#!/bin/sh
#
# Licensed under the GPLv2
#
# Copyright 2008, Red Hat, Inc.
# Jeremy Katz <katzj@redhat.com>

emergency_shell()
{
    echo ; echo
    echo "Bug in initramfs /init detected. Dropping to a shell. Good luck!"
    echo
    sh < /dev/console
}

getarg() {
    local o;
    for o in $(cat /proc/cmdline); do
	[ "${o%%=*}" = "$1" ] && { echo $o; break; }
    done
    return 1
}

source_all() {
    local f
    [ "$1" ] && [  -d "/$1" ] || return
    for f in "/$1"/*; do [ -f "$f" ] && . "$f"; done
}

echo "Starting initrd..."
export PATH=/sbin:/bin:/usr/sbin:/usr/bin
export TERM=linux

trap "emergency_shell" 0
# /dev/console comes from the built-in initramfs crud in the kernel
# someday, we may need to mkdir /dev first here
exec > /dev/console 2>&1 < /dev/console

# mount some important things
mount -t proc /proc /proc
mount -t sysfs /sys /sys
mount -t tmpfs -omode=0755 udev /dev

# FIXME: what device nodes does plymouth really _need_ ?
mknod /dev/ptmx c 5 2
mknod /dev/console c 5 0
mknod /dev/fb c 29 0
mkdir /dev/pts
mount -t devpts -o gid=5,mode=620 /dev/pts /dev/pts
mknod /dev/tty0 c 4 0
mknod /dev/tty1 c 4 1
mknod /dev/null c 1 3

source_all pre-udev

# start up udev and trigger cold plugs
udevd --daemon
udevadm trigger >/dev/null 2>&1

# mount the rootfs
NEWROOT="/sysroot"

# FIXME: there's got to be a better way ...
# it'd be nice if we had a udev rule that just did all of the bits for
# figuring out what the specified root is and linking it /dev/root
root=$(getarg root); root=${root#root=}
case $root in
    LABEL=*) root=${root#LABEL=}
             root=${root//\//\\x2f}
	     root="/dev/disk/by-label/${root}" ;;
    UUID=*) root="/dev/disk/by-uuid/${root#UUID=}" ;;
    '') echo "Warning: no root specified"
	root="/dev/sda1" ;;
esac

# should we have a timeout?
tries=0
echo "Waiting up to 30 seconds for $root to become available"
udevadm settle --timeout=30
source_all pre-mount

echo "Trying to mount rootfs $root"
[ -e "$root" ] || emergency_shell
ln -s "$root" /dev/root    
mount -o ro /dev/root $NEWROOT || emergency_shell

# now we need to prepare to switchroot
mount --bind /dev $NEWROOT/dev

# FIXME: now for a bunch of boiler-plate mounts.  really, we should have 
# some like /etc/fstab.sys that's provided by filesystem/initscripts
# and then do mount -f /etc/fstab.sys -a
mount -t proc /proc $NEWROOT/proc
mount -t sysfs /sys $NEWROOT/sys

source_all pre-pivot

# kill off udev
kill $(pidof udevd)

# FIXME: nash die die die
exec switch_root
# davej doesn't like initrd bugs
echo "Something went very badly wrong in the initrd.  Please "
echo "file a bug against mkinitrd."
sleep 100d
exit 1