Fix code owners will not be mentioned when a pull request comes from a forked repository (#30476) (#30497)

Backport #30476 
Fix #30277
Caused by #29783

services/issue/pull.go

@@ -50,14 +50,14 @@ func PullRequestCodeOwnersReview(ctx context.Context, issue *issues_model.Issue,
 		return nil, err
 	}
 
-	if pr.HeadRepo.IsFork {
-		return nil, nil
-	}
-
 	if err := pr.LoadBaseRepo(ctx); err != nil {
 		return nil, err
 	}
 
+	if pr.BaseRepo.IsFork {
+		return nil, nil
+	}
+
 	repo, err := git.OpenRepository(ctx, pr.BaseRepo.RepoPath())
 	if err != nil {
 		return nil, err

tests/integration/pull_create_test.go

@@ -62,6 +62,30 @@ func testPullCreate(t *testing.T, session *TestSession, user, repo, branch, titl
 	return resp
 }
 
+func testPullCreateDirectly(t *testing.T, session *TestSession, baseRepoOwner, baseRepoName, baseBranch, headRepoOwner, headRepoName, headBranch, title string) *httptest.ResponseRecorder {
+	headCompare := headBranch
+	if headRepoOwner != "" {
+		if headRepoName != "" {
+			headCompare = fmt.Sprintf("%s/%s:%s", headRepoOwner, headRepoName, headBranch)
+		} else {
+			headCompare = fmt.Sprintf("%s:%s", headRepoOwner, headBranch)
+		}
+	}
+	req := NewRequest(t, "GET", fmt.Sprintf("/%s/%s/compare/%s...%s", baseRepoOwner, baseRepoName, baseBranch, headCompare))
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	// Submit the form for creating the pull
+	htmlDoc := NewHTMLParser(t, resp.Body)
+	link, exists := htmlDoc.doc.Find("form.ui.form").Attr("action")
+	assert.True(t, exists, "The template has changed")
+	req = NewRequestWithValues(t, "POST", link, map[string]string{
+		"_csrf": htmlDoc.GetCSRF(),
+		"title": title,
+	})
+	resp = session.MakeRequest(t, req, http.StatusOK)
+	return resp
+}
+
 func TestPullCreate(t *testing.T) {
 	onGiteaRun(t, func(t *testing.T, u *url.URL) {
 		session := loginUser(t, "user1")

tests/integration/pull_review_test.go

@@ -159,10 +159,18 @@ func TestPullView_CodeOwner(t *testing.T) {
 			assert.NoError(t, err)
 
 			session := loginUser(t, "user5")
-			createPullRequest(t, session, "user5", "test_codeowner", forkedRepo.DefaultBranch, "codeowner-basebranch-forked", "Test Pull Request2")
+
+			// create a pull request on the forked repository, code reviewers should not be mentioned
+			testPullCreateDirectly(t, session, "user5", "test_codeowner", forkedRepo.DefaultBranch, "", "", "codeowner-basebranch-forked", "Test Pull Request on Forked Repository")
 
 			pr := unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{BaseRepoID: forkedRepo.ID, HeadBranch: "codeowner-basebranch-forked"})
 			unittest.AssertExistsIf(t, false, &issues_model.Review{IssueID: pr.IssueID, Type: issues_model.ReviewTypeRequest, ReviewerID: 8})
+
+			// create a pull request to base repository, code reviewers should be mentioned
+			testPullCreateDirectly(t, session, repo.OwnerName, repo.Name, repo.DefaultBranch, forkedRepo.OwnerName, forkedRepo.Name, "codeowner-basebranch-forked", "Test Pull Request3")
+
+			pr = unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{BaseRepoID: repo.ID, HeadRepoID: forkedRepo.ID, HeadBranch: "codeowner-basebranch-forked"})
+			unittest.AssertExistsIf(t, true, &issues_model.Review{IssueID: pr.IssueID, Type: issues_model.ReviewTypeRequest, ReviewerID: 8})
 		})
 	})
 }