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# frozen_string_literal: true
module Projects
# The CleanupService removes data from the project repository following a
# BFG rewrite: https://rtyley.github.io/bfg-repo-cleaner/
#
# Before executing this service, all refs rewritten by BFG should have been
# pushed to the repository
class CleanupService < BaseService
NoUploadError = StandardError.new("Couldn't find uploaded object map")
include Gitlab::Utils::StrongMemoize
# Attempt to clean up the project following the push. Warning: this is
# destructive!
#
# path is the path of an upload of a BFG object map file. It contains a line
# per rewritten object, with the old and new SHAs space-separated. It can be
# used to update or remove content that references the objects that BFG has
# altered
#
# Currently, only the project repository is modified by this service, but we
# may wish to modify other data sources in the future.
def execute
apply_bfg_object_map!
# Remove older objects that are no longer referenced
GitGarbageCollectWorker.new.perform(project.id, :gc)
# The cache may now be inaccurate, and holding onto it could prevent
# bugs assuming the presence of some object from manifesting for some
# time. Better to feel the pain immediately.
project.repository.expire_all_method_caches
project.bfg_object_map.remove!
end
private
def apply_bfg_object_map!
raise NoUploadError unless project.bfg_object_map.exists?
project.bfg_object_map.open do |io|
repository_cleaner.apply_bfg_object_map(io)
end
end
def repository_cleaner
@repository_cleaner ||= Gitlab::Git::RepositoryCleaner.new(repository.raw)
end
end
end
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