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.github/workflows/on-release.yml

@@ -1,59 +1,99 @@
-name: build and test image
+name: on release
+
+# The workflow is split into several sub jobs
+# 1. prepare-tags: 
+#    This step finds the latest mbed-os version (in terms of product version not date)
+#    and generates a unique dev version for the image. 
+#    The DEV docker tag takes the format of dev-<MBED_OS_VERSION>-<human readable date>-<UUID>
+# 2. build-container:
+#    The dev version of image is built here and pushed to docker hub.
+#    When multiarch image is built docker buildx doesn't support exporting to docker
+#    Hence, need to push to a registry (dockerhub).
+# 3. test-container:
+#    This tests the dev docker images
+# 4. deploy-container
+#    At this point, docker image marked as "dev" is ready to tag as "prod"
+#    Also, deletes the dev tag
+#    The dev images that didn't succeed is kept in docker hub for troubleshooting purposes.
+#    Published docker tags are:
+#    1. <MBED_OS_VERSION>-latest
+#    2. <MBED_OS_VERSION>-<human readable date>
+#    3. latest
+#    This can be move with another workflow
 
 on:
-  pull_request:
-    branches: [ master ]
-    paths:
-      - docker_images/mbed-os-env/**
-      - .github/workflows/**
+  schedule:
+    - cron:  '15 4 * * *'
+
+  push:
+    # on push master build a new image master-latest for example application
+    # on push 5.15 build a new image 5.15-latest for example application
+    # on release 5.15 build a new image 5.15-stable for example application
+    # on manul 
+    # at night ??
+    tags:
+      - '*'
+    # paths:
+    #   - docker_images/mbed-os-env/**
+    #   - .github/workflows/**
 
-jobs:
+  workflow_dispatch:
 
-  build-container:
+jobs:
+  prepare-tags:
     runs-on: ubuntu-latest
-
 
-    strategy:
-      matrix:
-        platform: [linux/amd64, linux/arm64]
     steps:
-
       - 
-        name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        name: Extract branch name
+        shell: bash
+        run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        id: extract_branch
 
-      - 
-        name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-
       -
         name: Checkout
         uses: actions/checkout@v2
-
-
-      # cache documentation: https://github.com/docker/build-push-action/blob/master/docs/advanced/cache.md
-      -
-        name: Build with remote cache
-        uses: docker/build-push-action@v2
-        id: docker_build_dev
         with:
-          context: .
-          platforms: ${{ matrix.platform }}
-          file: ./mbed-os-env/Dockerfile
-          load: true
-          tags: mbed-os-env:a_pr_test
-          cache-from: type=registry,ref=mbedos/mbed-os-env:latest
+          fetch-depth: 0
+
+      - 
+        name: Find the latest tag on the branch
+        id: mbed_os_version
+        shell: bash
+        run: |
+          value=`git describe --tags --abbrev=0  --match mbed-os-*.[0-9]`
+          echo "TAG is $value"
+          echo "::set-output name=tag::$value"
+
+      - 
+        name: Set UUID
+        id: generate-uuid
+        uses: filipstefansson/uuid-action@v1
+
+# set docker tags we are building, and intending to publish
+# dev-tag is temporary for testing purpose. This should be considered as unstable.
+# dated-tag is created for versioning purpose
+# prod-tag-latest could be used by customers, CI etc for keeping up to date
+      - 
+        name: Get build information
+        shell: bash
+        run: |
+          mkdir -p build_info
+          date=$(date +"%Y.%m.%dT%H.%M.%S")
+          echo dev-${{ steps.extract_branch.outputs.branch }}-${date}-${{ steps.generate-uuid.outputs.uuid }} > build_info/dev_tag
+          echo ${{ steps.extract_branch.outputs.branch }}-${date} > build_info/prod_tag_dated
+          echo ${{ steps.extract_branch.outputs.branch }}-latest > build_info/prod_tag_latest
+          echo ${{ steps.extract_branch.outputs.branch }} > build_info/mbed_os_version
+          # echo dev-${{ steps.mbed_os_version.outputs.tag }}-${date}-${{ steps.generate-uuid.outputs.uuid }} > build_info/dev_tag
+          # echo ${{ steps.mbed_os_version.outputs.tag }}-${date} > build_info/prod_tag_dated
+          # echo ${{ steps.mbed_os_version.outputs.tag }}-latest > build_info/prod_tag_latest
+          # echo ${{ steps.mbed_os_version.outputs.tag }} > build_info/mbed_os_version
 
+      # archiving and unarchiving are github actions ways to pass variables between jobs    
       - 
-        name: test the container
-        id: test
-        uses: addnab/docker-run-action@v2
+        name: Archive information 
+        uses: actions/upload-artifact@v2
         with:
-          options: -v ${{ github.workspace }}:/work -w=/work
-          image: mbed-os-env:a_pr_test
-          shell: bash
-          run: |
-            set -e
-            echo "::set-output name=STATUS::failed"
-            uname -m
-            ./mbed-os-env/test.sh 
+          name: build-info
+          path: build_info
+