Set up CI with Azure Pipelines

We only run tests for macOS, since Linux and Windows are already tested on our
other CI.

The code is mirrored to Azure only if the GitLab CI environment variable
SSH_PRIVATE_KEY_AZURE is set. Otherwise the Azure build are skipped.

.gitlab-ci.yml

@@ -37,6 +37,19 @@ mirror:
   only:
     - master
 
+# Azure
+azure:
+  stage: tarball
+  image: registry.gitlab.com/lfortran/ci-images:full-1.2.0
+  script:
+    - export PATH="$HOME/conda_root/bin:$PATH"
+    - sudo apt-get update
+    - sudo apt-get install -yq --no-install-recommends openssh-client git
+    - ci/azure_mirror.sh
+  only:
+    variables:
+      - $SSH_PRIVATE_KEY_AZURE
+
 
 # Test full dependencies when a C compiler is available and used for linking
 full:

azure-pipelines.yml

@@ -0,0 +1,35 @@
+# Azure Pipelines CI
+# Documentation of the syntax:
+# https://aka.ms/yaml
+
+jobs:
+#  - job: Linux
+#    pool:
+#      vmImage: 'Ubuntu-16.04'
+#    steps:
+#    - script: echo Hello, world!
+
+  - job: macOS
+    pool:
+      # List of preinstalled software on the macOS image:
+      # https://github.com/Microsoft/azure-pipelines-image-generation/blob/master/images/macos/macos-Readme.md
+      vmImage: 'macOS-10.13'
+    steps:
+    - bash: echo "##vso[task.prependpath]$CONDA/bin"
+      displayName: Add conda to PATH
+    - bash: sudo chown -R $USER $CONDA
+      displayName: Take ownership of conda installation
+    - script: ci/azure_install_macos.sh
+      displayName: 'Install prerequisites'
+
+    - script: |
+        echo Add other tasks to build, test, and deploy your project.
+        echo See https://aka.ms/yaml
+      displayName: 'Run a multi-line script'
+
+#  - job: Windows
+#    pool:
+#      vmImage: 'vs2017-win2016'
+#    steps:
+#    - script: echo Hello, world!
+#      displayName: 'Run a one-line script'

ci/azure_install_macos.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -ex
+
+conda config --set always_yes yes --set changeps1 no
+conda info -a
+conda update -q conda
+conda install python=3.7 pytest llvmlite prompt_toolkit
+pip install antlr4-python3-runtime
+
+python grammar/asdl_py.py
+python grammar/asdl_py.py grammar/ASR.asdl lfortran/asr/asr.py ..ast.utils
+
+cd grammar
+curl -O https://www.antlr.org/download/antlr-4.7-complete.jar
+java -cp antlr-4.7-complete.jar org.antlr.v4.Tool -Dlanguage=Python3 -no-listener -visitor fortran.g4 -o ../lfortran/parser
+cd ..
+
+CFLAGS="-Wall -g -fPIC"
+gcc $CFLAGS -o lfort_intrinsics.o -c lfort_intrinsics.c
+ar rcs liblfortran.a lfort_intrinsics.o
+gcc -shared -o liblfortran.so lfort_intrinsics.o
+mkdir -p share/lfortran/lib
+mv liblfortran.a share/lfortran/lib/
+mv liblfortran.so share/lfortran/lib/
+
+pytest

ci/azure_mirror.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+set -e
+set -x
+
+mkdir ~/.ssh
+chmod 700 ~/.ssh
+ssh-keyscan ssh.dev.azure.com >> ~/.ssh/known_hosts
+
+eval "$(ssh-agent -s)"
+
+set +x
+if [[ "${SSH_PRIVATE_KEY_AZURE}" == "" ]]; then
+    echo "Error: SSH_PRIVATE_KEY_AZURE is empty."
+    exit 1
+fi
+# Generate the private/public key pair using:
+#
+#     ssh-keygen -f deploy_key -N ""
+#
+# then set the $SSH_PRIVATE_KEY_AZURE environment variable in the GitLab-CI to
+# the base64 encoded private key:
+#
+#     cat deploy_key | base64 -w0
+#
+# and add the public key `deploy_key.pub` into the target git repository (with
+# write permissions).
+
+ssh-add <(echo "$SSH_PRIVATE_KEY_AZURE" | base64 -d)
+set -x
+
+pwd
+git branch -D $CI_COMMIT_REF_NAME || echo ok
+git checkout -t origin/$CI_COMMIT_REF_NAME
+git show-ref
+git remote -v
+git push git@ssh.dev.azure.com:v3/lfortran/lfortran/lfortran +$CI_COMMIT_REF_NAME:$CI_COMMIT_REF_NAME