simply figure out the sha
# File lib/grit/git-ruby/internal/loose.rb, line 87 def self.calculate_sha(content, type) size = content.length.to_s verify_header(type, size) header = "#{type} #{size}\00"" store = header + content Digest::SHA1.hexdigest(store) end
# File lib/grit/git-ruby/internal/loose.rb, line 27 def [](sha1) sha1 = sha1.unpack("H*")[0] begin return nil unless sha1[0...2] && sha1[2..39] path = @directory + '/' + sha1[0...2] + '/' + sha1[2..39] get_raw_object(open(path, 'rb') { |f| f.read }) rescue Errno::ENOENT nil end end
# File lib/grit/git-ruby/internal/loose.rb, line 38 def get_raw_object(buf) if buf.length < 2 raise LooseObjectError, "object file too small" end if legacy_loose_object?(buf) content = Zlib::Inflate.inflate(buf) header, content = content.split(/\00//, 2) if !header || !content raise LooseObjectError, "invalid object header" end type, size = header.split(/ /, 2) if !%(blob tree commit tag).include?(type) || size !~ /^\d+$/ raise LooseObjectError, "invalid object header" end type = type.to_sym size = size.to_i else type, size, used = unpack_object_header_gently(buf) content = Zlib::Inflate.inflate(buf[used..-1]) end raise LooseObjectError, "size mismatch" if content.length != size return RawObject.new(type, content) end
currently, I’m using the legacy format because it’s easier to do this function takes content and a type and writes out the loose object and returns a sha
# File lib/grit/git-ruby/internal/loose.rb, line 65 def put_raw_object(content, type) size = content.length.to_s LooseStorage.verify_header(type, size) header = "#{type} #{size}\00"" store = header + content sha1 = Digest::SHA1.hexdigest(store) path = @directory+'/'+sha1[0...2]+'/'+sha1[2..40] if !File.exists?(path) content = Zlib::Deflate.deflate(store) FileUtils.mkdir_p(@directory+'/'+sha1[0...2]) File.open(path, 'wb') do |f| f.write content end end return sha1 end
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