Migrate to Cloudflare Workers & Add Advanced Linux Programming Blog Posts #75
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Created an in-depth technical guide covering: - Signal types and their purposes - Signal handling implementation examples - Best practices for signal management - Real-world applications like daemon management - Debugging techniques for signal-related issues 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
Created an in-depth technical guide covering: - Fundamental concepts of big-endian vs little-endian - Runtime and compile-time detection methods - Network programming implications and conversions - Binary file format considerations - Performance implications for different operations - Debugging techniques and common issues - Best practices for cross-platform development 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
Added in-depth technical guides covering: 1. Process Forking in Linux - Fork system call fundamentals - Process lifecycle management - Exec family and process transformation - Advanced patterns and IPC - Real-world shell implementation 2. Linux System Calls Deep Dive - Architecture and implementation - Essential categories (process, file, memory, signals, network) - Performance considerations - Security with seccomp and capabilities - Debugging techniques 3. Semaphores and Synchronization Patterns - POSIX and System V implementations - Producer-consumer, readers-writers patterns - Barriers and rate limiting - Performance analysis - Real-world applications All posts include extensive code examples, best practices, and practical solutions. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
Created additional in-depth technical guides: 1. Mastering POSIX Threads - Advanced thread creation and management - Lock-free programming techniques - Thread pools and work stealing - Memory ordering and cache optimization 2. Linux IPC Mastery - Pipes, FIFOs, and message queues - Shared memory and performance optimization - Advanced IPC patterns and benchmarking - Zero-copy techniques 3. Makefile Mastery - Advanced pattern rules and functions - Parallel build optimization - Cross-platform portability - Integrated testing and CI 4. Linux Memory Management Deep Dive - Virtual memory architecture - Custom allocators and memory pools - NUMA awareness and huge pages - Performance optimization techniques 5. Linux Debugging Mastery - Advanced GDB techniques and scripting - strace system call analysis - Performance profiling with perf - Production debugging strategies All posts include extensive code examples, performance analysis, and real-world applications. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
…groups - Cover Linux namespaces (PID, NET, UTS, IPC, MNT, USER, CGROUP, TIME) - Detailed cgroups v1 and v2 resource management examples - Complete container runtime implementation from scratch - Advanced networking setup with veth pairs and bridges - Security hardening with capabilities and seccomp filters - Container image management and overlay filesystems - Simple container orchestration system - Practical code examples for all major container technologies 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
- Advanced ELF Binary Analysis and Reverse Engineering - Advanced Kernel Debugging Techniques - Linux Performance Profiling and Optimization - Linux Filesystem Internals and Optimization - Real-Time Linux Programming - Linux Security Exploit Development and Mitigation Each post provides comprehensive technical content with practical code examples, advanced techniques, and real-world applications for systems programmers. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
This commit migrates the support.tools website from Kubernetes to Cloudflare Workers for improved performance, reduced costs, and simplified operations. Key changes: - Add Cloudflare Workers configuration (wrangler.toml) - Create minimal worker script for static asset serving - Update Makefile with Workers deployment commands - Add GitHub Actions workflow for automated deployments - Include comprehensive migration and logging documentation - Configure Workers Logs for monitoring - Update .gitignore for Wrangler files Benefits: - Free hosting for static assets (unlimited requests) - Global CDN distribution (~50ms worldwide latency) - No infrastructure to manage - Automatic scaling - Simplified deployment process All environments are now live on Cloudflare Workers: - https://dev.support.tools - https://mst.support.tools - https://qas.support.tools - https://tst.support.tools - https://stg.support.tools - https://support.tools The original Kubernetes deployment remains intact as a fallback option. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
This commit adds comprehensive technical blog posts covering: - Advanced Linux system programming topics - Kernel development and debugging - Networking and distributed systems - Real-time and embedded systems - Container and virtualization technologies - Performance optimization techniques - Security and cryptography programming - Audio, graphics, and multimedia programming - Database and storage systems - Compiler and runtime development Each post provides in-depth technical content with code examples, best practices, and real-world implementation guidance. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
