Allow instance-wide disabling of forking

For small, personal self-hosted instances with no user signups, the fork
button is just a noise. This patch allows disabling them like stars can
be disabled too.

Disabling forks does not only remove the buttons from the web UI, it
also disables the routes that could be used to create forks.

Fixes #2441.

Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>

custom/conf/app.example.ini

@@ -991,6 +991,9 @@ LEVEL = Info
 ;; Disable stars feature.
 ;DISABLE_STARS = false
 ;;
+;; Disable repository forking.
+;DISABLE_FORKS = false
+;;
 ;; The default branch name of new repositories
 ;DEFAULT_BRANCH = main
 ;;

modules/context/context.go

@@ -198,6 +198,7 @@ func Contexter() func(next http.Handler) http.Handler {
 			// FIXME: do we really always need these setting? There should be someway to have to avoid having to always set these
 			ctx.Data["DisableMigrations"] = setting.Repository.DisableMigrations
 			ctx.Data["DisableStars"] = setting.Repository.DisableStars
+			ctx.Data["DisableForks"] = setting.Repository.DisableForks
 			ctx.Data["EnableActions"] = setting.Actions.Enabled
 
 			ctx.Data["ManifestData"] = setting.ManifestData

modules/setting/repository.go

@@ -50,6 +50,7 @@ var (
 		PrefixArchiveFiles                      bool
 		DisableMigrations                       bool
 		DisableStars                            bool `ini:"DISABLE_STARS"`
+		DisableForks                            bool
 		DefaultBranch                           string
 		AllowAdoptionOfUnadoptedRepositories    bool
 		AllowDeleteOfUnadoptedRepositories      bool
@@ -172,6 +173,7 @@ var (
 		PrefixArchiveFiles:                      true,
 		DisableMigrations:                       false,
 		DisableStars:                            false,
+		DisableForks:                            false,
 		DefaultBranch:                           "main",
 		AllowForkWithoutMaximumLimit:            true,
 

modules/structs/settings.go

@@ -9,6 +9,7 @@ type GeneralRepoSettings struct {
 	HTTPGitDisabled      bool `json:"http_git_disabled"`
 	MigrationsDisabled   bool `json:"migrations_disabled"`
 	StarsDisabled        bool `json:"stars_disabled"`
+	ForksDisabled        bool `json:"forks_disabled"`
 	TimeTrackingDisabled bool `json:"time_tracking_disabled"`
 	LFSDisabled          bool `json:"lfs_disabled"`
 }

routers/api/v1/api.go

@@ -1161,8 +1161,10 @@ func Routes() *web.Route {
 				m.Get("/raw/*", context.ReferencesGitRepo(), context.RepoRefForAPI, reqRepoReader(unit.TypeCode), repo.GetRawFile)
 				m.Get("/media/*", context.ReferencesGitRepo(), context.RepoRefForAPI, reqRepoReader(unit.TypeCode), repo.GetRawFileOrLFS)
 				m.Get("/archive/*", reqRepoReader(unit.TypeCode), repo.GetArchive)
+				if !setting.Repository.DisableForks {
 					m.Combo("/forks").Get(repo.ListForks).
 						Post(reqToken(), reqRepoReader(unit.TypeCode), bind(api.CreateForkOption{}), repo.CreateFork)
+				}
 				m.Group("/branches", func() {
 					m.Get("", repo.ListBranches)
 					m.Get("/*", repo.GetBranch)

routers/api/v1/settings/settings.go

@@ -61,6 +61,7 @@ func GetGeneralRepoSettings(ctx *context.APIContext) {
 		HTTPGitDisabled:      setting.Repository.DisableHTTPGit,
 		MigrationsDisabled:   setting.Repository.DisableMigrations,
 		StarsDisabled:        setting.Repository.DisableStars,
+		ForksDisabled:        setting.Repository.DisableForks,
 		TimeTrackingDisabled: !setting.Service.EnableTimetracking,
 		LFSDisabled:          !setting.LFS.StartServer,
 	})

routers/web/web.go

@@ -968,7 +968,9 @@ func registerRoutes(m *web.Route) {
 		m.Post("/create", web.Bind(forms.CreateRepoForm{}), repo.CreatePost)
 		m.Get("/migrate", repo.Migrate)
 		m.Post("/migrate", web.Bind(forms.MigrateRepoForm{}), repo.MigratePost)
+		if !setting.Repository.DisableForks {
 			m.Get("/fork/{repoid}", context.RepoIDAssignment(), context.UnitTypes(), reqRepoCodeReader, repo.ForkByID)
+		}
 		m.Get("/search", repo.SearchRepo)
 	}, reqSignIn)
 
