Add configuration to build and run tests in GitHub Actions

Copy the tests that are currently run on Travis CI, in order to no
longer depends on Travis CI.

For more context: Travis-CI is changing its offer, as documented in
https://docs.travis-ci.com/user/migrate/open-source-repository-migration
and SELinuxProject moved to https://travis-ci.com
https://lore.kernel.org/selinux/CAFqZXNspH6MmB-o0wtJJwj-p0DKKrH-ZjfW2YkF_yQS_gCBwqQ@mail.gmail.com/T/#t

Unfortunately the credits for opensource projects are quite limited, and
require interaction with Travis CI support (which was quite unresponsive
when I contacted them for other opensource projects I am maintaining).

Create a configuration for Github Actions that duplicates most Travis CI
checks.

* macOS check has not yet been converted, but GitHub Actions support
  this platform so this can be done in another patch (and in another
  configuration in .github/workflows ?).

* KVM support is not available on GitHub Actions so running SELinux
  testsuite in a Fedora VM is not possible. This is a known issue
  (https://github.com/actions/virtual-environments/issues/183) and other
  projects seem to face the same issue (for example
  https://github.com/opencontainers/runc/issues/2670).

This configuration has been tested on
https://github.com/fishilico/selinux/actions/runs/380579153

Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>

.github/workflows/run_tests.yml

@@ -0,0 +1,189 @@
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [gcc, clang]
+        python-ruby-version:
+          - {python: 3.8, ruby: 2.7}
+          - {python: 3.8, ruby: 2.7, other: test-flags-override}
+          - {python: 3.8, ruby: 2.7, other: test-debug}
+          - {python: 3.8, ruby: 2.7, other: linker-bfd}
+          - {python: 3.8, ruby: 2.7, other: linker-gold}
+          # Test several Python versions with the latest Ruby version
+          - {python: 3.7, ruby: 2.7}
+          - {python: 3.6, ruby: 2.7}
+          - {python: 3.5, ruby: 2.7}
+          - {python: pypy3, ruby: 2.7}
+          # Test several Ruby versions with the latest Python version
+          - {python: 3.8, ruby: 2.6}
+          - {python: 3.8, ruby: 2.5}
+          - {python: 3.8, ruby: 2.4}
+        exclude:
+          - compiler: clang
+            python-ruby-version: {python: 3.8, ruby: 2.7, other: linker-bfd}
+          - compiler: clang
+            python-ruby-version: {python: 3.8, ruby: 2.7, other: linker-gold}
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-ruby-version.python }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-ruby-version.python }}
+
+    - name: Set up Ruby ${{ matrix.python-ruby-version.ruby }}
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.python-ruby-version.ruby }}
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get update -qq
+        sudo apt-get install -qqy \
+            bison \
+            clang \
+            flex \
+            gawk \
+            gettext \
+            libaudit-dev \
+            libcap-dev \
+            libcap-ng-dev \
+            libcunit1-dev \
+            libdbus-glib-1-dev \
+            libpcre3-dev \
+            python3-dev \
+            python-dev \
+            ruby-dev \
+            swig \
+            xmlto
+
+        pip install flake8
+
+    - name: Configure the environment
+      run: |
+        DESTDIR=/tmp/destdir
+        echo "PYTHON=python" >> $GITHUB_ENV
+        echo "RUBY=ruby" >> $GITHUB_ENV
+        echo "DESTDIR=$DESTDIR" >> $GITHUB_ENV
+
+        CC=${{ matrix.compiler }}
+        if [ "${{ matrix.python-ruby-version.other }}" = "linker-bfd" ] ; then
+            CC="$CC -fuse-ld=bfd"
+        elif [ "${{ matrix.python-ruby-version.other }}" = "linker-gold" ] ; then
+            CC="$CC -fuse-ld=gold"
+        fi
+        echo "CC=$CC" >> $GITHUB_ENV
+
+        EXPLICIT_MAKE_VARS=
+        if [ "${{ matrix.python-ruby-version.other }}" = "test-flags-override" ] ; then
+            # Test that overriding CFLAGS, LDFLAGS and other variables works fine
+            EXPLICIT_MAKE_VARS="CFLAGS=-I$DESTDIR/usr/include LDFLAGS=-L$DESTDIR/usr/lib LDLIBS= CPPFLAGS="
+        elif [ "${{ matrix.python-ruby-version.other }}" = "test-debug" ] ; then
+            # Test hat debug build works fine
+            EXPLICIT_MAKE_VARS="DEBUG=1"
+        else
+            EXPLICIT_MAKE_VARS=
+        fi
+        echo "EXPLICIT_MAKE_VARS=${EXPLICIT_MAKE_VARS}" >> $GITHUB_ENV
+
+        # Find files in order of pkgconf to be able to find Python.h