![github-advanced-security[bot]](https://avatars.githubusercontent.com/in/57789?s=60&v=4){kind=small}
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| runs-on: ubuntu-latest | ||
| if: ${{ github.event.workflow_run.conclusion == 'success' || github.event.workflow_run.conclusion == 'failure' }} | ||
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||
| steps: | ||
| - name: Get workflow details | ||
| id: workflow-details | ||
| run: | | ||
| echo "status=${{ github.event.workflow_run.conclusion }}" >> $GITHUB_OUTPUT | ||
| echo "run_id=${{ github.event.workflow_run.id }}" >> $GITHUB_OUTPUT | ||
| echo "actor=${{ github.event.workflow_run.actor.login }}" >> $GITHUB_OUTPUT | ||
| echo "branch=${{ github.event.workflow_run.head_branch }}" >> $GITHUB_OUTPUT | ||
|
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||
| # Uncomment and configure for Slack notifications | ||
| # - name: Slack Notification | ||
| # if: ${{ vars.SLACK_WEBHOOK_URL != '' }} | ||
| # uses: 8398a7/action-slack@v3 | ||
| # with: | ||
| # status: ${{ github.event.workflow_run.conclusion }} | ||
| # webhook_url: ${{ secrets.SLACK_WEBHOOK_URL }} | ||
| # text: | | ||
| # Deployment ${{ github.event.workflow_run.conclusion == 'success' && '✅ succeeded' || '❌ failed' }} | ||
| # Branch: ${{ steps.workflow-details.outputs.branch }} | ||
| # Actor: ${{ steps.workflow-details.outputs.actor }} | ||
| # Run: https://github.com/${{ github.repository }}/actions/runs/${{ steps.workflow-details.outputs.run_id }} | ||
|
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||
| # Uncomment and configure for Discord notifications | ||
| # - name: Discord Notification | ||
| # if: ${{ vars.DISCORD_WEBHOOK_URL != '' }} | ||
| # uses: sarisia/actions-status-discord@v1 | ||
| # with: | ||
| # webhook: ${{ secrets.DISCORD_WEBHOOK_URL }} | ||
| # status: ${{ github.event.workflow_run.conclusion }} | ||
| # title: "Support Tools Deployment" | ||
| # description: | | ||
| # **Status**: ${{ github.event.workflow_run.conclusion == 'success' && '✅ Success' || '❌ Failed' }} | ||
| # **Branch**: ${{ steps.workflow-details.outputs.branch }} | ||
| # **Triggered by**: ${{ steps.workflow-details.outputs.actor }} | ||
| # url: "https://github.com/${{ github.repository }}/actions/runs/${{ steps.workflow-details.outputs.run_id }}" | ||
|
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| # Uncomment and configure for email notifications | ||
| # - name: Send email notification | ||
| # if: ${{ github.event.workflow_run.conclusion == 'failure' }} | ||
| # uses: dawidd6/action-send-mail@v3 | ||
| # with: | ||
| # server_address: smtp.gmail.com | ||
| # server_port: 587 | ||
| # username: ${{ secrets.MAIL_USERNAME }} | ||
| # password: ${{ secrets.MAIL_PASSWORD }} | ||
| # subject: "❌ Support Tools Deployment Failed" | ||
| # to: [email protected] | ||
| # from: GitHub Actions | ||
| # body: | | ||
| # Deployment to Cloudflare Workers has failed. | ||
| # | ||
| # Branch: ${{ steps.workflow-details.outputs.branch }} | ||
| # Actor: ${{ steps.workflow-details.outputs.actor }} | ||
| # | ||
| # View details: https://github.com/${{ github.repository }}/actions/runs/${{ steps.workflow-details.outputs.run_id }} | ||
|
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| - name: Create GitHub Issue on Failure | ||
| if: ${{ github.event.workflow_run.conclusion == 'failure' }} | ||
| uses: actions/github-script@v7 | ||
| with: | ||
| script: | | ||
| const issue = await github.rest.issues.create({ | ||
| owner: context.repo.owner, | ||
| repo: context.repo.repo, | ||
| title: `🚨 Deployment Failed - ${new Date().toISOString().split('T')[0]}`, | ||
| body: `## Deployment Failure | ||
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| The Cloudflare Workers deployment has failed. | ||
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| **Details:** | ||
| - Branch: \`${{ steps.workflow-details.outputs.branch }}\` | ||
| - Triggered by: @${{ steps.workflow-details.outputs.actor }} | ||
| - Workflow Run: [View Details](https://github.com/${{ github.repository }}/actions/runs/${{ steps.workflow-details.outputs.run_id }}) | ||
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| **Action Required:** | ||
| 1. Check the workflow logs | ||
| 2. Fix the issue | ||
| 3. Re-run the deployment | ||
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| cc: @${{ steps.workflow-details.outputs.actor }}`, | ||
| labels: ['deployment-failure', 'urgent'] | ||
| }); | ||
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| console.log(`Created issue #${issue.data.number}`); No newline at end of file |
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To address the issue, we will add a permissions block to the workflow file. Since the workflow primarily interacts with GitHub issues (issues: write) and reads repository contents (contents: read), we will explicitly define these permissions at the root level, applying them to all jobs in the workflow unless overridden. This ensures that the GITHUB_TOKEN has the least privilege necessary to perform the intended actions.
