I managed to create a small and fully functional live Linux CD which contains only kernel (compiled with default options) and BusyBox (compiled with default options + static, all applets present, including
/sbin/init). I had no issues to create
initrd and populate
/sys and also I had no issues at all with my
/init shell script.
Recently I read that BusyBox supports
/etc/inittab configurations (at least to some level) and I very much would like to do either of the following:
- Forget about my
/initshell script and rely entirely on
- Use both
/initshell script and
Now the actual problem - it seems that
/etc/inittab is completely ignored when my distro boots up. The symptoms are:
- When I remove
/initand leave only
/etc/inittabI end up with kernel panic. My assumption is that kernel doesn't execute
/sbin/initat all, or that
/sbin/initdoesn't find (or read)
- I read that BusyBox should work fine even without
/etc/inittab. So, I removed both
/etc/inittaband guess what - kernel panic again.
- I tried to execute
/sbin/initfrom my shell and after several guesses which included
exec setsid /sbin/initI ended up with kernel panic. Both with and without /etc/inittab being present on the file system.
Here is the content of my
/init shell script:
#!/bin/sh dmesg -n 1 mount -t devtmpfs none /dev mount -t proc none /proc mount -t sysfs none /sys setsid cttyhack /bin/sh
At this point I don't care what the content of the
/etc/inittab would be, as long as I have a way to know that the configuration there actually works. I tried several
/etc/inittab configurations, all based on the information which I found here.
As a bare minimum my /etc/inittab contained just this one line:
Again - I ended up with kernel panic and it seems that
/etc/inittab was ignored.
Any suggestions how to force my little live distro to work fine with BusyBox's
/etc/inittab are highly appreciated!
- Just to make it clear - I do not have kernel panic troubles with my current
/initshell script both with and without
/etc/inittab. It all works fine, my
/bin/ashconsole works great and I don't experience any unexpected troubles. The only issue is that
/etc/inittabis completely ignored, as I described above.
- I examined 3 different live Linux distributions: Slax, Finnix and SysResCD. All of them have
/initand none of them have
/etc/inittab. In addition this Wiki article concludes my suspicion that
/sbin/initis not invoked at all.