find .git/objects/ -type f
find .git/objects/ -type f | wc -l
git add *
git commit -a -m "8 commit"
ls -l .git/refs/tags/
git tag v2.0
cat .git/refs/tags/v2.0
git cat-file -t 45672
find .git/objects/ -type f | wc -l
g
git tag -a milestone1.0 -m "this is the first stable version"
find .git/objects/ -type f | wc -l
一次性提交
git commit -a -m "third commit"
找回前面的版本
cat .git/refs/heads/master
cat .git/refs/tags/v2.0
把v2.0 提取出来
git archive --format=tar --prefix=ruby/ v2.0 | gzip > /home/ruby2.0.tar.gz
cd /home
根据什么来提取出来的