ci: attempt to test packaging and installing a gem

.github/workflows/gem-install.yml

@@ -0,0 +1,99 @@
+name: gem-install
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+      - v*.*.x
+    tags:
+      - v*.*.*
+  pull_request:
+    types: [opened, synchronize]
+    branches:
+      - '*'
+
+jobs:
+  cruby-package:
+    name: "cruby-package"
+    runs-on: ubuntu-latest
+    container:
+      image: "larskanis/rake-compiler-dock-mri-x86_64-linux:1.1.0"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          path: ports/archives
+          key: tarballs-${{hashFiles('**/dependencies.yml')}}
+          restore-keys: tarballs-
+      - run: ./scripts/test-gem-build gems ruby
+      - uses: actions/upload-artifact@v2
+        with:
+          name: cruby-gem
+          path: gems
+          retention-days: 1
+
+  cruby-linux-install:
+    needs: ["cruby-package"]
+    strategy:
+      fail-fast: false
+      matrix:
+        sys: ["enable", "disable"]
+    runs-on: ubuntu-latest
+    container:
+      image: "flavorjones/nokogiri-test:mri-3.0"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/download-artifact@v2
+        with:
+          name: cruby-gem
+          path: gems
+      - run: ./scripts/test-gem-install gems --${{matrix.sys}}-system-libraries
+
+  cruby-osx-install:
+    needs: ["cruby-package"]
+    strategy:
+      fail-fast: false
+      matrix:
+        sys: ["enable", "disable"]
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/download-artifact@v2
+        with:
+          name: cruby-gem
+          path: gems
+      - run: ./scripts/test-gem-install gems --${{matrix.sys}}-system-libraries
+
+  cruby-windows-install:
+    needs: ["cruby-package"]
+    strategy:
+      fail-fast: false
+      matrix:
+        sys: ["enable", "disable"]
+    runs-on: windows-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/download-artifact@v2
+        with:
+          name: cruby-gem
+          path: gems
+      - run: ./scripts/test-gem-install gems --${{matrix.sys}}-system-libraries
+
+  cruby-x86_64-package:
+    name: "cruby-x86_64-package"
+    runs-on: ubuntu-latest
+    container:
+      image: "larskanis/rake-compiler-dock-mri-x86_64-linux:1.1.0"
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          path: ports/archives
+          key: tarballs-${{hashFiles('**/dependencies.yml')}}
+          restore-keys: tarballs-
+      - run: ./scripts/test-gem-build gems x86_64-linux
+      - uses: actions/upload-artifact@v2
+        with:
+          name: cruby-x86_64-gem
+          path: gems
+          retention-days: 1

scripts/test-gem-build

@@ -0,0 +1,39 @@
+#! /usr/bin/env bash
+#
+#  run as part of CI, see gem-install.yml
+#
+if [[ $# -lt 2 ]] ; then
+  echo "usage: $(basename $0) <output_dir> <platform>"
+  exit 1
+fi
+
+OUTPUT_DIR=$1
+BUILD_NATIVE_GEM=$2
+
+test -e /etc/os-release && cat /etc/os-release
+
+if [[ "${BUILD_NATIVE_GEM}" != "ruby" ]] ; then
+  # normally part of rake-compiler-dock runas which we can't easily use in concourse
+  . /etc/rubybashrc
+  ln -s /usr/local/rake-compiler "$HOME"/.rake-compiler
+  export RAKE_EXTENSION_TASK_NO_NATIVE=true
+fi
+
+set -e -x -u
+
+bundle install --local || bundle install
+bundle exec rake set-version-to-timestamp
+
+if [[ "${BUILD_NATIVE_GEM}" == "ruby" ]] ; then
+  # TODO we're only compiling so that we retrieve libxml2/libxslt tarballs, we can do better.
+  bundle exec rake clean compile
+  bundle exec rake gem
+else
+  bundle exec rake gem:${BUILD_NATIVE_GEM}:builder FORCE_CROSS_COMPILING=true
+fi
+
+./scripts/test-gem-file-contents pkg/nokogiri*.gem
+
+mkdir -p ${OUTPUT_DIR}
+cp -v pkg/nokogiri*.gem ${OUTPUT_DIR}
+sha256sum ${OUTPUT_DIR}/*

scripts/test-gem-install

@@ -0,0 +1,41 @@
+#! /usr/bin/env bash
+#
+#  run as part of CI, see gem-install.yml
+#
+if [[ $# -lt 1 ]] ; then
+  echo "usage: $(basename $0) <gems_dir> [install_flags]"
+  exit 1
+fi
+
+GEMS_DIR=$1
+shift
+INSTALL_FLAGS=$*
+
+test -e /etc/os-release && cat /etc/os-release
+
+set -e -x -u
+
+pushd $GEMS_DIR
+
+  gemfile=$(ls *.gem | head -n1)
+  sha256sum ${gemfile}
+  gem install --no-document ${gemfile} -- ${INSTALL_FLAGS}
+  gem list -d nokogiri
+  nokogiri -v
+
+popd
+
+if [ -n "${BUNDLE_APP_CONFIG:-}" ] ; then
+  export BUNDLE_CACHE_PATH="${BUNDLE_APP_CONFIG}/cache"
+fi
+
+bundle install --local || bundle install
+
+rm -rf lib ext # ensure we don't use the local files
+rake test
+
+./scripts/test-gem-installation
+
+# delete the Gemfile because that's confusing to older versions of rubygems (e.g., bionic32)
+rm -f Gemfile Gemfile.lock
+./scripts/test-nokogumbo-compatibility