#!/bin/bash
# PR a supervisor release to meta-resin
#
# It clones meta-resin and opens a PR changing the supervisor version to $TAG.
# If a meta-resin folder exists, it assumes it has a meta-resin git repo.
#
# If $PR_1X is "true", an additional PR for 1.X will be created.
#
# Requires $GITHUB_USERNAME and $GITHUB_PASSWORD to push and create the pull-request.
# Requires $TAG to be set to the supervisor version to use.
#

set -e

THIS_FILE=$0
if [ -z "$TAG" ]; then
	cat $THIS_FILE | awk '{if(/^#/)print;else exit}' | tail -n +2 | sed 's/\#//'
	exit 1
fi

if [[ -z "$GITHUB_PASSWORD" || -z "$GITHUB_USERNAME" ]]; then
	echo "GITHUB_USERNAME and GITHUB_PASSWORD are required"
	exit 1
fi

USER=${USER:-$(whoami)}

function prepareBranches() {
	BASE=$1
	HEAD=$2
	git checkout $BASE
	git reset HEAD
	git checkout .
	git fetch
	git merge origin/${BASE}
	git checkout -b ${HEAD}
}

function setSupervisorTag() {
	sed -i "s/SUPERVISOR_TAG ?= \".*\"/SUPERVISOR_TAG ?= \"${TAG}\"/" meta-resin-common/recipes-containers/docker-disk/docker-resin-supervisor-disk.bb
}

function commitAndPR() {
	BASE=$1
	HEAD=$2
	git commit -as -m "
docker-resin-supervisor-disk: Update to ${TAG}

Changelog-Entry: Update supervisor to ${TAG}
Change-Type: patch
" <<EOF
${GITHUB_USERNAME}
${GITHUB_PASSWORD}
EOF

	git push origin $HEAD
	hub pull-request -b ${BASE} -m "${BASE}: Update supervisor to ${TAG}

Change-Type: patch
" <<EOF
${GITHUB_USERNAME}
${GITHUB_PASSWORD}
EOF

}

if [ ! -d "./meta-resin" ]; then
	echo "Cloning meta-resin..."
	git clone https://github.com/resin-os/meta-resin.git
else
	echo "Using available meta-resin repo"
fi
cd meta-resin

echo "Creating pull request to add supervisor ${TAG} on master"
prepareBranches master supervisor-${TAG}
setSupervisorTag
commitAndPR master supervisor-${TAG}

if [ "$PR_1X" = "true" ]; then
	echo "Creating pull request to add supervisor ${TAG} on 1.X"
	prepareBranches 1.X 1.X-supervisor-${TAG}
	setSupervisorTag	
	commitAndPR 1.X 1.X-supervisor-${TAG}
fi