Option to init empty wiki Git remote repository upon repository creation

This fixes github issue #7226

conf/app.ini

@@ -119,6 +119,8 @@ ENABLE_RAW_FILE_RENDER_MODE = false
 COMMITS_FETCH_CONCURRENCY = 0
 ; Default branch name when creating new repositories.
 DEFAULT_BRANCH = master
+; Wether to automatically create wiki repos if they do not exist, but are enabled
+AUTOCREATE_WIKI = true
 
 [repository.editor]
 ; List of file extensions that should have line wraps in the CodeMirror editor.

internal/cmd/serv.go

@@ -10,9 +10,11 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"strings"
 	"time"
 
+	"github.com/gogs/git-module"
 	"github.com/unknwon/com"
 	"github.com/urfave/cli"
 	log "unknwon.dev/clog/v2"
@@ -132,6 +134,8 @@ var allowedCommands = map[string]db.AccessMode{
 	"git-receive-pack":   db.AccessModeWrite,
 }
 
+var reWikiRepo = regexp.MustCompile("\\.wiki(?:\\.git)?$")
+
 func runServ(c *cli.Context) error {
 	ctx := context.Background()
 	setup(c, "serv.log", true)
@@ -254,6 +258,17 @@ func runServ(c *cli.Context) error {
 		verb = strings.Replace(verb, "-", " ", 1)
 	}
 
+	repoFsPath := fmt.Sprintf("%s/%s.git", conf.Repository.Root, strings.TrimSuffix(repoFullName, ".git"))
+	if _, err := os.Stat(repoFsPath); err != nil {
+		if conf.Repository.AutocreateWiki && repo.EnableWiki && reWikiRepo.MatchString(repoFullName) && requestMode == db.AccessModeWrite {
+			if err = git.Init(repoFsPath, git.InitOptions{ Bare: true }); err != nil {
+				fail("Internal error", "Failed to initialize new git repo %s: %v", repoFullName, err)
+			}
+		} else {
+			fail("Internal error", "Repository %v doesn't exist!", repoFullName)
+		}
+	}
+
 	var gitCmd *exec.Cmd
 	verbs := strings.Split(verb, " ")
 	if len(verbs) == 2 {

internal/conf/static.go

@@ -323,6 +323,7 @@ type RepositoryOpts struct {
 	EnableRawFileRenderMode  bool
 	CommitsFetchConcurrency  int
 	DefaultBranch            string
+	AutocreateWiki           bool
 
 	// Repository editor settings
 	Editor struct {