896c0bdbfb
When a project is forked, the new repository used to be a deep copy of everything stored on disk by leveraging `git clone`. This works well, and makes isolation between repository easy. However, the clone is at the start 100% the same as the origin repository. And in the case of the objects in the object directory, this is almost always going to be a lot of duplication. Object Pools are a way to create a third repository that essentially only exists for its 'objects' subdirectory. This third repository's object directory will be set as alternate location for objects. This means that in the case an object is missing in the local repository, git will look in another location. This other location is the object pool repository. When Git performs garbage collection, it's smart enough to check the alternate location. When objects are duplicated, it will allow git to throw one copy away. This copy is on the local repository, where to pool remains as is. These pools have an origin location, which for now will always be a repository that itself is not a fork. When the root of a fork network is forked by a user, the fork still clones the full repository. Async, the pool repository will be created. Either one of these processes can be done earlier than the other. To handle this race condition, the Join ObjectPool operation is idempotent. Given its idempotent, we can schedule it twice, with the same effect. To accommodate the holding of state two migrations have been added. 1. Added a state column to the pool_repositories column. This column is managed by the state machine, allowing for hooks on transitions. 2. pool_repositories now has a source_project_id. This column in convenient to have for multiple reasons: it has a unique index allowing the database to handle race conditions when creating a new record. Also, it's nice to know who the host is. As that's a short link to the fork networks root. Object pools are only available for public project, which use hashed storage and when forking from the root of the fork network. (That is, the project being forked from itself isn't a fork) In this commit message I use both ObjectPool and Pool repositories, which are alike, but different from each other. ObjectPool refers to whatever is on the disk stored and managed by Gitaly. PoolRepository is the record in the database.
328 lines
12 KiB
Ruby
328 lines
12 KiB
Ruby
require 'spec_helper'
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describe Projects::ForkService do
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include ProjectForksHelper
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include Gitlab::ShellAdapter
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context 'when forking a new project' do
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describe 'fork by user' do
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before do
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@from_user = create(:user)
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@from_namespace = @from_user.namespace
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avatar = fixture_file_upload("spec/fixtures/dk.png", "image/png")
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@from_project = create(:project,
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:repository,
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creator_id: @from_user.id,
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namespace: @from_namespace,
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star_count: 107,
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avatar: avatar,
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description: 'wow such project')
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@to_user = create(:user)
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@to_namespace = @to_user.namespace
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@from_project.add_user(@to_user, :developer)
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end
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context 'fork project' do
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context 'when forker is a guest' do
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before do
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@guest = create(:user)
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@from_project.add_user(@guest, :guest)
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end
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subject { fork_project(@from_project, @guest) }
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it { is_expected.not_to be_persisted }
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it { expect(subject.errors[:forked_from_project_id]).to eq(['is forbidden']) }
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it 'does not create a fork network' do
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expect { subject }.not_to change { @from_project.reload.fork_network }
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end
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end
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describe "successfully creates project in the user namespace" do
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let(:to_project) { fork_project(@from_project, @to_user, namespace: @to_user.namespace) }
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it { expect(to_project).to be_persisted }
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it { expect(to_project.errors).to be_empty }
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it { expect(to_project.owner).to eq(@to_user) }
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it { expect(to_project.namespace).to eq(@to_user.namespace) }
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it { expect(to_project.star_count).to be_zero }
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it { expect(to_project.description).to eq(@from_project.description) }
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it { expect(to_project.avatar.file).to be_exists }
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# This test is here because we had a bug where the from-project lost its
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# avatar after being forked.
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# https://gitlab.com/gitlab-org/gitlab-ce/issues/26158
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it "after forking the from-project still has its avatar" do
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# If we do not fork the project first we cannot detect the bug.
