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182 lines
5.6 KiB
182 lines
5.6 KiB
#!/bin/sh |
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# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*- |
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# ex: ts=8 sw=4 sts=4 et filetype=sh |
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. /lib/dracut-lib.sh |
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[ -f /tmp/root.info ] && . /tmp/root.info |
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PATH=$PATH:/sbin:/usr/sbin |
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if getargbool 0 rd.live.debug -y rdlivedebug; then |
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exec > /tmp/liveroot.$$.out |
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exec 2>> /tmp/liveroot.$$.out |
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set -x |
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fi |
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[ -z "$1" ] && exit 1 |
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livedev="$1" |
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# parse various live image specific options that make sense to be |
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# specified as their own things |
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live_dir=$(getarg rd.live.dir live_dir) |
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[ -z "$live_dir" ] && live_dir="LiveOS" |
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getargbool 0 rd.live.ram -y live_ram && live_ram="yes" |
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getargbool 0 rd.live.overlay.reset -y reset_overlay && reset_overlay="yes" |
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getargbool 0 rd.live.overlay.readonly -y readonly_overlay && readonly_overlay="--readonly" || readonly_overlay="" |
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overlay=$(getarg rd.live.overlay overlay) |
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# FIXME: we need to be able to hide the plymouth splash for the check really |
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[ -e $livedev ] & fs=$(blkid -s TYPE -o value $livedev) |
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if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then |
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check="yes" |
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fi |
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getarg rd.live.check check || check="" |
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if [ -n "$check" ]; then |
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checkisomd5 --verbose $livedev || : |
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if [ $? -ne 0 ]; then |
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die "CD check failed!" |
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exit 1 |
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fi |
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fi |
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getarg ro && liverw=ro |
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getarg rw && liverw=rw |
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[ -z "$liverw" ] && liverw=ro |
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# mount the backing of the live image first |
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mkdir -p /dev/.initramfs/live |
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mount -n -t $fstype -o $liverw $livedev /dev/.initramfs/live |
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RES=$? |
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if [ "$RES" != "0" ]; then |
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die "Failed to mount block device of live image" |
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exit 1 |
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fi |
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# overlay setup helper function |
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do_live_overlay() { |
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# create a sparse file for the overlay |
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# overlay: if non-ram overlay searching is desired, do it, |
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# otherwise, create traditional overlay in ram |
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OVERLAY_LOOPDEV=$( losetup -f ) |
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l=$(blkid -s LABEL -o value $livedev) || l="" |
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u=$(blkid -s UUID -o value $livedev) || u="" |
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if [ -z "$overlay" ]; then |
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pathspec="/${live_dir}/overlay-$l-$u" |
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elif ( echo $overlay | grep -q ":" ); then |
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# pathspec specified, extract |
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pathspec=$( echo $overlay | sed -e 's/^.*://' ) |
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fi |
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if [ -z "$pathspec" -o "$pathspec" = "auto" ]; then |
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pathspec="/${live_dir}/overlay-$l-$u" |
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fi |
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devspec=$( echo $overlay | sed -e 's/:.*$//' ) |
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# need to know where to look for the overlay |
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setup="" |
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if [ -n "$devspec" -a -n "$pathspec" -a -n "$overlay" ]; then |
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mkdir /overlayfs |
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mount -n -t auto $devspec /overlayfs || : |
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if [ -f /overlayfs$pathspec -a -w /overlayfs$pathspec ]; then |
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losetup $OVERLAY_LOOPDEV /overlayfs$pathspec |
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if [ -n "$reset_overlay" ]; then |
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dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 2>/dev/null |
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fi |
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setup="yes" |
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fi |
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umount -l /overlayfs || : |
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fi |
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if [ -z "$setup" ]; then |
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if [ -n "$devspec" -a -n "$pathspec" ]; then |
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warn "Unable to find persistent overlay; using temporary" |
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sleep 5 |
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fi |
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dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((512*1024)) 2> /dev/null |
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losetup $OVERLAY_LOOPDEV /overlay |
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fi |
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# set up the snapshot |
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echo 0 `blockdev --getsz $BASE_LOOPDEV` snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV p 8 | dmsetup create $readonly_overlay live-rw |
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} |
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# live cd helper function |
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do_live_from_base_loop() { |
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do_live_overlay |
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} |
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# we might have a genMinInstDelta delta file for anaconda to take advantage of |
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if [ -e /dev/.initramfs/live/${live_dir}/osmin.img ]; then |
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OSMINSQFS=/dev/.initramfs/live/${live_dir}/osmin.img |
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fi |
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if [ -n "$OSMINSQFS" ]; then |
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# decompress the delta data |
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dd if=$OSMINSQFS of=/osmin.img 2> /dev/null |
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OSMIN_SQUASHED_LOOPDEV=$( losetup -f ) |
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losetup -r $OSMIN_SQUASHED_LOOPDEV /osmin.img |
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mkdir -p /squashfs.osmin |
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mount -n -t squashfs -o ro $OSMIN_SQUASHED_LOOPDEV /squashfs.osmin |
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OSMIN_LOOPDEV=$( losetup -f ) |
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losetup -r $OSMIN_LOOPDEV /squashfs.osmin/osmin |
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umount -l /squashfs.osmin |
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fi |
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# we might have just an embedded ext3 to use as rootfs (uncompressed live) |
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if [ -e /dev/.initramfs/live/${live_dir}/ext3fs.img ]; then |
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EXT3FS="/dev/.initramfs/live/${live_dir}/ext3fs.img" |
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fi |
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if [ -n "$EXT3FS" ] ; then |
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BASE_LOOPDEV=$( losetup -f ) |
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losetup -r $BASE_LOOPDEV $EXT3FS |
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do_live_from_base_loop |
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fi |
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# we might have an embedded ext3 on squashfs to use as rootfs (compressed live) |
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if [ -e /dev/.initramfs/live/${live_dir}/squashfs.img ]; then |
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SQUASHED="/dev/.initramfs/live/${live_dir}/squashfs.img" |
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fi |
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if [ -e "$SQUASHED" ] ; then |
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if [ -n "$live_ram" ] ; then |
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echo "Copying live image to RAM..." |
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echo "(this may take a few minutes)" |
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dd if=$SQUASHED of=/squashed.img bs=512 2> /dev/null |
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umount -n /dev/.initramfs/live |
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echo "Done copying live image to RAM." |
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eject -p $livedev || : |
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SQUASHED="/squashed.img" |
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fi |
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SQUASHED_LOOPDEV=$( losetup -f ) |
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losetup -r $SQUASHED_LOOPDEV $SQUASHED |
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mkdir -p /squashfs |
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mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /squashfs |
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BASE_LOOPDEV=$( losetup -f ) |
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losetup -r $BASE_LOOPDEV /squashfs/LiveOS/ext3fs.img |
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umount -l /squashfs |
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do_live_from_base_loop |
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fi |
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if [ -b "$OSMIN_LOOPDEV" ]; then |
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# set up the devicemapper snapshot device, which will merge |
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# the normal live fs image, and the delta, into a minimzied fs image |
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echo "0 $( blockdev --getsz $BASE_LOOPDEV ) snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV p 8" | dmsetup create --readonly live-osimg-min |
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fi |
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ROOTFLAGS="$(getarg rootflags)" |
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if [ -n "$ROOTFLAGS" ]; then |
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ROOTFLAGS="-o $ROOTFLAGS" |
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fi |
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ln -s /dev/mapper/live-rw /dev/root |
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printf '/bin/mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > /mount/01-$$-live.sh |
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exit 0
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