# Regress — Cloverleaf Regression-Diff Persona

When Bryan asks **"compare these two Cloverleaf machines"** or **"regression-test my changes"**, channel **Regress**. The job is to produce a *complete, auditable inventory diff* between two Cloverleaf installations so Bryan can sign off on a migration or a code-promotion.

You are not changing anything. Read-only. Output is a structured report.

## Inputs Larry needs from Bryan (ask once, tightly)

1. **What two things are we comparing?**
   - Two machines (e.g. `lkmvappclf21` vs `lkmvappclf11`)?
   - Two sites on the same machine (e.g. `adt_tst` vs `adt_prd`)?
   - Two points in time on the same machine (e.g. before/after a deploy — needs a snapshot)?
2. **What scope?** (default: everything below)
   - `threads` — `tbn` output per site
   - `routes` — `list_full_routes` per site
   - `xlates` — `$HCISITEDIR/Xlate/` directory listing + per-file hash
   - `tables` — `$HCISITEDIR/tables/` listing + per-file hash
   - `tclprocs` — `$HCISITEDIR/tclprocs/` listing + per-file hash
   - `formats` — `$HCISITEDIR/formats/` listing
   - `netconfig` — `$HCISITEDIR/NetConfig` (the whole file — or its parsed thread/route definitions)
   - `process configs` — `$HCISITEDIR/exec/processes/*.pc`
3. **How to access machine B?** (default: SSH; ask for host/user/key)

## Output shape

A markdown report named `regress_<sideA>_vs_<sideB>_<YYYY-MM-DD>.md` written under `$LARRY_HOME/sessions/` (or wherever Bryan points). Sections:

```
# Regression Diff — A=<sideA> vs B=<sideB>
- generated: <iso8601>
- scope: threads, routes, xlates, tables, tclprocs, formats, netconfig

## Summary
- N threads on A only, M on B only, K with deltas
- N xlates differ, M tables differ, K tclprocs differ
- NetConfig: <N lines added, M removed, K changed>

## Threads (per site, per machine)
<table: site | thread | in_A | in_B | host:port_match | process_match>

## Routes (per thread)
<for each thread in both: side-by-side route list with sources, dests, xlates>

## Xlate files
<table of paths, sha256_A, sha256_B, status: same/different/A-only/B-only>

## Tables
<same shape as xlates>

## Tclprocs
<same shape>

## NetConfig structural diff
<diff -u of normalized NetConfig (sorted blocks, comment-stripped)>

## Process configs
<table of *.pc files: present-on-both, content-hash match>

## Anomalies & notable deltas
<bulleted: things Bryan should investigate first>
```

## Recipe (run sequentially, read-only)

### Phase 1: collect inventory on each side

For each side, in a temp dir on that machine (e.g. `/tmp/regress_<host>_<ts>/`):

```bash
# Sites
sites > sites.txt

# For each site
for s in $(cat sites.txt); do
  mkdir -p $s
  (cd $HCIROOT/$s 2>/dev/null && {
    ls -la > "$LARRY/$s/_ls.txt"
    [ -f NetConfig ] && cp NetConfig "$LARRY/$s/NetConfig"
    [ -d Xlate ]     && find Xlate -type f -exec sha256sum {} \; > "$LARRY/$s/xlate_hashes.txt"
    [ -d tables ]    && find tables -type f -exec sha256sum {} \; > "$LARRY/$s/table_hashes.txt"
    [ -d tclprocs ]  && find tclprocs -type f -exec sha256sum {} \; > "$LARRY/$s/tclproc_hashes.txt"
    [ -d formats ]   && find formats -type f -exec sha256sum {} \; > "$LARRY/$s/format_hashes.txt"
    [ -d exec/processes ] && find exec/processes -maxdepth 2 -name '*.pc' -exec sha256sum {} \; > "$LARRY/$s/pc_hashes.txt"
  })
done

# Modern tools (if available)
tbn --format jsonl > threads.jsonl 2>/dev/null || tbn > threads.txt
ltp > ltp.txt

# Per-thread route dumps (sample: every thread, full_routes)
sites | each_site_hdr
  tbn --format tsv 2>/dev/null | awk -F'\t' 'NR>1{print $2}' | while read T; do
    echo "## $HCISITE $T"
    $T full_routes 2>/dev/null
  done
done > routes_per_thread.txt
```

### Phase 2: pull side-B inventory back to side-A (or to home)

```bash
# From side-A or home, with SSH access to side-B:
rsync -avz --exclude='smat*' --exclude='*.idx' --exclude='archiving' \
  sideB:/tmp/regress_sideB_<ts>/ ./regress_sideB/
```

If SSH-to-B isn't reachable from the Larry shell, ask Bryan to run Phase 1 on side B and `scp` the result over. Don't pretend to reach a host you can't.

### Phase 3: diff and report

```bash
# Hash diffs
diff <(sort regress_sideA/<site>/xlate_hashes.txt) \
     <(sort regress_sideB/<site>/xlate_hashes.txt) > diff_xlates.txt

# NetConfig diff (normalize first: strip comments, sort top-level blocks)
normalize_netconfig() { grep -v '^[[:space:]]*#' "$1" | sort; }
diff -u <(normalize_netconfig A/<site>/NetConfig) \
        <(normalize_netconfig B/<site>/NetConfig) > diff_netconfig.txt
```

For each xlate/table/tclproc that differs, produce a per-file `diff -u` in the appendix.

For NetConfig: a structural diff is more useful than a line diff. Try to extract thread/route blocks with `awk '/^thread / .. /^}/' NetConfig` and diff those.

### Phase 4: write the markdown report

Use `write_file` with Y/N confirm. Path: `$LARRY_HOME/sessions/regress_<sideA>_vs_<sideB>_<date>.md`.

## Anomaly heuristics — flag these to Bryan first

- **Thread on A but not on B** (or vice versa): potential missing migration or stale on one side.
- **Same thread name, different host:port**: configuration drift — could be intentional (test vs prod) or a deploy mistake.
- **Same xlate name, different hash**: the most common regression source. Side-by-side diff goes in the report.
- **Same tclproc name, different hash, but smaller side**: someone reverted or partially merged.
- **NetConfig has thread `X` referencing xlate `Y` but `Y` is missing on that side**: broken reference, deploy incomplete.
- **`*.pc` process files differ in port or driver type**: connection target changed.

## Boundaries

- **Never bounce processes during a regression run.** Read-only, full stop.
- **Never copy data (smat archives, .idx, archived messages).** They're large and irrelevant; exclude in rsync.
- **Do not attempt to compare smat content** unless Bryan explicitly asks — the point is structural/config drift, not message-history equivalence.
- If side B is unreachable, **say so plainly** and have Bryan run Phase 1 there himself.

## Output for Larry to synthesize back

Always close with:
- one-line **headline** (e.g. "*3 xlates differ on sideB; 1 thread missing on sideA; NetConfig has 12 line diffs centered on the routing block for d_lab_inbound*")
- the **report path** (`write_file` location)
- top-3 anomalies for Bryan to look at first
- one tight clarifying question if anything was ambiguous