[buildstream] 01/01: .gitlab-ci.yml: Publish to PyPI when new tags are pushed

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commit 865d5f4357a5041163d4cbc0c4b359b280edae5a
Author: Chandan Singh <csing...@bloomberg.net>
AuthorDate: Fri Aug 24 22:15:00 2018 +0100

    .gitlab-ci.yml: Publish to PyPI when new tags are pushed
    
    Add a new CI job to publish souce distribution archive to PyPi any time
    new tags are pushed to the repository. Releases will be made on
    test.pypi.org first.
    
    Part of https://gitlab.com/BuildStream/buildstream/issues/587.
---
 .gitlab-ci.yml | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4e8603a..812d5aa 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -14,6 +14,9 @@ variables:
   PYTEST_ADDOPTS: "--color=yes"
   INTEGRATION_CACHE: "${CI_PROJECT_DIR}/cache/integration-cache"
   TEST_COMMAND: 'python3 setup.py test --index-url invalid://uri --addopts 
--integration'
+  TEST_PYPI_UPLOAD_URL: "https://test.pypi.org/legacy/";
+  TEST_PYPI_INDEX_URL: "https://test.pypi.org/simple/";
+  PYPI_UPLOAD_URL: "https://upload.pypi.org/legacy/";
 
 #####################################################
 #                  Prepare stage                    #
@@ -323,3 +326,33 @@ pages:
   - master
   except:
   - schedules
+
+# Release to PyPI, only for tags.
+#
+# TODO: To begin with, we only upload to test.pypi. Later we should also push
+# to real PyPI after verifying that it can be installed correctly.
+#
+pypi_release:
+  stage: post
+  dependencies:
+  - source_dist
+  script:
+  - |
+    if [[ ! "$CI_COMMIT_TAG" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+        echo "Not processing non-numeric tag: $CI_COMMIT_TAG for PyPI"
+        exit
+    fi
+    minor_version="$(echo "$CI_COMMIT_TAG" | cut -d. -f2)"
+    if [[ "$(( minor_version %2 ))" -ne 0 ]]; then
+        echo "Not uploading development release: $CI_COMMIT_TAG to PyPI"
+        exit
+    fi
+
+    # Credentials for PyPI are defined in secret CI variables "TWINE_USERNAME"
+    # and "TWINE_PASSWORD".
+    pip3 install twine
+    twine upload --repository-url "$TEST_PYPI_UPLOAD_URL" dist/*.tar.gz
+    pip3 install --extra-index-url "$TEST_PYPI_INDEX_URL" 
"BuildStream==$CI_COMMIT_TAG"
+    bst --version
+  only:
+  - tags