It is refreshing to see that the Cylon eye is appearantly no longer
making the Ctrl-Alt-F9 emergency shell unusable.
It being a nice gimmick had the less desirable side-effect of spamming
the F9 shell, rendering it useless. Cylon was mentioned a few times on
this mailing-list over the years (was on TO-DO list for a while) and the
issue popped up in several other places. Relief seems to be here now!
In case, anybody still needs to fix it, say on an old installation, one
can follow below links, where the Cylon is simply patched out /
commented out and thus shuts up for good. On stackExchange, they knew no
better than censoring that post, though.
references:
https://github.com/systemd/systemd/blob/fb4b0465abbd96e6d342e5606c61c919c99a82ff/src/core/manager.c#L229
https://unix.stackexchange.com/questions/481123/make-systemd-debug-shell-usable-again/556410#556410
https://unix.stackexchange.com/questions/556196/fix-dreaded-a-stop-job-is-running-cylon-animation-garbling-systemd-debug-shell?noredirect=1
containing:
The offending line is in systemD where a "cylon" animation garbles the
F9 console, so the function call needed to be commented out here.
The Source mentions protection against garbling ("screwing" acc. to
src), but that is sort of feckless here and patching the function-call
out is quick to do.
Maybe one can manually set manager_is_confirm_spawn_disabled to get rid
of that obnoxious cylon or simply return immediately until someone fixes
this. That dreaded linked src line has cost users much wasted time.
The systemd.debug_shell on Alt-F9 is almost useless here, because its
screen gets garbled with that animated coloured gizmo (named "cylon" in
above src link) and repeatedly updated message: "A stop job is running
on ..."
The unit file has
StandardInput=tty
systemctl enable debug-shell.service # to activate F9-sh
The input is subject to that "spam". How can I get rid of that animated
nuisance of a notifier? Can hardly imagine I am the only one suffering
from this kind of obvious problem.
Can I change the "fd" file descriptors of the shell to get rid of the
spam by systemD?
A kernel commandline like
linux /boot/vmlinuz-5.4-x86_64 root=UUID=31…… rw
bootflags=subvol="whatever" udev.log_priority=3 audit=0
systemd.log_level=debug systemd.log_target=kmsg
systemd.StandardError=null
does nothing to remedy the spam either after os-prober
# /etc/systemd/system.conf
# Generated by kcmsystemd control module v1.2.1.
[Manager]
DefaultStandardOutput=journal
DefaultStandardError=journal
is equally futile.
original post link =
https://unix.stackexchange.com/questions/556196/dreaded-a-stop-job-is-running-cylon-animation-garbled-systemd-debug-shell-on-a?noredirect=1
So, to defeat the dreaded cylon, I made line 196 near the above link
read "return ;" compiled, installed… and disposed of the cylon for good.
Darth Vader wins! Maybe someone finds an alternative way to get the same
result via kernel commandline ...tty.... or improving the C code to keep
clean the Alt-F9 shell.
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