Commit 3c6a4d63 authored by Sean McGivern's avatar Sean McGivern

Ensure MRs always use branch refs for comparison

If a merge request was created with a branch name that also matched a tag name,
we'd generate a comparison to or from the tag respectively, rather than the
branch. Merging would still use the branch, of course.

To avoid this, ensure that when we get the branch heads, we prepend the
reference prefix for branches, which will ensure that we generate the correct
comparison.
parent 7c1e54d5
......@@ -65,7 +65,7 @@ class Projects::MergeRequests::CreationsController < Projects::MergeRequests::Ap
if params[:ref].present?
@ref = params[:ref]
@commit = @repository.commit("refs/heads/#{@ref}")
@commit = @repository.commit(Gitlab::Git::BRANCH_REF_PREFIX + @ref)
end
render layout: false
......@@ -76,7 +76,7 @@ class Projects::MergeRequests::CreationsController < Projects::MergeRequests::Ap
if params[:ref].present?
@ref = params[:ref]
@commit = @target_project.commit("refs/heads/#{@ref}")
@commit = @target_project.commit(Gitlab::Git::BRANCH_REF_PREFIX + @ref)
end
render layout: false
......
......@@ -365,16 +365,28 @@ class MergeRequest < ActiveRecord::Base
# We use these attributes to force these to the intended values.
attr_writer :target_branch_sha, :source_branch_sha
def source_branch_ref
return @source_branch_sha if @source_branch_sha
return unless source_branch
Gitlab::Git::BRANCH_REF_PREFIX + source_branch
end
def target_branch_ref
return @target_branch_sha if @target_branch_sha
return unless target_branch
Gitlab::Git::BRANCH_REF_PREFIX + target_branch
end
def source_branch_head
return unless source_project
source_branch_ref = @source_branch_sha || source_branch
source_project.repository.commit(source_branch_ref) if source_branch_ref
end
def target_branch_head
target_branch_ref = @target_branch_sha || target_branch
target_project.repository.commit(target_branch_ref) if target_branch_ref
target_project.repository.commit(target_branch_ref)
end
def branch_merge_base_commit
......
require 'securerandom'
# Compare 2 branches for one repo or between repositories
# Compare 2 refs for one repo or between repositories
# and return Gitlab::Git::Compare object that responds to commits and diffs
class CompareService
attr_reader :start_project, :start_branch_name
attr_reader :start_project, :start_ref_name
def initialize(new_start_project, new_start_branch_name)
def initialize(new_start_project, new_start_ref_name)
@start_project = new_start_project
@start_branch_name = new_start_branch_name
@start_ref_name = new_start_ref_name
end
def execute(target_project, target_branch, straight: false)
raw_compare = target_project.repository.compare_source_branch(target_branch, start_project.repository, start_branch_name, straight: straight)
def execute(target_project, target_ref, straight: false)
raw_compare = target_project.repository.compare_source_branch(target_ref, start_project.repository, start_ref_name, straight: straight)
Compare.new(raw_compare, target_project, straight: straight) if raw_compare
end
......
......@@ -18,7 +18,17 @@ module MergeRequests
attr_accessor :merge_request
delegate :target_branch, :source_branch, :source_project, :target_project, :compare_commits, :wip_title, :description, :errors, to: :merge_request
delegate :target_branch,
:target_branch_ref,
:target_project,
:source_branch,
:source_branch_ref,
:source_project,
:compare_commits,
:wip_title,
:description,
:errors,
to: :merge_request
def find_source_project
return source_project if source_project.present? && can?(current_user, :read_project, source_project)
......@@ -54,10 +64,10 @@ module MergeRequests
def compare_branches
compare = CompareService.new(
source_project,
source_branch
source_branch_ref
).execute(
target_project,
target_branch
target_branch_ref
)
if compare
......
---
title: Fix merge requests where the source or target branch name matches a tag name
merge_request: 15591
author:
type: fixed
......@@ -1046,9 +1046,15 @@ module Gitlab
end
def with_repo_tmp_commit(start_repository, start_branch_name, sha)
source_ref = start_branch_name
unless Gitlab::Git.branch_ref?(source_ref)
source_ref = "#{Gitlab::Git::BRANCH_REF_PREFIX}#{source_ref}"
end
tmp_ref = fetch_ref(
start_repository,
