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fix(update): consolidate pre-update backups into one gated mechanism (#65754)

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hermes update ran TWO separate pre-update backup mechanisms: the
config-gated full zip (updates.pre_update_backup, default off) and an
unconditional quick state snapshot added for #15733 that ignored the
user's setting entirely. On a large state.db (observed: 24 GB) the
'cheap' snapshot silently added ~60s to every update and ate 24 GB of
disk in state-snapshots/.

Now there is ONE mechanism, gated by updates.pre_update_backup with
three modes:

- quick (new default): state snapshot of critical small files (pairing
  JSONs, cron jobs, config, auth, per-profile DBs). Files over 1 GiB
  are skipped with a warning so a bloated state.db can never stall the
  update again.
- full: the quick snapshot plus the HERMES_HOME zip (old 'true'
  behavior; --backup forces it for one run).
- off: nothing runs — an explicit opt-out now disables the quick
  snapshot too (--no-backup does the same per-run).

Legacy booleans are honored: true -> full, false -> off.

_run_pre_update_backup() now returns the quick-snapshot id so the
post-update cron-jobs restore safety net (#34600) keeps working; the
snapshot moved from the post-fetch site to the pre-mutation site,
which also covers the zip-fallback update path it previously missed.
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Teknium 2026-07-16 08:47:25 -07:00 • committed by GitHub
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4
website/docs/reference/cli-commands.md
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@ -1562,8 +1562,8 @@ Pulls the latest `hermes-agent` code and reinstalls dependencies in the managed
|--------|-------------|
| `--gateway` | Internal mode used by the messaging `/update` command. Uses file-based IPC for prompts and progress streaming instead of reading from terminal stdin. Not a gateway restart flag. |
| `--check` | Check whether an update is available without pulling, installing dependencies, or restarting anything. |
| `--no-backup` | Skip the pre-update backup for this run, even if `updates.pre_update_backup` is enabled in `config.yaml`. |
| `--backup` | Create a labeled pre-update snapshot of `HERMES_HOME` (config, auth, sessions, skills, pairing data) before pulling. Default is **off** — the previous always-backup behavior was adding minutes to every update on large homes. Flip it on permanently via `updates.pre_update_backup: true` in `config.yaml`. |
| `--no-backup` | Skip all pre-update backups for this run (both the quick state snapshot and the full zip), regardless of `updates.pre_update_backup`. |
| `--backup` | Force a **full** pre-update backup for this run: the quick state snapshot plus a complete zip of `HERMES_HOME` (config, auth, sessions, skills, pairing data). The default mode is `quick` — a lightweight state snapshot only. Set the permanent mode via `updates.pre_update_backup: quick | full | off` in `config.yaml`. |
| `--yes`, `-y` | Assume yes for interactive prompts such as config migration and stash restore. API-key entry is skipped; run `hermes config migrate` separately for those. |
Additional behavior: