handle git

env GIT_AUTHOR_NAME='Russ Cox'
env GIT_AUTHOR_EMAIL='rsc@golang.org'
env GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
env GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL

git init

at 2018-07-03T22:35:49-04:00
git add go.mod
git commit -m 'initial'
git branch -m master

git log --oneline
cmp stdout .git-log

-- .git-log --
7bb9146 initial
-- go.mod --
module vcs-test.golang.org/git/emptytest.git