[BUG] Reflect Cargo index state in settings

- Currently in the Cargo section of the packages setting menu two
buttons are always shown, "Initalize index" and "Rebuild index", however
only of these should be shown depending on the state of the index, if
there's no index the "Initalize index" button should be shown and if
there's an index the "Rebuild index" button should be shown. This patch
does exactly that.
- Resolves #2628

options/locale/locale_en-US.ini

@@ -3568,6 +3568,7 @@ owner.settings.cargo.rebuild = Rebuild index
 owner.settings.cargo.rebuild.description = Rebuilding can be useful if the index is not synchronized with the stored Cargo packages.
 owner.settings.cargo.rebuild.error = Failed to rebuild Cargo index: %v
 owner.settings.cargo.rebuild.success = The Cargo index was successfully rebuild.
+owner.settings.cargo.rebuild.no_index = Cannot rebuild, no index is initialized.
 owner.settings.cleanuprules.title = Manage cleanup rules
 owner.settings.cleanuprules.add = Add cleanup rule
 owner.settings.cleanuprules.edit = Edit cleanup rule

routers/web/shared/packages/packages.go

@@ -4,16 +4,19 @@
 package packages
 
 import (
+	"errors"
 	"fmt"
 	"net/http"
 	"time"
 
 	"code.gitea.io/gitea/models/db"
 	packages_model "code.gitea.io/gitea/models/packages"
+	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/optional"
+	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/services/context"
 	"code.gitea.io/gitea/services/forms"
@@ -29,6 +32,12 @@ func SetPackagesContext(ctx *context.Context, owner *user_model.User) {
 	}
 
 	ctx.Data["CleanupRules"] = pcrs
+
+	ctx.Data["CargoIndexExists"], err = repo_model.IsRepositoryModelExist(ctx, owner, cargo_service.IndexRepositoryName)
+	if err != nil {
+		ctx.ServerError("IsRepositoryModelExist", err)
+		return
+	}
 }
 
 func SetRuleAddContext(ctx *context.Context) {
@@ -240,7 +249,11 @@ func RebuildCargoIndex(ctx *context.Context, owner *user_model.User) {
 	err := cargo_service.RebuildIndex(ctx, owner, owner)
 	if err != nil {
 		log.Error("RebuildIndex failed: %v", err)
+		if errors.Is(err, util.ErrNotExist) {
+			ctx.Flash.Error(ctx.Tr("packages.owner.settings.cargo.rebuild.no_index"))
+		} else {
 			ctx.Flash.Error(ctx.Tr("packages.owner.settings.cargo.rebuild.error", err))
+		}
 	} else {
 		ctx.Flash.Success(ctx.Tr("packages.owner.settings.cargo.rebuild.success"))
 	}

services/packages/cargo/index.go

@@ -62,9 +62,9 @@ func InitializeIndexRepository(ctx context.Context, doer, owner *user_model.User
 }
 
 func RebuildIndex(ctx context.Context, doer, owner *user_model.User) error {
-	repo, err := getOrCreateIndexRepository(ctx, doer, owner)
+	repo, err := repo_model.GetRepositoryByOwnerAndName(ctx, owner.Name, IndexRepositoryName)
 	if err != nil {
-		return err
+		return fmt.Errorf("GetRepositoryByOwnerAndName: %w", err)
 	}
 
 	ps, err := packages_model.GetPackagesByType(ctx, owner.ID, packages_model.TypeCargo)

templates/package/shared/cargo.tmpl

@@ -3,13 +3,7 @@
 </h4>
 <div class="ui attached segment">
 	<div class="ui form">
-		<div class="field">
+		{{if .CargoIndexExists}}
-			<label>{{ctx.Locale.Tr "packages.owner.settings.cargo.initialize.description"}}</label>
-		</div>
-		<form class="field" action="{{.Link}}/cargo/initialize" method="post">
-			{{.CsrfTokenHtml}}
-			<button class="ui primary button">{{ctx.Locale.Tr "packages.owner.settings.cargo.initialize"}}</button>
-		</form>
 		<div class="field">
 			<label>{{ctx.Locale.Tr "packages.owner.settings.cargo.rebuild.description"}}</label>
 		</div>
@@ -17,6 +11,15 @@
 			{{.CsrfTokenHtml}}
 			<button class="ui primary button">{{ctx.Locale.Tr "packages.owner.settings.cargo.rebuild"}}</button>
 		</form>
+		{{else}}
+		<div class="field">
+			<label>{{ctx.Locale.Tr "packages.owner.settings.cargo.initialize.description"}}</label>
+		</div>
+		<form class="field" action="{{.Link}}/cargo/initialize" method="post">
+			{{.CsrfTokenHtml}}
+			<button class="ui primary button">{{ctx.Locale.Tr "packages.owner.settings.cargo.initialize"}}</button>
+		</form>
+		{{end}}
 		<div class="field">
 			<label>{{ctx.Locale.Tr "packages.registry.documentation" "Cargo" "https://forgejo.org/docs/latest/user/packages/cargo/"}}</label>
 		</div>

