorm:"NOT NULL DEFAULT 0"`
	CodeIndexerStatus               *RepoIndexerStatus `xorm:"-"`
	StatsIndexerStatus              *RepoIndexerStatus `xorm:"-"`
	IsFsckEnabled                   bool               `xorm:"NOT NULL DEFAULT true"`
	CloseIssuesViaCommitInAnyBranch bool               `xorm:"NOT NULL DEFAULT false"`
	Topics                          []string           `xorm:"TEXT JSON"`

	TrustModel TrustModelType

	// Avatar: ID(10-20)-md5(32) - must fit into 64 symbols
	Avatar string `xorm:"VARCHAR(64)"`

	CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
	UpdatedUnix timeutil.TimeStamp `xorm:"INDEX updated"`
}

// SanitizedOriginalURL returns a sanitized OriginalURL
func (repo *Repository) SanitizedOriginalURL() string {
	if repo.OriginalURL == "" {
		return ""
	}
	return util.SanitizeURLCredentials(repo.OriginalURL, false)
}

// ColorFormat returns a colored string to represent this repo
func (repo *Repository) ColorFormat(s fmt.State) {
	log.ColorFprintf(s, "%d:%s/%s",
		log.NewColoredIDValue(repo.ID),
		repo.OwnerName,
		repo.Name)
}

// IsBeingMigrated indicates that repository is being migrated
func (repo *Repository) IsBeingMigrated() bool {
	return repo.Status == RepositoryBeingMigrated
}

// IsBeingCreated indicates that repository is being migrated or forked
func (repo *Repository) IsBeingCreated() bool {
	return repo.IsBeingMigrated()
}

// AfterLoad is invoked from XORM after setting the values of all fields of this object.
func (repo *Repository) AfterLoad() {
	// FIXME: use models migration to solve all at once.
	if len(repo.DefaultBranch) == 0 {
		repo.DefaultBranch = setting.Repository.DefaultBranch
	}

	repo.NumOpenIssues = repo.NumIssues - repo.NumClosedIssues
	repo.NumOpenPulls = repo.NumPulls - repo.NumClosedPulls
	repo.NumOpenMilestones = repo.NumMilestones - repo.NumClosedMilestones
	repo.NumOpenProjects = repo.NumProjects - repo.NumClosedProjects
}

// MustOwner always returns a valid *User object to avoid
// conceptually impossible error handling.
// It creates a fake object that contains error details
// when error occurs.
func (repo *Repository) MustOwner() *User {
	return repo.mustOwner(x)
}

// FullName returns the repository full name
func (repo *Repository) FullName() string {
	return repo.OwnerName + "/" + repo.Name
}

// HTMLURL returns the repository HTML URL
func (repo *Repository) HTMLURL() string {
	return setting.AppURL + repo.FullName()
}

// CommitLink make link to by commit full ID
// note: won't check whether it's an right id
func (repo *Repository) CommitLink(commitID string) (result string) {
	if commitID == "" || commitID == "0000000000000000000000000000000000000000" {
		result = ""
	} else {
		result = repo.HTMLURL() + "/commit/" + commitID
	}
	return
}

// APIURL returns the repository API URL
func (repo *Repository) APIURL() string {
	return setting.AppURL + path.Join("api/v1/repos", repo.FullName())
}

// GetCommitsCountCacheKey returns cache key used for commits count caching.
func (repo *Repository) GetCommitsCountCacheKey(contextName string, isRef bool) string {
	var prefix string
	if isRef {
		prefix = "ref"
	} else {
		prefix = "commit"
	}
	return fmt.Sprintf("commits-count-%d-%s-%s", repo.ID, prefix, contextName)
}

func (repo *Repository) getUnits(e Engine) (err error) {
	if repo.Units != nil {
		return nil
	}

	repo.Units, err = getUnitsByRepoID(e, repo.ID)
	log.Trace("repo.Units: %-+v", repo.Units)
	return err
}

// CheckUnitUser check whether user could visit the unit of this repository
func (repo *Repository) CheckUnitUser(user *User, unitType UnitType) bool {
	return repo.checkUnitUser(x, user, unitType)
}

func (repo *Repository) checkUnitUser(e Engine, user *User, unitType UnitType) bool {
	if user.IsAdmin {
		return true
	}
	perm, err := getUserRepoPermission(e, repo, user)
	if err != nil {
		log.Error("getUserRepoPermission(): %v", err)
		return false
	}

	return perm.CanRead(unitType)
}

// UnitEnabled if this repository has the given unit enabled
func (repo *Repository) UnitEnabled(tp UnitType) bool {
	if err := repo.getUnits(x); err != nil {
		log.Warn("Error loading repository (ID: %d) units: %s", repo.ID, err.Error())
	}
	for _, unit := range repo.Units {
		if unit.Type == tp {
			return true
		}
	}
	return false
}

// ErrUnitTypeNotExist represents a "UnitTypeNotExist" kind of error.
type ErrUnitTypeNotExist struct {
	UT UnitType
}

// IsErrUnitTypeNotExist checks if an error is a ErrUnitNotExist.
func IsErrUnitTypeNotExist(err error) bool {
	_, ok := err.(ErrUnitTypeNotExist)
	return ok
}

func (err ErrUnitTypeNotExist) Error() string {
	return fmt.Sprintf("Unit type does not exist: %s", err.UT.String())
}

// MustGetUnit always returns a RepoUnit object
func (repo *Repository) MustGetUnit(tp UnitType) *RepoUnit {
	ru, err := repo.GetUnit(tp)
	if err == nil {
		return ru
	}

	if tp == UnitTypeExternalWiki {
		return &RepoUnit{
			Type:   tp,
			Config: new(ExternalWikiConfig),
		}
	} else if tp == UnitTypeExternalTracker {
		return &RepoUnit{
			Type:   tp,
			Config: new(ExternalTrackerConfig),
		}
	} else if tp == UnitTypePullRequests {
		return &RepoUnit{
			Type:   tp,
			Config: new(PullRequestsConfig),
		}
	} else if tp == UnitTypeIssues {
		return &RepoUnit{
			Type:   tp,
			Config: new(IssuesConfig),
		}
	}
	return &RepoUnit{
		Type:   tp,
		Config: new(UnitConfig),
	}
}

// GetUnit returns a RepoUnit object
func (repo *Repository) GetUnit(tp UnitType) (*RepoUnit, error) {
	return repo.getUnit(x, tp)
}

func (repo *Repository) getUnit(e Engine, tp UnitType) (*RepoUnit, error) {
	if err := repo.getUnits(e); err != nil {
		return nil, err
	}
	for _, unit := range repo.Units {
		if unit.Type == tp {
			return unit, nil
		}
	}
	return nil, ErrUnitTypeNotExist{tp}
}

func (repo *Repository) getOwner(e Engine) (err error) {
	if repo.Owner != nil {
		return nil
	}

	repo.Owner, err = getUserByID(e, repo.OwnerID)
	return err
}

// GetOwner returns the repository owner
func (repo *Repository) GetOwner() error {
	return repo.getOwner(x)
}

func (repo *Repository) mustOwner(e Engine) *User {
	if err := repo.getOwner(e); err != nil {
		return &User{
			Name:     "error",
			FullName: err.Error(),
		}
	}

	return repo.Owner
}

// ComposeMetas composes a map of metas for properly rendering issue links and external issue trackers.
func (repo *Repository) ComposeMetas() map[string]string {
	if len(repo.RenderingMetas) == 0 {
		metas := map[string]string{
			"user":     repo.OwnerName,
			"repo":     repo.Name,
			"repoPath": repo.RepoPath(),
			"mode":     "comment",
		}

		unit, err := repo.GetUnit(UnitTypeExternalTracker)
		if err == nil {
			metas["format"] = unit.ExternalTrackerConfig().ExternalTrackerFormat
			switch unit.ExternalTrackerConfig().ExternalTrackerStyle {
			case markup.IssueNameStyleAlphanumeric:
				metas["style"] = markup.IssueNameStyleAlphanumeric
			default:
				metas["style"] = markup.IssueNameStyleNumeric
			}
		}

		repo.MustOwner()
		if repo.Owner.IsOrganization() {
			teams := make([]string, 0, 5)
			_ = x.Table("team_repo").
				Join("INNER", "team", "team.id = team_repo.team_id").
				Where("team_repo.repo_id = ?", repo.ID).
				Select("team.lower_name").
				OrderBy("team.lower_name").
				Find(&teams)
			metas["teams"] = "," + strings.Join(teams, ",") + ","
			metas["org"] = strings.ToLower(repo.OwnerName)
		}

		repo.RenderingMetas = metas
	}
	return repo.RenderingMetas
}

// ComposeDocumentMetas composes a map of metas for properly rendering documents
func (repo *Repository) ComposeDocumentMetas() map[string]string {
	if len(repo.DocumentRenderingMetas) == 0 {
		metas := map[string]string{}
		for k, v := range repo.ComposeMetas() {
			metas[k] = v
		}
		metas["mode"] = "document"
		repo.DocumentRenderingMetas = metas
	}
	return repo.DocumentRenderingMetas
}

