Messages in this thread | | | Date | Sun, 2 Mar 2008 16:35:04 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH] chroot= as a new kernel parameter |
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Hi!
> hi *real* hackers,
:-).
> it is a my first post to lkml and I hope that you will have not been > ignored me if I have done some incorrect thing. > > In the short this patch has added a new chroot= kernel parameter which can be used > to changing a chroot of an init process before it will has been runed. > I use that for testing variouses distroes without making a separate partition but > by copied a new root-fs to a new subdirectory on the my *base* filesystem.
Yes please. I was thinking about doing this long ago, but never got to coding it.
> diff -urp linux-2.6.24-orig/Documentation/kernel-parameters.txt linux-2.6.24/Documentation/kernel-parameters.txt > --- linux-2.6.24-orig/Documentation/kernel-parameters.txt 2008-02-25 20:53:26.000000000 -0500 > +++ linux-2.6.24/Documentation/kernel-parameters.txt 2008-02-25 20:51:21.000000000 -0500 > @@ -381,6 +381,8 @@ and is between 256 and 4096 characters. > Value can be changed at runtime via > /selinux/checkreqprot. > > + chroot= [KNL] call chroot() for init proccess. > + > clock= [BUGS=X86-32, HW] gettimeofday clocksource override. > [Deprecated] > Forces specified clocksource (if available) to be used > diff -urp linux-2.6.24-orig/init/main.c linux-2.6.24/init/main.c > --- linux-2.6.24-orig/init/main.c 2008-03-01 12:58:37.000000000 -0500 > +++ linux-2.6.24/init/main.c 2008-02-25 20:36:06.000000000 -0500 > @@ -755,8 +755,22 @@ static void __init do_pre_smp_initcalls( > spawn_softlockup_task(); > } > > +static void *chroot_str; > +static int __init chroot_setup(char *str) > +{ > + chroot_str = str; > + return 1; > +} > +__setup("chroot=", chroot_setup); > + > static void run_init_process(char *init_filename) > { > + if(chroot_str) {
'if ('
> + if(sys_chroot(chroot_str) < 0)
here too.
> + printk("chroot=%s failed\n", chroot_str); > + else > + printk("chroot=%s successed\n",chroot_str);
And I do not think we want to printk in the success case.
Thanks, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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