Commit 976d373a authored by Oswaldo Ferreira's avatar Oswaldo Ferreira

Make use of local ref if it is reachable

parent 1ac4b24d
---
title: Don't create a temp reference for branch comparisons within project
merge_request:
merge_request: 24038
author:
type: fixed
......@@ -732,20 +732,27 @@ module Gitlab
end
def compare_source_branch(target_branch_name, source_repository, source_branch_name, straight:)
reachable_ref =
if source_repository == self
return Gitlab::Git::Compare.new(self, target_branch_name, source_branch_name, straight: straight)
source_branch_name
else
# If a tmp ref was created before for a separate repo comparison (forks),
# we're able to short-circuit the tmp ref re-creation:
# 1. Take the SHA from the source repo
# 2. Read that in the current "target" repo
# 3. If that SHA is still known (readable), it means GC hasn't
# cleaned it up yet, so we can use it instead re-writing the tmp ref.
source_commit_id = source_repository.commit(source_branch_name)&.sha
commit(source_commit_id)&.sha if source_commit_id
end
return compare(target_branch_name, reachable_ref, straight: straight) if reachable_ref
tmp_ref = "refs/tmp/#{SecureRandom.hex}"
return unless fetch_source_branch!(source_repository, source_branch_name, tmp_ref)
Gitlab::Git::Compare.new(
self,
target_branch_name,
tmp_ref,
straight: straight
)
compare(target_branch_name, tmp_ref, straight: straight)
ensure
delete_refs(tmp_ref) if tmp_ref
end
......@@ -1003,6 +1010,13 @@ module Gitlab
private
def compare(base_ref, head_ref, straight:)
Gitlab::Git::Compare.new(self,
base_ref,
head_ref,
straight: straight)
end
def empty_diff_stats
Gitlab::Git::DiffStatsCollection.new([])
end
......
......@@ -1967,6 +1967,8 @@ describe Gitlab::Git::Repository, :seed_helper do
end
describe '#compare_source_branch' do
let(:repository) { Gitlab::Git::Repository.new('default', TEST_GITATTRIBUTES_REPO_PATH, '', 'group/project') }
context 'within same repository' do
it 'does not create a temp ref' do
expect(repository).not_to receive(:fetch_source_branch!)
......@@ -1985,22 +1987,48 @@ describe Gitlab::Git::Repository, :seed_helper do
end
context 'with different repositories' do
it 'creates a temp ref' do
expect(repository).to receive(:fetch_source_branch!).and_call_original
expect(repository).to receive(:delete_refs).and_call_original
context 'when ref is known by source repo, but not by target' do
before do
mutable_repository.write_ref('another-branch', 'feature')
end
it 'creates temp ref' do
expect(repository).not_to receive(:fetch_source_branch!)
expect(repository).not_to receive(:delete_refs)
compare = repository.compare_source_branch('master', mutable_repository, 'feature', straight: false)
compare = repository.compare_source_branch('master', mutable_repository, 'another-branch', straight: false)
expect(compare).to be_a(Gitlab::Git::Compare)
expect(compare.commits.count).to be > 0
end
end
context 'when ref is known by source and target repos' do
before do
mutable_repository.write_ref('another-branch', 'feature')
repository.write_ref('another-branch', 'feature')
end
it 'does not create a temp ref' do
expect(repository).not_to receive(:fetch_source_branch!)
expect(repository).not_to receive(:delete_refs)
compare = repository.compare_source_branch('master', mutable_repository, 'another-branch', straight: false)
expect(compare).to be_a(Gitlab::Git::Compare)
expect(compare.commits.count).to be > 0
end
end
context 'when ref is unknown by source repo' do
it 'returns nil when source ref does not exist' do
compare = repository.compare_source_branch('master', mutable_repository, 'non-existent-branch', straight: false)
expect(repository).to receive(:fetch_source_branch!).and_call_original
expect(repository).to receive(:delete_refs).and_call_original
compare = repository.compare_source_branch('master', mutable_repository, 'non-existent-branch', straight: false)
expect(compare).to be_nil
end
end
end
end
describe '#checksum' do
it 'calculates the checksum for non-empty repo' do
......
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