#!/bin/bash

# clean up previous runs
rm -rf /tmp/child /tmp/child.git /tmp/parent

#
# dummy child project
#
cd /tmp
git init child
cd child
echo "Hello" > README.md
git add . && git commit -m "initial commit"

#
# fake remote of child project
#
cd /tmp
git clone --bare file:///tmp/child

#
# Create parent repo with child submodule
#
cd /tmp
git init parent
cd parent
mkdir vendor
git submodule add -b master file:///tmp/child.git vendor/child
git commit -m "initial superproject commit"

#
# do an update to the child project
#
cd /tmp/child
echo "Bye" >> README.md
git commit -a -m "update readme"
git remote add origin file:///tmp/child.git
git push -u origin master

#
# go back into superproject and try to update
#
cd /tmp/parent
git submodule update --remote
cd vendor/child
git status
git version

# last 4 lines of output...

# Submodule path 'vendor/child': checked out 'e6ee142b76dd926ff723f819351ccef1ddd5c38c'
# HEAD detached at e6ee142
# nothing to commit, working tree clean
# git version 2.9.3