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module Lfs
# Usage: Open a `.link_lfs_objects` block, call `new_file` on the yielded object
# as many times as needed. LfsObjectProject links will be saved if the
# return value of the block is truthy.
#
# Calling `new_file` will check the path to see if it should be in LFS,
# save and LFS pointer of needed and return its content to be saved in
# a commit. If the file isn't LFS the untransformed content is returned.
#
# Lfs::FileTransformer.link_lfs_objects(project, @branch_name) do |transformer|
# content_or_lfs_pointer = transformer.new_file(file_path, file_content)
# create_transformed_commit(content_or_lfs_pointer)
# end
class FileTransformer
attr_reader :project, :branch_name
delegate :repository, to: :project
def initialize(project, branch_name)
@project = project
@branch_name = branch_name
end
def self.link_lfs_objects(project, branch_name)
transformer = new(project, branch_name)
result = yield(transformer)
transformer.after_transform! if result
result
end
def new_file(file_path, file_content)
if project.lfs_enabled? && lfs_file?(file_path)
lfs_pointer_file = Gitlab::Git::LfsPointerFile.new(file_content)
lfs_object = create_lfs_object!(lfs_pointer_file, file_content)
on_success_actions << -> { link_lfs_object!(lfs_object) }
lfs_pointer_file.pointer
else
file_content
end
end
def after_transform!
on_success_actions.map(&:call)
end
private
def lfs_file?(file_path)
repository.attributes_at(branch_name, file_path)['filter'] == 'lfs'
end
def on_success_actions
@on_success_actions ||= []
end
def create_lfs_object!(lfs_pointer_file, file_content)
LfsObject.find_or_create_by(oid: lfs_pointer_file.sha256, size: lfs_pointer_file.size) do |lfs_object|
lfs_object.file = CarrierWaveStringFile.new(file_content)
end
end
def link_lfs_object!(lfs_object)
project.lfs_objects << lfs_object
end
end
end
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