Date: Tue, 24 Aug 2010 10:03:09 +0200 From: Ed Schouten <ed@80386.nl> To: Marcel Moolenaar <xcllnt@mac.com> Cc: "freebsd-arch@FreeBSD.org" <freebsd-arch@FreeBSD.org> Subject: Re: RFC: enhancing the root mount logic Message-ID: <20100824080309.GK64651@hoeg.nl> In-Reply-To: <20100824080128.GJ64651@hoeg.nl> References: <AFBE2FCA-30A6-4E1D-A964-AC4DC4C843EB@juniper.net> <20100823.171201.107001114053031707.imp@bsdimp.com> <8C76250B-E272-4807-BD0D-9F50D0BC5E10@mac.com> <20100824002350.042A45B3B@mail.bitblocks.com> <4CB9F7C8-39E8-4C3B-A3F8-A5A9EC178E7D@mac.com> <20100824080128.GJ64651@hoeg.nl>
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[-- Attachment #1 --]
* Ed Schouten <ed@80386.nl> wrote:
> See the attachment.
It seems like Mailman ate the attachment.
%%%
/*-
* Copyright (c) 2010 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/mount.h>
#include <sys/uio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static void
die(const char *msg)
{
int fd, serrno;
serrno = errno;
fd = open("/dev/console", O_RDWR);
if (fd != -1 && fd != STDERR_FILENO)
dup2(fd, STDERR_FILENO);
errno = serrno;
perror(msg);
sleep(10);
exit(1);
}
static void
domount(const char * const list[], unsigned int elems)
{
struct iovec iov[elems];
unsigned int i;
for (i = 0; i < elems; i++) {
iov[i].iov_base = (char *)list[i];
iov[i].iov_len = strlen(list[i]) + 1;
}
if (nmount(iov, elems, 0) != 0)
die(list[1]);
}
static char const * const cdfs[] = {
"fstype", "cd9660", "from", "/dev/iso9660/freebsd", "fspath", "/ro"
};
static char const * const tmpfs[] = {
"fstype", "tmpfs", "fspath", "/rw"
};
static char const * const unionfs[] = {
"fstype", "unionfs", "from", "/ro", "fspath", "/rw", "below", "",
"whiteout", "whenneeded"
};
static char const * const devfs[] = {
"fstype", "devfs", "fspath", "/rw/dev"
};
int
main(int argc, char *argv[])
{
/* Prevent foot shooting. */
if (getpid() != 1)
return (1);
/* Perform mounts. */
domount(cdfs, sizeof cdfs / sizeof(char *));
domount(tmpfs, sizeof tmpfs / sizeof(char *));
domount(unionfs, sizeof unionfs / sizeof(char *));
domount(devfs, sizeof devfs / sizeof(char *));
/* chroot() into system and continue boot process. */
if (chroot("/rw") != 0)
die("chroot");
chdir("/");
/* Execute the real /sbin/init. */
execv(argv[0], argv);
die("execv");
return (1);
}
%%%
--
Ed Schouten <ed@80386.nl>
WWW: http://80386.nl/
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