[GITEA] Avoid conflicts of issue and PR numbers in GitLab migration (#1790)

Closes #1789.

The bug was due to the fact that GitLab does not guarantee that issue numbers are created sequentially: some identifiers can be skipped. Therefore, the new pull requests numbers should not be offset by the number of issues, but by the maximum issue number.

See for instance https://gitlab.com/troyengel/archbuild/-/issues/?sort=created_date&state=all&first_page_size=20, where there is only a singe issue with number "2".

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/1790
Co-authored-by: Antonin Delpeuch <antonin@delpeuch.eu>
Co-committed-by: Antonin Delpeuch <antonin@delpeuch.eu>
(cherry picked from commit 2c185c39fe)
(cherry picked from commit 8f68dc4c9c)
(cherry picked from commit 7e932b7fca)

services/migrations/gitlab.go

@@ -57,17 +57,18 @@ func (f *GitlabDownloaderFactory) GitServiceType() structs.GitServiceType {
 
 // GitlabDownloader implements a Downloader interface to get repository information
 // from gitlab via go-gitlab
-// - issueCount is incremented in GetIssues() to ensure PR and Issue numbers do not overlap,
+// - maxIssueNumber is the maximum issue number seen, updated in GetIssues() to ensure PR and Issue numbers do not overlap,
 // because Gitlab has individual Issue and Pull Request numbers.
+// Note that because some issue numbers may be skipped, this number may be greater than the total number of issues
 type GitlabDownloader struct {
 	base.NullDownloader
-	ctx        context.Context
+	ctx            context.Context
-	client     *gitlab.Client
+	client         *gitlab.Client
-	baseURL    string
+	baseURL        string
-	repoID     int
+	repoID         int
-	repoName   string
+	repoName       string
-	issueCount int64
+	maxIssueNumber int64
-	maxPerPage int
+	maxPerPage     int
 }
 
 // NewGitlabDownloader creates a gitlab Downloader via gitlab API
@@ -450,8 +451,8 @@ func (g *GitlabDownloader) GetIssues(page, perPage int) ([]*base.Issue, bool, er
 			Context:      gitlabIssueContext{IsMergeRequest: false},
 		})
 
-		// increment issueCount, to be used in GetPullRequests()
+		// update maxIssueNumber, to be used in GetPullRequests()
-		g.issueCount++
+		g.maxIssueNumber = max(g.maxIssueNumber, int64(issue.IID))
 	}
 
 	return allIssues, len(issues) < perPage, nil
@@ -608,7 +609,7 @@ func (g *GitlabDownloader) GetPullRequests(page, perPage int) ([]*base.PullReque
 		}
 
 		// Add the PR ID to the Issue Count because PR and Issues share ID space in Gitea
-		newPRNumber := g.issueCount + int64(pr.IID)
+		newPRNumber := g.maxIssueNumber + int64(pr.IID)
 
 		allPRs = append(allPRs, &base.PullRequest{
 			Title:          pr.Title,

services/migrations/gitlab_test.go

@@ -334,6 +334,49 @@ func TestGitlabDownloadRepo(t *testing.T) {
 	}, rvs)
 }
 
+func TestGitlabSkippedIssueNumber(t *testing.T) {
+	// If a GitLab access token is provided, this test will make HTTP requests to the live gitlab.com instance.
+	// When doing so, the responses from gitlab.com will be saved as test data files.
+	// If no access token is available, those cached responses will be used instead.
+	gitlabPersonalAccessToken := os.Getenv("GITLAB_READ_TOKEN")
+	fixturePath := "./testdata/gitlab/skipped_issue_number"
+	server := unittest.NewMockWebServer(t, "https://gitlab.com", fixturePath, gitlabPersonalAccessToken != "")
+	defer server.Close()
+
+	downloader, err := NewGitlabDownloader(context.Background(), server.URL, "troyengel/archbuild", "", "", gitlabPersonalAccessToken)
+	if err != nil {
+		t.Fatalf("NewGitlabDownloader is nil: %v", err)
+	}
+	repo, err := downloader.GetRepoInfo()
+	assert.NoError(t, err)
+	assertRepositoryEqual(t, &base.Repository{
+		Name:          "archbuild",
+		Owner:         "troyengel",
+		Description:   "Arch packaging and build files",
+		CloneURL:      server.URL + "/troyengel/archbuild.git",
+		OriginalURL:   server.URL + "/troyengel/archbuild",
+		DefaultBranch: "master",
+	}, repo)
+
+	issues, isEnd, err := downloader.GetIssues(1, 10)
+	assert.NoError(t, err)
+	assert.True(t, isEnd)
+
+	// the only issue in this repository has number 2
+	assert.EqualValues(t, 1, len(issues))
+	assert.EqualValues(t, 2, issues[0].Number)
+	assert.EqualValues(t, "vpn unlimited errors", issues[0].Title)
+
+	prs, _, err := downloader.GetPullRequests(1, 10)
+	assert.NoError(t, err)
+	// the only merge request in this repository has number 1,
+	// but we offset it by the maximum issue number so it becomes
+	// pull request 3 in Forgejo
+	assert.EqualValues(t, 1, len(prs))
+	assert.EqualValues(t, 3, prs[0].Number)
+	assert.EqualValues(t, "Review", prs[0].Title)
+}
+
 func gitlabClientMockSetup(t *testing.T) (*http.ServeMux, *httptest.Server, *gitlab.Client) {
 	// mux is the HTTP request multiplexer used with the test server.
 	mux := http.NewServeMux()

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