Suggested changeset
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.github/workflows/cloudflare-workers-notifications.yml
| @@ -1,3 +1,6 @@ | ||
| permissions: | ||
| contents: read | ||
| issues: write | ||
| name: Deployment Notifications | ||
|
|
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| on: |
Copilot is powered by AI and may make mistakes. Always verify output.
| echo "status=${{ github.event.workflow_run.conclusion }}" >> $GITHUB_OUTPUT | ||
| echo "run_id=${{ github.event.workflow_run.id }}" >> $GITHUB_OUTPUT | ||
| echo "actor=${{ github.event.workflow_run.actor.login }}" >> $GITHUB_OUTPUT | ||
| echo "branch=${{ github.event.workflow_run.head_branch }}" >> $GITHUB_OUTPUT |
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To fix the issue, the untrusted input (${{ github.event.workflow_run.head_branch }}) should be safely passed through an intermediate environment variable, and the shell should use its native syntax to access the variable. This approach avoids direct interpolation and eliminates the risk of code injection. Specifically:
- Replace
${{ github.event.workflow_run.head_branch }}in theechocommand with the environment variable syntax ($BRANCH). - Define the environment variable
BRANCHusing${{ github.event.workflow_run.head_branch }}.
Suggested changeset
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.github/workflows/cloudflare-workers-notifications.yml
| @@ -18,7 +18,9 @@ | ||
| echo "status=${{ github.event.workflow_run.conclusion }}" >> $GITHUB_OUTPUT | ||
| echo "run_id=${{ github.event.workflow_run.id }}" >> $GITHUB_OUTPUT | ||
| echo "actor=${{ github.event.workflow_run.actor.login }}" >> $GITHUB_OUTPUT | ||
| echo "branch=${{ github.event.workflow_run.head_branch }}" >> $GITHUB_OUTPUT | ||
| echo "branch=$BRANCH" >> $GITHUB_OUTPUT | ||
| env: | ||
| BRANCH: ${{ github.event.workflow_run.head_branch }} | ||
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| # Uncomment and configure for Slack notifications | ||
| # - name: Slack Notification |
Copilot is powered by AI and may make mistakes. Always verify output.
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| runs-on: ubuntu-latest | ||
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| steps: | ||
| - name: Checkout repository | ||
| uses: actions/checkout@v4 | ||
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| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 | ||
| with: | ||
| hugo-version: 'latest' | ||
| extended: true | ||
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| - name: Test Hugo build | ||
| run: | | ||
| cd blog | ||
| hugo --panicOnWarning --minify --gc --cleanDestinationDir --destination public --baseURL https://support.tools | ||
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| - name: Check for expired content | ||
| run: | | ||
| cd blog | ||
| hugo list expired | ||
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| Deploy-NonProd: |
Check warning
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Workflow does not contain permissions Medium
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To address this issue, the workflow must explicitly define minimal permissions for the GITHUB_TOKEN using the permissions key. Since the workflow does not appear to use GITHUB_TOKEN for write operations, the least privilege configuration should set contents: read. This change applies to the entire workflow to ensure all jobs inherit the minimal permissions unless overridden.
Suggested changeset
1
.github/workflows/cloudflare-workers.yml
| @@ -1,5 +1,8 @@ | ||
| name: Deploy to Cloudflare Workers | ||
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| permissions: | ||
| contents: read | ||
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| on: | ||
| workflow_dispatch: | ||
| inputs: |
Copilot is powered by AI and may make mistakes. Always verify output.
