| 21 May 2021 |
|  evils joined the room. | 08:47:40 |
| 4 Apr 2025 |
 gdamjan | I stand corrected https://docs.kernel.org/admin-guide/serial-console.html | 17:46:50 |
| 21 May 2021 |
|  Emil Karlson joined the room. | 08:55:14 |
| 4 Apr 2025 |
 ElvishJerricco | yea that's what I quoted from last night :) | 17:47:02 |
| 21 May 2021 |
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| 4 Apr 2025 |
| ElvishJerricco | I think systemd only logs to its systemd.log_target= parameter, which is (effectively) by default the console target, which I think means just /dev/console but might be all console= params. | 17:50:20 |
| 21 May 2021 |
|  colmeka joined the room. | 11:35:18 |
| 4 Apr 2025 |
| ElvishJerricco | But that's systemd's own log_* functions; I think it doesn't actually redirect its stdout / stderr at all. And I think the /etc/systemd/system-shutdown/ programs inherit systemd's stdout, which is why our shutdown script's message is no longer going to the serial console | 17:54:20 |
| 21 May 2021 |
 andi- | What is our current stance on DynamicUser=true with state directories on different disks/partitions? Mounting fileSystems to /var/lib/private/... has never been a great experience. | 14:58:22 |
| 4 Apr 2025 |
| ElvishJerricco | because I think systemd's stdout is just /dev/console, which is exactly one of the console= kernel params, which is now tty0 and not ttyS0 | 17:55:32 |
| ElvishJerricco | I could be wrong about like... all of that though | 17:56:14 |
| 21 May 2021 |
|  gkaply532 joined the room. | 16:18:57 |
| 4 Apr 2025 |
| ElvishJerricco | https://github.com/systemd/systemd/blob/c1b0e39ffd76ca14960d3253286d9590c36f00f2/src/basic/log.c#L123-L143
Ok, systemd opens /dev/console for logging and then moves the fd out of the < 3 range
| 18:06:33 |
| 21 May 2021 |
|  kalbasit joined the room. | 16:50:08 |
| ElvishJerricco joined the room. | 16:53:34 |
| 4 Apr 2025 |
| ElvishJerricco | ok but I think it's not actually using that function. Based on main() and log_open(), I think it's defaulting to setting the log target to kmsg for PID1, until the journal starts and it switches to that. At shutdown, based on become_shutdown(), PID1 execs systemd-shutdown with --log-target=kmsg. At no point is stdout or stderr redirected, meaning I think that PID1 and subprocesses like systemd generators or systemd-shutdown scripts will output to /dev/console, which only represents one tty, which is now tty0 in our VM tests | 22:04:40 |
| 21 May 2021 |
|  Emantor joined the room. | 16:55:28 |
| 4 Apr 2025 |
| ElvishJerricco | And that's why the systemd log output all looked pretty normal despite the change, with the barely noticeable exception that shutdown and generator scripts don't output to ttyS0 anymore | 22:05:25 |
| 21 May 2021 |
|  rosariopulella joined the room. | 19:43:13 |
| 4 Apr 2025 |
| ElvishJerricco | all in all, I think the fix is to have the test's shutdown script pipe its output to /dev/kmsg or something like that, which would have been the dumb workaround I would have used if I hadn't bothered to figure all this out | 22:06:52 |
| 21 May 2021 |
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| 4 Apr 2025 |
| ElvishJerricco | but now I feel better about it actually being a good fix :P | 22:07:00 |
| 21 May 2021 |
| Emantor changed their profile picture. | 20:42:52 |
| 4 Apr 2025 |
| ElvishJerricco | * ok but I think it's not actually using that function. Based on main() and log_open(), I think it's defaulting to setting the log target to kmsg for PID1 (which means this output goes to each type of console), until the journal starts and it switches to that. At shutdown, based on become_shutdown(), PID1 execs systemd-shutdown with --log-target=kmsg. At no point is stdout or stderr redirected, meaning I think that PID1 and subprocesses like systemd generators or systemd-shutdown scripts will output to /dev/console, which only represents one tty, which is now tty0 in our VM tests | 22:09:21 |
| 21 May 2021 |
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