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expect(to_project).to be_persisted
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expect(@from_project.avatar.file).to be_exists
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end
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it 'flushes the forks count cache of the source project' do
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expect(@from_project.forks_count).to be_zero
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fork_project(@from_project, @to_user)
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expect(@from_project.forks_count).to eq(1)
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end
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it 'creates a fork network with the new project and the root project set' do
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to_project
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fork_network = @from_project.reload.fork_network
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expect(fork_network).not_to be_nil
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expect(fork_network.root_project).to eq(@from_project)
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expect(fork_network.projects).to contain_exactly(@from_project, to_project)
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end
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it 'imports the repository of the forked project' do
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to_project = fork_project(@from_project, @to_user, repository: true)
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expect(to_project.empty_repo?).to be_falsy
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end
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end
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context 'creating a fork of a fork' do
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let(:from_forked_project) { fork_project(@from_project, @to_user) }
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let(:other_namespace) do
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group = create(:group)
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group.add_owner(@to_user)
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group
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end
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let(:to_project) { fork_project(from_forked_project, @to_user, namespace: other_namespace) }
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it 'sets the root of the network to the root project' do
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expect(to_project.fork_network.root_project).to eq(@from_project)
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end
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it 'sets the forked_from_project on the membership' do
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expect(to_project.fork_network_member.forked_from_project).to eq(from_forked_project)
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end
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end
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end
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context 'project already exists' do
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it "fails due to validation, not transaction failure" do
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@existing_project = create(:project, :repository, creator_id: @to_user.id, name: @from_project.name, namespace: @to_namespace)
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@to_project = fork_project(@from_project, @to_user, namespace: @to_namespace)
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expect(@existing_project).to be_persisted
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expect(@to_project).not_to be_persisted
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expect(@to_project.errors[:name]).to eq(['has already been taken'])
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expect(@to_project.errors[:path]).to eq(['has already been taken'])
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end
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end
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context 'repository already exists' do
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let(:repository_storage) { 'default' }
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let(:repository_storage_path) { Gitlab.config.repositories.storages[repository_storage].legacy_disk_path }
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before do
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gitlab_shell.create_repository(repository_storage, "#{@to_user.namespace.full_path}/#{@from_project.path}")
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end
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after do
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gitlab_shell.remove_repository(repository_storage, "#{@to_user.namespace.full_path}/#{@from_project.path}")
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end
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it 'does not allow creation' do
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to_project = fork_project(@from_project, @to_user, namespace: @to_user.namespace)
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expect(to_project).not_to be_persisted
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expect(to_project.errors.messages).to have_key(:base)
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expect(to_project.errors.messages[:base].first).to match('There is already a repository with that name on disk')
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end
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end
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context 'GitLab CI is enabled' do
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it "forks and enables CI for fork" do
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@from_project.enable_ci
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@to_project = fork_project(@from_project, @to_user)
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expect(@to_project.builds_enabled?).to be_truthy
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end
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end
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context "when project has restricted visibility level" do
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context "and only one visibility level is restricted" do
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before do
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@from_project.update(visibility_level: Gitlab::VisibilityLevel::INTERNAL)
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stub_application_setting(restricted_visibility_levels: [Gitlab::VisibilityLevel::INTERNAL])
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end
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it "creates fork with lowest level" do
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forked_project = fork_project(@from_project, @to_user)
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expect(forked_project.visibility_level).to eq(Gitlab::VisibilityLevel::PRIVATE)
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end
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end
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context "and all visibility levels are restricted" do
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before do
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stub_application_setting(restricted_visibility_levels: [Gitlab::VisibilityLevel::PUBLIC, Gitlab::VisibilityLevel::INTERNAL, Gitlab::VisibilityLevel::PRIVATE])
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end
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it "creates fork with private visibility levels" do
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forked_project = fork_project(@from_project, @to_user)
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expect(forked_project.visibility_level).to eq(Gitlab::VisibilityLevel::PRIVATE)
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end
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end
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end
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end
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describe 'fork to namespace' do
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before do
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@group_owner = create(:user)
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@developer = create(:user)
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@project = create(:project, :repository,
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creator_id: @group_owner.id,
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star_count: 777,
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description: 'Wow, such a cool project!')
