Messages in this thread Patch in this message | | | From | Pawel Plociennik <> | Subject | [PATCH] chroot= as a new kernel parameter | Date | Sat, 1 Mar 2008 14:09:59 -0500 |
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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.
PS: be sure that you have added my e-mail in a CC because I am not subscribed to the lkml and ... I sorry but my English can be little incorrect because it is not my *native* language :-( please do not ignore me if I have been done some inccorect thing.
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(sys_chroot(chroot_str) < 0) + printk("chroot=%s failed\n", chroot_str); + else + printk("chroot=%s successed\n",chroot_str); + } argv_init[0] = init_filename; kernel_execve(init_filename, argv_init, envp_init); }
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