Repo Sync

---
name: repo-sync
description: "Smart repository synchronization across workspace-hub ecosystem — diagnoses and fixes pull failures (detached HEAD, diverged branches, uncommitted changes)"
type: reference
version: 1.1.0
category: workspace-hub
last_updated: 2026-02-14
source: internal
invoke: /repo-sync
capabilities: []
requires: []
see_also: []
tags: [git, sync, multi-repo, automation]
related_skills: [repo-structure, ecosystem-terminology]
freedom: low
---

# Repo Sync

Smart pull-all with automatic diagnosis and repair for the workspace-hub multi-repo ecosystem.

## Usage

`/repo-sync` — Pull all repos, diagnose failures, and fix them.

Optional arguments:
- `/repo-sync pull` — Pull all repos (default)
- `/repo-sync status` — Status check only, no pulls
- `/repo-sync push` — Push all repos with unpushed commits

## What It Does

### Phase 1: Bulk Pull
Run `./scripts/repository_sync pull all` to attempt pulling every repo.

### Phase 2: Diagnose Failures
For each repo that failed, check:
1. **Detached HEAD** — submodules pinned at a commit, not on a branch
2. **Diverged branches** — local and remote have diverged, needs merge
3. **Uncommitted changes** — dirty working tree blocking pull
4. **No upstream** — no tracking branch configured

### Phase 3: Auto-Fix
Apply the appropriate fix per failure type:

| Failure | Fix |
|---------|-----|
| Detached HEAD (submodule) | `git checkout main && git pull --no-rebase` |
| Diverged branches | `git pull --no-rebase` (merge strategy) |
| Uncommitted changes | `git stash && git pull --no-rebase && git stash pop` |
| No upstream | Report only, no auto-fix |
| Large repo partial checkout / timed-out pull | Use no-untracked status probes, kill hung sync/status processes if needed, preserve recovery artifacts under `.git/recovery-backups/`, restore accidental tracked deletions; see `references/large-repo-partial-checkout-recovery.md` |
| Archived/read-only remote | Do not force workaround; preserve/export local-only commits and open a follow-up issue |

### Archived / Read-only Remote Exception Handling

If a repo is ahead locally but push fails because the remote is archived or read-only:

1. Confirm the state explicitly:
   - current branch
   - local HEAD vs upstream HEAD
   - ahead commit list (`git log @{u}..HEAD`)
   - diffstat for the ahead range
2. Do NOT try to bypass the archive/read-only state.
3. If the ahead range is non-trivial, export a preservation artifact:
   - `git format-patch -1 <commit> --stdout > <workspace-hub-artifact>.patch`
4. Write a short decision memo with explicit options:
   - abandon
   - archive-only
   - selective port to a writable successor
5. Open a GitHub issue documenting the exception and link the exported patch artifact.
6. Default recommendation when there is no clear writable successor and the diff is large/destructive: `archive-only`.

This came up with `pyproject-starter`, where the remote was archived/read-only and the only ahead commit was a massive destructive sync commit. The safe action was to preserve the patch in repo artifacts and require explicit human review before any migration.

### Phase 4: Encoding Health Check
After pulling, run the encoding check against all work queue and skill files
to surface any Windows-created UTF-16 / CRLF files that came in via the pull:

```bash
.claude/hooks/check-encoding.sh
```

This runs in warn-only mode (post-merge behaviour) — it reports bad files but
does not block. Any files flagged should be converted and committed immediately:

```bash
# Convert a UTF-16 file to UTF-8
iconv -f UTF-16 -t UTF-8 <file> | sed 's/\r//' > /tmp/fixed.md
mv /tmp/fixed.md <file>
git add <file> && git commit -m "fix(encoding): convert <file> to UTF-8"
```

### Phase 5: Ecosystem Health + Summary
After the encoding check, spawn an ecosystem health agent in the background:

```python
Task(
    subagent_type="Bash",
    description="Ecosystem health check",
    prompt="Run the 14-check suite from /ecosystem-health skill. Report pass/fail/warn for each group.",
    run_in_background=True
)
```

This does not block the pull summary. Report health results alongside repo status.

See `/ecosystem-health` skill for the full check suite and pass conditions.

## Implementation

When this skill is invoked, execute these steps:

### Step 1: Run bulk pull
```bash
./scripts/repository_sync pull all
```
Capture output. Identify repos marked with `✗ Failed`.

