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 2021-08-11T13:52:00-04:00
git add cmd
git commit -m 'add cmd/issue47650'
git branch -m main
git tag v0.1.0

git add go.mod
git commit -m 'add go.mod'

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

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

-- .git-refs --
21535ef346c3e79fd09edd75bd4725f06c828e43 refs/heads/main
4d237df2dbfc8a443af2f5e84be774f08a2aed0c refs/tags/v0.1.0
-- .git-log --
21535ef (HEAD -> main) add go.mod
4d237df (tag: v0.1.0) add cmd/issue47650
-- go.mod --
module vcs-test.golang.org/git/issue47650.git

go 1.17
-- cmd/issue47650/main.go --
package main

import "os"

func main() {
	os.Stdout.WriteString("Hello, world!")
}