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 2018-04-25T10:59:24-04:00
git add p1 p2
git commit -m 'initial commit'
git branch -m master

git log --oneline --decorate=short
cmp stdout .git-log

-- .git-log --
6b4ba8b (HEAD -> master) initial commit
-- p1/p1.go --
package p1

import _ "vcs-test.golang.org/git/modlegacy1-old.git/p2"
import _ "vcs-test.golang.org/git/modlegacy1-new.git/p1"
import _ "vcs-test.golang.org/git/modlegacy1-new.git"
-- p2/p2.go --
package p2