┌ rain /tmp/foo master
┘ git hash-object -w -t blob /dev/null
e69de29bb2d1d6434b8b29ae775ad8c2e48c5391

┌ rain /tmp/foo master
┘ cat .git/objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391 | zlib -d | xxd
00000000: 626c 6f62 2030 00                        blob 0.

┌ rain /tmp/foo master
┘ cat .git/objects/e6/9de29bb2d1d6434b8b29ae775ad8c2e48c5391 | zlib -d | sha1sum
e69de29bb2d1d6434b8b29ae775ad8c2e48c5391  -