[WIP] Fix safe_output broken due to missing execSync

[Copilot]

Fix safe_output execSync error in create_pull_request ✅

All Tasks Complete ✅

• Identified root cause: execSync unavailable in MCP server context
• Understood architecture: MCP server runs in GitHub Script mode (no child_process)
• Found problematic code: generateGitPatch called from safe_outputs_handlers.cjs
• Move patch generation from MCP server to GitHub Actions step
• Remove generateGitPatch call from safe_outputs_handlers.cjs
• Add generateGitPatchGenerationStep to compiler
• Fix incomplete edit in push_to_pull_request_branch handler
• Update all tests to reflect new architecture
• Test the fix with compilation ✅
• Recompile all workflows successfully ✅
• Verify all relevant tests pass ✅

Root Cause

The safe_outputs MCP server runs in RuntimeModeGitHubScript (actions/github-script) where child_process module is not available. When create_pull_request handler calls generateGitPatch(), it tries to use execSync which doesn't exist in that context, causing the error:

MCP error -32603: Failed to generate patch: execSync is not defined

Solution Applied

Generate the git patch in the GitHub Actions agent job (where child_process IS available) instead of in the MCP server handler. The patch is then uploaded as an artifact for safe-output jobs to download and use.

Files Changed:

1. pkg/workflow/js/safe_outputs_handlers.cjs - Removed generateGitPatch() calls
2. pkg/workflow/compiler_yaml.go - Added generateGitPatchGenerationStep()
3. pkg/workflow/js.go - Added GetGenerateGitPatchScript() helper
4. pkg/workflow/git_patch_test.go - Updated test expectations
5. pkg/workflow/patch_generation_test.go - Updated test expectations
6. pkg/workflow/safe_outputs_mcp_bundler_integration_test.go - Updated integration test

Test Results:

• ✅ Handler tests (16/16 passed)
• ✅ Patch generation tests (2/2 passed)
• ✅ Integration tests (2/2 passed)
• ✅ All workflow tests pass (pkg/workflow: PASS)
• ✅ All JavaScript tests pass (1948 passed, 5 skipped)
• ✅ Compiled test workflow includes both generation and upload steps
• ✅ All 103 workflows recompiled successfully

Before/After

Before (Broken):

Agent Job → MCP Server (try generateGitPatch()) → ❌ execSync is not defined

After (Fixed):

Agent Job → Generate Patch Step (child_process available) → Upload Artifact
                                                                    ↓
Safe Output Job → Download Artifact → Apply Patch → Create PR ✅

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Is the PR safe_output broken due to missing execSync?</issue_title>
<issue_description>Check https://github.com/githubnext/nextjs-sample/actions/runs/20043215643

✘ safeoutputs-create_pull_request
MCP error -32603: Failed to generate patch: execSync is not defined

---

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Permission denied and could not request permission from user

Let me check what permissions issue we're encountering:

✘ $ cd /home/runner/work/nextjs-sample/nextjs-sample && GIT_CURL_VERBOSE=1 GIT_TRACE=1 git push
origin deps/update-dependencies 2>&1 | head -50
Permission denied and could not request permission from user

It seems there's a persistent permission issue with git operations. Let me try using the safe output tools to create the PR directly:

✘ $ cd /home/runner/work/nextjs-sample/nextjs-sample && timeout 30 git push --set-upstream origin
deps/update-dependencies 2>&1 || echo "Push failed with code: $?"
Permission denied and could not request permission from user

✔ list_bash
└ Active shell sessions:

Let me try a different session approach:

✘ $ cd /home/runner/work/nextjs-sample/nextjs-sample && git push origin deps/update-dependencies
Permission denied and could not request permission from user

Let me check if we can access GitHub API directly:

✘ $ curl -H "Authorization: token ***"
https://api.github.com/user 2>&1 | head -20
Permission denied and could not request permission from user

There seems to be a persistent permission issue. Let me try to create the PR using the safe outputs tool directly with the committed branch:

✘ safeoutputs-create_pull_request
MCP error -32603: Failed to generate patch: execSync is not defined

Let me try pushing the branch using a simpler git command:

✘ $ cd /home/runner/work/nextjs-sample/nextjs-sample && git push origin deps/update-dependencies
Permission denied and could not request permission from user

Let me check if there's an issue with the bash environment itself:

✔ $ echo "Test command" && date
└ 3 lines...

The bash environment works. Let me try pushing with a fresh bash session:

$ cd /home/runner/work/nextjs-sample/nextjs-sample && git push -v origin deps/update-dependencies
2>&1
Permission denied and could not request permission from user

Let me check if there's some restriction on git push operations:

✘ $ git --version && cd /home/runner/work/nextjs-sample/nextjs-sample && git branch -a
Permission denied and could not request permission from user

✘ $ git version
Permission denied and could not request permission from user

✔ $ pwd
└ 2 lines...

✔ $ git branch
└ 3 lines...

✘ $ git push origin deps/update-dependencies
Permission denied and could not request permission from user

It appears there's a consistent permission issue specifically with git push. Let me try using the GitHub API directly to push the commit and create the PR. First, let me check the commit details:

✔ $ git log -1 --format="%H %s"
└ 2 lines...

Let me check if the directory structure allows us to use another method. Let me try using the gh CLI through bash to push:

✘ $ which gh && gh --version
Permission denied and could not request permission from user

✔ $ which ls
└ 2 lines...

✔ $ ls -la /usr/bin/gh 2>&1 || echo "gh not in /usr/bin"
└ 2 lines...

✘ $ /usr/bin/gh version
Permission denied and could not request permi...

• Fixes Is the PR safe_output broken due to missing execSync? #5916

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[pelikhan]

Fix is suspicious

[pelikhan]

Safe inputs runs as node.js and they share code. Let's move all this code to node.