// DeleteWiki removes the actual and local copy of repository wiki.
func (repo *Repository) DeleteWiki() error {
	return repo.deleteWiki(x)
}

func (repo *Repository) deleteWiki(e Engine) error {
	wikiPaths := []string{repo.WikiPath()}
	for _, wikiPath := range wikiPaths {
		removeAllWithNotice(e, "Delete repository wiki", wikiPath)
	}

	_, err := e.Where("repo_id = ?", repo.ID).And("type = ?", UnitTypeWiki).Delete(new(RepoUnit))
	return err
}

func (repo *Repository) getAssignees(e Engine) (_ []*User, err error) {
	if err = repo.getOwner(e); err != nil {
		return nil, err
	}

	accesses := make([]*Access, 0, 10)
	if err = e.
		Where("repo_id = ? AND mode >= ?", repo.ID, AccessModeWrite).
		Find(&accesses); err != nil {
		return nil, err
	}

	// Leave a seat for owner itself to append later, but if owner is an organization
	// and just waste 1 unit is cheaper than re-allocate memory once.
	users := make([]*User, 0, len(accesses)+1)
	if len(accesses) > 0 {
		userIDs := make([]int64, len(accesses))
		for i := 0; i < len(accesses); i++ {
			userIDs[i] = accesses[i].UserID
		}

		if err = e.In("id", userIDs).Find(&users); err != nil {
			return nil, err
		}
	}
	if !repo.Owner.IsOrganization() {
		users = append(users, repo.Owner)
	}

	return users, nil
}

// GetAssignees returns all users that have write access and can be assigned to issues
// of the repository,
func (repo *Repository) GetAssignees() (_ []*User, err error) {
	return repo.getAssignees(x)
}

func (repo *Repository) getReviewers(e Engine, doerID, posterID int64) ([]*User, error) {
	// Get the owner of the repository - this often already pre-cached and if so saves complexity for the following queries
	if err := repo.getOwner(e); err != nil {
		return nil, err
	}

	var users []*User

	if repo.IsPrivate ||
		(repo.Owner.IsOrganization() && repo.Owner.Visibility == api.VisibleTypePrivate) {
		// This a private repository:
		// Anyone who can read the repository is a requestable reviewer
		if err := e.
			SQL("SELECT * FROM `user` WHERE id in (SELECT user_id FROM `access` WHERE repo_id = ? AND mode >= ? AND user_id NOT IN ( ?, ?)) ORDER BY name",
				repo.ID, AccessModeRead,
				doerID, posterID).
			Find(&users); err != nil {
			return nil, err
		}

		return users, nil
	}

	// This is a "public" repository:
	// Any user that has write access or who is a watcher can be requested to review
	if err := e.
		SQL("SELECT * FROM `user` WHERE id IN ( "+
			"SELECT user_id FROM `access` WHERE repo_id = ? AND mode >= ? AND user_id NOT IN ( ?, ?) "+
			"UNION "+
			"SELECT user_id FROM `watch` WHERE repo_id = ? AND user_id NOT IN ( ?, ?) AND mode IN (?, ?) "+
			") ORDER BY name",
			repo.ID, AccessModeRead, doerID, posterID,
			repo.ID, doerID, posterID, RepoWatchModeNormal, RepoWatchModeAuto).
		Find(&users); err != nil {
		return nil, err
	}

	return users, nil
}

// GetReviewers get all users can be requested to review:
// * for private repositories this returns all users that have read access or higher to the repository.
// * for public repositories this returns all users that have write access or higher to the repository,
// and all repo watchers.
// TODO: may be we should have a busy choice for users to block review request to them.
func (repo *Repository) GetReviewers(doerID, posterID int64) ([]*User, error) {
	return repo.getReviewers(x, doerID, posterID)
}

// GetReviewerTeams get all teams can be requested to review
func (repo *Repository) GetReviewerTeams() ([]*Team, error) {
	if err := repo.GetOwner(); err != nil {
		return nil, err
	}
	if !repo.Owner.IsOrganization() {
		return nil, nil
	}

	teams, err := GetTeamsWithAccessToRepo(repo.OwnerID, repo.ID, AccessModeRead)
	if err != nil {
		return nil, err
	}

	return teams, err
}

// GetMilestoneByID returns the milestone belongs to repository by given ID.
func (repo *Repository) GetMilestoneByID(milestoneID int64) (*Milestone, error) {
	return GetMilestoneByRepoID(repo.ID, milestoneID)
}

// IssueStats returns number of open and closed repository issues by given filter mode.
func (repo *Repository) IssueStats(uid int64, filterMode int, isPull bool) (int64, int64) {
	return GetRepoIssueStats(repo.ID, uid, filterMode, isPull)
}

// GetMirror sets the repository mirror, returns an error upon failure
func (repo *Repository) GetMirror() (err error) {
	repo.Mirror, err = GetMirrorByRepoID(repo.ID)
	return err
}

// GetBaseRepo populates repo.BaseRepo for a fork repository and
// returns an error on failure (NOTE: no error is returned for
// non-fork repositories, and BaseRepo will be left untouched)
func (repo *Repository) GetBaseRepo() (err error) {
	return repo.getBaseRepo(x)
}

func (repo *Repository) getBaseRepo(e Engine) (err error) {
	if !repo.IsFork {
		return nil
	}

	repo.BaseRepo, err = getRepositoryByID(e, repo.ForkID)
	return err
}

// IsGenerated returns whether _this_ repository was generated from a template
func (repo *Repository) IsGenerated() bool {
	return repo.TemplateID != 0
}

// GetTemplateRepo populates repo.TemplateRepo for a generated repository and
// returns an error on failure (NOTE: no error is returned for
// non-generated repositories, and TemplateRepo will be left untouched)
func (repo *Repository) GetTemplateRepo() (err error) {
	return repo.getTemplateRepo(x)
}

func (repo *Repository) getTemplateRepo(e Engine) (err error) {
	if !repo.IsGenerated() {
		return nil
	}

	repo.TemplateRepo, err = getRepositoryByID(e, repo.TemplateID)
	return err
}

// RepoPath returns the repository path
func (repo *Repository) RepoPath() string {
	return RepoPath(repo.OwnerName, repo.Name)
}

// GitConfigPath returns the path to a repository's git config/ directory
func GitConfigPath(repoPath string) string {
	return filepath.Join(repoPath, "config")
}

// GitConfigPath returns the repository git config path
func (repo *Repository) GitConfigPath() string {
	return GitConfigPath(repo.RepoPath())
}

// RelLink returns the repository relative link
func (repo *Repository) RelLink() string {
	return "/" + repo.FullName()
}

// Link returns the repository link
func (repo *Repository) Link() string {
	return setting.AppSubURL + "/" + repo.FullName()
}

// ComposeCompareURL returns the repository comparison URL
func (repo *Repository) ComposeCompareURL(oldCommitID, newCommitID string) string {
	return fmt.Sprintf("%s/compare/%s...%s", repo.FullName(), oldCommitID, newCommitID)
}

// UpdateDefaultBranch updates the default branch
func (repo *Repository) UpdateDefaultBranch() error {
	_, err := x.ID(repo.ID).Cols("default_branch").Update(repo)
	return err
}

// IsOwnedBy returns true when user owns this repository
func (repo *Repository) IsOwnedBy(userID int64) bool {
	return repo.OwnerID == userID
}

func (repo *Repository) updateSize(e Engine) error {
	size, err := util.GetDirectorySize(repo.RepoPath())
	if err != nil {
		return fmt.Errorf("updateSize: %v", err)
	}

	objs, err := repo.GetLFSMetaObjects(-1, 0)
	if err != nil {
		return fmt.Errorf("updateSize: GetLFSMetaObjects: %v", err)
	}
	for _, obj := range objs {
		size += obj.Size
	}

	repo.Size = size
	_, err = e.ID(repo.ID).Cols("size").Update(repo)
	return err
}

// UpdateSize updates the repository size, calculating it using util.GetDirectorySize
func (repo *Repository) UpdateSize(ctx DBContext) error {
	return repo.updateSize(ctx.e)
}