tests/integration/api_packages_cargo_test.go

@@ -23,6 +23,7 @@ import (
 	cargo_module "code.gitea.io/gitea/modules/packages/cargo"
 	"code.gitea.io/gitea/modules/setting"
 	cargo_router "code.gitea.io/gitea/routers/api/packages/cargo"
+	gitea_context "code.gitea.io/gitea/services/context"
 	cargo_service "code.gitea.io/gitea/services/packages/cargo"
 	"code.gitea.io/gitea/tests"
 
@@ -385,3 +386,62 @@ func testPackageCargo(t *testing.T, _ *neturl.URL) {
 		assert.Equal(t, user.DisplayName(), owners.Users[0].Name)
 	})
 }
+
+func TestRebuildCargo(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *neturl.URL) {
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+		session := loginUser(t, user.Name)
+		unittest.AssertExistsIf(t, false, &repo_model.Repository{OwnerID: user.ID, Name: cargo_service.IndexRepositoryName})
+
+		t.Run("No index", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			req := NewRequestWithValues(t, "POST", "/user/settings/packages/cargo/rebuild", map[string]string{
+				"_csrf": GetCSRF(t, session, "/user/settings/packages"),
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+
+			flashCookie := session.GetCookie(gitea_context.CookieNameFlash)
+			assert.NotNil(t, flashCookie)
+			assert.EqualValues(t, "error%3DCannot%2Brebuild%252C%2Bno%2Bindex%2Bis%2Binitialized.", flashCookie.Value)
+			unittest.AssertExistsIf(t, false, &repo_model.Repository{OwnerID: user.ID, Name: cargo_service.IndexRepositoryName})
+		})
+
+		t.Run("Initialize Cargo", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			req := NewRequest(t, "GET", "/user/settings/packages")
+			resp := session.MakeRequest(t, req, http.StatusOK)
+			htmlDoc := NewHTMLParser(t, resp.Body)
+
+			htmlDoc.AssertElement(t, `form[action="/user/settings/packages/cargo/rebuild"]`, false)
+			htmlDoc.AssertElement(t, `form[action="/user/settings/packages/cargo/initialize"]`, true)
+
+			req = NewRequestWithValues(t, "POST", "/user/settings/packages/cargo/initialize", map[string]string{
+				"_csrf": htmlDoc.GetCSRF(),
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+			unittest.AssertExistsIf(t, true, &repo_model.Repository{OwnerID: user.ID, Name: cargo_service.IndexRepositoryName})
+
+			req = NewRequest(t, "GET", "/user/settings/packages")
+			resp = session.MakeRequest(t, req, http.StatusOK)
+			htmlDoc = NewHTMLParser(t, resp.Body)
+
+			htmlDoc.AssertElement(t, `form[action="/user/settings/packages/cargo/rebuild"]`, true)
+			htmlDoc.AssertElement(t, `form[action="/user/settings/packages/cargo/initialize"]`, false)
+		})
+
+		t.Run("With index", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			req := NewRequestWithValues(t, "POST", "/user/settings/packages/cargo/rebuild", map[string]string{
+				"_csrf": GetCSRF(t, session, "/user/settings/packages"),
+			})
+			session.MakeRequest(t, req, http.StatusSeeOther)
+
+			flashCookie := session.GetCookie(gitea_context.CookieNameFlash)
+			assert.NotNil(t, flashCookie)
+			assert.EqualValues(t, "success%3DThe%2BCargo%2Bindex%2Bwas%2Bsuccessfully%2Brebuild.", flashCookie.Value)
+		})
+	})
+}