source_ref: "#{Gitlab::Git::BRANCH_REF_PREFIX}#{start_branch_name}",
source_ref: source_ref,
target_ref: "refs/tmp/#{SecureRandom.hex}"
)
......
......@@ -1771,9 +1771,9 @@ describe Gitlab::Diff::PositionTracer do
describe "merge of target branch" do
let(:merge_commit) do
update_file_again_commit
second_create_file_commit
merge_request = create(:merge_request, source_branch: second_create_file_commit.sha, target_branch: branch_name, source_project: project)
merge_request = create(:merge_request, source_branch: second_branch_name, target_branch: branch_name, source_project: project)
repository.merge(current_user, merge_request.diff_head_sha, merge_request, "Merge branches")
......
......@@ -259,7 +259,7 @@ describe MergeRequest do
end
describe '#source_branch_sha' do
let(:last_branch_commit) { subject.source_project.repository.commit(subject.source_branch) }
let(:last_branch_commit) { subject.source_project.repository.commit(Gitlab::Git::BRANCH_REF_PREFIX + subject.source_branch) }
context 'with diffs' do
subject { create(:merge_request, :with_diffs) }
......@@ -273,6 +273,21 @@ describe MergeRequest do
it 'returns the sha of the source branch last commit' do
expect(subject.source_branch_sha).to eq(last_branch_commit.sha)
end
context 'when there is a tag name matching the branch name' do
let(:tag_name) { subject.source_branch }
it 'returns the sha of the source branch last commit' do
subject.source_project.repository.add_tag(subject.author,
tag_name,
subject.target_branch_sha,
'Add a tag')
expect(subject.source_branch_sha).to eq(last_branch_commit.sha)
subject.source_project.repository.rm_tag(subject.author, tag_name)
end
end
end
context 'when the merge request is being created' do
......@@ -933,7 +948,7 @@ describe MergeRequest do
context 'with a completely different branch' do
before do
subject.update(target_branch: 'v1.0.0')
subject.update(target_branch: 'csv')
end
it_behaves_like 'returning all SHA'
......@@ -941,7 +956,7 @@ describe MergeRequest do
context 'with a branch having no difference' do
before do
subject.update(target_branch: 'v1.1.0')
subject.update(target_branch: 'branch-merged')
subject.reload # make sure commits were not cached
end
......
......@@ -29,13 +29,27 @@ describe MergeRequests::BuildService do
before do
project.team << [user, :guest]
end
def stub_compare
allow(CompareService).to receive_message_chain(:new, :execute).and_return(compare)
allow(project).to receive(:commit).and_return(commit_1)
allow(project).to receive(:commit).and_return(commit_2)
end
describe 'execute' do
describe '#execute' do
it 'calls the compare service with the correct arguments' do
expect(CompareService).to receive(:new)
.with(project, Gitlab::Git::BRANCH_REF_PREFIX + source_branch)
.and_call_original
expect_any_instance_of(CompareService).to receive(:execute)
.with(project, Gitlab::Git::BRANCH_REF_PREFIX + target_branch)
.and_call_original
merge_request
end
context 'missing source branch' do
let(:source_branch) { '' }
......@@ -52,6 +66,10 @@ describe MergeRequests::BuildService do
let(:target_branch) { nil }
let(:commits) { Commit.decorate([commit_1], project) }
before do
stub_compare
end
it 'creates compare object with target branch as default branch' do
expect(merge_request.compare).to be_present
expect(merge_request.target_branch).to eq(project.default_branch)
......@@ -77,6 +95,10 @@ describe MergeRequests::BuildService do
context 'no commits in the diff' do
let(:commits) { [] }
before do
stub_compare
end
it 'allows the merge request to be created' do
expect(merge_request.can_be_created).to eq(true)
end
......@@ -89,6 +111,10 @@ describe MergeRequests::BuildService do
context 'one commit in the diff' do
let(:commits) { Commit.decorate([commit_1], project) }
before do
stub_compare
end
it 'allows the merge request to be created' do
expect(merge_request.can_be_created).to eq(true)
end
......@@ -149,6 +175,10 @@ describe MergeRequests::BuildService do
context 'more than one commit in the diff' do
let(:commits) { Commit.decorate([commit_1, commit_2], project) }
before do
stub_compare
end
it 'allows the merge request to be created' do
expect(merge_request.can_be_created).to eq(true)
end
......
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