// CanUserFork returns true if specified user can fork repository.
func (repo *Repository) CanUserFork(user *User) (bool, error) {
	if user == nil {
		return false, nil
	}
	if repo.OwnerID != user.ID && !user.HasForkedRepo(repo.ID) {
		return true, nil
	}
	if err := user.GetOwnedOrganizations(); err != nil {
		return false, err
	}
	for _, org := range user.OwnedOrgs {
		if repo.OwnerID != org.ID && !org.HasForkedRepo(repo.ID) {
			return true, nil
		}
	}
	return false, nil
}

// CanUserDelete returns true if user could delete the repository
func (repo *Repository) CanUserDelete(user *User) (bool, error) {
	if user.IsAdmin || user.ID == repo.OwnerID {
		return true, nil
	}

	if err := repo.GetOwner(); err != nil {
		return false, err
	}

	if repo.Owner.IsOrganization() {
		isOwner, err := repo.Owner.IsOwnedBy(user.ID)
		if err != nil {
			return false, err
		} else if isOwner {
			return true, nil
		}
	}

	return false, nil
}

// CanEnablePulls returns true if repository meets the requirements of accepting pulls.
func (repo *Repository) CanEnablePulls() bool {
	return !repo.IsMirror && !repo.IsEmpty
}

// AllowsPulls returns true if repository meets the requirements of accepting pulls and has them enabled.
func (repo *Repository) AllowsPulls() bool {
	return repo.CanEnablePulls() && repo.UnitEnabled(UnitTypePullRequests)
}

// CanEnableEditor returns true if repository meets the requirements of web editor.
func (repo *Repository) CanEnableEditor() bool {
	return !repo.IsMirror
}

// GetReaders returns all users that have explicit read access or higher to the repository.
func (repo *Repository) GetReaders() (_ []*User, err error) {
	return repo.getUsersWithAccessMode(x, AccessModeRead)
}

// GetWriters returns all users that have write access to the repository.
func (repo *Repository) GetWriters() (_ []*User, err error) {
	return repo.getUsersWithAccessMode(x, AccessModeWrite)
}

// IsReader returns true if user has explicit read access or higher to the repository.
func (repo *Repository) IsReader(userID int64) (bool, error) {
	if repo.OwnerID == userID {
		return true, nil
	}
	return x.Where("repo_id = ? AND user_id = ? AND mode >= ?", repo.ID, userID, AccessModeRead).Get(&Access{})
}

// getUsersWithAccessMode returns users that have at least given access mode to the repository.
func (repo *Repository) getUsersWithAccessMode(e Engine, mode AccessMode) (_ []*User, err error) {
	if err = repo.getOwner(e); err != nil {
		return nil, err
	}

	accesses := make([]*Access, 0, 10)
	if err = e.Where("repo_id = ? AND mode >= ?", repo.ID, mode).Find(&accesses); err != nil {
		return nil, err
	}

	// Leave a seat for owner itself to append later, but if owner is an organization
	// and just waste 1 unit is cheaper than re-allocate memory once.
	users := make([]*User, 0, len(accesses)+1)
	if len(accesses) > 0 {
		userIDs := make([]int64, len(accesses))
		for i := 0; i < len(accesses); i++ {
			userIDs[i] = accesses[i].UserID
		}

		if err = e.In("id", userIDs).Find(&users); err != nil {
			return nil, err
		}
	}
	if !repo.Owner.IsOrganization() {
		users = append(users, repo.Owner)
	}

	return users, nil
}

// DescriptionHTML does special handles to description and return HTML string.
func (repo *Repository) DescriptionHTML() template.HTML {
	desc, err := markup.RenderDescriptionHTML([]byte(repo.Description), repo.HTMLURL(), repo.ComposeMetas())
	if err != nil {
		log.Error("Failed to render description for %s (ID: %d): %v", repo.Name, repo.ID, err)
		return template.HTML(markup.Sanitize(repo.Description))
	}
	return template.HTML(markup.Sanitize(string(desc)))
}

func isRepositoryExist(e Engine, u *User, repoName string) (bool, error) {
	has, err := e.Get(&Repository{
		OwnerID:   u.ID,
		LowerName: strings.ToLower(repoName),
	})
	if err != nil {
		return false, err
	}
	isDir, err := util.IsDir(RepoPath(u.Name, repoName))
	return has && isDir, err
}

// IsRepositoryExist returns true if the repository with given name under user has already existed.
func IsRepositoryExist(u *User, repoName string) (bool, error) {
	return isRepositoryExist(x, u, repoName)
}

// CloneLink represents different types of clone URLs of repository.
type CloneLink struct {
	SSH   string
	HTTPS string
	Git   string
}

// ComposeHTTPSCloneURL returns HTTPS clone URL based on given owner and repository name.
func ComposeHTTPSCloneURL(owner, repo string) string {
	return fmt.Sprintf("%s%s/%s.git", setting.AppURL, url.PathEscape(owner), url.PathEscape(repo))
}

func (repo *Repository) cloneLink(isWiki bool) *CloneLink {
	repoName := repo.Name
	if isWiki {
		repoName += ".wiki"
	}

	sshUser := setting.RunUser
	if setting.SSH.StartBuiltinServer {
		sshUser = setting.SSH.BuiltinServerUser
	}

	cl := new(CloneLink)

	// if we have a ipv6 literal we need to put brackets around it
	// for the git cloning to work.
	sshDomain := setting.SSH.Domain
	ip := net.ParseIP(setting.SSH.Domain)
	if ip != nil && ip.To4() == nil {
		sshDomain = "[" + setting.SSH.Domain + "]"
	}

	if setting.SSH.Port != 22 {
		cl.SSH = fmt.Sprintf("ssh://%s@%s/%s/%s.git", sshUser, net.JoinHostPort(setting.SSH.Domain, strconv.Itoa(setting.SSH.Port)), repo.OwnerName, repoName)
	} else if setting.Repository.UseCompatSSHURI {
		cl.SSH = fmt.Sprintf("ssh://%s@%s/%s/%s.git", sshUser, sshDomain, repo.OwnerName, repoName)
	} else {
		cl.SSH = fmt.Sprintf("%s@%s:%s/%s.git", sshUser, sshDomain, repo.OwnerName, repoName)
	}
	cl.HTTPS = ComposeHTTPSCloneURL(repo.OwnerName, repoName)
	return cl
}

// CloneLink returns clone URLs of repository.
func (repo *Repository) CloneLink() (cl *CloneLink) {
	return repo.cloneLink(false)
}

// CheckCreateRepository check if could created a repository
func CheckCreateRepository(doer, u *User, name string, overwriteOrAdopt bool) error {
	if !doer.CanCreateRepo() {
		return ErrReachLimitOfRepo{u.MaxRepoCreation}
	}

	if err := IsUsableRepoName(name); err != nil {
		return err
	}

	has, err := isRepositoryExist(x, u, name)
	if err != nil {
		return fmt.Errorf("IsRepositoryExist: %v", err)
	} else if has {
		return ErrRepoAlreadyExist{u.Name, name}
	}

	isExist, err := util.IsExist(RepoPath(u.Name, name))
	if err != nil {
		log.Error("Unable to check if %s exists. Error: %v", RepoPath(u.Name, name), err)
		return err
	}
	if !overwriteOrAdopt && isExist {
		return ErrRepoFilesAlreadyExist{u.Name, name}
	}
	return nil
}

// CreateRepoOptions contains the create repository options
type CreateRepoOptions struct {
	Name           string
	Description    string
	OriginalURL    string
	GitServiceType api.GitServiceType
	Gitignores     string
	IssueLabels    string
	License        string
	Readme         string
	DefaultBranch  string
	IsPrivate      bool
	IsMirror       bool
	IsTemplate     bool
	AutoInit       bool
	Status         RepositoryStatus
	TrustModel     TrustModelType
	MirrorInterval string
}

// GetRepoInitFile returns repository init files
func GetRepoInitFile(tp, name string) ([]byte, error) {
	cleanedName := strings.TrimLeft(path.Clean("/"+name), "/")
	relPath := path.Join("options", tp, cleanedName)

	// Use custom file when available.
	customPath := path.Join(setting.CustomPath, relPath)
	isFile, err := util.IsFile(customPath)
	if err != nil {
		log.Error("Unable to check if %s is a file. Error: %v", customPath, err)
	}
	if isFile {
		return ioutil.ReadFile(customPath)
	}

	switch tp {
	case "readme":
		return options.Readme(cleanedName)
	case "gitignore":
		return options.Gitignore(cleanedName)
	case "license":
		return options.License(cleanedName)
	case "label":
		return options.Labels(cleanedName)
	default:
		return []byte{}, fmt.Errorf("Invalid init file type")
	}
}

var (
	reservedRepoNames    = []string{".", ".."}
	reservedRepoPatterns = []string{"*.git", "*.wiki"}
)