| uses: actions/checkout@v4 | ||
|
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||
| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 |
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| runs-on: ubuntu-latest | ||
| needs: Test | ||
| if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref != 'refs/heads/main') || (github.event_name == 'workflow_dispatch' && github.event.inputs.environment != 'production') | ||
| strategy: | ||
| matrix: | ||
| environment: | ||
| - ${{ github.event.inputs.environment || 'development' }} | ||
| environment: | ||
| name: ${{ matrix.environment }} | ||
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| steps: | ||
| - name: Checkout repository | ||
| uses: actions/checkout@v4 | ||
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| - name: Setup Node.js | ||
| uses: actions/setup-node@v4 | ||
| with: | ||
| node-version: '18' | ||
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| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 | ||
| with: | ||
| hugo-version: 'latest' | ||
| extended: true | ||
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| - name: Build Hugo site | ||
| run: | | ||
| cd blog | ||
| hugo --minify --gc --cleanDestinationDir --baseURL https://support.tools | ||
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| - name: Install Wrangler | ||
| run: npm install -g wrangler | ||
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| - name: Deploy to Cloudflare Workers | ||
| env: | ||
| CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }} | ||
| run: | | ||
| echo "Deploying to ${{ matrix.environment }} environment" | ||
| wrangler deploy --env ${{ matrix.environment }} | ||
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| - name: Verify deployment | ||
| run: | | ||
| case "${{ matrix.environment }}" in | ||
| "production") | ||
| ENDPOINT="https://support.tools" | ||
| ;; | ||
| "staging") | ||
| ENDPOINT="https://stg.support.tools" | ||
| ;; | ||
| "development") | ||
| ENDPOINT="https://dev.support.tools" | ||
| ;; | ||
| "mst") | ||
| ENDPOINT="https://mst.support.tools" | ||
| ;; | ||
| "qas") | ||
| ENDPOINT="https://qas.support.tools" | ||
| ;; | ||
| "tst") | ||
| ENDPOINT="https://tst.support.tools" | ||
| ;; | ||
| esac | ||
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| echo "Checking deployment at $ENDPOINT" | ||
| # Wait a bit for deployment to propagate | ||
| sleep 30 | ||
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| # Check if site is responding | ||
| HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" "$ENDPOINT" || echo "000") | ||
| if [ "$HTTP_STATUS" = "200" ]; then | ||
| echo "✅ Deployment successful - site is responding" | ||
| else | ||
| echo "❌ Deployment may have issues - HTTP status: $HTTP_STATUS" | ||
| exit 1 | ||
| fi | ||
|
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| # Check health endpoint | ||
| HEALTH_STATUS=$(curl -s -o /dev/null -w "%{http_code}" "$ENDPOINT/healthz" || echo "000") | ||
| if [ "$HEALTH_STATUS" = "200" ] || [ "$HEALTH_STATUS" = "301" ]; then | ||
| echo "✅ Health check passed" | ||
| else | ||
| echo "⚠️ Health check returned status: $HEALTH_STATUS" | ||
| fi | ||
|
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||
| Deploy-Staging: |
Check warning
Code scanning / CodeQL
Workflow does not contain permissions Medium
| node-version: '18' | ||
|
|
||
| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 |
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| runs-on: ubuntu-latest | ||
| needs: Test | ||
| if: github.event_name == 'push' && github.ref == 'refs/heads/main' | ||
| environment: | ||
| name: staging | ||
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| steps: | ||
| - name: Checkout repository | ||
| uses: actions/checkout@v4 | ||
|
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||
| - name: Setup Node.js | ||
| uses: actions/setup-node@v4 | ||
| with: | ||
| node-version: '18' | ||
|
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||
| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 | ||
| with: | ||
| hugo-version: 'latest' | ||
| extended: true | ||
|
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||
| - name: Build Hugo site | ||
| run: | | ||
| cd blog | ||
| hugo --minify --gc --cleanDestinationDir --baseURL https://support.tools | ||
|
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||
| - name: Install Wrangler | ||
| run: npm install -g wrangler | ||
|
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| - name: Deploy to Cloudflare Workers | ||
| env: | ||
| CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }} | ||
| run: | | ||
| echo "Deploying to staging environment" | ||
| wrangler deploy --env staging | ||
|
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| - name: Verify staging deployment | ||
| run: | | ||
| echo "Checking staging deployment at https://stg.support.tools" | ||
| sleep 30 | ||
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| HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" "https://stg.support.tools" || echo "000") | ||
| if [ "$HTTP_STATUS" = "200" ]; then | ||
| echo "✅ Staging deployment successful" | ||
| else | ||
| echo "❌ Staging deployment failed - HTTP status: $HTTP_STATUS" | ||
| exit 1 | ||
| fi | ||
|
|
||
| Deploy-Production: |
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Workflow does not contain permissions Medium
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Copilot Autofix
AI 6 months ago
To fix the problem, add a permissions block explicitly to the root level of the workflow and/or individual jobs. This block should specify the minimal permissions required for each job's functionality. For this workflow:
- At the root level, set
contents: read, as checking out the repository and running commands requires read access. - For jobs that perform deployment or interact with pull requests (e.g.,
Deploy-Staging), specify additional write permissions (e.g.,contents: write).
