use alpine base image (#4)

Dockerfile

@@ -1,25 +1,20 @@
-FROM debian:stretch
+FROM alpine:3.6
 
-RUN apt-get update && apt-get install -y git
+COPY init.sh /
+RUN apk add --update git openssh
 
-ARG USER=1001
+RUN addgroup -g 1000 -S git && \
+    adduser -u 1000 -S git -G git
 
-ADD [--chown=$USER:root] init.sh /
-RUN chmod +x /init.sh
-
-USER root
-
-RUN mkdir /root/.ssh/ && \
+RUN mkdir /home/git/.ssh/  && \
+    chown git /home/git/.ssh && \
 	mkdir /repository && \
-	touch /root/.ssh/known_hosts && \
-	echo "\nStrictHostKeyChecking no" >> /etc/ssh/ssh_config
-
-RUN chgrp -R 0 /root && \
-    chmod -R g=u /root
-
-# Clean up
-RUN apt-get autoremove -y && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+	chown git /repository && \
+	touch /home/git/.ssh/known_hosts && \
+	echo "" >> /etc/ssh/ssh_config && \
+	echo "StrictHostKeyChecking no" >> /etc/ssh/ssh_config &&\
+	chown git /etc/ssh/ssh_config
 
-USER $USER
+USER git
 
 CMD ["/init.sh"]

init.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 if [ -z "$REPO_LINK" ]; then 
 	echo -e "\033[1;91mERROR:\033[0m REPO_LINK env variable is required"
@@ -17,26 +17,26 @@ echo "repository : $REPO_LINK"
 echo "branch     : $REPO_BRANCH"
 echo "tag        : $REPO_TAG"
 echo "revision   : $REPO_REVISION"
+
 # check if credentials files exist
 if [[ -f "/key/$REPO_KEY" ]] ; then 
 	echo "key file   : $REPO_KEY"
-	cp /key/$REPO_KEY /root/.ssh/id_rsa
-	chmod 600 /root/.ssh/id_rsa
-	ssh-keyscan -H gitlab.com >> /root/.ssh/known_hosts
+	cp /key/$REPO_KEY /home/git/.ssh/id_rsa
+	chmod 600 /home/git/.ssh/id_rsa
+	ssh-keyscan -H gitlab.com >> /home/git/.ssh/known_hosts
 fi
 
 if [ ! -z "$REPO_USER" ] && [ ! -z "$REPO_PASS" ]; then 
 	# clone with repository username & password
 	echo "credentials: username and password"
 	git clone -b $REPO_BRANCH https://$REPO_USER:$REPO_PASS@$REPO_LINK /repository
 else
-    if [[ ! -f "/root/.ssh/id_rsa" ]] ; then
+    if [[ ! -f "/home/git/.ssh/id_rsa" ]] ; then
 	    echo -e "\033[1;93mWARNING:\033[0m REPO_USER, REPO_PASS env variables or SSH deployment key missing"
 	else
 	    # clone public repository or using ssh deployment key
 	    echo "credentials: RSA key"
 	fi
-	ls -lah /repository
 	git clone -b $REPO_BRANCH $REPO_LINK /repository
 fi