298 lines
10 KiB
Bash
Executable file
298 lines
10 KiB
Bash
Executable file
#!/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:/usr/local/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 $OVERLAY_LOOPDEV N 8 | dmsetup create --readonly live-ro
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base="/dev/mapper/live-ro"
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over=$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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#emergency_shell
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loadkeys trq
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ln -s /usr/sbin/dmsetup /sbin/
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modprobe dm_mod
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modprobe dm_multipath
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echo "ornek:echo 0 7273437 snapshot /dev/loop1 /dev/loop2 PO 8"
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echo 0 $sz snapshot $base $over PO 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 $BASE_LOOPDEV 0 | dmsetup create --readonly live-base &
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ln -s /dev/dm-0 /dev/mapper/live-base
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ln -s /dev/dm-1 /dev/mapper/live-rw
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#emergency_shell
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}
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# live cd helper function
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do_live_from_base_loop() {
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do_live_overlay
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}
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# we might have a genMinInstDelta delta file for anaconda to take advantage of
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if [ -e /run/initramfs/live/${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}/${squash_image}"
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if [ -n "$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=$SQUASHED of=/run/initramfs/squashed.img bs=512 2> /dev/null
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echo "Done copying live image to RAM."
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SQUASHED="/run/initramfs/squashed.img"
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fi
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SQUASHED_LOOPDEV=$( 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 $SQUASHED_LOOPDEV /run/initramfs/squashfs
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if [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then
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FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img"
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elif [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then
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FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img"
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fi
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else
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# we might have an embedded fs image to use as rootfs (uncompressed live)
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if [ -e /run/initramfs/live/${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/${live_dir}/rootfs.img"
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fi
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if [ -n "$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=$FSIMG of=/run/initramfs/rootfs.img bs=512 2> /dev/null
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echo 'Done copying live image to RAM.'
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FSIMG='/run/initramfs/rootfs.img'
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fi
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fi
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if [ -n "$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 filesystem 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 $FSIMG /run/initramfs/fsimg/
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fi
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FSIMG=/run/initramfs/fsimg/rootfs.img
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fi
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if [ -n "$writable_fsimg" ] || [ -z "$SQUASHED" -a -n "$live_ram" ] ||
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[ "$overlay" = none -o "$overlay" = None -o "$overlay" = NONE ]; then
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losetup $BASE_LOOPDEV $FSIMG
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sz=$(blockdev --getsz $BASE_LOOPDEV)
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echo 0 $sz 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 $OSMIN_LOOPDEV N 8" | dmsetup create --readonly live-osimg-min
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fi
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ROOTFLAGS="$(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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