configure

#!/usr/bin/bash
set -o errexit -o pipefail

# Source configuration file
config_file="$(dirname "${BASH_SOURCE[0]}")/configuration.bash"
if [ ! -r "$config_file" ]; then
	echo "Could not read configuration file '$config_file'."
	echo "Copy one from '${config_file}.example'."
	exit 1
fi
. "$config_file"


usage() {
	cat <<EOF
$0 [CHEF_REPO CHEF_ENVIRONMENT CHEF_SOLO_FILE]
	Configure the current host using chef-solo.

	CHEF_REPO the url of the chef configuration repository.
	CHEF_ENVIRONMENT the chef environment for this host.
	CHEF_SOLO_FILE the node template for this host, relative to the CHEF_REPO root.

	Arguments may be specified in order as above or as environment variables in any order:
	env CHEF_REPO='git@github.com:ros-infrastructure/chef-ros-buildfarm' CHEF_ENVIRONMENT=staging CHEF_SOLO_FILE='solo/jenkins.json' $0

	When first run, all arguments must be specified or pre-populated in '$config_file'.
	Subsequent runs will use argument values saved in '$config_file'.
EOF
}

save_configuration() {
	cat <<CONFIGURATION > "$config_file"
CHEF_VERSION=$CHEF_VERSION
CHEF_REPO=$CHEF_REPO
CHEF_BRANCH=$CHEF_BRANCH
CHEF_ENVIRONMENT=$CHEF_ENVIRONMENT
CHEF_SOLO_FILE=$CHEF_SOLO_FILE
CHEF_MAGE_PROFILE=$CHEF_MAGE_PROFILE
CONFIGURATION
}

freshen_chef_repo() {
	if [ ! -d chef_repo ]; then
		git clone "$CHEF_REPO" -b "$CHEF_BRANCH" --recurse-submodules --remote-submodules chef_repo
	else
		pushd chef_repo
		git fetch origin
		git reset --hard origin/$CHEF_BRANCH
		git submodule update --init --remote --recursive
		popd
	fi
}

decrypt_secrets() {
	mage="${wd}/mage"
	MAGE_KEY=$MAGE_KEY "${mage}/mage.sh" -c "${mage}/mage.yml" -P "$CHEF_MAGE_PROFILE" -d
} 

# Fresh CLI args will override configured values
CHEF_REPO="${1:-$CHEF_REPO}"
CHEF_BRANCH="${2:-$CHEF_BRANCH}"
CHEF_ENVIRONMENT="${3:-$CHEF_ENVIRONMENT}"
CHEF_SOLO_FILE="${4:-$CHEF_SOLO_FILE}"
CHEF_MAGE_PROFILE="${5:-$CHEF_MAGE_PROFILE}"

# Check for valid configuration values or command line arguments
if test $# -ne 4 && test -z "$CHEF_REPO" || test -z "$CHEF_BRANCH" || test -z "$CHEF_ENVIRONMENT" || test -z "$CHEF_SOLO_FILE"; then
	usage
	exit 1
fi

save_configuration

freshen_chef_repo

pushd chef_repo
wd="$(pwd)"

if test \( -n "$CHEF_MAGE_PROFILE" -a -z "$MAGE_KEY" \) -o \( -z "$CHEF_MAGE_PROFILE" -a -n "$MAGE_KEY" \); then 
		echo "CHEF_MAGE_PROFILE or MAGE_KEY is not set, and are necessary to perform decryption."
		exit 1
fi

if test -n "$CHEF_MAGE_PROFILE" && test -n "$MAGE_KEY" ; then
	decrypt_secrets
fi


cinc-solo -c "${wd}/.chef/solo.rb" -E "$CHEF_ENVIRONMENT" -j "${wd}/${CHEF_SOLO_FILE}"

# Write date + commit SHA to a changelog
echo "$( date "+%Y-%m-%d %H:%M:%S"):  $(git rev-parse --short HEAD)" >> "../CHEF_COMMITLOG.txt"; 
popd 

# Remove chef repository after configuration
rm -r -f chef_repo