A RETURN trap is not scoped to the function that installs it. perform_update
left its trap referencing function-local installer_tmp/signature_tmp (and
service_name/service_was_active) installed, so it re-ran when a later function
returned. With those locals gone and 'set -u' active, the updater aborted with
'installer_tmp: unbound variable' immediately after logging 'Auto-update check
completed' — pulse-update.service entered failed state even though the update
had succeeded (reported #2128, affects v6.3.2/v6.4.1).
Disarm the trap with 'trap - RETURN' on its first invocation, and use
${installer_tmp:-}/${signature_tmp:-} so a stray invocation cannot abort the
script. Add a regression test asserting no RETURN trap remains after both the
successful and the prerelease-refusal paths.
Change-source: pulse-maintainer
Two bugs from #1630 that combined to take installs down silently:
1. perform_update()'s install-failed rollback branch restored the backup
but never restarted pulse.service. Since the generated
pulse-update.service gates on ExecCondition=systemctl is-active,
every later timer run was then skipped and the install stayed down
until manual intervention. Restart is now guaranteed by a
service_was_active-guarded restart in that branch plus an
ensure_service_restarted RETURN trap so no exit path can miss it
(re-fix of #1323, originally c0b3a0e66, lost in 778a2577b and only
partially restored in 672e81985).
2. install.sh aborted under errexit when writing the /bin/update helper
on a read-only filesystem - after the new binary was installed and
the service stopped, landing in bug 1's no-restart branch. The stock
pulse-update.service uses ProtectSystem=strict, so /bin and
/usr/local/bin are read-only on stock unattended updates; transient
read-only remounts hit the same path. The helper write, PATH
appends, and the /usr/local/bin/pulse symlink are now idempotent and
non-fatal with a warning (install_binary_symlink).
Contract: deployment-installability now pins fail-closed service
availability for unattended updates and non-fatal writes outside the
hardened unit's writable set, with proofs in pulse_auto_update_test.go
and root_install_sh_test.go plus shell regression coverage in
scripts/tests/test-pulse-auto-update.sh (installer-exits-nonzero path)
and scripts/tests/test-install-update-resilience.sh (read-only helper
and symlink paths, verified under set -e, root-safe via ENOTDIR).
Fixes#1630
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Production telemetry (7d, 2026-07-17) shows a persistent tail of live
installs on 6.0.0-rc.x and 6.0.3/6.0.4 while 6.0.5 has been stable since
2026-07-09. Root cause for the reachable stranding class: release
selection trusted GitHub's created_at ordering, and this repo interleaves
v5-line maintenance releases with v6 releases (v5.1.36 was created the
day before v6.0.5). Whenever a v5.1.x release is the most recently
created stable:
- stable channel (getLatestReleaseForChannel) returned the first
non-prerelease in list order -> "no update" for every v6 install
until the next v6 release ships
- the RSS rate-limit fallback returned the first feed entry matching the
channel, same failure, both channels
- the unattended updater trusted /releases/latest, which GitHub defines
as most-recently-created stable -> timer no-ops in the same window
All three now select the highest eligible version: the API path tracks
newest stable + newest prerelease in one pass (prerelease = GitHub flag
OR tag shape), the feed fallback picks the max matching the channel, and
pulse-auto-update.sh scans /releases pairing each tag with its own
draft/prerelease flags before the fail-closed shape filter, keeping
/releases/latest as fallback. helm-chart-* tags fail semver parsing and
are dropped everywhere.
Verified not broken (pinned by new tests): rc-channel installs are
offered the newer stable (6.0.0-rc.6 -> 6.0.5) and move onto the next rc
line when one opens (-> 6.1.0-rc.2); the auto-update prerelease filter
(fail-closed is_prerelease_tag, metadata-flag refusal) still refuses
prerelease targets on stable. Go tests fail on the pre-fix code
(returned 5.1.37 / "no update").
Contract: deployment-installability now pins version-max release
selection with proofs in manager_stranded_upgrade_test.go and
pulse_auto_update_test.go.
Back-port the pulse-auto-update.sh half of v5 fix 0f2982ce3 to v6. After a
verified update, if Pulse was running beforehand, wait_for_service_active
polls up to 20s, tries one explicit start, and if it still does not come
back up restores the backup binary/VERSION, restarts, and returns failure
instead of leaving Pulse stopped (common on unprivileged LXC where the
installer's restart silently fails). Adds a BASH_SOURCE guard so the
script can be sourced, plus scripts/tests/test-pulse-auto-update.sh.
Note: the install.sh start_pulse STOPPED_PULSE_SERVICE guard (interactive
installer path) still needs the stop-tracking infrastructure wired into
v6's update flow; tracked as a follow-up.
