enable daily build

.gitignore

@@ -0,0 +1 @@
+report

.travis.yml

@@ -0,0 +1,7 @@
+sudo: required
+
+services:
+ - docker
+
+script:
+ - bash ./build.sh

Dockerfile

@@ -1,5 +1,7 @@
-FROM alpine
+FROM alpine:edge
 
-RUN apk --no-cache add socat
+ARG VERSION=1.7.3.2
+
+RUN apk --no-cache add socat=${VERSION}
 
 ENTRYPOINT ["socat"]

README.md

@@ -4,6 +4,19 @@ Run socat command in alpine container
 
 [![DockerHub Badge](http:https://dockeri.co/image/alpine/socat)](https://hub.docker.com/r/alpine/socat/)
 
+Auto-trigger docker build for [socat](https://pkgs.alpinelinux.org/package/edge/main/x86/socat) when new version is released.
+
+### Repo:
+
+https://github.com/alpine-docker/socat
+
+### Daily build logs:
+
+https://travis-ci.org/alpine-docker/socat
+
+### Docker iamge tags:
+
+https://hub.docker.com/r/alpine/socat/tags/
 
 ## Use Case: Expose a tcp socket for accessing docker API on macOS
 
@@ -43,3 +56,10 @@ $ docker run \
 * To run the container in the background insert ```--detach``` after ```docker run```.
 * To automatically start the container on restart insert ```--restart always``` after ```docker run```.
 * To automatically start the container unless it has been stopped explicitly insert ```--restart unless-stopped``` after ```docker run```.
+
+# The Processes to build this image
+
+* Enable Travis CI cronjob on this repo to run build daily on master branch
+* Check if there are new tags/releases announced via Alpine package url (https://hub.docker.com/r/alpine/socat/)
+* Match the exist docker image tags via Hub.docker.io REST API
+* If not matched, build the image with latest version as tag and push to hub.docker.com

build.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+# Prerequisite
+# Make sure you set secret enviroment variables in Travis CI
+# DOCKER_USERNAME
+# DOCKER_PASSWORD
+
+set -ex
+
+Usage() {
+ echo "$0 [rebuild]"
+}
+
+image="alpine/socat"
+
+#curl -s https://pkgs.alpinelinux.org/package/edge/main/x86/socat |tee output
+#docker run -i --rm -v output:/apps/output alpine/html2text -nobs < output > report
+
+curl -s https://pkgs.alpinelinux.org/package/edge/main/x86/socat | docker run -i --rm -v output:/apps/output alpine/html2text -nobs > report
+
+latest=$(awk '/^Version/ {print $2}' report)
+
+sum=0
+echo "Lastest release is: ${latest}"
+
+tags=`curl -s https://hub.docker.com/v2/repositories/${image}/tags/ |jq -r .results[].name`
+
+for tag in ${tags}
+do
+ if [ ${tag} == ${latest} ];then
+ sum=$((sum+1))
+ fi
+done
+
+if [[ ( $sum -ne 1 ) || ( $1 == "rebuild" ) ]];then
+ docker build --build-arg VERSION=${latest} --no-cache -t ${image}:${latest} .
+ docker tag ${image}:${latest} ${image}:latest
+
+ if [[ "$TRAVIS_BRANCH" == "master" ]]; then
+ docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
+ docker push ${image}:${latest}
+ docker push ${image}:latest
+ fi
+
+fi