// IsUsableRepoName returns true when repository is usable
func IsUsableRepoName(name string) error {
	if alphaDashDotPattern.MatchString(name) {
		// Note: usually this error is normally caught up earlier in the UI
		return ErrNameCharsNotAllowed{Name: name}
	}
	return isUsableName(reservedRepoNames, reservedRepoPatterns, name)
}

// CreateRepository creates a repository for the user/organization.
func CreateRepository(ctx DBContext, doer, u *User, repo *Repository, overwriteOrAdopt bool) (err error) {
	if err = IsUsableRepoName(repo.Name); err != nil {
		return err
	}

	has, err := isRepositoryExist(ctx.e, u, repo.Name)
	if err != nil {
		return fmt.Errorf("IsRepositoryExist: %v", err)
	} else if has {
		return ErrRepoAlreadyExist{u.Name, repo.Name}
	}

	repoPath := RepoPath(u.Name, repo.Name)
	isExist, err := util.IsExist(repoPath)
	if err != nil {
		log.Error("Unable to check if %s exists. Error: %v", repoPath, err)
		return err
	}
	if !overwriteOrAdopt && isExist {
		log.Error("Files already exist in %s and we are not going to adopt or delete.", repoPath)
		return ErrRepoFilesAlreadyExist{
			Uname: u.Name,
			Name:  repo.Name,
		}
	}

	if _, err = ctx.e.Insert(repo); err != nil {
		return err
	}
	if err = deleteRepoRedirect(ctx.e, u.ID, repo.Name); err != nil {
		return err
	}

	// insert units for repo
	var units = make([]RepoUnit, 0, len(DefaultRepoUnits))
	for _, tp := range DefaultRepoUnits {
		if tp == UnitTypeIssues {
			units = append(units, RepoUnit{
				RepoID: repo.ID,
				Type:   tp,
				Config: &IssuesConfig{
					EnableTimetracker:                setting.Service.DefaultEnableTimetracking,
					AllowOnlyContributorsToTrackTime: setting.Service.DefaultAllowOnlyContributorsToTrackTime,
					EnableDependencies:               setting.Service.DefaultEnableDependencies,
				},
			})
		} else if tp == UnitTypePullRequests {
			units = append(units, RepoUnit{
				RepoID: repo.ID,
				Type:   tp,
				Config: &PullRequestsConfig{AllowMerge: true, AllowRebase: true, AllowRebaseMerge: true, AllowSquash: true},
			})
		} else {
			units = append(units, RepoUnit{
				RepoID: repo.ID,
				Type:   tp,
			})
		}
	}

	if _, err = ctx.e.Insert(&units); err != nil {
		return err
	}

	// Remember visibility preference.
	u.LastRepoVisibility = repo.IsPrivate
	if err = updateUserCols(ctx.e, u, "last_repo_visibility"); err != nil {
		return fmt.Errorf("updateUser: %v", err)
	}

	if _, err = ctx.e.Incr("num_repos").ID(u.ID).Update(new(User)); err != nil {
		return fmt.Errorf("increment user total_repos: %v", err)
	}
	u.NumRepos++

	// Give access to all members in teams with access to all repositories.
	if u.IsOrganization() {
		if err := u.GetTeams(&SearchTeamOptions{}); err != nil {
			return fmt.Errorf("GetTeams: %v", err)
		}
		for _, t := range u.Teams {
			if t.IncludesAllRepositories {
				if err := t.addRepository(ctx.e, repo); err != nil {
					return fmt.Errorf("addRepository: %v", err)
				}
			}
		}

		if isAdmin, err := isUserRepoAdmin(ctx.e, repo, doer); err != nil {
			return fmt.Errorf("isUserRepoAdmin: %v", err)
		} else if !isAdmin {
			// Make creator repo admin if it wan't assigned automatically
			if err = repo.addCollaborator(ctx.e, doer); err != nil {
				return fmt.Errorf("AddCollaborator: %v", err)
			}
			if err = repo.changeCollaborationAccessMode(ctx.e, doer.ID, AccessModeAdmin); err != nil {
				return fmt.Errorf("ChangeCollaborationAccessMode: %v", err)
			}
		}
	} else if err = repo.recalculateAccesses(ctx.e); err != nil {
		// Organization automatically called this in addRepository method.
		return fmt.Errorf("recalculateAccesses: %v", err)
	}

	if setting.Service.AutoWatchNewRepos {
		if err = watchRepo(ctx.e, doer.ID, repo.ID, true); err != nil {
			return fmt.Errorf("watchRepo: %v", err)
		}
	}

	if err = copyDefaultWebhooksToRepo(ctx.e, repo.ID); err != nil {
		return fmt.Errorf("copyDefaultWebhooksToRepo: %v", err)
	}

	return nil
}

func countRepositories(userID int64, private bool) int64 {
	sess := x.Where("id > 0")

	if userID > 0 {
		sess.And("owner_id = ?", userID)
	}
	if !private {
		sess.And("is_private=?", false)
	}

	count, err := sess.Count(new(Repository))
	if err != nil {
		log.Error("countRepositories: %v", err)
	}
	return count
}

// CountRepositories returns number of repositories.
// Argument private only takes effect when it is false,
// set it true to count all repositories.
func CountRepositories(private bool) int64 {
	return countRepositories(-1, private)
}

// CountUserRepositories returns number of repositories user owns.
// Argument private only takes effect when it is false,
// set it true to count all repositories.
func CountUserRepositories(userID int64, private bool) int64 {
	return countRepositories(userID, private)
}

// RepoPath returns repository path by given user and repository name.
func RepoPath(userName, repoName string) string {
	return filepath.Join(UserPath(userName), strings.ToLower(repoName)+".git")
}

// IncrementRepoForkNum increment repository fork number
func IncrementRepoForkNum(ctx DBContext, repoID int64) error {
	_, err := ctx.e.Exec("UPDATE `repository` SET num_forks=num_forks+1 WHERE id=?", repoID)
	return err
}

// TransferOwnership transfers all corresponding setting from old user to new one.
func TransferOwnership(doer *User, newOwnerName string, repo *Repository) error {
	newOwner, err := GetUserByName(newOwnerName)
	if err != nil {
		return fmt.Errorf("get new owner '%s': %v", newOwnerName, err)
	}

	// Check if new owner has repository with same name.
	has, err := IsRepositoryExist(newOwner, repo.Name)
	if err != nil {
		return fmt.Errorf("IsRepositoryExist: %v", err)
	} else if has {
		return ErrRepoAlreadyExist{newOwnerName, repo.Name}
	}

	sess := x.NewSession()
	defer sess.Close()
	if err = sess.Begin(); err != nil {
		return fmt.Errorf("sess.Begin: %v", err)
	}

	oldOwner := repo.Owner

	// Note: we have to set value here to make sure recalculate accesses is based on
	// new owner.
	repo.OwnerID = newOwner.ID
	repo.Owner = newOwner
	repo.OwnerName = newOwner.Name

	// Update repository.
	if _, err := sess.ID(repo.ID).Update(repo); err != nil {
		return fmt.Errorf("update owner: %v", err)
	}

	// Remove redundant collaborators.
	collaborators, err := repo.getCollaborators(sess, ListOptions{})
	if err != nil {
		return fmt.Errorf("getCollaborators: %v", err)
	}

	// Dummy object.
	collaboration := &Collaboration{RepoID: repo.ID}
	for _, c := range collaborators {
		if c.ID != newOwner.ID {
			isMember, err := isOrganizationMember(sess, newOwner.ID, c.ID)
			if err != nil {
				return fmt.Errorf("IsOrgMember: %v", err)
			} else if !isMember {
				continue
			}
		}
		collaboration.UserID = c.ID
		if _, err = sess.Delete(collaboration); err != nil {
			return fmt.Errorf("remove collaborator '%d': %v", c.ID, err)
		}
	}

	// Remove old team-repository relations.
	if oldOwner.IsOrganization() {
		if err = oldOwner.removeOrgRepo(sess, repo.ID); err != nil {
			return fmt.Errorf("removeOrgRepo: %v", err)
		}
	}

	if newOwner.IsOrganization() {
		if err := newOwner.getTeams(sess); err != nil {
			return fmt.Errorf("GetTeams: %v", err)
		}
		for _, t := range newOwner.Teams {
			if t.IncludesAllRepositories {
				if err := t.addRepository(sess, repo); err != nil {
					return fmt.Errorf("addRepository: %v", err)
				}
			}
		}
	} else if err = repo.recalculateAccesses(sess); err != nil {
		// Organization called this in addRepository method.
		return fmt.Errorf("recalculateAccesses: %v", err)
	}

