handle git

env GIT_AUTHOR_NAME='Gopher'
env GIT_AUTHOR_EMAIL='gopher@golang.org'
env GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
env GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL

git init

at 2018-09-27T20:40:31+00:00

git add .gitattributes go.mod export_subst.go
git commit -m 'initial commit'
git branch -m master

-- .gitattributes --
export_subst.go export-subst
-- go.mod --
module vcs-test.golang.org/git/export-subst.git
-- export_subst.go --
package export_subst

const CommitHash = "$Format:%H$"