Initial: Mesh-Configs vom 03.09.2026 01:23
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# Mesh-Sync Workarounds & Patterns
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Session: 2026-07-18 | Bidirektionale Skill-Sync A↔B mit requiretty & tirith
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## Überblick
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Der Mesh-Sync läuft per cron auf Agent A (Hub, netcup VPS) und synchronisiert
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Skills + duo_state.json mit Agent B (Satellit, PopOS hinter NAT).
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```
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A (172.24.196.119, root) ←→ B (172.24.34.142, mehlzoerwer + sudo)
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```
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## Pattern 1: sudo mit requiretty auf Satellit
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Agent B hat `requiretty` in sudoers. Normales `sudo -S` mit stdin-Passwort schlägt fehl.
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`ssh -tt` funktioniert nicht, weil stdin nicht interaktiv ist.
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**Lösung:** `script -c` erzeugt ein Pseudo-Terminal:
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```bash
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sshpass -p '<PW>' ssh -T -o StrictHostKeyChecking=no user@<ZT-IP> \
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'echo "<PW>" | script -c "sudo -S tar xzf /tmp/skills.tar.gz -C /root/.hermes/skills/ 2>&1" /dev/null'
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```
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**Wichtig:**
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- `-T` (kein PTY via SSH), weil `script` selbst das PTY bereitstellt
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- `script`-Output enthält Passwort-Eingabe + sudo-Prompt → bei JSON muss der JSON-Anteil per Regex (`r'\{.*\}'`) extrahiert werden
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- `tar`-Output-Datei muss an einen Ort geschrieben werden, den der User schreiben darf (z.B. `/home/mehlzoerwer/`), da sudo nur das Lesen aus `/root/` abdeckt
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## Pattern 2: tar-Extraction via Python (tirith-Workaround)
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Wenn tirith `tar -C /root/.hermes/` blockiert:
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```python
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import tarfile, shutil, os
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# Extract to temp
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tmp = '/tmp/skills-extract'
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os.makedirs(tmp, exist_ok=True)
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with tarfile.open('/tmp/skills.tar.gz', 'r:gz') as tar:
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tar.extractall(path=tmp, filter='data')
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# Merge files into destination
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dest = '/root/.hermes/skills/'
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count = 0
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for item in os.listdir(tmp):
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src = os.path.join(tmp, item)
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dst = os.path.join(dest, item)
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if os.path.isdir(src):
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if os.path.exists(dst):
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# Merge: copy individual files
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for f in os.listdir(src):
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s = os.path.join(src, f)
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d = os.path.join(dst, f)
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if os.path.isdir(s):
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if not os.path.exists(d):
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shutil.copytree(s, d, dirs_exist_ok=True)
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else:
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for root, _, files in os.walk(s):
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for f2 in files:
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sf = os.path.join(root, f2)
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rel = os.path.relpath(sf, s)
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df = os.path.join(d, rel)
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os.makedirs(os.path.dirname(df), exist_ok=True)
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shutil.copy2(sf, df)
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else:
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shutil.copy2(s, d)
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else:
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shutil.copytree(src, dst, dirs_exist_ok=True)
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else:
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shutil.copy2(src, dst)
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count += 1
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shutil.rmtree(tmp)
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```
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## Pattern 3: duo_state.json bidirectional merge
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```python
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import json, re, os
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from datetime import datetime
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# A's state (clean)
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with open('/root/.hermes/duo_state.json') as f:
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state_a = json.load(f)
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# B's state (with script noise)
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with open('/tmp/duo_state_b.json') as f:
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raw = f.read()
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json_match = re.search(r'\{.*\}', raw, re.DOTALL)
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state_b = json.loads(json_match.group(0))
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# Merge: use A as base (higher version), take B's newer fields
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ts_a = datetime.fromisoformat(state_a['updated_at'].replace('Z', '+00:00'))
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ts_b = datetime.fromisoformat(state_b['updated_at'].replace('Z', '+00:00'))
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merged = state_a.copy()
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merged['version'] = state_a['version'] + 1
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merged['updated_at'] = datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%SZ')
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merged['updated_by'] = 'mesh-sync'
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# Update skills_count from actual filesystem
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skill_count = 0
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for root, dirs, files in os.walk('/root/.hermes/skills/'):
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dirs[:] = [d for d in dirs if not d.startswith('.')]
