Finishes the deferred half of the v5->v6 parity fix for #1323 (the
pulse-auto-update.sh half landed in 672e81985). The interactive install.sh
update/reinstall flow stopped a running Pulse then called start_pulse, which
tolerates a silent start failure (common on unprivileged LXC) by printing a note
and returning 0 — leaving Pulse stopped under an "installation completed!" message.
- stop_pulse_for_update records whether Pulse was running before the update.
- start_pulse, only when Pulse was running before (PULSE_WAS_ACTIVE), no longer
accepts a silent start failure: it verifies the service became active
(wait_for_service_active, 20s), retries one explicit start, and surfaces a clear
error + diagnostics if it still will not come up. Fresh installs are unchanged
(the flag stays false, so the reassuring container note is kept).
- Wired into all three update/reinstall sites; added a BASH_SOURCE guard so the
installer's functions can be unit-tested without running the installer.
Scope: fixes the #1323 'restart silently failed' case. Does NOT add a binary
rollback (download_pulse deletes bin/pulse.old right after the swap) — a
bad-release rollback is a separate concern.
Test: scripts/tests/test-install-update-resilience.sh (sources install.sh, stubs
systemctl, asserts was-active capture + retry + clear error). Go installtests +
bash -n confirm the guard does not change installer execution.
1a42011724