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