Blindly upgrade from Heroku's Bamboo stack to Cedar stack

heroku-set-cedar

#!/bin/bash -e
PREV_PWD=`pwd`
mkdir -p "$HOME/tmp"
cd "$HOME/tmp"

echo "-----> Cloning into $1"
heroku git:clone -a $1
cd $1

echo "-----> Setting stack to cedar"
heroku stack:set cedar

echo "-----> Make a commit"
git commit -m "Upgrade to Heroku Cedar stack" --allow-empty

echo "-----> Deploying app"
git push
cd "$PREV_PWD"

I have a whole bunch of totally vanilla, default little toy apps on the bamboo stack and didn't feel like carefully walking through the lengthy Cedar Stack Migration Guide for each of them. So instead I just made this script executable and ran:

$ heroku-set-cedar try-jasmine

Rather than appending an empty space, what about

echo "-----> Making an arbitrary commit to push"
git commit -m "Upgrade to Heroku Cedar stack" --allow-empty

oh nice, I always forget about that flag.