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pid1: make clear that $WATCHDOG_USEC is set for the shutdown binary, noone else

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We use the $WATCHDOG_USEC variable for two very closely uses: as part of
the sd_watchdog_enabled() protocol for implementing service watchdogs.
And as part of the protocol between the service manager and
systemd-shutdown across the PID 1 execve() transition during shutdown.

Apparently some exitrds tools got confused by the latter use. Let's
address that by setting $WATCHDOG_PID to 1, in accordance to the
sd_watchdog_enabled() protocol to make clear this is only intended for
PID 1 and nothing else.

Replaces: #35135
This commit is contained in:
Lennart Poettering 2024-11-14 23:16:19 +01:00 committed by Luca Boccassi
parent 1a077e05fb
commit 4b20ae9a0e
1 changed files with 5 additions and 0 deletions
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5
src/core/main.c
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@ -1689,6 +1689,11 @@ static int become_shutdown(int objective, int retval) {
/* Tell the binary how often to ping, ignore failure */
(void) strv_extendf(&env_block, "WATCHDOG_USEC="USEC_FMT, watchdog_timer);
/* Make sure that tools that look for $WATCHDOG_USEC (and might get started by the exitrd) don't get
* confused by the variable, because the sd_watchdog_enabled() protocol uses the same variable for
* the same purposes. */
(void) strv_extendf(&env_block, "WATCHDOG_PID=" PID_FMT, getpid_cached());
if (arg_watchdog_device)
(void) strv_extendf(&env_block, "WATCHDOG_DEVICE=%s", arg_watchdog_device);