CI: Support PR Preview

.github/workflows/deploy.yml

@@ -8,6 +8,9 @@ on:
     branches: [ "main" ]
   repository_dispatch:
     types: deploy
+  pull_request:
+    branches:
+      - main
 
 jobs:
   build:
@@ -43,28 +46,17 @@ jobs:
       run: |
         mv out deploy
 
-    - name: GIT Setup Config
+    - name: Upload Site
       shell: bash -l {0}
-      run: |
-        git config user.email "noreply@deploy"
-        git config user.name "Deploy"
-
-    - name: GIT Checkout gh-pages and Add Deploy files
-      shell: bash -l {0}
-      run: |
-        cp deploy/ ../deploy -r
-        git reset --hard
-        git fetch origin
-        git checkout gh-pages
-        rm -rf *
-        mv ../deploy/* .
+      run: ci/upload_site.sh
+      env:
+          GIT_PR_PREVIEW_PRIVATE_SSH_KEY: ${{ secrets.GIT_PR_PREVIEW_PRIVATE_SSH_KEY }}
 
-    - name: GIT Add and Commit
-      shell: bash -l {0}
-      run: |
-        git add .
-        COMMIT_MESSAGE="Deploying on $(date "+%Y-%m-%d %H:%M:%S")"
-        git commit -m "${COMMIT_MESSAGE}"
-
-    - name: GIT Deploy
-      run: git push origin gh-pages
+    - name: Create Deployment Comment
+      if: ${{ github.ref != 'refs/heads/main' && github.event.pull_request.head.repo.name == github.repository }}
+      uses: peter-evans/create-or-update-comment@v2
+      with:
+        issue-number: ${{ github.event.pull_request.number }}
+        body: |
+          Your site is deployed at https://preview.dev.lfortran.org/
+        reactions: 'rocket'

ci/upload_site.sh

@@ -0,0 +1,50 @@
+#/usr/bin/bash
+
+set -ex
+
+git_ref=${GITHUB_REF}
+
+if [[ ${git_ref} == "refs/heads/main" ]]; then
+    # Production version - pipeline triggered from main branch
+    deploy_repo_pull="https://github.com/lfortran/lcompilers_frontend.git"
+    deploy_repo_push="[email protected]:lfortran/lcompilers_frontend.git"
+else
+    # Test version - pipeline triggered from pull request
+    deploy_repo_pull="https://github.com/lfortran/pull_request_preview.git"
+    deploy_repo_push="[email protected]:lfortran/pull_request_preview.git"
+fi
+
+
+mkdir ~/.ssh
+chmod 700 ~/.ssh
+ssh-keyscan github.com >> ~/.ssh/known_hosts
+eval "$(ssh-agent -s)"
+
+D=`pwd`
+
+mkdir $HOME/repos
+cd $HOME/repos
+
+git clone ${deploy_repo_pull} pr_preview
+cd pr_preview
+git fetch origin
+git checkout gh-pages
+rm -rf *
+mv $D/deploy/* .
+
+git config user.email "noreply@deploy"
+git config user.name "Deploy"
+
+git add .
+COMMIT_MESSAGE="Deploying on $(date "+%Y-%m-%d %H:%M:%S")"
+git commit -m "${COMMIT_MESSAGE}"
+
+if [[ ${git_ref} != "refs/heads/main" ]]; then
+    if [[ "${GIT_PR_PREVIEW_PRIVATE_SSH_KEY}" == "" ]]; then
+        echo "Note: GIT_PR_PREVIEW_PRIVATE_SSH_KEY is empty, skipping..."
+        exit 0
+    fi
+    ssh-add <(echo "$GIT_PR_PREVIEW_PRIVATE_SSH_KEY" | base64 -d)
+fi
+
+git push ${deploy_repo_push} gh-pages:gh-pages