Suggested changeset
1
.github/workflows/cloudflare-workers.yml
| @@ -1,3 +1,5 @@ | ||
| permissions: | ||
| contents: read | ||
| name: Deploy to Cloudflare Workers | ||
|
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||
| on: | ||
| @@ -135,6 +137,8 @@ | ||
|
|
||
| Deploy-Staging: | ||
| runs-on: ubuntu-latest | ||
| permissions: | ||
| contents: write | ||
| needs: Test | ||
| if: github.event_name == 'push' && github.ref == 'refs/heads/main' | ||
| environment: | ||
| @@ -185,6 +189,8 @@ | ||
|
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| Deploy-Production: | ||
| runs-on: ubuntu-latest | ||
| permissions: | ||
| contents: write | ||
| needs: Deploy-Staging | ||
| if: github.event_name == 'push' && github.ref == 'refs/heads/main' | ||
| environment: |
Copilot is powered by AI and may make mistakes. Always verify output.
| node-version: '18' | ||
|
|
||
| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 |
Check warning
Code scanning / CodeQL
Unpinned tag for a non-immutable Action in workflow Medium
Comment on lines
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| runs-on: ubuntu-latest | ||
| needs: Deploy-Staging | ||
| if: github.event_name == 'push' && github.ref == 'refs/heads/main' | ||
| environment: | ||
| name: production | ||
| url: https://support.tools | ||
|
|
||
| steps: | ||
| - name: Checkout repository | ||
| uses: actions/checkout@v4 | ||
|
|
||
| - name: Setup Node.js | ||
| uses: actions/setup-node@v4 | ||
| with: | ||
| node-version: '18' | ||
|
|
||
| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 | ||
| with: | ||
| hugo-version: 'latest' | ||
| extended: true | ||
|
|
||
| - name: Build Hugo site | ||
| run: | | ||
| cd blog | ||
| hugo --minify --gc --cleanDestinationDir --baseURL https://support.tools | ||
|
|
||
| - name: Install Wrangler | ||
| run: npm install -g wrangler | ||
|
|
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| - name: Deploy to Cloudflare Workers | ||
| env: | ||
| CLOUDFLARE_API_TOKEN: ${{ secrets.CLOUDFLARE_API_TOKEN }} | ||
| run: | | ||
| echo "Deploying to production environment" | ||
| wrangler deploy --env production | ||
|
|
||
| - name: Verify production deployment | ||
| run: | | ||
| echo "Checking production deployment at https://support.tools" | ||
| sleep 30 | ||
|
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| HTTP_STATUS=$(curl -s -o /dev/null -w "%{http_code}" "https://support.tools" || echo "000") | ||
| if [ "$HTTP_STATUS" = "200" ]; then | ||
| echo "✅ Production deployment successful" | ||
| else | ||
| echo "❌ Production deployment failed - HTTP status: $HTTP_STATUS" | ||
| exit 1 | ||
| fi | ||
|
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| - name: Create deployment notification | ||
| run: | | ||
| echo "🚀 Successfully deployed to production!" | ||
| echo "URL: https://support.tools" | ||
| echo "Version: ${{ github.sha }}" | ||
| echo "Deployed at: $(date -u +'%Y-%m-%d %H:%M:%S UTC')" No newline at end of file |
Check warning
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Workflow does not contain permissions Medium
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Copilot Autofix
AI 6 months ago
To fix the issue, an explicit permissions block needs to be added to the Deploy-Production job in the workflow file. This block should restrict permissions to the minimum required for the job. Since the job involves deploying to production, it likely only needs contents: read for repository access.
The fix involves:
- Adding a
permissionsblock to theDeploy-Productionjob. - Setting
contents: readto limit repository access to read-only.
Suggested changeset
1
.github/workflows/cloudflare-workers.yml
| @@ -187,6 +187,8 @@ | ||
| runs-on: ubuntu-latest | ||
| needs: Deploy-Staging | ||
| if: github.event_name == 'push' && github.ref == 'refs/heads/main' | ||
| permissions: | ||
| contents: read | ||
| environment: | ||
| name: production | ||
| url: https://support.tools |
Copilot is powered by AI and may make mistakes. Always verify output.
| node-version: '18' | ||
|
|
||
| - name: Setup Hugo | ||
| uses: peaceiris/actions-hugo@v2 |
Check warning
Code scanning / CodeQL
Unpinned tag for a non-immutable Action in workflow Medium
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Summary
This PR includes two major updates:
1. 🚀 Cloudflare Workers Migration
Migrates the support.tools website from Kubernetes to Cloudflare Workers for improved performance and reduced operational overhead.
Key Changes:
wrangler.tomlBenefits:
Live Environments:
2. 📚 25 Advanced Linux & Systems Programming Blog Posts
Adds comprehensive technical content covering:
Testing
Migration Notes
🤖 Generated with Claude Code