A draft rancher management script using bash and jshon

rancher.sh

#!/bin/sh -e
# set -x

RANCHER_URL="rancher.mydomain.com"
PROJECT_ID="1a5" #id of my stack in rancher

CATTLE_ACCESS_KEY=MY_RANCHER_ACCESS_KEY
CATTLE_SECRET_KEY=MY_RANCHER_ACCESS_SECRET

TMP_FILE=$(mktemp)

# GET SERVICES

curl -s -u "${CATTLE_ACCESS_KEY}:${CATTLE_SECRET_KEY}" \
-X GET \
-H 'Accept: application/json' \
-H 'Content-Type: application/json' \
"https://${RANCHER_URL}/v1/projects/${PROJECT_ID}/services" > $TMP_FILE

SERVICE_COUNT=$(cat $TMP_FILE | jshon -e data -l)

# PARSE IDs AND NAMEs

for i in $(seq 0 $(($SERVICE_COUNT - 1))); do
	SERVICE_JSONS[$i]=$(cat $TMP_FILE | jshon -e data -e $i)
	SERVICE_NAMES[$i]=$(echo -e ${SERVICE_JSONS[$i]} | jshon -e name -u)
	SERVICE_IDS[$i]=$(echo -e ${SERVICE_JSONS[$i]} | jshon -e id -u)
done

rm $TMP_FILE

# LIST SERVICES AND THEIR STATUS

if [ $# -eq 0 ]; then
	TMP_FILE=$(mktemp)
	for i in $(seq 0 $(($SERVICE_COUNT - 1))); do
		STATE=$(echo -e ${SERVICE_JSONS[$i]} | jshon -e state -u)
		echo -e "\t${SERVICE_IDS[$i]}\t${SERVICE_NAMES[$i]}\t${STATE}" >> $TMP_FILE
	done
	cat $TMP_FILE | column -t
  rm $TMP_FILE

	exit 0
fi

SERVICE_NAME="$1"; shift
SERVICE_ID="~"
SERVICE_IDX=-1
for i in $(seq 0 $(($SERVICE_COUNT - 1))); do
	if [ "${SERVICE_NAMES[$i]}" == "${SERVICE_NAME}" ]; then
		SERVICE_ID=${SERVICE_IDS[$i]}
		SERVICE_IDX=$i
		SERVICE_STATE=$(echo -e ${SERVICE_JSONS[$i]} | jshon -e state -u)
	fi
done
if [ "$SERVICE_ID" == "~" ]; then
	echo "No such service: ${SERVICE_NAME}"
	exit 1
fi

# NO ACTION?
if [ $# -eq 0 ]; then
	echo "SERVICE: ${SERVICE_NAME} ${SERVICE_ID} ${SERVICE_STATE}"
	exit 0;
fi


ACTION="$1"

if [ "$ACTION" == "upgrade" ]; then
	echo "Upgrading.."

	curl -s -u "${CATTLE_ACCESS_KEY}:${CATTLE_SECRET_KEY}" \
	-X POST \
	-H 'Accept: application/json' \
	-H 'Content-Type: application/json' \
	-d '{"inServiceStrategy":{"startFirst":true,"secondaryLaunchConfigs":[]}, "toServiceStrategy":{}}' \
	"https://${RANCHER_URL}/v1/projects/${PROJECT_ID}/services/${SERVICE_ID}/?action=upgrade"

	echo "done."

	exit 0;
fi

if [ "$ACTION" == "finishupgrade" ]; then
	echo "Finishing Upgrade.."

	curl -s -u "${CATTLE_ACCESS_KEY}:${CATTLE_SECRET_KEY}" \
	-X POST \
	-H 'Accept: application/json' \
	-H 'Content-Type: application/json' \
	-d '{"inServiceStrategy":{"startFirst":true,"secondaryLaunchConfigs":[]}, "toServiceStrategy":{}}' \
	"https://${RANCHER_URL}/v1/projects/${PROJECT_ID}/services/${SERVICE_ID}/?action=finishupgrade"

	echo "done."

	exit 0;
fi

echo "Unknown action: $ACTION"
exit 1;

Usage:

# list services in my stack
./rancher.sh

# upgrade frontend service
./rancher.sh frontend upgrade && ./rancher.sh frontend finishupgrade

Currently this doesn't have a state polling to check if upgrade is finished,