ci: reworked CI

.gitlab-ci.yml

 stages:
-  - test
+  - dist
   - build
+  - test
   - deploy
 
-# -- test -------------------
-
-.test: &test
-  before_script:
-    - python -m pip install setuptools
-  script:
-    - python -m pip install .
-    - python -c "import ligo"
-    - python setup.py test
-
-test:2.7:
-  <<: *test
-  image: python:2.7
-
-test:3.4:
-  <<: *test
-  image: python:3.4
+.dist-artifacts: &dist-artifacts
+  after_script:
+    # list files
+    - find dist
+  artifacts:
+    expire_in: 18h
+    paths:
+      - dist
 
-test:3.5:
-  <<: *test
-  image: python:3.5
+# -- dist -------------------
 
-test:3.6:
-  <<: *test
+dist:tarball:
+  <<: *dist-artifacts
+  stage: dist
   image: python:3.6
-
-test:3.7:
-  <<: *test
-  image: python:3.7
+  script:
+    - python -m pip install setuptools
+    - python setup.py sdist bdist_wheel
 
 # -- build ------------------
 
 .build: &build
+  <<: *dist-artifacts
   stage: build
-  artifacts:
-    expire_in: 3h
-    paths:
-      - dist
+  dependencies:
+    - dist:tarball
 
-build:pypi:
+.build:el: &build-rhel
   <<: *build
-  image: python
-  script:
-    - python setup.py sdist bdist_wheel --universal
-
-build:el7:
-  <<: *build
-  image: ligo/base:el7
   before_script:
-    - mkdir -p dist/el7
-    - yum install -yq
-          rpm-build epel-rpm-macros
-          python-rpm-macros
+    # install enough to create a src RPM and parse the build dependencies
+    - yum -y -q install
+          yum-utils
+          rpm-build
+          python34
           python3-rpm-macros
-          python-setuptools
-          python34-setuptools
   script:
-    - python setup.py sdist
-    - rpmbuild -tb dist/ligo-common-*.tar.gz
-    - mv ~/rpmbuild/RPMS/*/python*-ligo-common-*.rpm dist/el7/
-  after_script:
-    - rm -rf dist/*.tar.gz
-
-.build:debian: &build_debian
+    - DIST_NAME=${CI_JOB_NAME#build:rhel:}
+    - mkdir -pv dist/${DIST_NAME}
+    # build src rpm
+    - SRC_RPM=$(rpmbuild -ts dist/ligo-common*.tar.gz | cut -d\  -f2)
+    # install build dependencies for src rpm
+    - yum-builddep -y -q ${SRC_RPM}
+    # build binary rpms
+    - rpmbuild --rebuild ${SRC_RPM}
+    # move things into dist/
+    - mv -v ~/rpmbuild/RPMS/*/python*-ligo-common-*.rpm dist/${DIST_NAME}/
+
+.build:debian: &build-debian
   <<: *build
-  variables:
   before_script:
-    - DIST_PATH="dist/${CI_JOB_NAME##*:}"
-    - mkdir -p ${DIST_PATH}
     - apt-get update -yqq
     - apt-get install -yq
           dpkg-dev
-          debhelper
-          dh-python
-          python-all-dev
-          python-setuptools
-          python3-all-dev
-          python3-setuptools
+          devscripts
   script:
-    - dpkg-buildpackage -b -us -uc
-    - mv ../python*-ligo-common_*.deb ${DIST_PATH}/
-
-build:debian:jessie:
-  <<: *build_debian
-  image: debian:jessie
+    - DIST_NAME=${CI_JOB_NAME#build:debian:}
+    - mkdir -pv dist/${DIST_NAME}
+    # unpack tarball
+    - mkdir -pv build
+    - tar -xvf dist/ligo-common-*.tar.gz -C ./build --strip-components=1
+    - pushd build
+    # install build dependencies
+    - mk-build-deps --tool "apt-get -y" --install --remove
+    # build debian packages
+    - dpkg-buildpackage -us -uc -b
+    # move things into dist/
+    - popd
+    - mv -v {python,python3}-ligo-common_*.deb ligo-common_*.{buildinfo,changes} dist/${DIST_NAME}/
+
+build:rhel:el7:
+  <<: *build-rhel
+  image: ligo/base:el7
 
 build:debian:stretch:
-  <<: *build_debian
-  image: debian:stretch
+  <<: *build-debian
+  image: ligo/base:stretch
+
+# -- test -------------------
+
+.test: &test
+  stage: test
+  image: python
+  dependencies:
+    - dist:tarball
+  before_script:
+    - python -m pip install dist/ligo-common-*.tar.gz
+  script:
+    - python -c "import ligo"
+
+test:python2.7:
+  <<: *test
+  image: python:2.7
+
+test:python3.5:
+  <<: *test
+  image: python:3.5
+
+test:python3.6:
+  <<: *test
+  image: python:3.6
+
+test:python3.7:
+  <<: *test
+  image: python:3.7
 
 # -- deploy -----------------