name : dmsquash-live-root.sh #!/bin/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=32768 getargbool 0 rd.live.overlay.thin && thin_snapshot="yes" getargbool 0 rd.live.overlay.overlayfs && overlayfs="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 "$DRACUT_SYSTEMD" ]; then p=$(dev_unit_name "$livedev") systemctl start checkisomd5@${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 >&2 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 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 strstr $overlay ":"; then # pathspec specified, extract pathspec=${overlay##*:} fi if [ -z "$pathspec" -o "$pathspec" = "auto" ]; then pathspec="/${live_dir}/overlay-$l-$u" fi devspec=${overlay%%:*} # need to know where to look for the overlay if [ -z "$setup" -a -n "$devspec" -a -n "$pathspec" -a -n "$overlay" ]; then mkdir -m 0755 /run/initramfs/overlayfs opt='' [ -n "$readonly_overlay" ] && opt=-r mount -n -t auto $devspec /run/initramfs/overlayfs || : if [ -f /run/initramfs/overlayfs$pathspec -a -w /run/initramfs/overlayfs$pathspec ]; then OVERLAY_LOOPDEV=$(losetup -f --show $opt /run/initramfs/overlayfs$pathspec) over=$OVERLAY_LOOPDEV umount -l /run/initramfs/overlayfs || : oltype=$(det_img_fs $OVERLAY_LOOPDEV) if [ -z "$oltype" ] || [ "$oltype" = DM_snapshot_cow ]; then if [ -n "$reset_overlay" ]; then info "Resetting the Device-mapper overlay." dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 conv=fsync 2>/dev/null fi if [ -n "$overlayfs" ]; then unset -v overlayfs [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit=":>/xor_overlayfs;" fi setup="yes" else mount -n -t $oltype $opt $OVERLAY_LOOPDEV /run/initramfs/overlayfs if [ -d /run/initramfs/overlayfs/overlayfs ] && [ -d /run/initramfs/overlayfs/ovlwork ]; then ln -s /run/initramfs/overlayfs/overlayfs /run/overlayfs$opt ln -s /run/initramfs/overlayfs/ovlwork /run/ovlwork$opt if [ -z "$overlayfs" ] && [ -n "$DRACUT_SYSTEMD" ]; then reloadsysrootmountunit=":>/xor_overlayfs;" fi overlayfs="required" setup="yes" fi fi elif [ -d /run/initramfs/overlayfs$pathspec ] && [ -d /run/initramfs/overlayfs$pathspec/../ovlwork ]; then ln -s /run/initramfs/overlayfs$pathspec /run/overlayfs$opt ln -s /run/initramfs/overlayfs$pathspec/../ovlwork /run/ovlwork$opt if [ -z "$overlayfs" ] && [ -n "$DRACUT_SYSTEMD" ]; then reloadsysrootmountunit=":>/xor_overlayfs;" fi overlayfs="required" setup="yes" fi fi if [ -n "$overlayfs" ]; then modprobe overlay if [ $? != 0 ]; then if [ "$overlayfs" = required ]; then die "OverlayFS is required but not available." exit 1 fi [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit=":>/xor_overlayfs;" m='OverlayFS is not available; using temporary Device-mapper overlay.' info $m unset -v overlayfs setup fi fi if [ -z "$setup" -o -n "$readonly_overlay" ]; then if [ -n "$setup" ]; then warn "Using temporary overlay." elif [ -n "$devspec" -a -n "$pathspec" ]; then [ -z "$m" ] && m=' Unable to find a persistent overlay; using a temporary one.' m="$m"$'\n All root filesystem changes will be lost on shutdown.' m="$m"$'\n Press [Enter] to continue.' printf "\n\n\n\n${m}\n\n\n" > /dev/kmsg if [ -n "$DRACUT_SYSTEMD" ]; then if type plymouth >/dev/null 2>&1 && plymouth --ping ; then if getargbool 0 rhgb || getargbool 0 splash ; then m='>>>'$'\n''>>>'$'\n''>>>'$'\n\n\n'"$m" m="${m%n.*}"$'n.\n\n\n''<<<'$'\n''<<<'$'\n''<<<' plymouth display-message --text="${m}" else plymouth ask-question --prompt="${m}" --command=true fi else m=">>>${m//.[[:space:]]/.} <<<" systemd-ask-password --timeout=0 "${m}" fi else type plymouth >/dev/null 2>&1 && plymouth --ping && plymouth --quit read -s -r -p $'\n\n'"${m}" -n 1 reply fi fi if [ -n "$overlayfs" ]; then mkdir -m 0755 /run/overlayfs mkdir -m 0755 /run/ovlwork if [ -n "$readonly_overlay" ] && ! [ -h /run/overlayfs-r ]; then info "No persistent overlay found." unset -v readonly_overlay [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit="${reloadsysrootmountunit}:>/xor_readonly;" fi else dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((overlay_size*1024)) 2> /dev/null if [ -n "$setup" -a -n "$readonly_overlay" ]; then RO_OVERLAY_LOOPDEV=$(losetup -f --show /overlay) over=$RO_OVERLAY_LOOPDEV else OVERLAY_LOOPDEV=$(losetup -f --show /overlay) over=$OVERLAY_LOOPDEV fi fi fi # set up the snapshot if [ -z "$overlayfs" ]; then if [ -n "$readonly_overlay" ] && [ -n "$OVERLAY_LOOPDEV" ]; then echo 0 $sz snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV P 8 | dmsetup create --readonly live-ro base="/dev/mapper/live-ro" else base=$BASE_LOOPDEV fi fi if [ -n "$thin_snapshot" ]; then modprobe dm_thin_pool mkdir -m 0755 /run/initramfs/thin-overlay # In block units (512b) thin_data_sz=$(( $overlay_size * 1024 * 1024 / 512 )) thin_meta_sz=$(( $thin_data_sz / 10 )) # It is important to have the backing file on a tmpfs # this is needed to let the loopdevice support TRIM dd if=/dev/null of=/run/initramfs/thin-overlay/meta bs=1b count=1 seek=$((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 $base | dmsetup create live-rw elif [ -z "$overlayfs" ]; then echo 0 $sz snapshot $base $over PO 8 | dmsetup create live-rw fi # Create a device for the ro base of overlayed file systems. if [ -z "$overlayfs" ]; then echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create --readonly live-base fi ln -s $BASE_LOOPDEV /dev/live-base } # end do_live_overlay() # we might have a genMinInstDelta delta file for anaconda to take advantage of if [ -e /run/initramfs/live/${live_dir}/osmin.img ]; then OSMINSQFS=/run/initramfs/live/${live_dir}/osmin.img # decompress the delta data dd if=$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 "$live_ram" ]; then echo 'Copying live image to RAM...' > /dev/kmsg echo ' (this may take a minute)' > /dev/kmsg dd if=$SQUASHED of=/run/initramfs/squashed.img bs=512 2> /dev/null echo 'Done copying live image to RAM.' > /dev/kmsg 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 $SQUASHED_LOOPDEV /run/initramfs/squashfs if [ -d /run/initramfs/squashfs/LiveOS ]; then if [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img" elif [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img" fi elif [ -d /run/initramfs/squashfs/proc ]; then FSIMG=$SQUASHED if [ -z "$overlayfs" ] && [ -n "$DRACUT_SYSTEMD" ]; then reloadsysrootmountunit=":>/xor_overlayfs;" fi overlayfs="required" else die "Failed to find a root filesystem in $SQUASHED." exit 1 fi else # we might have an embedded fs image to use as rootfs (uncompressed live) if [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then FSIMG="/run/initramfs/live/${live_dir}/rootfs.img" elif [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img" fi if [ -n "$live_ram" ]; then echo 'Copying live image to RAM...' > /dev/kmsg echo ' (this may take a minute or so)' > /dev/kmsg dd if=$FSIMG of=/run/initramfs/rootfs.img bs=512 2> /dev/null echo 'Done copying live image to RAM.' > /dev/kmsg FSIMG='/run/initramfs/rootfs.img' fi fi if [ -n "$FSIMG" ]; then if [ -n "$writable_fsimg" ]; then # mount the provided filesystem read/write echo "Unpacking live filesystem (may take some time)" > /dev/kmsg mkdir -m 0755 /run/initramfs/fsimg/ if [ -n "$SQUASHED" ]; then cp -v $FSIMG /run/initramfs/fsimg/rootfs.img else unpack_archive $FSIMG /run/initramfs/fsimg/ fi FSIMG=/run/initramfs/fsimg/rootfs.img fi opt=-r # For writable DM images... if [ -z "$SQUASHED" -a -n "$live_ram" -a -z "$overlayfs" ] || [ -n "$writable_fsimg" ] || [ "$overlay" = none -o "$overlay" = None -o "$overlay" = NONE ]; then if [ -z "$readonly_overlay" ]; then opt='' setup=rw else setup=yes fi fi if [ "$FSIMG" = "$SQUASHED" ]; then BASE_LOOPDEV=$SQUASHED_LOOPDEV else BASE_LOOPDEV=$(losetup -f --show $opt $FSIMG) sz=$(blockdev --getsz $BASE_LOOPDEV) fi if [ "$setup" = rw ]; then echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create live-rw else # Add a DM snapshot or OverlayFS for writes. do_live_overlay fi fi if [ -b "$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 $sz snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV P 8" | dmsetup create --readonly live-osimg-min fi if [ -n "$reloadsysrootmountunit" ]; then eval "$reloadsysrootmountunit" systemctl daemon-reload fi ROOTFLAGS="$(getarg rootflags)" if [ -n "$overlayfs" ]; then mkdir -m 0755 /run/rootfsbase if [ -n "$reset_overlay" ] && [ -h /run/overlayfs ]; then ovlfs=$(readlink /run/overlayfs) info "Resetting the OverlayFS overlay directory." rm -r -- ${ovlfs}/* ${ovlfs}/.* >/dev/null 2>&1 fi if [ -n "$readonly_overlay" ] && [ -h /run/overlayfs-r ]; then ovlfs=lowerdir=/run/overlayfs-r:/run/rootfsbase else ovlfs=lowerdir=/run/rootfsbase fi mount -r $FSIMG /run/rootfsbase if [ -z "$DRACUT_SYSTEMD" ]; then printf 'mount -t overlay LiveOS_rootfs -o%s,%s %s\n' "$ROOTFLAGS" \ "$ovlfs",upperdir=/run/overlayfs,workdir=/run/ovlwork \ "$NEWROOT" > $hookdir/mount/01-$$-live.sh fi else if [ -z "$DRACUT_SYSTEMD" ]; then [ -n "$ROOTFLAGS" ] && ROOTFLAGS="-o $ROOTFLAGS" printf 'mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > $hookdir/mount/01-$$-live.sh fi fi [ -e "$SQUASHED" ] && umount -l /run/initramfs/squashfs ln -s null /dev/root need_shutdown exit 0