Merge branch '29541-fix-github-importer-deleted-fork' into 'master'

Fix GitHub importer for PRs of deleted forked repositories

Closes #29541

See merge request !9992

2 files changed, 39 insertions, 12 deletions

diff --git a/spec/lib/gitlab/github_import/importer_spec.rb b/spec/lib/gitlab/github_import/importer_spec.rb
index 8b867fbe322..9d5e20841b5 100644
--- a/spec/lib/gitlab/github_import/importer_spec.rb
+++ b/spec/lib/gitlab/github_import/importer_spec.rb
@@ -215,9 +215,9 @@ describe Gitlab::GithubImport::Importer, lib: true do
   let(:updated_at) { DateTime.strptime('2011-01-27T19:01:12Z') }
   let(:repository) { double(id: 1, fork: false) }
   let(:source_sha) { create(:commit, project: project).id }
-  let(:source_branch) { double(ref: 'branch-merged', repo: repository, sha: source_sha) }
+  let(:source_branch) { double(ref: 'branch-merged', repo: repository, sha: source_sha, user: octocat) }
   let(:target_sha) { create(:commit, project: project, git_commit: RepoHelpers.another_sample_commit).id }
-  let(:target_branch) { double(ref: 'master', repo: repository, sha: target_sha) }
+  let(:target_branch) { double(ref: 'master', repo: repository, sha: target_sha, user: octocat) }
   let(:pull_request) do
     double(
       number: 1347,
diff --git a/spec/lib/gitlab/github_import/pull_request_formatter_spec.rb b/spec/lib/gitlab/github_import/pull_request_formatter_spec.rb
index 44423917944..9b9f7e4d34e 100644
--- a/spec/lib/gitlab/github_import/pull_request_formatter_spec.rb
+++ b/spec/lib/gitlab/github_import/pull_request_formatter_spec.rb
@@ -4,15 +4,18 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
   let(:client) { double }
   let(:project) { create(:project, :repository) }
   let(:source_sha) { create(:commit, project: project).id }
-  let(:target_sha) { create(:commit, project: project, git_commit: RepoHelpers.another_sample_commit).id }
+  let(:target_commit) { create(:commit, project: project, git_commit: RepoHelpers.another_sample_commit) }
+  let(:target_sha) { target_commit.id }
+  let(:target_short_sha) { target_commit.id.to_s[0..7] }
   let(:repository) { double(id: 1, fork: false) }
   let(:source_repo) { repository }
   let(:source_branch) { double(ref: 'branch-merged', repo: source_repo, sha: source_sha) }
   let(:forked_source_repo) { double(id: 2, fork: true, name: 'otherproject', full_name: 'company/otherproject') }
   let(:target_repo) { repository }
-  let(:target_branch) { double(ref: 'master', repo: target_repo, sha: target_sha) }
-  let(:removed_branch) { double(ref: 'removed-branch', repo: source_repo, sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b') }
-  let(:forked_branch) { double(ref: 'master', repo: forked_source_repo, sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b') }
+  let(:target_branch) { double(ref: 'master', repo: target_repo, sha: target_sha, user: octocat) }
+  let(:removed_branch) { double(ref: 'removed-branch', repo: source_repo, sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b', user: octocat) }
+  let(:forked_branch) { double(ref: 'master', repo: forked_source_repo, sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b', user: octocat) }
+  let(:branch_deleted_repo) { double(ref: 'master', repo: nil, sha: '2e5d3239642f9161dcbbc4b70a211a68e5e45e2b', user: octocat) }
   let(:octocat) { double(id: 123456, login: 'octocat', email: 'octocat@example.com') }
   let(:created_at) { DateTime.strptime('2011-01-26T19:01:12Z') }
   let(:updated_at) { DateTime.strptime('2011-01-27T19:01:12Z') }
@@ -203,16 +206,24 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
     context 'when source branch does not exist' do
       let(:raw_data) { double(base_data.merge(head: removed_branch)) }
 
-      it 'prefixes branch name with pull request number' do
-        expect(pull_request.source_branch_name).to eq 'pull/1347/removed-branch'
+      it 'prefixes branch name with gh-:short_sha/:number/:user pattern to avoid collision' do
+        expect(pull_request.source_branch_name).to eq "gh-#{target_short_sha}/1347/octocat/removed-branch"
       end
     end
 
     context 'when source branch is from a fork' do
       let(:raw_data) { double(base_data.merge(head: forked_branch)) }
 
-      it 'prefixes branch name with pull request number and project with namespace to avoid collision' do
-        expect(pull_request.source_branch_name).to eq 'pull/1347/company/otherproject/master'
+      it 'prefixes branch name with gh-:short_sha/:number/:user pattern to avoid collision' do
+        expect(pull_request.source_branch_name).to eq "gh-#{target_short_sha}/1347/octocat/master"
+      end
+    end
+
+    context 'when source branch is from a deleted fork' do
+      let(:raw_data) { double(base_data.merge(head: branch_deleted_repo)) }
+
+      it 'prefixes branch name with gh-:short_sha/:number/:user pattern to avoid collision' do
+        expect(pull_request.source_branch_name).to eq "gh-#{target_short_sha}/1347/octocat/master"
       end
     end
   end
@@ -229,8 +240,8 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
     context 'when target branch does not exist' do
       let(:raw_data) { double(base_data.merge(base: removed_branch)) }
 
-      it 'prefixes branch name with pull request number' do
-        expect(pull_request.target_branch_name).to eq 'pull/1347/removed-branch'
+      it 'prefixes branch name with gh-:short_sha/:number/:user pattern to avoid collision' do
+        expect(pull_request.target_branch_name).to eq 'gl-2e5d3239/1347/octocat/removed-branch'
       end
     end
   end
@@ -290,6 +301,14 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
       end
     end
 
+    context 'when source repository does not exist anymore' do
+      let(:raw_data) { double(base_data.merge(head: branch_deleted_repo)) }
+
+      it 'returns true' do
+        expect(pull_request.cross_project?).to eq true
+      end
+    end
+
     context 'when source and target repositories are the same' do
       let(:raw_data) { double(base_data.merge(head: source_branch)) }
 
@@ -299,6 +318,14 @@ describe Gitlab::GithubImport::PullRequestFormatter, lib: true do
     end
   end
 
+  describe '#source_branch_exists?' do
+    let(:raw_data) { double(base_data.merge(head: forked_branch)) }
+
+    it 'returns false when is a cross_project' do
+      expect(pull_request.source_branch_exists?).to eq false
+    end
+  end
+
   describe '#url' do
     let(:raw_data) { double(base_data) }