@@ -1148,8 +1150,10 @@ func registerRoutes(m *web.Route) {
 
 	// Grouping for those endpoints that do require authentication
 	m.Group("/{username}/{reponame}", func() {
+		if !setting.Repository.DisableForks {
 			m.Combo("/fork", reqRepoCodeReader).Get(repo.Fork).
 				Post(web.Bind(forms.CreateRepoForm{}), repo.ForkPost)
+		}
 		m.Group("/issues", func() {
 			m.Group("/new", func() {
 				m.Combo("").Get(context.RepoRef(), repo.NewIssue).
@@ -1560,9 +1564,11 @@ func registerRoutes(m *web.Route) {
 			m.Get("/*", context.RepoRefByType(context.RepoRefLegacy), repo.Home)
 		}, repo.SetEditorconfigIfExists)
 
+		if !setting.Repository.DisableForks {
 			m.Group("", func() {
 				m.Get("/forks", repo.Forks)
 			}, context.RepoRef(), reqRepoCodeReader)
+		}
 		m.Get("/commit/{sha:([a-f0-9]{4,64})}.{ext:patch|diff}", repo.MustBeNotEmpty, reqRepoCodeReader, repo.RawDiff)
 	}, ignSignIn, context.RepoAssignment, context.UnitTypes())
 

templates/explore/repo_list.tmpl

@@ -39,7 +39,9 @@
 						{{if not $.DisableStars}}
 							<a class="text grey flex-text-inline" href="{{.Link}}/stars">{{svg "octicon-star" 16}}{{.NumStars}}</a>
 						{{end}}
+						{{if not $.DisableForks}}
 							<a class="text grey flex-text-inline" href="{{.Link}}/forks">{{svg "octicon-git-branch" 16}}{{.NumForks}}</a>
+						{{end}}
 					</div>
 				</div>
 				{{$description := .DescriptionHTML $.Context}}

templates/explore/repo_search.tmpl

@@ -29,8 +29,10 @@
 				<a class="{{if eq .SortType "moststars"}}active {{end}}item" href="{{$.Link}}?tab={{$.TabName}}&sort=moststars&q={{$.Keyword}}&language={{$.Language}}">{{ctx.Locale.Tr "repo.issues.filter_sort.moststars"}}</a>
 				<a class="{{if eq .SortType "feweststars"}}active {{end}}item" href="{{$.Link}}?tab={{$.TabName}}&sort=feweststars&q={{$.Keyword}}&language={{$.Language}}">{{ctx.Locale.Tr "repo.issues.filter_sort.feweststars"}}</a>
 			{{end}}
+			{{if not .DisableForks}}
 				<a class="{{if eq .SortType "mostforks"}}active {{end}}item" href="{{$.Link}}?tab={{$.TabName}}&sort=mostforks&q={{$.Keyword}}&language={{$.Language}}">{{ctx.Locale.Tr "repo.issues.filter_sort.mostforks"}}</a>
 				<a class="{{if eq .SortType "fewestforks"}}active {{end}}item" href="{{$.Link}}?tab={{$.TabName}}&sort=fewestforks&q={{$.Keyword}}&language={{$.Language}}">{{ctx.Locale.Tr "repo.issues.filter_sort.fewestforks"}}</a>
+			{{end}}
 		</div>
 	</div>
 </div>

