chore: add script to test pre/post update commands

test/commands-test.sh

@@ -0,0 +1,147 @@
+#!/usr/bin/env bash
+
+set -e
+
+IMAGE=server
+CONTAINER=server
+WATCHTOWER_INTERVAL=2
+
+function remove_container {
+	docker kill $CONTAINER >> /dev/null || true && docker rm -v $CONTAINER >> /dev/null || true
+}
+
+function cleanup {
+  # Do cleanup on exit or error
+  echo "Final cleanup"
+  sleep 2
+  remove_container
+  pkill -9 -f watchtower >> /dev/null || true
+}
+trap cleanup EXIT
+
+DEFAULT_WATCHTOWER="${GOPATH}/src/github.com/v2tec/watchtower/watchtower"
+WATCHTOWER=$1
+WATCHTOWER=${WATCHTOWER:-$DEFAULT_WATCHTOWER}
+echo "watchtower path is $WATCHTOWER"
+
+##################################################################################
+##### PREPARATION ################################################################
+##################################################################################
+
+#  Create Dockerfile template
+DOCKERFILE=$(cat << EOF
+FROM node:alpine
+
+LABEL com.centurylinklabs.watchtower.pre-update-command="cat /opt/test/value.txt"
+LABEL com.centurylinklabs.watchtower.post-update-command="echo image > /opt/test/value.txt"
+
+ENV IMAGE_TIMESTAMP=TIMESTAMP
+
+WORKDIR /opt/test
+ENTRYPOINT ["/usr/local/bin/node", "/opt/test/server.js"]
+
+EXPOSE 8888
+
+RUN mkdir -p /opt/test && echo "default" > /opt/test/value.txt
+COPY server.js /opt/test/server.js
+EOF
+)
+
+# Create temporary directory to build docker image
+TMP_DIR="/tmp/watchtower-commands-test"
+mkdir -p $TMP_DIR
+
+# Create simple http server
+cat > $TMP_DIR/server.js << EOF
+const http = require("http");
+const fs = require("fs");
+
+http.createServer(function(request, response) {
+	const fileContent = fs.readFileSync("/opt/test/value.txt");
+	response.writeHead(200, {"Content-Type": "text/plain"});
+	response.write(fileContent);
+	response.end();
+}).listen(8888, () => { console.log('server is listening on 8888'); });
+EOF
+
+function builddocker {
+	TIMESTAMP=$(date +%s)
+	echo "Building image $TIMESTAMP"
+	echo "${DOCKERFILE/TIMESTAMP/$TIMESTAMP}" > $TMP_DIR/Dockerfile
+	docker build $TMP_DIR -t $IMAGE >> /dev/null
+}
+
+# Start watchtower
+echo "Starting watchtower"
+$WATCHTOWER -i $WATCHTOWER_INTERVAL --no-pull --stop-timeout 2s --enable-update-commands $CONTAINER &
+sleep 3
+
+echo "#################################################################"
+echo "##### TEST CASE 1: Execute commands from base image"
+echo "#################################################################"
+
+# Build base image
+builddocker
+
+# Run container
+docker run -d -p 0.0.0.0:8888:8888 --name $CONTAINER $IMAGE:latest >> /dev/null
+sleep 1
+echo "Container $CONTAINER is runnning"
+
+# Test default value
+RESP=$(curl -s http://localhost:8888)
+if [ $RESP != "default" ]; then
+	echo "Default value of container response is invalid" 1>&2
+	exit 1
+fi
+
+# Build updated image to trigger watchtower update
+builddocker
+
+WAIT_AMOUNT=$(($WATCHTOWER_INTERVAL * 3))
+echo "Wait for $WAIT_AMOUNT seconds"
+sleep $WAIT_AMOUNT
+
+# Test value after post-update-command
+RESP=$(curl -s http://localhost:8888)
+if [[ $RESP != "image" ]]; then
+	echo "Value of container response is invalid. Expected: image. Actual: $RESP"
+	exit 1
+fi
+
+remove_container
+
+echo "#################################################################"
+echo "##### TEST CASE 2: Execute commands from container and base image"
+echo "#################################################################"
+
+# Build base image
+builddocker
+
+# Run container
+docker run -d -p 0.0.0.0:8888:8888 \
+	--label=com.centurylinklabs.watchtower.post-update-command="echo container > /opt/test/value.txt" \
+	--name $CONTAINER $IMAGE:latest >> /dev/null
+sleep 1
+echo "Container $CONTAINER is runnning"
+
+# Test default value
+RESP=$(curl -s http://localhost:8888)
+if [ $RESP != "default" ]; then
+	echo "Default value of container response is invalid" 1>&2
+	exit 1
+fi
+
+# Build updated image to trigger watchtower update
+builddocker
+
+WAIT_AMOUNT=$(($WATCHTOWER_INTERVAL * 3))
+echo "Wait for $WAIT_AMOUNT seconds"
+sleep $WAIT_AMOUNT
+
+# Test value after post-update-command
+RESP=$(curl -s http://localhost:8888)
+if [[ $RESP != "container" ]]; then
+	echo "Value of container response is invalid. Expected: container. Actual: $RESP"
+	exit 1
+fi