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/**
qemuinit; init for quick boot inside qemu.
Copyright 2009 Junichi Uekawa
This init is dedicated for qemubuilder use, with goal of having a
very fast boot time by only initializing the essential modules
required for qemubuilder operation.
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/reboot.h>
#include "../parameter.h"
#include "../file.h"
#define PBUILDER_MOUNTPOINT "/var/cache/pbuilder/pbuilder-mnt"
#define ROOT_MOUNTPOINT "/root"
/* global variable to hold /proc/cmdline */
char* proc_cmdline = NULL;
void read_proc_cmdline()
{
int fd = open("/proc/cmdline", O_RDONLY);
char buf[BUFSIZ];
int len=read(fd, buf, sizeof(buf)-1);
buf[len]=0; /* make sure it's NULL-terminated */
proc_cmdline=strdup(buf);
close(fd);
}
/* parse the command-line option, and return a pointer to
space-delimited option string */
const char* parse_option(const char* option)
{
const char* s = proc_cmdline;
do {
if (!strncmp(option, s, strlen(option)) &&
s[strlen(option)] == '=')
return s;
} while((s=strchr(s, ' ')));
return NULL;
}
/*
Return a strdup string, optionally NULL-terminating if it's
space-delimited.
*/
char* strdup_spacedelimit(const char* str)
{
char* s = strdup(str);
char* space = strchr(str, ' ');
if (space) *space = 0;
return s;
}
/*
insert module and display error message when insmod returns an
error.
*/
int insmod(const char* module)
{
int ret=forkexeclp("/bin/insmod", "/bin/insmod", module, NULL);
if (ret)
{
fprintf(stderr, "W: insmod of %s returned %i\n",
module,
ret);
}
return ret;
}
int main(int argc, char** argv)
{
printf(" -> qemu-pbuilder first-stage(initrd version)\n");
umask(S_IWGRP | S_IWOTH);
chdir("/");
setenv("PATH", "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", 1);
setenv("PBUILDER_MOUNTPOINT", PBUILDER_MOUNTPOINT, 1);
mkdir("/root", 0777); /* mountpoint */
mkdir("/proc", 0777);
mkdir("/dev", 0777);
mkdir("/dev/pts", 0777);
if (mount("/proc", "/proc",
"proc", MS_MGC_VAL, NULL) == -1)
{
perror("mount proc");
}
if (mount("/dev/pts", "/dev/pts",
"devpts", MS_MGC_VAL, NULL) == -1)
{
perror("mount devpts");
}
read_proc_cmdline();
/* ext3 driver */
insmod("lib/modules/linux-live/kernel/drivers/ide/ide-core.ko");
insmod("lib/modules/linux-live/kernel/drivers/ide/ide-disk.ko");
insmod("lib/modules/linux-live/kernel/drivers/ide/ide-generic.ko");
insmod("lib/modules/linux-live/kernel/fs/mbcache.ko");
insmod("lib/modules/linux-live/kernel/fs/jbd/jbd.ko");
insmod("lib/modules/linux-live/kernel/fs/ext2/ext2.ko");
insmod("lib/modules/linux-live/kernel/fs/ext3/ext3.ko");
sleep(1);
/* ne2k driver */
insmod("lib/modules/linux-live/kernel/drivers/net/8390.ko");
insmod("lib/modules/linux-live/kernel/drivers/net/ne2k-pci.ko");
/* ARM would need different driver... smc */
if (copy_file("/proc/mounts", "/etc/mtab"))
{
fprintf(stderr, "Cannot copy file /proc/mounts to /etc/mtab.\n");
}
mknod_inside_chroot("", "dev/sda", S_IFBLK | 0660, makedev(8, 0));
mknod_inside_chroot("", "dev/sdb", S_IFBLK | 0660, makedev(8, 16));
mknod_inside_chroot("", "dev/hda", S_IFBLK | 0660, makedev(3, 0));
mknod_inside_chroot("", "dev/hdb", S_IFBLK | 0660, makedev(3, 64));
if (mount("/dev/sda", ROOT_MOUNTPOINT, "ext3",
MS_MGC_VAL, NULL) == -1)
{
perror("mount root device try sda");
if (mount("/dev/hda", ROOT_MOUNTPOINT, "ext3",
MS_MGC_VAL, NULL) == -1)
{
perror("mount root device try hda");
}
}
if (mount("/dev/sdb",
ROOT_MOUNTPOINT PBUILDER_MOUNTPOINT,
"ext3", MS_MGC_VAL, NULL) == -1)
{
perror("mount command device try sdb");
if (mount("/dev/hdb",
ROOT_MOUNTPOINT PBUILDER_MOUNTPOINT,
"ext3", MS_MGC_VAL, NULL) == -1)
{
perror("mount command device try hdb");
}
}
/* debug shell to see what's there. */
printf("command-line inside initrd, exit to continue\n");
forkexeclp("/bin/sh", "/bin/sh", NULL);
if (chroot("root/"))
{
perror("chroot");
}
if (chdir("/"))
{
perror("chdir");
}
forkexeclp("bin/sh", "bin/sh", PBUILDER_MOUNTPOINT "/pbuilder-run", NULL);
/* debug shell inside chroot. */
printf("command-line inside chroot, exit to continue\n");
forkexeclp("bin/sh", "bin/sh", NULL);
/* turn the machine off */
sync();
sync();
reboot(RB_POWER_OFF);
return 0;
}
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