Run tests on 32-bit systems on Travis CI

.travis.yml

@@ -1,6 +1,9 @@
 language: php
 os: linux
 
+services:
+  - docker
+
 jobs:
   fast_finish: true
   include:
@@ -16,12 +19,18 @@ jobs:
     - php: 7.2
     - php: 7.2
       arch: s390x
+    - php: 7.2
+      env: ARCH=arm32
     - php: 7.3
     - php: 7.3
       arch: s390x
+    - php: 7.3
+      env: ARCH=arm32
     - php: 7.4
     - php: 7.4
       arch: s390x
+    - php: 7.4
+      env: ARCH=arm32
     - php: nightly
     - php: nightly
       arch: s390x
@@ -36,21 +45,23 @@ addons:
       - libsodium-dev
       - uuid-dev
 
+cache:
+  directories:
+    - $HOME/.composer
+
 before_install:
-  - ./resources/scripts/system-info.sh
-  - yes '' | pecl install -f libsodium-1.0.7
-  - yes '' | pecl install -f uuid-1.0.4
-  - travis_retry composer self-update
+  - travis_retry ./resources/scripts/travis-before-install.sh
+  - ./resources/scripts/cmd-proxy.sh ./resources/scripts/system-info.sh
 
 install:
-  - travis_retry composer require --no-update "php-coveralls/php-coveralls:^1 | ^2"
-  - travis_retry composer install --no-interaction --prefer-dist --no-progress --no-suggest
+  - travis_retry ./resources/scripts/cmd-proxy.sh composer require --no-update "php-coveralls/php-coveralls:^1 | ^2"
+  - travis_retry ./resources/scripts/cmd-proxy.sh composer install --no-interaction --prefer-dist --no-progress --no-suggest
 
 before_script:
   - mkdir -p build/logs
 
 script:
-  - travis_wait composer run-script --timeout=1200 test-ci
+  - travis_wait ./resources/scripts/cmd-proxy.sh composer run-script --timeout=1200 test-ci
 
 after_success:
-  - travis_retry ./resources/scripts/php-coveralls.sh
+  - travis_retry ./resources/scripts/cmd-proxy.sh ./resources/scripts/php-coveralls.sh

resources/scripts/cmd-proxy.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+#
+# This script uses the ARCH environment variable to determine whether to run
+# the commands through a 32-bit Docker container, for 32-bit testing. If the
+# ARCH is anything other than "arm32," then it simply executes the commands
+# on the local system, rather than in a container.
+
+php_version=${TRAVIS_PHP_VERSION:-$(php -r "echo phpversion();")}
+php_version=${php_version%.*}
+architecture=${ARCH:-${TRAVIS_CPU_ARCH:-$(uname -m)}}
+
+cmd_proxy=""
+
+if [ "${architecture}" == "arm32" ]; then
+    image="benramsey/ramsey-uuid:php-${php_version}-arm32v7"
+    volumes="-v ${PWD}:/app -v ${HOME}/.composer:/root/.composer"
+    cmd_proxy="docker run -it --rm ${volumes} -w /app ${image}"
+fi
+
+$cmd_proxy $@

resources/scripts/php-coveralls.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 set -e
 

resources/scripts/system-info.sh

@@ -1,9 +1,9 @@
-#!/bin/bash
+#!/bin/sh
 
-endianness=$(echo -n I | od -to2 | awk '{ print substr($2,6,1); exit}')
+endianness=$(printf I | hexdump -o | awk '{ print substr($2,6,1); exit}')
 
 endian="Big"
-if [ $endianness -eq 1 ]; then
+if [ "${endianness}" == "1" ]; then
     endian="Little"
 fi
 
@@ -15,3 +15,5 @@ echo
 echo "CPU mode: $(getconf LONG_BIT)-bit"
 echo "Endianness: ${endian}"
 echo
+php --version
+echo

resources/scripts/travis-before-install.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+#
+# This script runs as part of the Travis CI before_install phase. If the ARCH
+# environment variable is set and has the value "arm32," then we exit early,
+# since we will use a pre-built Docker image to run commands instead.
+
+architecture=${ARCH:-${TRAVIS_CPU_ARCH:-$(uname -m)}}
+
+if [ "${architecture}" == "arm32" ]; then
+    exit
+fi
+
+yes '' | pecl install -f libsodium-1.0.7
+yes '' | pecl install -f uuid-1.0.4
+composer self-update