templates/repo/header.tmpl

@@ -62,55 +62,8 @@
 					{{if not $.DisableStars}}
 					{{template "repo/star_unstar" $}}
 					{{end}}
-					{{if and (not .IsEmpty) ($.Permission.CanRead $.UnitTypeCode)}}
-						<div class="ui labeled button
-							{{if or (not $.IsSigned) (and (not $.CanSignedUserFork) (not $.UserAndOrgForks))}}
-								disabled
-							{{end}}"
-							{{if not $.IsSigned}}
-								data-tooltip-content="{{ctx.Locale.Tr "repo.fork_guest_user"}}"
-							{{else if and (not $.CanSignedUserFork) (not $.UserAndOrgForks)}}
-								data-tooltip-content="{{ctx.Locale.Tr "repo.fork_from_self"}}"
-							{{end}}
-						>
-							<a class="ui compact{{if $.ShowForkModal}} show-modal{{end}} small basic button"
-								{{if not $.CanSignedUserFork}}
-									{{if gt (len $.UserAndOrgForks) 1}}
-										data-modal="#fork-repo-modal"
-									{{else if eq (len $.UserAndOrgForks) 1}}
-										href="{{AppSubUrl}}/{{(index $.UserAndOrgForks 0).FullName}}"
-									{{/*else is not required here, because the button shouldn't link to any site if you can't create a fork*/}}
-									{{end}}
-								{{else if not $.UserAndOrgForks}}
-									href="{{$.RepoLink}}/fork"
-								{{else}}
-									data-modal="#fork-repo-modal"
-								{{end}}
-							>
-								{{svg "octicon-repo-forked"}}<span class="text">{{ctx.Locale.Tr "repo.fork"}}</span>
-							</a>
-							<div class="ui small modal" id="fork-repo-modal">
-								<div class="header">
-									{{ctx.Locale.Tr "repo.already_forked" .Name}}
-								</div>
-								<div class="content gt-text-left">
-									<div class="ui list">
-										{{range $.UserAndOrgForks}}
-											<div class="ui item gt-py-3">
-												<a href="{{.Link}}">{{svg "octicon-repo-forked" 16 "gt-mr-3"}}{{.FullName}}</a>
-											</div>
-										{{end}}
-									</div>
-									{{if $.CanSignedUserFork}}
-									<div class="divider"></div>
-									<a href="{{$.RepoLink}}/fork">{{ctx.Locale.Tr "repo.fork_to_different_account"}}</a>
-									{{end}}
-								</div>
-							</div>
-							<a class="ui basic label" href="{{.Link}}/forks">
-								{{CountFmt .NumForks}}
-							</a>
-						</div>
+					{{if not $.DisableForks}}
+					{{template "repo/header_fork" $}}
 					{{end}}
 				</div>
 			{{end}}

templates/repo/header_fork.tmpl

@@ -0,0 +1,50 @@
+{{if and (not .IsEmpty) ($.Permission.CanRead $.UnitTypeCode)}}
+	<div class="ui labeled button
+		{{if or (not $.IsSigned) (and (not $.CanSignedUserFork) (not $.UserAndOrgForks))}}
+			disabled
+		{{end}}"
+		{{if not $.IsSigned}}
+			data-tooltip-content="{{ctx.Locale.Tr "repo.fork_guest_user"}}"
+		{{else if and (not $.CanSignedUserFork) (not $.UserAndOrgForks)}}
+			data-tooltip-content="{{ctx.Locale.Tr "repo.fork_from_self"}}"
+		{{end}}
+	>
+		<a class="ui compact{{if $.ShowForkModal}} show-modal{{end}} small basic button"
+			{{if not $.CanSignedUserFork}}
+				{{if gt (len $.UserAndOrgForks) 1}}
+					data-modal="#fork-repo-modal"
+				{{else if eq (len $.UserAndOrgForks) 1}}
+					href="{{AppSubUrl}}/{{(index $.UserAndOrgForks 0).FullName}}"
+				{{/*else is not required here, because the button shouldn't link to any site if you can't create a fork*/}}
+				{{end}}
+			{{else if not $.UserAndOrgForks}}
+				href="{{$.RepoLink}}/fork"
+			{{else}}
+				data-modal="#fork-repo-modal"
+			{{end}}
+		>
+			{{svg "octicon-repo-forked"}}<span class="text">{{ctx.Locale.Tr "repo.fork"}}</span>
+		</a>
+		<div class="ui small modal" id="fork-repo-modal">
+			<div class="header">
+				{{ctx.Locale.Tr "repo.already_forked" .Name}}
+			</div>
+			<div class="content gt-text-left">
+				<div class="ui list">
+					{{range $.UserAndOrgForks}}
+						<div class="ui item gt-py-3">
+							<a href="{{.Link}}">{{svg "octicon-repo-forked" 16 "gt-mr-3"}}{{.FullName}}</a>
+						</div>
+					{{end}}
+				</div>
+				{{if $.CanSignedUserFork}}
+				<div class="divider"></div>
+				<a href="{{$.RepoLink}}/fork">{{ctx.Locale.Tr "repo.fork_to_different_account"}}</a>
+				{{end}}
+			</div>
+		</div>
+		<a class="ui basic label" href="{{.Link}}/forks">
+			{{CountFmt .NumForks}}
+		</a>
+	</div>
+{{end}}

templates/swagger/v1_json.tmpl

@@ -20565,6 +20565,10 @@
       "description": "GeneralRepoSettings contains global repository settings exposed by API",
       "type": "object",
       "properties": {
+        "forks_disabled": {
+          "type": "boolean",
+          "x-go-name": "ForksDisabled"
+        },
         "http_git_disabled": {
           "type": "boolean",
           "x-go-name": "HTTPGitDisabled"

tests/integration/api_fork_test.go

@@ -1,13 +1,18 @@
 // Copyright 2017 The Gogs Authors. All rights reserved.
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
 // SPDX-License-Identifier: MIT
 
 package integration
 
 import (
 	"net/http"
+	"net/url"
 	"testing"
 