	// Update repository count.
	if _, err = sess.Exec("UPDATE `user` SET num_repos=num_repos+1 WHERE id=?", newOwner.ID); err != nil {
		return fmt.Errorf("increase new owner repository count: %v", err)
	} else if _, err = sess.Exec("UPDATE `user` SET num_repos=num_repos-1 WHERE id=?", oldOwner.ID); err != nil {
		return fmt.Errorf("decrease old owner repository count: %v", err)
	}

	if err = watchRepo(sess, doer.ID, repo.ID, true); err != nil {
		return fmt.Errorf("watchRepo: %v", err)
	}

	// Remove watch for organization.
	if oldOwner.IsOrganization() {
		if err = watchRepo(sess, oldOwner.ID, repo.ID, false); err != nil {
			return fmt.Errorf("watchRepo [false]: %v", err)
		}
	}

	// Rename remote repository to new path and delete local copy.
	dir := UserPath(newOwner.Name)

	if err := os.MkdirAll(dir, os.ModePerm); err != nil {
		return fmt.Errorf("Failed to create dir %s: %v", dir, err)
	}

	if err = os.Rename(RepoPath(oldOwner.Name, repo.Name), RepoPath(newOwner.Name, repo.Name)); err != nil {
		return fmt.Errorf("rename repository directory: %v", err)
	}

	// Rename remote wiki repository to new path and delete local copy.
	wikiPath := WikiPath(oldOwner.Name, repo.Name)
	isExist, err := util.IsExist(wikiPath)
	if err != nil {
		log.Error("Unable to check if %s exists. Error: %v", wikiPath, err)
		return err
	}
	if isExist {
		if err = os.Rename(wikiPath, WikiPath(newOwner.Name, repo.Name)); err != nil {
			return fmt.Errorf("rename repository wiki: %v", err)
		}
	}

	// If there was previously a redirect at this location, remove it.
	if err = deleteRepoRedirect(sess, newOwner.ID, repo.Name); err != nil {
		return fmt.Errorf("delete repo redirect: %v", err)
	}

	if err := newRepoRedirect(sess, oldOwner.ID, repo.ID, repo.Name, repo.Name); err != nil {
		return fmt.Errorf("newRepoRedirect: %v", err)
	}

	return sess.Commit()
}

// ChangeRepositoryName changes all corresponding setting from old repository name to new one.
func ChangeRepositoryName(doer *User, repo *Repository, newRepoName string) (err error) {
	oldRepoName := repo.Name
	newRepoName = strings.ToLower(newRepoName)
	if err = IsUsableRepoName(newRepoName); err != nil {
		return err
	}

	if err := repo.GetOwner(); err != nil {
		return err
	}

	has, err := IsRepositoryExist(repo.Owner, newRepoName)
	if err != nil {
		return fmt.Errorf("IsRepositoryExist: %v", err)
	} else if has {
		return ErrRepoAlreadyExist{repo.Owner.Name, newRepoName}
	}

	newRepoPath := RepoPath(repo.Owner.Name, newRepoName)
	if err = os.Rename(repo.RepoPath(), newRepoPath); err != nil {
		return fmt.Errorf("rename repository directory: %v", err)
	}

	wikiPath := repo.WikiPath()
	isExist, err := util.IsExist(wikiPath)
	if err != nil {
		log.Error("Unable to check if %s exists. Error: %v", wikiPath, err)
		return err
	}
	if isExist {
		if err = os.Rename(wikiPath, WikiPath(repo.Owner.Name, newRepoName)); err != nil {
			return fmt.Errorf("rename repository wiki: %v", err)
		}
	}

	sess := x.NewSession()
	defer sess.Close()
	if err = sess.Begin(); err != nil {
		return fmt.Errorf("sess.Begin: %v", err)
	}

	if err := newRepoRedirect(sess, repo.Owner.ID, repo.ID, oldRepoName, newRepoName); err != nil {
		return err
	}

	return sess.Commit()
}

func getRepositoriesByForkID(e Engine, forkID int64) ([]*Repository, error) {
	repos := make([]*Repository, 0, 10)
	return repos, e.
		Where("fork_id=?", forkID).
		Find(&repos)
}

// GetRepositoriesByForkID returns all repositories with given fork ID.
func GetRepositoriesByForkID(forkID int64) ([]*Repository, error) {
	return getRepositoriesByForkID(x, forkID)
}

func updateRepository(e Engine, repo *Repository, visibilityChanged bool) (err error) {
	repo.LowerName = strings.ToLower(repo.Name)

	if utf8.RuneCountInString(repo.Description) > 255 {
		repo.Description = string([]rune(repo.Description)[:255])
	}
	if utf8.RuneCountInString(repo.Website) > 255 {
		repo.Website = string([]rune(repo.Website)[:255])
	}

	if _, err = e.ID(repo.ID).AllCols().Update(repo); err != nil {
		return fmt.Errorf("update: %v", err)
	}

	if err = repo.updateSize(e); err != nil {
		log.Error("Failed to update size for repository: %v", err)
	}

	if visibilityChanged {
		if err = repo.getOwner(e); err != nil {
			return fmt.Errorf("getOwner: %v", err)
		}
		if repo.Owner.IsOrganization() {
			// Organization repository need to recalculate access table when visibility is changed.
			if err = repo.recalculateTeamAccesses(e, 0); err != nil {
				return fmt.Errorf("recalculateTeamAccesses: %v", err)
			}
		}

		// If repo has become private, we need to set its actions to private.
		if repo.IsPrivate {
			_, err = e.Where("repo_id = ?", repo.ID).Cols("is_private").Update(&Action{
				IsPrivate: true,
			})
			if err != nil {
				return err
			}
		}

		// Create/Remove git-daemon-export-ok for git-daemon...
		daemonExportFile := path.Join(repo.RepoPath(), `git-daemon-export-ok`)
		isExist, err := util.IsExist(daemonExportFile)
		if err != nil {
			log.Error("Unable to check if %s exists. Error: %v", daemonExportFile, err)
			return err
		}
		if repo.IsPrivate && isExist {
			if err = util.Remove(daemonExportFile); err != nil {
				log.Error("Failed to remove %s: %v", daemonExportFile, err)
			}
		} else if !repo.IsPrivate && !isExist {
			if f, err := os.Create(daemonExportFile); err != nil {
				log.Error("Failed to create %s: %v", daemonExportFile, err)
			} else {
				f.Close()
			}
		}

		forkRepos, err := getRepositoriesByForkID(e, repo.ID)
		if err != nil {
			return fmt.Errorf("getRepositoriesByForkID: %v", err)
		}
		for i := range forkRepos {
			forkRepos[i].IsPrivate = repo.IsPrivate || repo.Owner.Visibility == api.VisibleTypePrivate
			if err = updateRepository(e, forkRepos[i], true); err != nil {
				return fmt.Errorf("updateRepository[%d]: %v", forkRepos[i].ID, err)
			}
		}
	}

	return nil
}

// UpdateRepositoryCtx updates a repository with db context
func UpdateRepositoryCtx(ctx DBContext, repo *Repository, visibilityChanged bool) error {
	return updateRepository(ctx.e, repo, visibilityChanged)
}

// UpdateRepository updates a repository
func UpdateRepository(repo *Repository, visibilityChanged bool) (err error) {
	sess := x.NewSession()
	defer sess.Close()
	if err = sess.Begin(); err != nil {
		return err
	}

	if err = updateRepository(sess, repo, visibilityChanged); err != nil {
		return fmt.Errorf("updateRepository: %v", err)
	}

	return sess.Commit()
}

// UpdateRepositoryUpdatedTime updates a repository's updated time
func UpdateRepositoryUpdatedTime(repoID int64, updateTime time.Time) error {
	_, err := x.Exec("UPDATE repository SET updated_unix = ? WHERE id = ?", updateTime.Unix(), repoID)
	return err
}

// UpdateRepositoryUnits updates a repository's units
func UpdateRepositoryUnits(repo *Repository, units []RepoUnit, deleteUnitTypes []UnitType) (err error) {
	sess := x.NewSession()
	defer sess.Close()
	if err = sess.Begin(); err != nil {
		return err
	}