### Step 2: For each failed repo, diagnose
```bash
cd <repo_path>
# Check if on a branch
git branch --show-current  # empty = detached HEAD

# Check for uncommitted changes
git status --porcelain

# Check divergence (only if on a branch with upstream)
git rev-list --count @{u}.. 2>/dev/null  # ahead
git rev-list --count ..@{u} 2>/dev/null  # behind
```

### Step 3: Apply fixes
Run all independent repo fixes in parallel using the Bash tool.

**Detached HEAD:**
```bash
cd <repo_path> && git checkout main && git pull --no-rebase
```

**Diverged branches:**
```bash
cd <repo_path> && git pull --no-rebase
```

**Uncommitted changes blocking pull:**
```bash
cd <repo_path> && git stash && git pull --no-rebase && git stash pop
```

If `stash pop` has conflicts, report to user — do NOT auto-resolve.

### Step 4: Report summary table
Format as markdown table:

```
| Repo | Issue | Fix Applied | Result |
|------|-------|-------------|--------|
```

## Important Notes

- **Never force-push** or `reset --hard` without explicit user approval
- **Never rebase** diverged branches — always merge (per workspace AGENTS.md)
- **digitalmodel** and **worldenergydata** are submodules — detached HEAD is normal when workspace-hub pins a specific commit
- After fixing submodules, the workspace-hub `git status` will show them as modified (new submodule pointer) — this is expected
- If `stash pop` fails with conflicts, stop and report to user
- Use `--no-rebase` on all pulls to avoid rebase surprises on diverged repos
- **Encoding check runs after every pull** — UTF-16 files from Windows editors
  crash `generate-index.py` and other parsers silently. Fix immediately on detection.
- If the user explicitly wants all dirty/untracked files tracked, run a second pass that stages with `git add -A`, commits on the repo's current branch, and pushes that branch before attempting broader branch-merging work.
- For branch-merging across many repos, merge into each repo's actual default branch (`main` or `master`) detected from GitHub / `origin/HEAD`; do not assume `main`.
- For large batch merges, use a temporary worktree checked out from the default branch (prefer `origin/<default>` if available) so merges are isolated from the user's current working tree and local dirty state.
- Workspace-hub can mutate state during commit/push hooks (`.claude/state/*`, logs, generated reports). After a commit or failed push, always re-run `git status` and re-fetch before retrying; apparent ref-lock push failures may be stale-expectation races rather than true divergence.
- New-branch pushes in workspace-hub may trigger expensive pre-push checks across tier-1 repos and can time out. If the user has approved sensible commands and the goal is repo hygiene/sync rather than validation, `git push --no-verify` may be necessary after verifying local/remote state.
- Archived/read-only repos can still be committed locally for preservation, but push/merge to remote will fail; report them explicitly as blocked rather than retrying.
- In huge repos, do not run broad `git status --porcelain -uall`, full `du`, or full checkout/pull loops as the first recovery move. Start with no-untracked status and ahead/behind probes, then follow `references/large-repo-partial-checkout-recovery.md`.
- If interrupted sync creates `.claude.partial-pull-backup-*`, `.codex.partial-pull-backup-*`, or generated provider cache trees, preserve them inside `.git/recovery-backups/` instead of committing or deleting them; they are recovery artifacts unless the user explicitly says otherwise.

## Iron Law

> No destructive git operation (force-push, reset --hard, auto-resolve conflicts) shall be performed without explicit user confirmation — ever.

## Rationalization Defense

| Excuse | Reality |
|--------|---------|
| "The conflict is trivial — I can auto-resolve it" | Trivial-looking conflicts have destroyed production data. Stash pop conflicts go to the user, always. |
| "Force-push is safe here because nobody else uses this branch" | You do not have full visibility into all machines and sessions using this repo. Assume others are active. |
| "I need to reset --hard to get to a clean state" | Use `git stash` to preserve work, then pull. Hard reset is data destruction, not cleanup. |
| "The encoding check is slow, I'll skip it this time" | UTF-16 files crash parsers silently. Skipping the check means shipping a time bomb. |

## Red Flags

These phrases signal you are about to violate the Iron Law:
- "let me just force-push to fix this"
- "I'll reset to a clean state"
- "this merge conflict is simple enough to auto-resolve"
- "skipping the encoding check to save time"
- "nobody else is working on this repo"