+        # For example with Python 3.5:
+        # * python is located at /opt/hostedtoolcache/Python/3.5.10/x64/bin/python
+        # * sys.prefix is /opt/hostedtoolcache/Python/3.5.10/x64
+        # * Python.h is located at /opt/hostedtoolcache/Python/3.5.10/x64/include/python3.5m/Python.h
+        # * python-3.5.pc is located at /opt/hostedtoolcache/Python/3.5.10/x64/lib/pkgconfig/python-3.5.pc
+        PYTHON_SYS_PREFIX="$(python -c 'import sys;print(sys.prefix)')"
+        echo "PKG_CONFIG_PATH=${PYTHON_SYS_PREFIX}/lib/pkgconfig" >> $GITHUB_ENV
+
+        if [ "${{ matrix.python-ruby-version.python }}" = "pypy3" ] ; then
+            # PyPy does not provide a config file for pkg-config
+            # libpypy-c.so is provided in bin/libpypy-c.so for PyPy and bin/libpypy3-c.so for PyPy3
+            echo "PYINC=-I${PYTHON_SYS_PREFIX}/include" >> $GITHUB_ENV
+            echo "PYLIBS=-L${PYTHON_SYS_PREFIX}/bin -lpypy3-c" >> $GITHUB_ENV
+        fi
+
+        # Display the final environment file, for debugging purpose
+        cat $GITHUB_ENV
+
+    - name: Download and install refpolicy headers for sepolgen tests
+      run: |
+        curl --location --retry 10 -o refpolicy.tar.bz2 https://github.com/SELinuxProject/refpolicy/releases/download/RELEASE_2_20180701/refpolicy-2.20180701.tar.bz2
+        tar -xvjf refpolicy.tar.bz2
+        sed -e "s,^PREFIX :=.*,PREFIX := $DESTDIR/usr," -i refpolicy/support/Makefile.devel
+        sudo make -C refpolicy install-headers clean
+        sudo mkdir -p /etc/selinux
+        echo 'SELINUXTYPE=refpolicy' | sudo tee /etc/selinux/config
+        echo 'SELINUX_DEVEL_PATH = /usr/share/selinux/refpolicy' | sudo tee /etc/selinux/sepolgen.conf
+        sed -e "s,\"\(/usr/bin/[cs]\),\"$DESTDIR\1," -i python/sepolgen/src/sepolgen/module.py
+        rm -r refpolicy refpolicy.tar.bz2
+
+    - name: Display versions
+      run: |
+        echo "::group::Compiler ($CC):"
+        $CC --version
+        echo "::endgroup::"
+        echo "::group::Python ($(which "$PYTHON")):"
+        $PYTHON --version
+        echo "::endgroup::"
+        echo "::group::Ruby ($(which "$RUBY")):"
+        $RUBY --version
+        echo "::endgroup::"
+
+    - name: Run tests
+      run: |
+        echo "::group::make install"
+        make -j$(nproc) install $EXPLICIT_MAKE_VARS -k
+        echo "::endgroup::"
+        echo "::group::make install-pywrap"
+        make -j$(nproc) install-pywrap $EXPLICIT_MAKE_VARS -k
+        echo "::endgroup::"
+        echo "::group::make install-rubywrap"
+        make -j$(nproc) install-rubywrap $EXPLICIT_MAKE_VARS -k
+        echo "::endgroup::"
+
+        # Now that everything is installed, run "make all" to build everything which may have not been built
+        echo "::group::make all"
+        make -j$(nproc) all $EXPLICIT_MAKE_VARS -k
+        echo "::endgroup::"
+
+        # Set up environment variables for the tests and show variables (to help debugging issues)
+        echo "::group::Environment variables"
+        . ./scripts/env_use_destdir
+        echo "LD_LIBRARY_PATH=$LD_LIBRARY_PATH"
+        echo "PATH=$PATH"
+        echo "PYTHONPATH=$PYTHONPATH"
+        echo "RUBYLIB=$RUBYLIB"
+        echo "::endgroup::"
+
+        # Run tests
+        echo "::group::make test"
+        make test $EXPLICIT_MAKE_VARS
+        echo "::endgroup::"
+
+        # Test Python and Ruby wrappers
+        echo "::group::Test Python and Ruby wrappers"
+        $PYTHON -c 'import selinux;import selinux.audit2why;import semanage;print(selinux.is_selinux_enabled())'
+        $RUBY -e 'require "selinux";require "semanage";puts Selinux::is_selinux_enabled()'
+        echo "::endgroup::"
+
+        # Run Python linter, but not on the downloaded refpolicy
+        echo "::group::scripts/run-flake8"
+        ./scripts/run-flake8
+        echo "::endgroup::"
+
+        echo "::group::Test .gitignore and make clean distclean"
+        # Remove every installed files
+        rm -rf "$DESTDIR"
+        # Test that "git status" looks clean, or print a clear error message
+        git status --short | sed -n 's/^??/error: missing .gitignore entry for/p' | (! grep '^')
+        # Clean up everything and show which file needs to be added to "make clean"
+        make clean distclean $EXPLICIT_MAKE_VARS
+        git ls-files --ignored --others --exclude-standard | sed 's/^/error: "make clean distclean" did not remove /' | (! grep '^')
+        echo "::endgroup::"