Restore creation of git-daemon-export-ok files (#16508)

Somewhere along the line the creation of git-daemon-export-ok
files disappeared but the updating of these files when
repo visibility changes remained. The problem is that the
current state will create files even when the org or user
is private.

This PR restores creation correctly.

Fix #15521

Signed-off-by: Andrew Thornton <art27@cantab.net>

modules/doctor/misc.go

@@ -6,7 +6,9 @@ package doctor
 
 import (
 	"fmt"
+	"os"
 	"os/exec"
+	"path"
 	"strings"
 
 	"code.gitea.io/gitea/models"
@@ -14,6 +16,9 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/repository"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+	lru "github.com/hashicorp/golang-lru"
 	"xorm.io/builder"
 )
 
@@ -75,6 +80,7 @@ func checkUserStarNum(logger log.Logger, autofix bool) error {
 func checkEnablePushOptions(logger log.Logger, autofix bool) error {
 	numRepos := 0
 	numNeedUpdate := 0
+
 	if err := iterateRepositories(func(repo *models.Repository) error {
 		numRepos++
 		r, err := git.OpenRepository(repo.RepoPath())
@@ -114,6 +120,66 @@ func checkEnablePushOptions(logger log.Logger, autofix bool) error {
 	return nil
 }
 
+func checkDaemonExport(logger log.Logger, autofix bool) error {
+	numRepos := 0
+	numNeedUpdate := 0
+	cache, err := lru.New(512)
+	if err != nil {
+		logger.Critical("Unable to create cache: %v", err)
+		return err
+	}
+	if err := iterateRepositories(func(repo *models.Repository) error {
+		numRepos++
+
+		if owner, has := cache.Get(repo.OwnerID); has {
+			repo.Owner = owner.(*models.User)
+		} else {
+			if err := repo.GetOwner(); err != nil {
+				return err
+			}
+			cache.Add(repo.OwnerID, repo.Owner)
+		}
+
+		// 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
+		}
+		isPublic := !repo.IsPrivate && repo.Owner.Visibility == structs.VisibleTypePublic
+
+		if isPublic != isExist {
+			numNeedUpdate++
+			if autofix {
+				if !isPublic && isExist {
+					if err = util.Remove(daemonExportFile); err != nil {
+						log.Error("Failed to remove %s: %v", daemonExportFile, err)
+					}
+				} else if isPublic && !isExist {
+					if f, err := os.Create(daemonExportFile); err != nil {
+						log.Error("Failed to create %s: %v", daemonExportFile, err)
+					} else {
+						f.Close()
+					}
+				}
+			}
+		}
+		return nil
+	}); err != nil {
+		logger.Critical("Unable to checkDaemonExport: %v", err)
+		return err
+	}
+
+	if autofix {
+		logger.Info("Updated git-daemon-export-ok files for %d of %d repositories.", numNeedUpdate, numRepos)
+	} else {
+		logger.Info("Checked %d repositories, %d need updates.", numRepos, numNeedUpdate)
+	}
+
+	return nil
+}
+
 func init() {
 	Register(&Check{
 		Title:     "Check if SCRIPT_TYPE is available",
@@ -143,4 +209,11 @@ func init() {
 		Run:       checkEnablePushOptions,
 		Priority:  7,
 	})
+	Register(&Check{
+		Title:     "Check git-daemon-export-ok files",
+		Name:      "check-git-daemon-export-ok",
+		IsDefault: false,
+		Run:       checkDaemonExport,
+		Priority:  8,
+	})
 }