handle git

env GIT_AUTHOR_NAME='Bryan C. Mills'
env GIT_AUTHOR_EMAIL='bcmills@google.com'
env GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
env GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL

git init

at 2019-04-03T11:52:15-04:00
env GIT_AUTHOR_DATE=2019-04-03T11:44:11-04:00
git add go.mod
git commit -m 'all: add go.mod'
git branch -m master
git tag 'v2.0.0'

git show-ref --tags --heads
cmp stdout .git-refs

-- .git-refs --
203b91c896acd173aa719e4cdcb7d463c4b090fa refs/heads/master
203b91c896acd173aa719e4cdcb7d463c4b090fa refs/tags/v2.0.0
-- go.mod --
module vcs-test.golang.org/go/v2module/v2

go 1.12