[WIP] Github action for emscripten nightly builds

.github/workflows/pull-soljson.yml

@@ -0,0 +1,118 @@
+name: Emscripten nightly build + solc-bin push
+
+on:
+  schedule:
+    # Run once a day, at midnight
+    - cron: '0 0 * * *'
+
+jobs:
+  build-emscripten:
+    runs-on: ubuntu-latest
+    outputs:
+      nightly-version: ${{ env.NIGHTLY_VERSION }}
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          repository: 'ethereum/solidity'
+          ref: 'develop'
+
+      - name: Build soljson.js
+        run: |
+          # Note that this script will spawn and build inside a docker image (which works just fine in github actions).
+          scripts/build_emscripten.sh
+
+      - name: Get nightly version
+        id: nightly-version
+        run: |
+          last_commit_timestamp=$(git log -1 --date=iso --format=%ad HEAD)
+          last_commit_date=$(date --date="$last_commit_timestamp" --utc +%Y.%-m.%-d)
+          last_commit_hash=$(git rev-parse --short=8 HEAD)
+          solidity_version=$(scripts/get_version.sh)
+          nightly_version="v${solidity_version}-nightly.${last_commit_date}+commit.${last_commit_hash}"
+
+          echo "::set-env name=NIGHTLY_VERSION::${nightly_version}"
+
+      - name: Upload soljson.js as an artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: soljson.js
+          path: upload/soljson.js
+
+  commit-soljson:
+    runs-on: ubuntu-latest
+    needs: build-emscripten
+
+    env:
+      COMMITTER_NAME: emscripten nightly action
+      # TODO: Set a proper e-mail address
+      COMMITTER_EMAIL: solidity@example.com
+      TARGET_BRANCH: master
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      NIGHTLY_VERSION: ${{ needs.build-emscripten.outputs.nightly-version }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Make sure that the working copy is clean
+        run: |
+          echo "::debug::$(git status)"
+          test -z "$(git status --porcelain)" && exit 1
+
+      - name: Check if the nightly already exists
+        run: |
+          version_already_exists=$(git ls-files "bin/soljson-$NIGHTLY_VERSION.js" | sed q1 || echo true && true)
+          echo "::set-env name=VERSION_ALREADY_EXISTS::${version_already_exists}"
+
+      - name: Download soljson.js artifact
+        uses: actions/download-artifact@v2
+        if: "!env.VERSION_ALREADY_EXISTS"
+        with:
+          name: soljson.js
+          path: bin/
+
+      - name: Move soljson.js to the target location and stage it for commit
+        if: "!env.VERSION_ALREADY_EXISTS"
+        run: |
+          mv bin/soljson.js bin/soljson-${{ env.NIGHTLY_VERSION }}.js
+
+          # Staging before running the update script to detect any possible damage caused by it
+          git add "bin/soljson-$NIGHTLY_VERSION.js"
+
+      - name: Install dependencies of the update script using npm
+        if: "!env.VERSION_ALREADY_EXISTS"
+        run: |
+          npm config set package-lock false
+          npm install
+
+      - name: Run the script that updates the file lists
+        if: "!env.VERSION_ALREADY_EXISTS"
+        run: |
+          npm run update
+
+      - name: Commit the nightly binary and updated lists
+        if: "!env.VERSION_ALREADY_EXISTS"
+        run: |
+          git add bin/soljson-nightly.js
+          git add bin/list.json
+          git add bin/list.js
+          git add bin/list.txt
+
+          git config --local user.name "$COMMITTER_NAME"
+          git config --local user.email "$COMMITTER_EMAIL"
+          git commit -m "Nightly build ${NIGHTLY_VERSION}"
+
+      - name: Remove untracked files
+        if: "!env.VERSION_ALREADY_EXISTS"
+        run: |
+          rm -r node_modules/
+
+      - name: Make sure that no other files were modified
+        run: |
+          echo "::debug::$(git status)"
+          test -z "$(git status --porcelain)" && exit 1
+
+      - name: Push the commit
+        if: "!env.VERSION_ALREADY_EXISTS"
+        run: |
+          git push origin "$TARGET_BRANCH"