install.sh

#!/usr/bin/env bash
set -e

MIN_DOCKER_VERSION='17.05.0'
MIN_COMPOSE_VERSION='1.19.0'
MIN_RAM=2400 # MB

DISPATCH_CONFIG_ENV='./.env'
DISPATCH_EXTRA_REQUIREMENTS='./requirements.txt'

DID_CLEAN_UP=0
# the cleanup function will be the exit point
cleanup () {
  if [ "$DID_CLEAN_UP" -eq 1 ]; then
    return 0;
  fi
  echo "Cleaning up..."
  docker-compose stop &> /dev/null
  DID_CLEAN_UP=1
}
trap cleanup ERR INT TERM

echo "Checking minimum requirements..."

DOCKER_VERSION=$(docker version --format '{{.Server.Version}}')
COMPOSE_VERSION=$(docker-compose --version | sed 's/docker-compose version \(.\{1,\}\),.*/\1/')
RAM_AVAILABLE_IN_DOCKER=$(docker run --rm busybox free -m 2>/dev/null | awk '/Mem/ {print $2}');

# Compare dot-separated strings - function below is inspired by https://stackoverflow.com/a/37939589/808368
function ver () { echo "$@" | awk -F. '{ printf("%d%03d%03d", $1,$2,$3); }'; }

# Thanks to https://stackoverflow.com/a/25123013/90297 for the quick `sed` pattern
function ensure_file_from_example {
  if [ -f "$1" ]; then
    echo "$1 already exists, skipped creation."
  else
    echo "Creating $1..."
    cp -n $(echo "$1" | sed 's/\.[^.]*$/.example&/') "$1"
  fi
}

if [ $(ver $DOCKER_VERSION) -lt $(ver $MIN_DOCKER_VERSION) ]; then
    echo "FAIL: Expected minimum Docker version to be $MIN_DOCKER_VERSION but found $DOCKER_VERSION"
    exit -1
fi

if [ $(ver $COMPOSE_VERSION) -lt $(ver $MIN_COMPOSE_VERSION) ]; then
    echo "FAIL: Expected minimum docker-compose version to be $MIN_COMPOSE_VERSION but found $COMPOSE_VERSION"
    exit -1
fi

if [ "$RAM_AVAILABLE_IN_DOCKER" -lt "$MIN_RAM" ]; then
    echo "FAIL: Expected minimum RAM available to Docker to be $MIN_RAM MB but found $RAM_AVAILABLE_IN_DOCKER MB"
    exit -1
fi

# Clean up old stuff and ensure nothing is working while we install/update
docker-compose down --rmi local --remove-orphans

echo ""
echo "Creating volumes for persistent storage..."
echo "Created $(docker volume create --name=dispatch-postgres)."

echo ""
ensure_file_from_example $DISPATCH_CONFIG_ENV
ensure_file_from_example $DISPATCH_EXTRA_REQUIREMENTS

echo ""
echo "Generating secret key..."
# This is to escape the secret key to be used in sed below
SECRET_KEY=$(head /dev/urandom | tr -dc "a-z0-9@#%^&*(-_=+)" | head -c 50 | sed -e 's/[\/&]/\\&/g')
sed -i -e 's/^SECRET_KEY=.*$/SECRET_KEY= '"'$SECRET_KEY'"'/' $DISPATCH_CONFIG_ENV
echo "Secret key written to $DISPATCH_CONFIG_ENV"

echo ""
echo "Building and tagging Docker images..."
echo ""
# Build the dispatch image first
docker-compose pull --ignore-pull-failures
docker build
docker-compose build --force-rm web
docker-compose build --force-rm
echo ""
echo "Docker images built."

# Very naively check whether there's an existing dispatch-postgres volume and the PG version in it
if [[ $(docker volume ls -q --filter name=dispatch-postgres) && $(docker run --rm -v dispatch-postgres:/db busybox cat /db/PG_VERSION 2>/dev/null) == "9.5" ]]; then
    docker volume rm dispatch-postgres-new || true
    # If this is Postgres 9.5 data, start upgrading it to 9.6 in a new volume
    docker run --rm \
    -v dispatch-postgres:/var/lib/postgresql/9.5/data \
    -v dispatch-postgres-new:/var/lib/postgresql/9.6/data \
    tianon/postgres-upgrade:9.5-to-9.6

    # Get rid of the old volume as we'll rename the new one to that
    docker volume rm dispatch-postgres
    docker volume create --name dispatch-postgres
    # There's no rename volume in Docker so copy the contents from old to new name
    # Also append the `host all all all trust` line as `tianon/postgres-upgrade:9.5-to-9.6`
    # doesn't do that automatically.
    docker run --rm -v dispatch-postgres-new:/from -v dispatch-postgres:/to alpine ash -c \
     "cd /from ; cp -av . /to ; echo 'host all all all trust' >> /to/pg_hba.conf"
    # Finally, remove the new old volume as we are all in dispatch-postgres now
    docker volume rm dispatch-postgres-new
fi

echo ""
echo "Setting up database..."
if [ $CI ]; then
  docker-compose run --rm dispatch database upgrade --noinput
else
  docker-compose run --rm dispatch database upgrade
fi

cleanup

echo ""
echo "----------------"
echo "You're all done! Run the following command to get Dispatch running:"
echo ""
echo "  docker-compose up -d"
echo ""