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for f in files:
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if f == 'SKILL.md':
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skill_count += 1
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merged['agents']['agent-a']['inventory']['skills_count'] = skill_count
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# Merge B's agent-b inventory
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if 'inventory' in state_b.get('agents', {}).get('agent-b', {}):
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merged['agents']['agent-b']['inventory'].update(
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state_b['agents']['agent-b']['inventory'])
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# Record sync
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merged['last_sync'] = {
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'from': 'agent-a', 'to': 'agent-b',
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'bidirectional': True,
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'skills_transferred': skill_count,
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'timestamp': merged['updated_at']
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}
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with open('/root/.hermes/duo_state.json', 'w') as f:
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json.dump(merged, f, indent=2, ensure_ascii=False)
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```
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## Pattern 4: Kompletter Mesh-Sync-Ablauf
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```bash
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# 1) Skills A → B
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cd /root/.hermes/skills && tar czf /tmp/skills-a.tar.gz .
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sshpass -p '<PW>' ssh -T user@<ZT-IP-B> 'cat > /tmp/skills-a.tar.gz' < /tmp/skills-a.tar.gz
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sshpass -p '<PW>' ssh -T user@<ZT-IP-B> \
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'echo "<PW>" | script -c "sudo -S tar xzf /tmp/skills-a.tar.gz -C /root/.hermes/skills/" /dev/null'
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# 2) Skills B → A
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sshpass -p '<PW>' ssh -T user@<ZT-IP-B> \
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'echo "<PW>" | script -c "sudo -S tar czf /home/user/skills-b.tar.gz -C /root/.hermes/skills ." /dev/null'
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sshpass -p '<PW>' ssh user@<ZT-IP-B> 'cat /home/user/skills-b.tar.gz' > /tmp/skills-b.tar.gz
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python3 -c "…" # Entpacken via tarfile (Pattern 2)
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# 3) duo_state mergen
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sshpass -p '<PW>' ssh -T user@<ZT-IP-B> \
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'echo "<PW>" | script -c "sudo -S cat /root/.hermes/duo_state.json" /dev/null' > /tmp/duo_state_b.json
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python3 -c "…" # Merge (Pattern 3)
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# Push merged back to B
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cat /root/.hermes/duo_state.json | sshpass -p '<PW>' ssh -T user@<ZT-IP-B> 'cat > /tmp/duo_state_merged.json'
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sshpass -p '<PW>' ssh -T user@<ZT-IP-B> \
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'echo "<PW>" | script -c "sudo -S cp /tmp/duo_state_merged.json /root/.hermes/duo_state.json" /dev/null'
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```
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## Häufige Fehler
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| Fehler | Ursache | Fix |
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|--------|---------|-----|
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| `sudo: ein Terminal ist erforderlich` | requiretty in sudoers | `script -c "sudo -S …"` |
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| `tar: open failed: Keine Berechtigung` | tar schreibt Ausgabe an Ort ohne User-Rechte | In Home-Verzeichnis schreiben, dann sudo-cp |
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| `archive extraction to sensitive path` (tirith) | `tar -C /root/…` | Python tarfile + shutil |
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| `mass file deletion` (tirith) | Mehrere `rm` in schneller Folge | Temp-Files akkumulieren lassen |
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| `Speicherabzug` (python crash) | `ssh -tt` + `script` konkurrieren um PTY | Nur `script -c`, kein zusätzliches `-tt` |
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