handle hg
hg init

hg add hello.go
hg commit --user 'Russ Cox <rsc@golang.org>' --date '2017-10-10T19:39:36-04:00' --message 'hello'

hg log -r ':' --template '{node|short} {desc|strip|firstline}\n'
cmp stdout .hg-log

-- .hg-log --
a8c8e7a40da9 hello
-- hello.go --
package main // import "vcs-test.golang.org/go/custom-hg-hello"

func main() {
	println("hello")
}