reduce image size; add init system; fix script to be POSIX compliant; fix package dependency

Author: alexei-led

.dockerignore

@@ -1,3 +1,6 @@
+.git
+.gitignore
 node_modules
 logs/*.log
-lib/state.json
+lib/state.json
+*.md

Dockerfile

@@ -1,4 +1,31 @@
-FROM node:onbuild
+FROM alpine:3.5
 
-#CMD ["node", "lib/index.js"]
-CMD ["node", "node_modules/.bin/forever", "--minUptime",  "1", "--spinSleepTime", "1000", "-c", "node", "lib/index.js"]
+# install node
+RUN apk add --no-cache nodejs=6.9.2-r1 tini
+
+# set working directory
+WORKDIR /app
+
+# copy project file
+COPY package.json .
+
+# Build time argument to set NODE_ENV ('production'' by default)
+ARG NODE_ENV
+ENV NODE_ENV ${NODE_ENV:-production}
+
+# install node packages
+RUN apk add --no-cache --virtual .build-dep git && \
+    npm set progress=false && \
+    npm config set depth 0 && \
+    npm install && \
+    npm cache clean && \
+    apk del .build-dep && \
+    rm -rf /tmp/*
+
+# Set tini as entrypoint
+COPY . .
+
+# Set tini as entrypoint
+ENTRYPOINT ["/sbin/tini", "--"]
+
+CMD ["node",  "node_modules/.bin/forever", "--minUptime",  "1", "--spinSleepTime", "1000", "-c", "node", "lib/index.js"]

lib/isReady.sh

@@ -1,10 +1,10 @@
-#!/bin/bash
+#!/bin/sh
 #
 
 CONTAINER_ID=$1
 
 echo "checking if container:$CONTAINER_ID exists"
-if [[ -n "$CONTAINER_ID" ]]; then
+if [ -n "$CONTAINER_ID" ]; then
    grep -q $CONTAINER_ID ./lib/state.json
 else
    grep -q "ready" ./lib/state.json

package.json

@@ -9,14 +9,14 @@
     "cf-errors": "^0.1.11",
     "cf-logs": "git+https://github.com/codefresh-io/cf-logs.git#ceba4f309e52a077747a0c6bf9c3ad02e762dc4b",
     "dockerode": "^2.3.0",
+    "docker-events": "0.0.2",
     "firebase": "^2.4.1",
     "forever": "^0.15.3",
     "lodash": "^4.15.0",
     "q": "^1.4.1"
   },
   "devDependencies": {
     "chai": "^3.0.0",
-    "docker-events": "0.0.2",
     "gulp": "^3.9.1",
     "gulp-coveralls": "^0.1.4",
     "gulp-env": "^0.2.0",