Run test suite on minimal PHP 5.6

.gitignore

@@ -1,3 +1,3 @@
-/vendor
-/.docker-image-id
 /dist
+/docker/*.image
+/vendor

Makefile

@@ -1,22 +1,22 @@
-RUN = docker run -it -v $(shell pwd):/data -w /data $(shell cat .docker-image-id)
+PHP56 = docker run -it -v $(shell pwd):/data -w /data $(shell cat docker/php56.image)
+PHP56MIN = docker run -it -v $(shell pwd):/data -w /data $(shell cat docker/php56-min.image)
 
 
 .PHONY : all test test-local update docker dist
 
 
 all : vendor/autoload.php
 
-test : all docker
-	$(RUN) vendor/bin/phpunit
+test : all docker/php56.image docker/php56-min.image
+	$(PHP56) vendor/bin/phpunit
+	$(PHP56MIN) vendor/bin/phpunit
 
 test-local : all
 	vendor/bin/phpunit
 
 update : all
 	vendor/composer.phar update
 
-docker : .docker-image-id
-
 dist : all
 	bin/package
 
@@ -30,6 +30,6 @@ vendor/composer.phar :
 	chmod +x $@~
 	mv $@~ $@
 
-.docker-image-id : Dockerfile docker/entrypoint
-	docker build -q . > $@~
+docker/%.image : docker/% docker/entrypoint
+	docker build -q -f $< docker > $@~
 	mv $@~ $@

docker/entrypoint

@@ -1,9 +1,9 @@
-#!/bin/bash
+#!/bin/sh
 
-set -euo pipefail
+set -eu
 
-if [[ -d /data ]]; then
-    usermod -u `stat --printf=%u /data` docker 2>&1 | grep -v '^usermod: no changes' || :
+if [ -d /data ]; then
+    usermod -u `stat -c %u /data` docker 2>&1 | grep -v '^usermod: no changes' || :
 fi
 
 sudo -u docker "$@"

Dockerfile → docker/php56

@@ -14,5 +14,5 @@ RUN apt-get update && apt-get install -y \
 
 RUN useradd -m docker
 
-COPY docker/entrypoint /entrypoint
+COPY entrypoint /entrypoint
 ENTRYPOINT ["/bin/bash", "/entrypoint"]

docker/php56-min

@@ -0,0 +1,15 @@
+FROM alpine:latest
+
+RUN apk update && \
+    apk add \
+        shadow \
+        sudo \
+        php5 \
+        php5-dom
+
+RUN ln -s /usr/bin/php5 /usr/bin/php
+
+RUN useradd -m docker
+
+COPY entrypoint /entrypoint
+ENTRYPOINT ["/bin/sh", "/entrypoint"]