docker-entrypoint.sh

#!/bin/bash

set -e

# prepare overlayFS
# shamelessly taken from https://gist.github.com/detunized/7c8fc4c37b49c5475e68ef9574587eee

mkdir -p /tmp/overlay && \
mount -t tmpfs tmpfs /tmp/overlay && \
mkdir -p /tmp/overlay/{upper,work} && \
mkdir -p /workdir-rw && \
mount -t overlay overlay -o lowerdir=/workdir,upperdir=/tmp/overlay/upper,workdir=/tmp/overlay/work /workdir-rw

cd /workdir-rw

# if we are given arguments we assume
#  $1 will be "--serve" and
#  $2 the actual stack to run tf in
# so we have to init terraform in the given directory $2
# if $2 is no directory just fall back to the default and run
# terraform init in /workdir

# are we meant to run terraform in a sub-directory?
[ $# == 2 ] && [ -d "$2" ] && {
    cd $2
}

# is terraform already initialized? 
[ -d '.terraform' ] && terraform get --update=true

# re-initialize anyway.
terraform init -input=false

# it's possible that we're in a sub-directory. leave.
cd /workdir-rw

# okay, we should be good to go.
blast-radius $1 $2 $3