	// Delete existing settings of units before adding again
	for _, u := range units {
		deleteUnitTypes = append(deleteUnitTypes, u.Type)
	}

	if _, err = sess.Where("repo_id = ?", repo.ID).In("type", deleteUnitTypes).Delete(new(RepoUnit)); err != nil {
		return err
	}

	if len(units) > 0 {
		if _, err = sess.Insert(units); err != nil {
			return err
		}
	}

	return sess.Commit()
}

// DeleteRepository deletes a repository for a user or organization.
// make sure if you call this func to close open sessions (sqlite will otherwise get a deadlock)
func DeleteRepository(doer *User, uid, repoID int64) error {
	sess := x.NewSession()
	defer sess.Close()
	if err := sess.Begin(); err != nil {
		return err
	}

	// In case is a organization.
	org, err := getUserByID(sess, uid)
	if err != nil {
		return err
	}
	if org.IsOrganization() {
		if err = org.getTeams(sess); err != nil {
			return err
		}
	}

	repo := &Repository{OwnerID: uid}
	has, err := sess.ID(repoID).Get(repo)
	if err != nil {
		return err
	} else if !has {
		return ErrRepoNotExist{repoID, uid, "", ""}
	}

	// Delete Deploy Keys
	deployKeys, err := listDeployKeys(sess, repo.ID, ListOptions{})
	if err != nil {
		return fmt.Errorf("listDeployKeys: %v", err)
	}
	for _, dKey := range deployKeys {
		if err := deleteDeployKey(sess, doer, dKey.ID); err != nil {
			return fmt.Errorf("deleteDeployKeys: %v", err)
		}
	}

	if cnt, err := sess.ID(repoID).Delete(&Repository{}); err != nil {
		return err
	} else if cnt != 1 {
		return ErrRepoNotExist{repoID, uid, "", ""}
	}

	if org.IsOrganization() {
		for _, t := range org.Teams {
			if !t.hasRepository(sess, repoID) {
				continue
			} else if err = t.removeRepository(sess, repo, false); err != nil {
				return err
			}
		}
	}

	attachments := make([]*Attachment, 0, 20)
	if err = sess.Join("INNER", "`release`", "`release`.id = `attachment`.release_id").
		Where("`release`.repo_id = ?", repoID).
		Find(&attachments); err != nil {
		return err
	}
	releaseAttachments := make([]string, 0, len(attachments))
	for i := 0; i < len(attachments); i++ {
		releaseAttachments = append(releaseAttachments, attachments[i].RelativePath())
	}

	if _, err = sess.Exec("UPDATE `user` SET num_stars=num_stars-1 WHERE id IN (SELECT `uid` FROM `star` WHERE repo_id = ?)", repo.ID); err != nil {
		return err
	}

	if err = deleteBeans(sess,
		&Access{RepoID: repo.ID},
		&Action{RepoID: repo.ID},
		&Watch{RepoID: repoID},
		&Star{RepoID: repoID},
		&Mirror{RepoID: repoID},
		&Milestone{RepoID: repoID},
		&Release{RepoID: repoID},
		&Collaboration{RepoID: repoID},
		&PullRequest{BaseRepoID: repoID},
		&RepoUnit{RepoID: repoID},
		&RepoRedirect{RedirectRepoID: repoID},
		&Webhook{RepoID: repoID},
		&HookTask{RepoID: repoID},
		&Notification{RepoID: repoID},
		&CommitStatus{RepoID: repoID},
		&RepoIndexerStatus{RepoID: repoID},
		&LanguageStat{RepoID: repoID},
		&Comment{RefRepoID: repoID},
		&Task{RepoID: repoID},
	); err != nil {
		return fmt.Errorf("deleteBeans: %v", err)
	}

	// Delete Issues and related objects
	var attachmentPaths []string
	if attachmentPaths, err = deleteIssuesByRepoID(sess, repoID); err != nil {
		return err
	}

	if _, err = sess.Where("repo_id = ?", repoID).Delete(new(RepoUnit)); err != nil {
		return err
	}

	if repo.IsFork {
		if _, err = sess.Exec("UPDATE `repository` SET num_forks=num_forks-1 WHERE id=?", repo.ForkID); err != nil {
			return fmt.Errorf("decrease fork count: %v", err)
		}
	}

	if _, err = sess.Exec("UPDATE `user` SET num_repos=num_repos-1 WHERE id=?", uid); err != nil {
		return err
	}

	if len(repo.Topics) > 0 {
		if err = removeTopicsFromRepo(sess, repo.ID); err != nil {
			return err
		}
	}

	projects, _, err := getProjects(sess, ProjectSearchOptions{
		RepoID: repoID,
	})
	if err != nil {
		return fmt.Errorf("get projects: %v", err)
	}
	for i := range projects {
		if err := deleteProjectByID(sess, projects[i].ID); err != nil {
			return fmt.Errorf("delete project [%d]: %v", projects[i].ID, err)
		}
	}

	// FIXME: Remove repository files should be executed after transaction succeed.
	repoPath := repo.RepoPath()
	removeAllWithNotice(sess, "Delete repository files", repoPath)

	err = repo.deleteWiki(sess)
	if err != nil {
		return err
	}

	// Remove LFS objects
	var lfsObjects []*LFSMetaObject
	if err = sess.Where("repository_id=?", repoID).Find(&lfsObjects); err != nil {
		return err
	}

	for _, v := range lfsObjects {
		count, err := sess.Count(&LFSMetaObject{Oid: v.Oid})
		if err != nil {
			return err
		}
		if count > 1 {
			continue
		}

		removeStorageWithNotice(sess, storage.LFS, "Delete orphaned LFS file", v.RelativePath())
	}

	if _, err := sess.Delete(&LFSMetaObject{RepositoryID: repoID}); err != nil {
		return err
	}

	if repo.NumForks > 0 {
		if _, err = sess.Exec("UPDATE `repository` SET fork_id=0,is_fork=? WHERE fork_id=?", false, repo.ID); err != nil {
			log.Error("reset 'fork_id' and 'is_fork': %v", err)
		}
	}

	if err = sess.Commit(); err != nil {
		return err
	}

	sess.Close()

	// We should always delete the files after the database transaction succeed. If
	// we delete the file but the database rollback, the repository will be borken.

	// Remove issue attachment files.
	for i := range attachmentPaths {
		RemoveStorageWithNotice(storage.Attachments, "Delete issue attachment", attachmentPaths[i])
	}

	// Remove release attachment files.
	for i := range releaseAttachments {
		RemoveStorageWithNotice(storage.Attachments, "Delete release attachment", releaseAttachments[i])
	}

	if len(repo.Avatar) > 0 {
		if err := storage.RepoAvatars.Delete(repo.CustomAvatarRelativePath()); err != nil {
			return fmt.Errorf("Failed to remove %s: %v", repo.Avatar, err)
		}
	}

	return nil
}

// GetRepositoryByOwnerAndName returns the repository by given ownername and reponame.
func GetRepositoryByOwnerAndName(ownerName, repoName string) (*Repository, error) {
	return getRepositoryByOwnerAndName(x, ownerName, repoName)
}

func getRepositoryByOwnerAndName(e Engine, ownerName, repoName string) (*Repository, error) {
	var repo Repository
	has, err := e.Table("repository").Select("repository.*").
		Join("INNER", "`user`", "`user`.id = repository.owner_id").
		Where("repository.lower_name = ?", strings.ToLower(repoName)).
		And("`user`.lower_name = ?", strings.ToLower(ownerName)).
		Get(&repo)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrRepoNotExist{0, 0, ownerName, repoName}
	}
	return &repo, nil
}

// GetRepositoryByName returns the repository by given name under user if exists.
func GetRepositoryByName(ownerID int64, name string) (*Repository, error) {
	repo := &Repository{
		OwnerID:   ownerID,
		LowerName: strings.ToLower(name),
	}
	has, err := x.Get(repo)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrRepoNotExist{0, ownerID, "", name}
	}
	return repo, err
}

func getRepositoryByID(e Engine, id int64) (*Repository, error) {
	repo := new(Repository)
	has, err := e.ID(id).Get(repo)
	if err != nil {
		return nil, err
	} else if !has {
		return nil, ErrRepoNotExist{id, 0, "", ""}
	}
	return repo, nil
}

// GetRepositoryByID returns the repository by given id if exists.
func GetRepositoryByID(id int64) (*Repository, error) {
	return getRepositoryByID(x, id)
}

// GetRepositoryByIDCtx returns the repository by given id if exists.
func GetRepositoryByIDCtx(ctx DBContext, id int64) (*Repository, error) {
	return getRepositoryByID(ctx.e, id)
}

