Polish pass for the migration system. Two concrete additions; the live-mirror
and full drift-verify ideas from the original plan are intentionally
deferred — both need real-world test data to land correctly, and the kernel
already exposes everything they'd need.
Per-app migrate hooks (scripts/migrate/migrate_hooks.sh):
Apps can declare two optional functions in their tools.sh (already
auto-sourced per [[libreportal-modular-app-tools]]):
<app>_migrate_pre() — runs before stop+wipe
<app>_migrate_post() — runs after restart, before the user sees it
Each receives:
$1 = source identifier (peer name or backup-tag hostname)
$2 = transport ("restic" | "direct-ssh")
migrateRunHook() is now called from both migration apply paths:
- migrate_apply.sh (restic-mediated, shared backup channel)
- peer_pull.sh (direct-SSH, peer-shell stream)
Use cases: rotate federation keys after a Mastodon move, regenerate
OIDC client secrets, drop SaaS-style locks, fix hostname-baked configs
the URL-rewrite layer doesn't cover.
Hooks are optional — apps without them inherit the standard flow.
Failed hooks emit a non-fatal notice (the rest of the migrate still
reaches 'done') so a single bad hook can't strand an otherwise-working
app in stopped state.
Peer friendly-name overlay (Migrate tab):
Was deferred from Phase 2 because it required Phase 3's UI to feel
cohesive. BackupPage.refreshAll() now also fetches peers.json and builds
a hostname → peer-name lookup. renderMigrate() shows
'homelab (host: homelab.lan)'
for any backup-channel peer that matches the source host, and falls back
to the bare hostname when no peer is defined. Same data, friendlier UI.
Skipped (genuinely deferred, not just out of time):
- Live mirror / warm-standby (continuous one-way sync). Needs a scheduler
+ drift-state to track. Right place for it is a separate feature on top
of the existing kernel rather than bolted onto migrate.
- Drift-verify ("what would change if I migrated?"). Cheap to write but
needs a real cross-host pair to validate against — adding it untested
would just be theatre.
Signed-off-by: librelad <librelad@digitalangels.vip>
Phase 0 of the migration-system refresh. Replaces the 77-line
scripts/migrate/ with a properly-shaped kernel that Phase 1 (WebUI) and
Phase 3 (direct peer SSH) can both build on.
New module layout (6 files):
migrate_progress.sh — migrateEmit JSON-per-line helper; opt-in via
MIGRATE_JSON_PROGRESS=1, writes to fd 3 if open
(clean WebUI streaming channel) else stdout.
migrate_discover.sh — migrateDiscoverHosts / migrateDiscoverApps /
migrateDiscoverAppDetail (JSON {snapshots, latest_*}).
Old migrateDiscoverAppsForHost kept as back-compat.
migrate_preflight.sh — migratePreflight emits one JSON object with
snapshot{id,date}, destination{installed,running,
disk_free_kb}, collision{occurs,default_action,
pre_backup_default}, url_rewrite{default_action,
per_app_opt_out}, warnings[], errors[].
Exit 0 on usable preflight, 1 on hard error.
migrate_url_rewrite.sh— Host-bound CFG_<APP>_* fields (URL/HOST/DOMAIN/
DOMAIN_PREFIX/HOSTNAME/PUBLIC_URL) get rewritten
from the destination's install-template after
restore — so a moved app stops claiming the
source's hostnames. Per-app opt-out via
CFG_<APP>_MIGRATE_URL_REWRITE=false. All other
fields (DB passwords, API keys, prefs) carry
over from the source unchanged.
migrate_pre_backup.sh — migratePreBackupDestination takes a snapshot of
the destination's existing <app> (tagged
pre-migrate=<UTC timestamp>) before the wipe.
Default ON; opt-out with --no-pre-backup. Safety
net for the always-replace collision policy.
migrate_apply.sh — migrateApplyApp / migrateApplySystem. Parses
--no-pre-backup / --keep-urls / --json-progress
opts, runs preflight → pre-backup → restoreAppStart
(existing flow) → URL rewrite → re-deploy compose.
migrateApp / migrateSystem kept as shims so the
old CLI surface still works.
CLI dispatcher (cli_restore_commands.sh + cli_restore_header.sh):
Existing 'restore migrate app/system/discover' calls all still work.
New verbs:
restore migrate list <host> [loc_idx]
restore migrate preflight <host> <app> [loc_idx] ← JSON, for the WebUI
Design choices baked in (per the spec):
- Always-replace collision (no multi-install of an app), safety net is the
on-by-default pre-migrate backup.
- URL rewrite by host-bound suffix list, not per-field allowlist — works
out-of-the-box for new apps without extra config.
- migrateEmit fd-3 contract is what Phase 1's WebUI will stream; falls
back to stdout in interactive CLI so dev/debug just works.
- Transport-agnostic: nothing in this kernel knows whether the backup
location is local/SSH/S3/Connect — engineSnapshotsJson + engineBackupApp
do that, so Connect (the future blind-relay) plugs in as 'just another
location kind' with zero kernel changes.
Smoke-tested: all 13 public functions register; JSON emit produces correct
escaping (quoted strings vs bare numerics) and respects MIGRATE_JSON_PROGRESS.
Signed-off-by: librelad <librelad@digitalangels.vip>
A free, open, self-hosted app platform (GNU AGPLv3): one-click app deploys,
Traefik reverse proxy with automatic SSL, rootless Docker support, gluetun
VPN routing, and a web dashboard to manage it all.
Free & open forever to self-host; optional paid hosted services fund it.
See PROMISE.md.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
librelad