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

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# Compare 2 branches for one repo or between repositories
# and return Gitlab::CompareResult object that responds to commits and diffs
class CompareService
def execute(current_user, source_project, source_branch, target_project, target_branch)
# Try to compare branches to get commits list and diffs
#
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# Note: Use satellite only when need to compare between two repos
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# because satellites are slower than operations on bare repo
if target_project == source_project
Gitlab::CompareResult.new(
Gitlab::Git::Compare.new(
target_project.repository.raw_repository,
target_branch,
source_branch,
)
)
else
Gitlab::Satellite::CompareAction.new(
current_user,
target_project,
target_branch,
source_project,
source_branch
).result
end
end
end