// GetRepositoriesMapByIDs returns the repositories by given id slice.
func GetRepositoriesMapByIDs(ids []int64) (map[int64]*Repository, error) {
	var repos = make(map[int64]*Repository, len(ids))
	return repos, x.In("id", ids).Find(&repos)
}

// GetUserRepositories returns a list of repositories of given user.
func GetUserRepositories(opts *SearchRepoOptions) ([]*Repository, int64, error) {
	if len(opts.OrderBy) == 0 {
		opts.OrderBy = "updated_unix DESC"
	}

	var cond = builder.NewCond()
	cond = cond.And(builder.Eq{"owner_id": opts.Actor.ID})
	if !opts.Private {
		cond = cond.And(builder.Eq{"is_private": false})
	}

	if opts.LowerNames != nil && len(opts.LowerNames) > 0 {
		cond = cond.And(builder.In("lower_name", opts.LowerNames))
	}

	sess := x.NewSession()
	defer sess.Close()

	count, err := sess.Where(cond).Count(new(Repository))
	if err != nil {
		return nil, 0, fmt.Errorf("Count: %v", err)
	}

	sess.Where(cond).OrderBy(opts.OrderBy.String())
	repos := make([]*Repository, 0, opts.PageSize)
	return repos, count, opts.setSessionPagination(sess).Find(&repos)
}

// GetUserMirrorRepositories returns a list of mirror repositories of given user.
func GetUserMirrorRepositories(userID int64) ([]*Repository, error) {
	repos := make([]*Repository, 0, 10)
	return repos, x.
		Where("owner_id = ?", userID).
		And("is_mirror = ?", true).
		Find(&repos)
}

func getRepositoryCount(e Engine, u *User) (int64, error) {
	return e.Count(&Repository{OwnerID: u.ID})
}

func getPublicRepositoryCount(e Engine, u *User) (int64, error) {
	return e.Where("is_private = ?", false).Count(&Repository{OwnerID: u.ID})
}

func getPrivateRepositoryCount(e Engine, u *User) (int64, error) {
	return e.Where("is_private = ?", true).Count(&Repository{OwnerID: u.ID})
}

// GetRepositoryCount returns the total number of repositories of user.
func GetRepositoryCount(u *User) (int64, error) {
	return getRepositoryCount(x, u)
}

// GetPublicRepositoryCount returns the total number of public repositories of user.
func GetPublicRepositoryCount(u *User) (int64, error) {
	return getPublicRepositoryCount(x, u)
}

// GetPrivateRepositoryCount returns the total number of private repositories of user.
func GetPrivateRepositoryCount(u *User) (int64, error) {
	return getPrivateRepositoryCount(x, u)
}

// DeleteRepositoryArchives deletes all repositories' archives.
func DeleteRepositoryArchives(ctx context.Context) error {
	return x.
		Where("id > 0").
		Iterate(new(Repository),
			func(idx int, bean interface{}) error {
				repo := bean.(*Repository)
				select {
				case <-ctx.Done():
					return ErrCancelledf("before deleting repository archives for %s", repo.FullName())
				default:
				}
				return util.RemoveAll(filepath.Join(repo.RepoPath(), "archives"))
			})
}

// DeleteOldRepositoryArchives deletes old repository archives.
func DeleteOldRepositoryArchives(ctx context.Context, olderThan time.Duration) error {
	log.Trace("Doing: ArchiveCleanup")

	if err := x.Where("id > 0").Iterate(new(Repository), func(idx int, bean interface{}) error {
		return deleteOldRepositoryArchives(ctx, olderThan, idx, bean)
	}); err != nil {
		log.Trace("Error: ArchiveClean: %v", err)
		return err
	}

	log.Trace("Finished: ArchiveCleanup")
	return nil
}

func deleteOldRepositoryArchives(ctx context.Context, olderThan time.Duration, idx int, bean interface{}) error {
	repo := bean.(*Repository)
	basePath := filepath.Join(repo.RepoPath(), "archives")

	for _, ty := range []string{"zip", "targz"} {
		select {
		case <-ctx.Done():
			return ErrCancelledf("before deleting old repository archives with filetype %s for %s", ty, repo.FullName())
		default:
		}

		path := filepath.Join(basePath, ty)
		file, err := os.Open(path)
		if err != nil {
			if !os.IsNotExist(err) {
				log.Warn("Unable to open directory %s: %v", path, err)
				return err
			}

			// If the directory doesn't exist, that's okay.
			continue
		}

		files, err := file.Readdir(0)
		file.Close()
		if err != nil {
			log.Warn("Unable to read directory %s: %v", path, err)
			return err
		}

		minimumOldestTime := time.Now().Add(-olderThan)
		for _, info := range files {
			if info.ModTime().Before(minimumOldestTime) && !info.IsDir() {
				select {
				case <-ctx.Done():
					return ErrCancelledf("before deleting old repository archive file %s with filetype %s for %s", info.Name(), ty, repo.FullName())
				default:
				}
				toDelete := filepath.Join(path, info.Name())
				// This is a best-effort purge, so we do not check error codes to confirm removal.
				if err = util.Remove(toDelete); err != nil {
					log.Trace("Unable to delete %s, but proceeding: %v", toDelete, err)
				}
			}
		}
	}

	return nil
}

type repoChecker struct {
	querySQL, correctSQL string
	desc                 string
}

func repoStatsCheck(ctx context.Context, checker *repoChecker) {
	results, err := x.Query(checker.querySQL)
	if err != nil {
		log.Error("Select %s: %v", checker.desc, err)
		return
	}
	for _, result := range results {
		id, _ := strconv.ParseInt(string(result["id"]), 10, 64)
		select {
		case <-ctx.Done():
			log.Warn("CheckRepoStats: Cancelled before checking %s for Repo[%d]", checker.desc, id)
			return
		default:
		}
		log.Trace("Updating %s: %d", checker.desc, id)
		_, err = x.Exec(checker.correctSQL, id, id)
		if err != nil {
			log.Error("Update %s[%d]: %v", checker.desc, id, err)
		}
	}
}

// CheckRepoStats checks the repository stats
func CheckRepoStats(ctx context.Context) error {
	log.Trace("Doing: CheckRepoStats")

	checkers := []*repoChecker{
		// Repository.NumWatches
		{
			"SELECT repo.id FROM `repository` repo WHERE repo.num_watches!=(SELECT COUNT(*) FROM `watch` WHERE repo_id=repo.id AND mode<>2)",
			"UPDATE `repository` SET num_watches=(SELECT COUNT(*) FROM `watch` WHERE repo_id=? AND mode<>2) WHERE id=?",
			"repository count 'num_watches'",
		},
		// Repository.NumStars
		{
			"SELECT repo.id FROM `repository` repo WHERE repo.num_stars!=(SELECT COUNT(*) FROM `star` WHERE repo_id=repo.id)",
			"UPDATE `repository` SET num_stars=(SELECT COUNT(*) FROM `star` WHERE repo_id=?) WHERE id=?",
			"repository count 'num_stars'",
		},
		// Label.NumIssues
		{
			"SELECT label.id FROM `label` WHERE label.num_issues!=(SELECT COUNT(*) FROM `issue_label` WHERE label_id=label.id)",
			"UPDATE `label` SET num_issues=(SELECT COUNT(*) FROM `issue_label` WHERE label_id=?) WHERE id=?",
			"label count 'num_issues'",
		},
		// User.NumRepos
		{
			"SELECT `user`.id FROM `user` WHERE `user`.num_repos!=(SELECT COUNT(*) FROM `repository` WHERE owner_id=`user`.id)",
			"UPDATE `user` SET num_repos=(SELECT COUNT(*) FROM `repository` WHERE owner_id=?) WHERE id=?",
			"user count 'num_repos'",
		},
		// Issue.NumComments
		{
			"SELECT `issue`.id FROM `issue` WHERE `issue`.num_comments!=(SELECT COUNT(*) FROM `comment` WHERE issue_id=`issue`.id AND type=0)",
			"UPDATE `issue` SET num_comments=(SELECT COUNT(*) FROM `comment` WHERE issue_id=? AND type=0) WHERE id=?",
			"issue count 'num_comments'",
		},
	}
	for _, checker := range checkers {
		select {
		case <-ctx.Done():
			log.Warn("CheckRepoStats: Cancelled before %s", checker.desc)
			return ErrCancelledf("before checking %s", checker.desc)
		default:
			repoStatsCheck(ctx, checker)
		}
	}

