gitlab-org--gitlab-foss/app/services/compare_service.rb

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require 'securerandom'
# Compare 2 branches for one repo or between repositories
# and return Gitlab::CompareResult object that responds to commits and diffs
class CompareService
def execute(source_project, source_branch, target_project, target_branch)
source_commit = source_project.commit(source_branch)
return unless source_commit
source_sha = source_commit.sha
# If compare with other project we need to fetch ref first
unless target_project == source_project
random_string = SecureRandom.hex
target_project.repository.fetch_ref(
source_project.repository.path_to_repo,
"refs/heads/#{source_branch}",
"refs/tmp/#{random_string}/head"
)
end
Gitlab::CompareResult.new(
Gitlab::Git::Compare.new(
target_project.repository.raw_repository,
target_branch,
source_sha,
)
)
end
end