cmd/go/testdata/vcstest/git: use git commands that work on older git versions

On older versions of git (such as 2.25.1), `git branch -M master`
fails after `git init` - use `git checkout -b master` instead, which
works across multiple versions.

Fixes tests on the rather outdated linux/mips* builders.

Change-Id: Id86ec82b37a8d2c3131f449276b13989d097d106
Reviewed-on: https://go-review.googlesource.com/c/go/+/729600
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

diff --git a/src/cmd/go/testdata/vcstest/git/legacytest.txt b/src/cmd/go/testdata/vcstest/git/legacytest.txt
index 5846983cef3393505a097d56917281f38b509a9f..6465242d6211f223663c15114c380b7752813f92 100644 (file)
--- a/src/cmd/go/testdata/vcstest/git/legacytest.txt
+++ b/src/cmd/go/testdata/vcstest/git/legacytest.txt
@@ -6,7 +6,7 @@ env GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME
 env GIT_COMMITTER_EMAIL=$GIT_AUTHOR_EMAIL
 
 git init
-git branch -M master
+git checkout -b master
 
 at 2018-07-17T12:41:39-04:00
 cp x_cf92c7b.go x.go