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@group = create(:group)
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@group.add_user(@group_owner, GroupMember::OWNER)
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@group.add_user(@developer, GroupMember::DEVELOPER)
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@project.add_user(@developer, :developer)
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@project.add_user(@group_owner, :developer)
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@opts = { namespace: @group }
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end
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context 'fork project for group' do
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it 'group owner successfully forks project into the group' do
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to_project = fork_project(@project, @group_owner, @opts)
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expect(to_project).to be_persisted
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expect(to_project.errors).to be_empty
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expect(to_project.owner).to eq(@group)
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expect(to_project.namespace).to eq(@group)
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expect(to_project.name).to eq(@project.name)
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expect(to_project.path).to eq(@project.path)
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expect(to_project.description).to eq(@project.description)
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expect(to_project.star_count).to be_zero
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end
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end
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context 'fork project for group when user not owner' do
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it 'group developer fails to fork project into the group' do
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to_project = fork_project(@project, @developer, @opts)
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expect(to_project.errors[:namespace]).to eq(['is not valid'])
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end
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end
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context 'project already exists in group' do
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it 'fails due to validation, not transaction failure' do
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existing_project = create(:project, :repository,
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name: @project.name,
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namespace: @group)
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to_project = fork_project(@project, @group_owner, @opts)
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expect(existing_project.persisted?).to be_truthy
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expect(to_project.errors[:name]).to eq(['has already been taken'])
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expect(to_project.errors[:path]).to eq(['has already been taken'])
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end
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end
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context 'when the namespace has a lower visibility level than the project' do
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it 'creates the project with the lower visibility level' do
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public_project = create(:project, :public)
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private_group = create(:group, :private)
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group_owner = create(:user)
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private_group.add_owner(group_owner)
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forked_project = fork_project(public_project, group_owner, namespace: private_group)
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expect(forked_project.visibility_level).to eq(Gitlab::VisibilityLevel::PRIVATE)
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end
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end
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end
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end
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context 'when forking with object pools' do
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let(:fork_from_project) { create(:project, :public) }
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let(:forker) { create(:user) }
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before do
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stub_feature_flags(object_pools: true)
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end
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context 'when no pool exists' do
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it 'creates a new object pool' do
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forked_project = fork_project(fork_from_project, forker)
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expect(forked_project.pool_repository).to eq(fork_from_project.pool_repository)
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end
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end
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context 'when a pool already exists' do
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let!(:pool_repository) { create(:pool_repository, source_project: fork_from_project) }
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it 'joins the object pool' do
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forked_project = fork_project(fork_from_project, forker)
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expect(forked_project.pool_repository).to eq(fork_from_project.pool_repository)
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end
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end
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end
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context 'when linking fork to an existing project' do
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let(:fork_from_project) { create(:project, :public) }
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let(:fork_to_project) { create(:project, :public) }
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let(:user) { create(:user) }
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subject { described_class.new(fork_from_project, user) }
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def forked_from_project(project)
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project.fork_network_member&.forked_from_project
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end
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context 'if project is already forked' do
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it 'does not create fork relation' do
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allow(fork_to_project).to receive(:forked?).and_return(true)
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expect(forked_from_project(fork_to_project)).to be_nil
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expect(subject.execute(fork_to_project)).to be_nil
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expect(forked_from_project(fork_to_project)).to be_nil
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end
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end
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context 'if project is not forked' do
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it 'creates fork relation' do
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expect(fork_to_project.forked?).to be_falsy
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expect(forked_from_project(fork_to_project)).to be_nil
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subject.execute(fork_to_project)
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fork_to_project.reload
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expect(fork_to_project.forked?).to be true
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expect(forked_from_project(fork_to_project)).to eq fork_from_project
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expect(fork_to_project.forked_from_project).to eq fork_from_project
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end
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it 'flushes the forks count cache of the source project' do
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expect(fork_from_project.forks_count).to be_zero
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subject.execute(fork_to_project)
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expect(fork_from_project.forks_count).to eq(1)
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end
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it 'leaves no LFS objects dangling' do
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create(:lfs_objects_project, project: fork_to_project)
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expect { subject.execute(fork_to_project) }
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.to change { fork_to_project.lfs_objects_projects.count }
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.to(0)
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end
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context 'if the fork is not allowed' do
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let(:fork_from_project) { create(:project, :private) }
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it 'does not delete the LFS objects' do
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create(:lfs_objects_project, project: fork_to_project)
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expect { subject.execute(fork_to_project) }
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.not_to change { fork_to_project.lfs_objects_projects.size }
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end
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end
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end
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end
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end
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