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finit/doc/cmdline.md
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Joachim Wiberg 35e4e0d073 Drop confusing splash cmdline and --enable-progress configure option 
This patch reverts back to the progress/status behavior of Finit < v3.0
because this is what most users expect, including the maintainer.  The
resulting code and configure script is a lot simpler to understand and
maintain:

- No more --enable-progress or --enable-progress-classic configure
  flags.  Instead a progress_style variable in helpers.c that can
  be changed at compile time for those that really need it.
- No more 'splash' kernel commnand line option.  This turned out to
  be *very* confusing to many users who believed it was some sort of
  graphical splash screen à la Plymouth.

Also, when Finit debug is enabled we now have a global 'debug' flag
which now alo controls if klogctl() should be called to prevent the
kernel logs to the console or not.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
2021-02-14 20:11:08 +01:00

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Tips & Tricks with the kernel cmdline

This document summarizes the different boot parameters that can be passed on the Linux kernel command line. Not limited to Finit.

  • debug__ Enable kernel debug. Debug messages are printed to the console until Finit starts up, the syslog daemon then empties /dev/kmsg

  • init=/bin/sh
    Bypass system default init and tell kernel to start a shell. Note, this shell is very limited and does not support signals and has no job control. Recommend using, and modifying, rescue mode instead.

  • panic=SEC
    By default the kernel does not reboot after a kernel panic. This setting will cause a kernel reboot after SEC seconds.

  • quiet
    Suppress kernel logging to console, except for warnings and errors.

  • rescue
    Start Finit rescue mode; no network, no fsck of file systems in /etc/fstab, no /etc/rc.local, no runparts. The configuration is read from /etc/rescue.conf, can be modified by the operator.

  • single, or S
    Single user mode, runlevel 1, in Finit. Useful to debug problems with the regular runlevel. All services and TTYs in [1] will be started, so a tty [1] @console nologin configuration presents you with a root console without login.

For more on kernel boot paramaters, see the man page bootparam(7).

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