Add .git-credentials file.

testing_support/gerrit-init.sh

 #!/bin/bash
 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 if [ -n "$1" ]; then
   rundir="$1"
 else
   rundir=$(mktemp -d)
 fi
@@ skipping 111 matching lines @@
 INSERT INTO ACCOUNT_EXTERNAL_IDS (ACCOUNT_ID, EMAIL_ADDRESS, PASSWORD) VALUES (${account_id}, '${preferred_email}', '${password}');
 INSERT INTO ACCOUNT_GROUP_MEMBERS (ACCOUNT_ID, GROUP_ID) VALUES (${account_id}, 1);
 EOF
 
 # Create a netrc file to authenticate as the first user.
 mkdir -p "${rundir}/tmp"
 cat <<EOF > "${rundir}/tmp/.netrc"
 machine localhost login ${username} password ${password}
 EOF
 
+# Create a .git-credentials file, to enable password-less push.
+cat <<EOF > "${rundir}/tmp/.git-credentials"
+http://${username}:${password}@localhost:8080
+EOF
+
 echo
 echo "To start gerrit server:"
 echo "  ${rundir}/bin/gerrit.sh start"
 echo
 echo "To use the REST API:"
 echo "  curl --netrc-file ${rundir}/tmp/.netrc http://localhost:8080/<endpoint>"
 echo
+echo "To enable 'git push' without a password prompt:"
+echo "  git config credential.helper 'store --file=${rundir}/tmp/.git-credentials'"
+echo
 echo "To stop the server:"
 echo "  ${rundir}/bin/gerrit.sh stop"
 echo