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#!/bin/sh # -- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -- # ex: ts=8 sw=4 sts=4 et filetype=sh type getarg >/dev/null 2>&1 \|\| . /lib/dracut-lib.sh command -v unpack_archive >/dev/null \|\| . /lib/img-lib.sh PATH=/usr/sbin:/usr/bin:/sbin:/bin if getargbool 0 rd.live.debug -n -y 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 rd.live.dir -d live_dir) [ -z "$live_dir" ] && live_dir="LiveOS" squash_image=$(getarg rd.live.squashimg) [ -z "$squash_image" ] && squash_image="squashfs.img" getargbool 0 rd.live.ram -d -y live_ram && live_ram="yes" getargbool 0 rd.live.overlay.reset -d -y reset_overlay && reset_overlay="yes" getargbool 0 rd.live.overlay.readonly -d -y readonly_overlay && readonly_overlay="--readonly" \|\| readonly_overlay="" overlay=$(getarg rd.live.overlay -d overlay) getargbool 0 rd.writable.fsimg -d -y writable_fsimg && writable_fsimg="yes" overlay_size=$(getarg rd.live.overlay.size=) [ -z "$overlay_size" ] && overlay_size=512 getargbool 0 rd.live.overlay.thin && thin_snapshot="yes" # CD/DVD media check [ -b $livedev ] && fs=$(blkid -s TYPE -o value $livedev) if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then check="yes" fi getarg rd.live.check -d check \|\| check="" if [ -n "$check" ]; then type plymouth >/dev/null 2>&1 && plymouth --hide-splash if [ -n "$DRACUT_SYSTEMD" ]; then p=$(str_replace "$livedev" "-" '\x2d') systemctl start checkisomd5@${p}.service else checkisomd5 --verbose $livedev fi if [ $? -eq 1 ]; then die "CD check failed!" exit 1 fi type plymouth >/dev/null 2>&1 && plymouth --show-splash fi ln -s $livedev /run/initramfs/livedev # determine filesystem type for a filesystem image det_img_fs() { udevadm settle blkid -s TYPE -u noraid -o value "$1" } modprobe squashfs CMDLINE=$(getcmdline) for arg in $CMDLINE; do case $arg in ro\|rw) liverw=$arg ;; esac; done # mount the backing of the live image first mkdir -m 0755 -p /run/initramfs/live if [ -f $livedev ]; then # no mount needed - we've already got the LiveOS image in initramfs # check filesystem type and handle accordingly fstype=$(det_img_fs $livedev) case $fstype in squashfs) SQUASHED=$livedev;; auto) die "cannot mount live image (unknown filesystem type)" ;; ) FSIMG=$livedev ;; esac [ -e /sys/fs/$fstype ] \|\| modprobe $fstype else if [ "$(blkid -o value -s TYPE $livedev)" != "ntfs" ]; then mount -n -t $fstype -o ${liverw:-ro} $livedev /run/initramfs/live else # Symlinking /usr/bin/ntfs-3g as /sbin/mount.ntfs seems to boot # at the first glance, but ends with lots and lots of squashfs # errors, because systemd attempts to kill the ntfs-3g process?! if [ -x "/usr/bin/ntfs-3g" ]; then ( exec -a @ntfs-3g ntfs-3g -o ${liverw:-ro} $livedev /run/initramfs/live ) \| vwarn else die "Failed to mount block device of live image: Missing NTFS support" exit 1 fi fi if [ "$?" != "0" ]; then die "Failed to mount block device of live image" exit 1 fi 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 -m 0755 /run/initramfs/overlayfs mount -n -t auto $devspec /run/initramfs/overlayfs \|\| : if [ -f /run/initramfs/overlayfs$pathspec -a -w /run/initramfs/overlayfs$pathspec ]; then losetup $OVERLAY_LOOPDEV /run/initramfs/overlayfs$pathspec if [ -n "$reset_overlay" ]; then dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 conv=fsync 2>/dev/null fi setup="yes" fi umount -l /run/initramfs/overlayfs \|\| : fi if [ -z "$setup" -o -n "$readonly_overlay" ]; then if [ -n "$setup" ]; then warn "Using temporary overlay." elif [ -n "$devspec" -a -n "$pathspec" ]; then warn "Unable to find persistent overlay; using temporary" sleep 5 fi dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((overlay_size1024)) 2> /dev/null if [ -n "$setup" -a -n "$readonly_overlay" ]; then RO_OVERLAY_LOOPDEV=$( losetup -f ) losetup $RO_OVERLAY_LOOPDEV /overlay else losetup $OVERLAY_LOOPDEV /overlay fi fi # set up the snapshot sz=$(blockdev --getsz $BASE_LOOPDEV) if [ -n "$readonly_overlay" ]; then echo 0 $sz snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV p 8 \| dmsetup create $readonly_overlay live-ro base="/dev/mapper/live-ro" over=$RO_OVERLAY_LOOPDEV else base=$BASE_LOOPDEV over=$OVERLAY_LOOPDEV fi if [ -n "$thin_snapshot" ]; then modprobe dm_thin_pool mkdir /run/initramfs/thin-overlay # In block units (512b) thin_data_sz=$(( $overlay_size * 1024 * 1024 / 512 )) thin_meta_sz=$(( $thin_data_sz / 10 )) # It is important to have the backing file on a tmpfs # this is needed to let the loopdevice support TRIM dd if=/dev/null of=/run/initramfs/thin-overlay/meta bs=1b count=1 seek=$((thin_meta_sz)) 2> /dev/null dd if=/dev/null of=/run/initramfs/thin-overlay/data bs=1b count=1 seek=$((thin_data_sz)) 2> /dev/null THIN_META_LOOPDEV=$( losetup --show -f /run/initramfs/thin-overlay/meta ) THIN_DATA_LOOPDEV=$( losetup --show -f /run/initramfs/thin-overlay/data ) echo 0 $thin_data_sz thin-pool $THIN_META_LOOPDEV $THIN_DATA_LOOPDEV 1024 1024 \| dmsetup create live-overlay-pool dmsetup message /dev/mapper/live-overlay-pool 0 "create_thin 0" # Create a snapshot of the base image echo 0 $sz thin /dev/mapper/live-overlay-pool 0 $base \| dmsetup create live-rw else echo 0 $sz snapshot $base $over p 8 \| dmsetup create live-rw fi # Create a device that always points to a ro base image echo 0 $sz linear $base 0 \| dmsetup create --readonly live-base } # live cd helper function do_live_from_base_loop() { do_live_overlay } # we might have a genMinInstDelta delta file for anaconda to take advantage of if [ -e /run/initramfs/live/${live_dir}/osmin.img ]; then OSMINSQFS=/run/initramfs/live/${live_dir}/osmin.img fi if [ -n "$OSMINSQFS" ]; then # decompress the delta data dd if=$OSMINSQFS of=/run/initramfs/osmin.img 2> /dev/null OSMIN_SQUASHED_LOOPDEV=$( losetup -f ) losetup -r $OSMIN_SQUASHED_LOOPDEV /run/initramfs/osmin.img mkdir -m 0755 -p /run/initramfs/squashfs.osmin mount -n -t squashfs -o ro $OSMIN_SQUASHED_LOOPDEV /run/initramfs/squashfs.osmin OSMIN_LOOPDEV=$( losetup -f ) losetup -r $OSMIN_LOOPDEV /run/initramfs/squashfs.osmin/osmin umount -l /run/initramfs/squashfs.osmin fi # we might have an embedded fs image on squashfs (compressed live) if [ -e /run/initramfs/live/${live_dir}/${squash_image} ]; then SQUASHED="/run/initramfs/live/${live_dir}/${squash_image}" fi if [ -e "$SQUASHED" ] ; then if [ -n "$live_ram" ] ; then echo "Copying live image to RAM..." echo "(this may take a few minutes)" dd if=$SQUASHED of=/run/initramfs/squashed.img bs=512 2> /dev/null umount -n /run/initramfs/live echo "Done copying live image to RAM." SQUASHED="/run/initramfs/squashed.img" fi SQUASHED_LOOPDEV=$( losetup -f ) losetup -r $SQUASHED_LOOPDEV $SQUASHED mkdir -m 0755 -p /run/initramfs/squashfs mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /run/initramfs/squashfs fi # we might have an embedded fs image to use as rootfs (uncompressed live) if [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img" elif [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then FSIMG="/run/initramfs/live/${live_dir}/rootfs.img" elif [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img" elif [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img" fi if [ -n "$FSIMG" ] ; then BASE_LOOPDEV=$( losetup -f ) if [ -n "$writable_fsimg" ] ; then # mount the provided fileysstem read/write echo "Unpacking live filesystem (may take some time)" mkdir /run/initramfs/fsimg/ if [ -n "$SQUASHED" ]; then cp -v $FSIMG /run/initramfs/fsimg/rootfs.img else unpack_archive $FSIMG /run/initramfs/fsimg/ fi losetup $BASE_LOOPDEV /run/initramfs/fsimg/rootfs.img echo "0 $( blockdev --getsize $BASE_LOOPDEV ) linear $BASE_LOOPDEV 0" \| dmsetup create live-rw else # mount the filesystem read-only and add a dm snapshot for writes losetup -r $BASE_LOOPDEV $FSIMG do_live_from_base_loop fi fi [ -e "$SQUASHED" ] && umount -l /run/initramfs/squashfs 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 $ROOTFLAGS" fi ln -s /dev/mapper/live-rw /dev/root printf 'mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > $hookdir/mount/01-$$-live.sh need_shutdown exit 0

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