+	"code.gitea.io/gitea/modules/setting"
 	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/routers"
 	"code.gitea.io/gitea/tests"
 )
 
@@ -16,3 +21,27 @@ func TestCreateForkNoLogin(t *testing.T) {
 	req := NewRequestWithJSON(t, "POST", "/api/v1/repos/user2/repo1/forks", &api.CreateForkOption{})
 	MakeRequest(t, req, http.StatusUnauthorized)
 }
+
+func TestAPIDisabledForkRepo(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		defer test.MockVariableValue(&setting.Repository.DisableForks, true)()
+		defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+		t.Run("fork listing", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			req := NewRequest(t, "GET", "/api/v1/repos/user2/repo1/forks")
+			MakeRequest(t, req, http.StatusNotFound)
+		})
+
+		t.Run("forking", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			session := loginUser(t, "user5")
+			token := getTokenForLoggedInUser(t, session)
+
+			req := NewRequestWithJSON(t, "POST", "/api/v1/repos/user2/repo1/forks", &api.CreateForkOption{}).AddTokenAuth(token)
+			session.MakeRequest(t, req, http.StatusNotFound)
+		})
+	})
+}

tests/integration/repo_fork_test.go

@@ -1,4 +1,5 @@
 // Copyright 2017 The Gitea Authors. All rights reserved.
+// Copyright 2024 The Forgejo Authors c/o Codeberg e.V.. All rights reserved.
 // SPDX-License-Identifier: MIT
 
 package integration
@@ -14,6 +15,9 @@ import (
 	repo_model "code.gitea.io/gitea/models/repo"
 	"code.gitea.io/gitea/models/unittest"
 	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/routers"
 	repo_service "code.gitea.io/gitea/services/repository"
 	"code.gitea.io/gitea/tests"
 
@@ -119,6 +123,48 @@ func TestRepoFork(t *testing.T) {
 				session.MakeRequest(t, req, http.StatusNotFound)
 			})
 		})
+
+		t.Run("DISABLE_FORKS", func(t *testing.T) {
+			defer test.MockVariableValue(&setting.Repository.DisableForks, true)()
+			defer test.MockVariableValue(&testWebRoutes, routers.NormalRoutes())()
+
+			t.Run("fork button not present", func(t *testing.T) {
+				defer tests.PrintCurrentTest(t)()
+
+				// The "Fork" button should not appear on the repo home
+				req := NewRequest(t, "GET", "/user2/repo1")
+				resp := MakeRequest(t, req, http.StatusOK)
+				htmlDoc := NewHTMLParser(t, resp.Body)
+				htmlDoc.AssertElement(t, "[href=/user2/repo1/fork]", false)
+			})
+
+			t.Run("forking by URL", func(t *testing.T) {
+				t.Run("by name", func(t *testing.T) {
+					defer tests.PrintCurrentTest(t)()
+
+					// Forking by URL should be Not Found
+					req := NewRequest(t, "GET", "/user2/repo1/fork")
+					session.MakeRequest(t, req, http.StatusNotFound)
+				})
+
+				t.Run("by legacy URL", func(t *testing.T) {
+					defer tests.PrintCurrentTest(t)()
+
+					// Forking by legacy URL should be Not Found
+					repo := unittest.AssertExistsAndLoadBean(t, &repo_model.Repository{ID: 1}) // user2/repo1
+					req := NewRequestf(t, "GET", "/repo/fork/%d", repo.ID)
+					session.MakeRequest(t, req, http.StatusNotFound)
+				})
+			})
+
+			t.Run("fork listing", func(t *testing.T) {
+				defer tests.PrintCurrentTest(t)()
+
+				// Listing the forks should be Not Found, too
+				req := NewRequest(t, "GET", "/user2/repo1/forks")
+				MakeRequest(t, req, http.StatusNotFound)
+			})
+		})
 	})
 }