travis: Build Debian stable docker image and use it for testing

.dockerignore

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+Dockerfile
+.dockerignore

.travis.yml

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 language: c
 sudo: required
 dist: trusty
+
 before_install:
-    # update package list
-    - sudo apt-get update -qq
     - git clone https://anonscm.debian.org/git/collab-maint/britney2-tests.git britney2-tests
     - git clone https://anonscm.debian.org/git/collab-maint/britney-tests-live-data.git britney2-tests/live-data
     - rm -f .coverage
 
 install:
-    # install build dependencies
-    - sudo apt-get install -qq --no-install-recommends python3 python3-apt python3-yaml python3-coverage python3-nose rsync libclass-accessor-perl
+    # Update docker-engine using Ubuntu 'trusty' apt repo
+    - sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
+    - >
+      echo "deb https://apt.dockerproject.org/repo ubuntu-trusty main" |
+       sudo tee -a /etc/apt/sources.list
+    - sudo apt-get update
+    - >
+      sudo apt-get -o Dpkg::Options::="--force-confdef" \
+       -o Dpkg::Options::="--force-confold" --assume-yes install docker-engine
+    - docker version
+
+    - docker pull debian:stable
+    - docker build --tag=britney .
 
 script:
-    - nosetests3 -v --with-coverage
-    - britney2-tests/bin/runtests ./ci/britney-coverage.sh britney2-tests/t test-out
-    - britney2-tests/bin/runtests ./britney.py britney2-tests/live-data test-out-live-data
-after_success:
-  - python3-coverage report
-  - python3-coverage report -m
-  - python3-coverage xml -i
-  - bash <(curl -s https://codecov.io/bash)
+    - docker run britney /bin/sh -c "export CI=true ; ci/run-everything-and-upload-to-codecov.io.sh"
+
 #notifications:
 #  email: false

Dockerfile

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+FROM debian:stable
+WORKDIR /britney
+ADD . /britney
+RUN apt-get update && apt-get install --no-install-recommends --assume-yes python3 python3-apt python3-yaml python3-coverage python3-nose rsync libclass-accessor-perl libdpkg-perl curl

ci/run-everything-and-upload-to-codecov.io.sh

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+#!/bin/bash
+
+set -e
+
+err=0
+
+nosetests3 -v --with-coverage || err=$?
+echo
+echo
+britney2-tests/bin/runtests ./ci/britney-coverage.sh britney2-tests/t test-out || err=$?
+echo
+echo
+britney2-tests/bin/runtests ./britney.py britney2-tests/live-data test-out-live-data-1 live-2011-12-13 || err=$?
+echo
+britney2-tests/bin/runtests ./britney.py britney2-tests/live-data test-out-live-data-2 live-2011-12-20 || err=$?
+echo
+britney2-tests/bin/runtests ./britney.py britney2-tests/live-data test-out-live-data-3 live-2012-01-04 || err=$?
+echo
+britney2-tests/bin/runtests ./britney.py britney2-tests/live-data test-out-live-data-4 live-2012-05-09 || err=$?
+echo
+britney2-tests/bin/runtests ./britney.py britney2-tests/live-data test-out-live-data-5 live-2016-04-11 || err=$?
+echo
+
+if [ $err = 0 ] ; then
+    python3-coverage report || true
+    echo
+    python3-coverage report -m || true
+    echo
+    python3-coverage xml -i || true
+    echo
+    bash <(curl -s https://codecov.io/bash) || true
+fi
+
+exit $err