	// ***** START: Repository.NumClosedIssues *****
	desc := "repository count 'num_closed_issues'"
	results, err := x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_closed_issues!=(SELECT COUNT(*) FROM `issue` WHERE repo_id=repo.id AND is_closed=? AND is_pull=?)", true, false)
	if err != nil {
		log.Error("Select %s: %v", desc, err)
	} else {
		for _, result := range results {
			id, _ := strconv.ParseInt(string(result["id"]), 10, 64)
			select {
			case <-ctx.Done():
				log.Warn("CheckRepoStats: Cancelled during %s for repo ID %d", desc, id)
				return ErrCancelledf("during %s for repo ID %d", desc, id)
			default:
			}
			log.Trace("Updating %s: %d", desc, id)
			_, err = x.Exec("UPDATE `repository` SET num_closed_issues=(SELECT COUNT(*) FROM `issue` WHERE repo_id=? AND is_closed=? AND is_pull=?) WHERE id=?", id, true, false, id)
			if err != nil {
				log.Error("Update %s[%d]: %v", desc, id, err)
			}
		}
	}
	// ***** END: Repository.NumClosedIssues *****

	// ***** START: Repository.NumClosedPulls *****
	desc = "repository count 'num_closed_pulls'"
	results, err = x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_closed_pulls!=(SELECT COUNT(*) FROM `issue` WHERE repo_id=repo.id AND is_closed=? AND is_pull=?)", true, true)
	if err != nil {
		log.Error("Select %s: %v", desc, err)
	} else {
		for _, result := range results {
			id, _ := strconv.ParseInt(string(result["id"]), 10, 64)
			select {
			case <-ctx.Done():
				log.Warn("CheckRepoStats: Cancelled")
				return ErrCancelledf("during %s for repo ID %d", desc, id)
			default:
			}
			log.Trace("Updating %s: %d", desc, id)
			_, err = x.Exec("UPDATE `repository` SET num_closed_pulls=(SELECT COUNT(*) FROM `issue` WHERE repo_id=? AND is_closed=? AND is_pull=?) WHERE id=?", id, true, true, id)
			if err != nil {
				log.Error("Update %s[%d]: %v", desc, id, err)
			}
		}
	}
	// ***** END: Repository.NumClosedPulls *****

	// FIXME: use checker when stop supporting old fork repo format.
	// ***** START: Repository.NumForks *****
	results, err = x.Query("SELECT repo.id FROM `repository` repo WHERE repo.num_forks!=(SELECT COUNT(*) FROM `repository` WHERE fork_id=repo.id)")
	if err != nil {
		log.Error("Select repository count 'num_forks': %v", err)
	} else {
		for _, result := range results {
			id, _ := strconv.ParseInt(string(result["id"]), 10, 64)
			select {
			case <-ctx.Done():
				log.Warn("CheckRepoStats: Cancelled")
				return ErrCancelledf("during %s for repo ID %d", desc, id)
			default:
			}
			log.Trace("Updating repository count 'num_forks': %d", id)

			repo, err := GetRepositoryByID(id)
			if err != nil {
				log.Error("GetRepositoryByID[%d]: %v", id, err)
				continue
			}

			rawResult, err := x.Query("SELECT COUNT(*) FROM `repository` WHERE fork_id=?", repo.ID)
			if err != nil {
				log.Error("Select count of forks[%d]: %v", repo.ID, err)
				continue
			}
			repo.NumForks = int(parseCountResult(rawResult))

			if err = UpdateRepository(repo, false); err != nil {
				log.Error("UpdateRepository[%d]: %v", id, err)
				continue
			}
		}
	}
	// ***** END: Repository.NumForks *****
	return nil
}

// SetArchiveRepoState sets if a repo is archived
func (repo *Repository) SetArchiveRepoState(isArchived bool) (err error) {
	repo.IsArchived = isArchived
	_, err = x.Where("id = ?", repo.ID).Cols("is_archived").NoAutoTime().Update(repo)
	return
}

// ___________           __
// \_   _____/__________|  | __
//  |    __)/  _ \_  __ \  |/ /
//  |     \(  <_> )  | \/    <
//  \___  / \____/|__|  |__|_ \
//      \/                   \/

// HasForkedRepo checks if given user has already forked a repository with given ID.
func HasForkedRepo(ownerID, repoID int64) (*Repository, bool) {
	repo := new(Repository)
	has, _ := x.
		Where("owner_id=? AND fork_id=?", ownerID, repoID).
		Get(repo)
	return repo, has
}

// CopyLFS copies LFS data from one repo to another
func CopyLFS(ctx DBContext, newRepo, oldRepo *Repository) error {
	var lfsObjects []*LFSMetaObject
	if err := ctx.e.Where("repository_id=?", oldRepo.ID).Find(&lfsObjects); err != nil {
		return err
	}

	for _, v := range lfsObjects {
		v.ID = 0
		v.RepositoryID = newRepo.ID
		if _, err := ctx.e.Insert(v); err != nil {
			return err
		}
	}

	return nil
}

// GetForks returns all the forks of the repository
func (repo *Repository) GetForks(listOptions ListOptions) ([]*Repository, error) {
	if listOptions.Page == 0 {
		forks := make([]*Repository, 0, repo.NumForks)
		return forks, x.Find(&forks, &Repository{ForkID: repo.ID})
	}

	sess := listOptions.getPaginatedSession()
	forks := make([]*Repository, 0, listOptions.PageSize)
	return forks, sess.Find(&forks, &Repository{ForkID: repo.ID})
}

// GetUserFork return user forked repository from this repository, if not forked return nil
func (repo *Repository) GetUserFork(userID int64) (*Repository, error) {
	var forkedRepo Repository
	has, err := x.Where("fork_id = ?", repo.ID).And("owner_id = ?", userID).Get(&forkedRepo)
	if err != nil {
		return nil, err
	}
	if !has {
		return nil, nil
	}
	return &forkedRepo, nil
}

// GetOriginalURLHostname returns the hostname of a URL or the URL
func (repo *Repository) GetOriginalURLHostname() string {
	u, err := url.Parse(repo.OriginalURL)
	if err != nil {
		return repo.OriginalURL
	}

	return u.Host
}

// GetTreePathLock returns LSF lock for the treePath
func (repo *Repository) GetTreePathLock(treePath string) (*LFSLock, error) {
	if setting.LFS.StartServer {
		locks, err := GetLFSLockByRepoID(repo.ID, 0, 0)
		if err != nil {
			return nil, err
		}
		for _, lock := range locks {
			if lock.Path == treePath {
				return lock, nil
			}
		}
	}
	return nil, nil
}

func updateRepositoryCols(e Engine, repo *Repository, cols ...string) error {
	_, err := e.ID(repo.ID).Cols(cols...).Update(repo)
	return err
}

// UpdateRepositoryCols updates repository's columns
func UpdateRepositoryCols(repo *Repository, cols ...string) error {
	return updateRepositoryCols(x, repo, cols...)
}

// GetTrustModel will get the TrustModel for the repo or the default trust model
func (repo *Repository) GetTrustModel() TrustModelType {
	trustModel := repo.TrustModel
	if trustModel == DefaultTrustModel {
		trustModel = ToTrustModel(setting.Repository.Signing.DefaultTrustModel)
		if trustModel == DefaultTrustModel {
			return CollaboratorTrustModel
		}
	}
	return trustModel
}

// DoctorUserStarNum recalculate Stars number for all user
func DoctorUserStarNum() (err error) {
	const batchSize = 100
	sess := x.NewSession()
	defer sess.Close()

	for start := 0; ; start += batchSize {
		users := make([]User, 0, batchSize)
		if err = sess.Limit(batchSize, start).Where("type = ?", 0).Cols("id").Find(&users); err != nil {
			return
		}
		if len(users) == 0 {
			break
		}

		if err = sess.Begin(); err != nil {
			return
		}

		for _, user := range users {
			if _, err = sess.Exec("UPDATE `user` SET num_stars=(SELECT COUNT(*) FROM `star` WHERE uid=?) WHERE id=?", user.ID, user.ID); err != nil {
				return
			}
		}

		if err = sess.Commit(); err != nil {
			return
		}
	}

	log.Debug("recalculate Stars number for all user finished")

	return
}

// IterateRepository iterate repositories
func IterateRepository(f func(repo *Repository) error) error {
	var start int
	var batchSize = setting.Database.IterateBufferSize
	for {
		var repos = make([]*Repository, 0, batchSize)
		if err := x.Limit(batchSize, start).Find(&repos); err != nil {
			return err
		}
		if len(repos) == 0 {
			return nil
		}
		start += len(repos)

		for _, repo := range repos {
			if err := f(repo); err != nil {
				return err
			}
		}
	}
}