#!/bin/sh
. /lib/dracut-lib.sh
[ -f /tmp/root.info ] && . /tmp/root.info
PATH=$PATH:/sbin:/usr/sbin
if getarg rdlivedebug; then
exec > /tmp/liveroot.$$.out
exec 2>> /tmp/liveroot.$$.out
set -x
fi
[ -z "$1" ] && exit 1
livedev="$1"
# parse various live image specific options that make sense to be
# specified as their own things
live_dir=$(getarg live_dir)
[ -z "$live_dir" ] && live_dir="LiveOS"
getarg live_ram && live_ram="yes"
getarg no_eject && no_eject="yes"
getarg reset_overlay && reset_overlay="yes"
getarg readonly_overlay && readonly_overlay="--readonly" || readonly_overlay=""
overlay=$(getarg overlay)
# FIXME: we need to be able to hide the plymouth splash for the check really
[ -e $livedev ] & fs=$(blkid -s TYPE -o value $livedev)
if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then
check="yes"
fi
getarg check || check=""
if [ -n "$check" ]; then
checkisomd5 --verbose $livedev || :
if [ $? -ne 0 ]; then
die "CD check failed!"
exit 1
fi
fi
getarg ro && liverw=ro
getarg rw && liverw=rw
[ -z "$liverw" ] && liverw=ro
# mount the backing of the live image first
mkdir -p /dev/.initramfs/live
mount -n -t $fstype -o $liverw $livedev /dev/.initramfs/live
RES=$?
if [ "$RES" != "0" ]; then
die "Failed to mount block device of live image"
exit 1
fi
# overlay setup helper function
do_live_overlay() {
# create a sparse file for the overlay
# overlay: if non-ram overlay searching is desired, do it,
# otherwise, create traditional overlay in ram
OVERLAY_LOOPDEV=$( losetup -f )
l=$(blkid -s LABEL -o value $livedev) || l=""
u=$(blkid -s UUID -o value $livedev) || u=""
if [ -z "$overlay" ]; then
pathspec="/${live_dir}/overlay-$l-$u"
elif ( echo $overlay | grep -q ":" ); then
# pathspec specified, extract
pathspec=$( echo $overlay | sed -e 's/^.*://' )
fi
if [ -z "$pathspec" -o "$pathspec" = "auto" ]; then
pathspec="/${live_dir}/overlay-$l-$u"
fi
devspec=$( echo $overlay | sed -e 's/:.*$//' )
# need to know where to look for the overlay
setup=""
if [ -n "$devspec" -a -n "$pathspec" -a -n "$overlay" ]; then
mkdir /overlayfs
mount -n -t auto $devspec /overlayfs || :
if [ -f /overlayfs$pathspec -a -w /overlayfs$pathspec ]; then
losetup $OVERLAY_LOOPDEV /overlayfs$pathspec
if [ -n "$reset_overlay" ]; then
dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 2>/dev/null
fi
setup="yes"
fi
umount -l /overlayfs || :
fi
if [ -z "$setup" ]; then
if [ -n "$devspec" -a -n "$pathspec" ]; then
warn "Unable to find persistent overlay; using temporary"
sleep 5
fi
dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((512*1024)) 2> /dev/null
losetup $OVERLAY_LOOPDEV /overlay
fi
# set up the snapshot
echo 0 `blockdev --getsz $BASE_LOOPDEV` snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV p 8 | dmsetup create $readonly_overlay live-rw
}
# live cd helper function
do_live_from_base_loop() {
do_live_overlay
}
# we might have a genMinInstDelta delta file for anaconda to take advantage of
if [ -e /dev/.initramfs/live/${live_dir}/osmin.img ]; then
OSMINSQFS=/dev/.initramfs/live/${live_dir}/osmin.img
fi
if [ -n "$OSMINSQFS" ]; then
# decompress the delta data
dd if=$OSMINSQFS of=/osmin.img 2> /dev/null
OSMIN_SQUASHED_LOOPDEV=$( losetup -f )
losetup -r $OSMIN_SQUASHED_LOOPDEV /osmin.img
mkdir -p /squashfs.osmin
mount -n -t squashfs -o ro $OSMIN_SQUASHED_LOOPDEV /squashfs.osmin
OSMIN_LOOPDEV=$( losetup -f )
losetup -r $OSMIN_LOOPDEV /squashfs.osmin/osmin
umount -l /squashfs.osmin
fi
# we might have just an embedded ext3 to use as rootfs (uncompressed live)
if [ -e /dev/.initramfs/live/${live_dir}/ext3fs.img ]; then
EXT3FS="/dev/.initramfs/live/${live_dir}/ext3fs.img"
fi
if [ -n "$EXT3FS" ] ; then
BASE_LOOPDEV=$( losetup -f )
losetup -r $BASE_LOOPDEV $EXT3FS
do_live_from_base_loop
fi
# we might have an embedded ext3 on squashfs to use as rootfs (compressed live)
if [ -e /dev/.initramfs/live/${live_dir}/squashfs.img ]; then
SQUASHED="/dev/.initramfs/live/${live_dir}/squashfs.img"
fi
if [ -e "$SQUASHED" ] ; then
if [ -n "$live_ram" ] ; then
echo "Copying live image to RAM..."
echo "(this may take a few minutes)"
dd if=$SQUASHED of=/squashed.img bs=512 2> /dev/null
umount -n /dev/.initramfs/live
echo "Done copying live image to RAM."
if [ ! -n "$no_eject" ]; then
eject -p $livedev || :
fi
SQUASHED="/squashed.img"
fi
SQUASHED_LOOPDEV=$( losetup -f )
losetup -r $SQUASHED_LOOPDEV $SQUASHED
mkdir -p /squashfs
mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /squashfs
BASE_LOOPDEV=$( losetup -f )
losetup -r $BASE_LOOPDEV /squashfs/LiveOS/ext3fs.img
umount -l /squashfs
do_live_from_base_loop
fi
if [ -b "$OSMIN_LOOPDEV" ]; then
# set up the devicemapper snapshot device, which will merge
# the normal live fs image, and the delta, into a minimzied fs image
echo "0 $( blockdev --getsz $BASE_LOOPDEV ) snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV p 8" | dmsetup create --readonly live-osimg-min
fi
ROOTFLAGS="$(getarg rootflags)"
if [ -n "$ROOTFLAGS" ]; then
ROOTFLAGS="-o $ROOTFLAGS"
fi
ln -fs /dev/mapper/live-rw /dev/root
printf '/bin/mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > /mount/01-$$-live.sh
