wt/finit

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Joachim Wiberg cc6ffa35fc Drop parsing of /proc/cmdline by default, instead use argc + argv[]

For most use-cases the kernel will give Finit its arguments as proper
command line args in argc + argv[], like any other program.  However,
for some users, most notably Alpine Linux, there is a slightly broken
initramfs that cannot forward more than one argument using init_args,
for such systems you can re-enable the old behavior with a configure
switch --enable-kernel-cmdline -- it's not ideal but what can you do.

The main reason for removing this feature by default is to support
use-cases where Finit runs as the init for container apps that can read
/proc -- we do not want them to use the init args from the host.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

2021-05-31 16:51:08 +02:00

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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.

The bool setting is one of on, off, true false, 1, 0.

NOTE: remember to use -- to separate kernel parameters from parameters to init. E.g., init=/sbin/finit -- finit.debug rescue

debug: Enable kernel debug. Debug messages are printed to the console until Finit starts up.
finit.debug[=bool]: Enable finit debug. This is operated independently of the kernel debug setting. New as of Finit v4.
finit.show_status[=bool]: Control finit boot progress, including banner.
finit.status_style=<classic,modern>: Set Finit boot progress style, when enabled.
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 rescue/maintenance mode. If your system comes with the bundled sulogin program (Finit, or from util-linux/Busybox), you will be given a root login to a maintenance shell. However, if sulogin is missing, the file /lib/finit/rescue.conf is read and the system booted in a limited fallback mode. See [config.md][] for more information.
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)][].

[config.md][]: config.md#rescue-mode [bootparam(7)]: https://www.man7.org/linux/man-pages/man7/bootparam.7.html

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Tips & Tricks with the kernel cmdline

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