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From: Pawel Plociennik <paplociennik@gmail.com>
To: "Guillaume Chazarain" <guichaz@gmail.com>
Subject: Re: [PATCH] chroot= as a new kernel parameter
Date: Wed, 5 Mar 2008 08:38:03 -0500
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Cc: "Pavel Machek" <pavel@ucw.cz>, linux-kernel@vger.kernel.org
References: <200803011409.59526.paplociennik@gmail.com> <20080303141203.GB12606@elf.ucw.cz> <3d8471ca0803030719x418f9997tc428344e659a6c90@mail.gmail.com>
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On Monday 03 March 2008 10:19, Guillaume Chazarain wrote:
>
> init=/working_distro/lib/ld-linux.so.2 --library-path
> /working_distro/lib  /working_distro/usr/sbin/chroot /working_distro/
> /sbin/init
> 
root=<root> init=/working_distro/lib/ld-linux.so.2 --library-path 
/working_distro/lib working_distro/usr/sbin/chroot /working_distro/ /sbin/init

I think that it is *interestly* hack but I am not sure that it will be an usable method for all of a distroes which exists on the world.
At last my patch is as simple as possible and it has *only* a *few lines of the code* and it can be used
as *independent* method to various *hundred* distroes.

root=<root> chroot=<chroot>

and it looks *beautiful* I think :-)

so I have sent a patch again which it has corrected a *coding style* and a new description in a kernel-parameters.txt file
(a suggestions for better description are welcome).
I think that this can be a *last version* of a patch.
Because I am *newbie* in a kernel hacking I hope that someone will had been written me what now with it ?
Maybe send this patch *directly* to *kernel guru* such as Andrew Morton which manages a -mm series ?


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	2008-03-04 09:51:52.000000000 -0500
@@ -381,6 +381,8 @@ and is between 256 and 4096 characters. 
 			Value can be changed at runtime via
 				/selinux/checkreqprot.
 	
+	chroot=		[KNL] change a root for an init process.
+
 	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	2008-03-05 08:23:32.000000000 -0500
@@ -755,8 +755,20 @@ 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(KERN_WARNING "chroot=%s failed\n", chroot_str);
+
 	argv_init[0] = init_filename;
 	kernel_execve(init_filename, argv_init, envp_init);
 }
--
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