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Why changes to inittab, call telinit u during halt/reboot?
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pjp
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PostPosted: Wed Mar 13, 2019 10:41 pm    Post subject: Why changes to inittab, call telinit u during halt/reboot? Reply with quote

Code:
$ diff /etc/inittab /etc/._cfg0000_inittab
23c23,24
< l0:0:wait:/sbin/openrc shutdown
---
> l0u:0:wait:/sbin/telinit u
> l0:0:wait:/sbin/openrc shutdown
29a31
> l6u:6:wait:/sbin/telinit u
man telinit wrote:
U or u tell init to re-execute itself (preserving the state). No re-examining of /etc/inittab file happens. Runlevel should be one of
Ss0123456 otherwise request would be silently ignored.
It doesn't appear that upstream provides a default inittab, and the statement of the obvious (call telinit u when halting or rebooting) isn't helpful with the important part, why the change was made.

So, does anyone have an idea why this might have been done? It kind of seems kludgy.
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Ant P.
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PostPosted: Thu Mar 14, 2019 9:22 pm    Post subject: Reply with quote

If you're unmounting filesystems, /sbin/init will usually be the last open filehandle after killall5's done its work. Possibly this is an attempt to release that FH so a full unmount can be done (on brittle filesystems like ext2, which don't like being mounted when the system goes down). Also, it's been a while since I touched this stuff, but I think initramfs/pivot_root has similar weird implications.
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pjp
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PostPosted: Fri Mar 15, 2019 3:05 am    Post subject: Reply with quote

Thanks, that sounds plausible.

It had the feel of "adjusting" a tube TV by whacking it :)
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