If you want your git-commit hash looks strange, use me!
Download this project and make install.
In your own git repo, you just run vgitcommit 'Update documents. %s' instead of running git commit -m 'Update documents'.
By default, this tool generates commit-hash with 8 leading-zero. If you want to change this behavior, just modify line 83 of git-commit-hash-vanity.cc.