Use a docker container to make images build repeatable and deterministic

.travis.yml

@@ -1,16 +1,45 @@
 language: bash
 
-sudo: false
+sudo: required
 
-addons:
-  apt:
-    sources:
-    - debian-sid
-    packages:
-    - shellcheck
+before_script:
+ - sudo apt-get --yes --no-install-recommends install binfmt-support qemu-user-static
+ - echo ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:' | sudo tee -a /proc/sys/fs/binfmt_misc/register
+   # Install shellcheck. Workaround for this issue: https://github.com/travis-ci/travis-ci/issues/8823
+ - curl -sSL "https://ftp-master.debian.org/keys/archive-key-7.0.asc" | sudo -E apt-key add -
+ - echo "deb http://ftp.us.debian.org/debian unstable main contrib non-free" | sudo tee -a /etc/apt/sources.list > /dev/null
+ - sudo apt-get update
+ - sudo apt-get install -y shellcheck
+
+services:
+ - docker
+
+env:
+ - ARCH=arm BOARD=pi
+ - ARCH=arm BOARD=sparky
+ - ARCH=arm BOARD=bbb
+ - ARCH=arm BOARD=bpim2u
+ - ARCH=armv7 BOARD=cuboxi
+ - ARCH=armv7 BOARD=odroidc1
+ - ARCH=armv7 BOARD=odroidc2
+ - ARCH=armv7 BOARD=odroidxu4
+ - ARCH=armv7 BOARD=odroidx2
+ - ARCH=armv7 BOARD=udooneo
+ - ARCH=armv7 BOARD=udooqdl
+ - ARCH=armv7 BOARD=pine64
+ - ARCH=armv7 BOARD=nanopi64
+ - ARCH=armv7 BOARD=bpipro
+ - ARCH=armv7 BOARD=tinkerboard
+ - ARCH=armv7 BOARD=sopine64
+ - ARCH=armv7 BOARD=rock64
+ - ARCH=armv7 BOARD=voltastream0
+ - ARCH=armv7 BOARD=nanopineo
+ - ARCH=armv7 BOARD=nanopineo2
+ - ARCH=x86 BOARD=x86
 
 script:
  - find . -iname "*.sh" -exec shellcheck "{}" \;
+ - ./docker-build.sh -b ${ARCH} -d ${BOARD} -v 2.$(git rev-list HEAD --count)
 
 matrix:
   fast_finish: true

docker-build.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Docker based image builder
+#
+# This is an alternative method for building a volumio image that does not
+# require the user to have a debian system with specific packages versions.
+#
+# This method relies on a pre-built docker container that will perform the
+# whole build process and generate the required image in the local directory.
+
+DOCKER="docker"
+
+DPATH=$(which "${DOCKER}" 2> /dev/null)
+FOUND=$?
+RUNDATE=$(date "+%Y-%m-%d")
+
+if [ "${FOUND}" != "0" ]; then
+	echo "You need to have ${DOCKER} installed to be able to perform a Docker based build"
+	exit 1
+fi
+
+if [ $# -lt 2 ]; then
+	echo "Missign build parameters!"
+	echo
+	echo "This script is a wrapper around the main ./build.sh script, and as such it requires specific parameters"
+	echo "to be passed over to build.sh."
+	echo
+	echo "Please run the command ./build.sh without parameters for a full help."
+	exit 2
+fi
+
+${DOCKER} run -it --rm --name=volumio-build --privileged \
+	-v ${PWD}:/build piffio/volumio-build \
+	$@ | tee docker-build-${RUNDATE}.log