[pygobject] gitlab-ci: Add a 32bit Ubuntu 16.04 image. Fixes #175

[Christoph Reiter <creiter src gnome org>]

commit cfb3a488f02e50be1fd376d2ea990b00301b1839
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Tue Mar 13 12:56:04 2018 +0100

    gitlab-ci: Add a 32bit Ubuntu 16.04 image. Fixes #175
    
    To make sure everything works with older libraries.

 .gitlab-ci.yml                | 13 ++++++++-----
 .gitlab-ci/Dockerfile.old     | 36 ++++++++++++++++++++++++++++++++++++
 .gitlab-ci/run-docker-old.sh  | 11 +++++++++++
 .gitlab-ci/test-docker-old.sh | 17 +++++++++++++++++
 MANIFEST.in                   |  2 +-
 tests/test_overrides_gtk.py   |  9 +++++++++
 6 files changed, 82 insertions(+), 6 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ce06132c..e4468607 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,8 +1,3 @@
-services:
-  - docker
-
-image: lazka/pygobject:pyenv
-
 stages:
   - build_and_test
   - coverage
@@ -13,6 +8,7 @@ cache:
 
 .defaults: &defaults
   stage: build_and_test
+  image: lazka/pygobject:pyenv
   artifacts:
     paths:
       - coverage/
@@ -32,6 +28,7 @@ cache:
 
 coverage:
   stage: coverage
+  image: lazka/pygobject:pyenv
   artifacts:
     paths:
       - coverage/
@@ -92,3 +89,9 @@ python3.7:
   variables:
     PYENV_VERSION: "3.7.0b2"
   <<: *defaults
+
+xenial-i386-py2:
+  stage: build_and_test
+  image: lazka/pygobject:pyenv-old
+  script:
+   - bash -x ./.gitlab-ci/test-docker-old.sh
diff --git a/.gitlab-ci/Dockerfile.old b/.gitlab-ci/Dockerfile.old
new file mode 100644
index 00000000..fa135de7
--- /dev/null
+++ b/.gitlab-ci/Dockerfile.old
@@ -0,0 +1,36 @@
+FROM i386/ubuntu:xenial
+
+RUN apt-get update && apt-get install -y \
+    autoconf-archive \
+    build-essential \
+    ccache \
+    curl \
+    dbus \
+    gir1.2-gtk-3.0 \
+    git \
+    gobject-introspection \
+    lcov \
+    libcairo2-dev \
+    libffi-dev \
+    libgirepository1.0-dev \
+    libglib2.0-dev \
+    libgtk-3-0 \
+    libtool \
+    locales \
+    python-dev \
+    python-virtualenv \
+    xauth \
+    xvfb \
+    && rm -rf /var/lib/apt/lists/*
+
+ARG HOST_USER_ID=5555
+ENV HOST_USER_ID ${HOST_USER_ID}
+RUN useradd -u $HOST_USER_ID -ms /bin/bash user
+
+USER user
+WORKDIR /home/user
+
+ENV LANG C.UTF-8
+ENV CI true
+
+ENV PATH="/usr/lib/ccache:${PATH}"
diff --git a/.gitlab-ci/run-docker-old.sh b/.gitlab-ci/run-docker-old.sh
new file mode 100755
index 00000000..bdd6e54d
--- /dev/null
+++ b/.gitlab-ci/run-docker-old.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+
+TAG="lazka/pygobject:pyenv-old"
+
+sudo docker build --build-arg HOST_USER_ID="$UID" --tag "${TAG}" \
+    --file "Dockerfile.old" .
+sudo docker run --rm \
+    --volume "$(pwd)/..:/home/user/app" --workdir "/home/user/app" \
+    --tty --interactive "${TAG}" bash
diff --git a/.gitlab-ci/test-docker-old.sh b/.gitlab-ci/test-docker-old.sh
new file mode 100755
index 00000000..74c81c77
--- /dev/null
+++ b/.gitlab-ci/test-docker-old.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+
+python --version
+virtualenv --python=python _venv
+source _venv/bin/activate
+
+# ccache setup
+mkdir -p _ccache
+export CCACHE_BASEDIR="$(pwd)"
+export CCACHE_DIR="${CCACHE_BASEDIR}/_ccache"
+
+# test
+python -m pip install git+https://github.com/pygobject/pycairo.git
+python -m pip install pytest pytest-faulthandler
+xvfb-run -a python setup.py test
diff --git a/MANIFEST.in b/MANIFEST.in
index bddf19a6..e69e3144 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -16,4 +16,4 @@ recursive-include gi *.am *.h
 recursive-include pygtkcompat *.am
 recursive-include tests *.py *.c *.h *.xml *.supp *.am
 recursive-include docs *.rst *.svg LICENSE *.ico *.png *.css *.py *.dia Makefile
-recursive-include .gitlab-ci *.sh *.rst *.py Dockerfile
+recursive-include .gitlab-ci *.sh *.rst *.py Dockerfile*
diff --git a/tests/test_overrides_gtk.py b/tests/test_overrides_gtk.py
index aa55564a..fbfe9cfb 100644
--- a/tests/test_overrides_gtk.py
+++ b/tests/test_overrides_gtk.py
@@ -28,6 +28,14 @@ except ImportError:
     Gdk = None
 
 
+def gtkver():
+    if Gtk is None:
+        return (0, 0, 0)
+    return (Gtk.get_major_version(),
+            Gtk.get_minor_version(),
+            Gtk.get_micro_version())
+
+
 @contextlib.contextmanager
 def realized(widget):
     """Makes sure the widget is realized.
@@ -1988,6 +1996,7 @@ class TestTextBuffer(unittest.TestCase):
         self.assertEqual(buffer.get_property('text'),
                          'first line\nsecond line\n')
 
+    @unittest.skipIf(gtkver() < (3, 20, 0), "broken with older gtk")
     def test_backward_find_char(self):
         buffer = Gtk.TextBuffer()
         buffer.set_text('abc')