modules.d/90dmsquash-live/dmsquash-live-root.sh

   1 #!/bin/sh
   2
   3 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   4
   5 command -v unpack_archive >/dev/null || . /lib/img-lib.sh
   6
   7 PATH=/usr/sbin:/usr/bin:/sbin:/bin
   8
   9 if getargbool 0 rd.live.debug -n -y rdlivedebug; then
  10     exec > /tmp/liveroot.$$.out
  11     exec 2>> /tmp/liveroot.$$.out
  12     set -x
  13 fi
  14
  15 [ -z "$1" ] && exit 1
  16 livedev="$1"
  17
  18 # parse various live image specific options that make sense to be
  19 # specified as their own things
  20 live_dir=$(getarg rd.live.dir -d live_dir)
  21 [ -z "$live_dir" ] && live_dir="LiveOS"
  22 squash_image=$(getarg rd.live.squashimg)
  23 [ -z "$squash_image" ] && squash_image="squashfs.img"
  24
  25 getargbool 0 rd.live.ram -d -y live_ram && live_ram="yes"
  26 getargbool 0 rd.live.overlay.reset -d -y reset_overlay && reset_overlay="yes"
  27 getargbool 0 rd.live.overlay.readonly -d -y readonly_overlay && readonly_overlay="--readonly" || readonly_overlay=""
  28 overlay=$(getarg rd.live.overlay -d overlay)
  29 getargbool 0 rd.writable.fsimg -d -y writable_fsimg && writable_fsimg="yes"
  30 overlay_size=$(getarg rd.live.overlay.size=)
  31 [ -z "$overlay_size" ] && overlay_size=32768
  32
  33 getargbool 0 rd.live.overlay.thin && thin_snapshot="yes"
  34 getargbool 0 rd.live.overlay.overlayfs && overlayfs="yes"
  35
  36 # CD/DVD media check
  37 [ -b $livedev ] && fs=$(blkid -s TYPE -o value $livedev)
  38 if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then
  39     check="yes"
  40 fi
  41 getarg rd.live.check -d check || check=""
  42 if [ -n "$check" ]; then
  43     type plymouth >/dev/null 2>&1 && plymouth --hide-splash
  44     if [ -n "$DRACUT_SYSTEMD" ]; then
  45         p=$(dev_unit_name "$livedev")
  46         systemctl start checkisomd5@${p}.service
  47     else
  48         checkisomd5 --verbose $livedev
  49     fi
  50     if [ $? -eq 1 ]; then
  51         die "CD check failed!"
  52         exit 1
  53     fi
  54     type plymouth >/dev/null 2>&1 && plymouth --show-splash
  55 fi
  56
  57 ln -s $livedev /run/initramfs/livedev
  58
  59 # determine filesystem type for a filesystem image
  60 det_img_fs() {
  61     udevadm settle >&2
  62     blkid -s TYPE -u noraid -o value "$1"
  63 }
  64
  65 modprobe squashfs
  66 CMDLINE=$(getcmdline)
  67 for arg in $CMDLINE; do case $arg in ro|rw) liverw=$arg ;; esac; done
  68 # mount the backing of the live image first
  69 mkdir -m 0755 -p /run/initramfs/live
  70 if [ -f $livedev ]; then
  71     # no mount needed - we've already got the LiveOS image in initramfs
  72     # check filesystem type and handle accordingly
  73     fstype=$(det_img_fs $livedev)
  74     case $fstype in
  75         squashfs) SQUASHED=$livedev;;
  76         auto) die "cannot mount live image (unknown filesystem type)" ;;
  77         *) FSIMG=$livedev ;;
  78     esac
  79     [ -e /sys/fs/$fstype ] || modprobe $fstype
  80 else
  81     if [ "$(blkid -o value -s TYPE $livedev)" != "ntfs" ]; then
  82         mount -n -t $fstype -o ${liverw:-ro} $livedev /run/initramfs/live
  83     else
  84         # Symlinking /usr/bin/ntfs-3g as /sbin/mount.ntfs seems to boot
  85         # at the first glance, but ends with lots and lots of squashfs
  86         # errors, because systemd attempts to kill the ntfs-3g process?!
  87         if [ -x "/usr/bin/ntfs-3g" ]; then
  88             ( exec -a @ntfs-3g ntfs-3g -o ${liverw:-ro} $livedev /run/initramfs/live ) | vwarn
  89         else
  90             die "Failed to mount block device of live image: Missing NTFS support"
  91             exit 1
  92         fi
  93     fi
  94
  95     if [ "$?" != "0" ]; then
  96         die "Failed to mount block device of live image"
  97         exit 1
  98     fi
  99 fi
 100
 101 # overlay setup helper function
 102 do_live_overlay() {
 103     # create a sparse file for the overlay
 104     # overlay: if non-ram overlay searching is desired, do it,
 105     #              otherwise, create traditional overlay in ram
 106
 107     l=$(blkid -s LABEL -o value $livedev) || l=""
 108     u=$(blkid -s UUID -o value $livedev) || u=""
 109
 110     if [ -z "$overlay" ]; then
 111         pathspec="/${live_dir}/overlay-$l-$u"
 112     elif ( echo $overlay | grep -q ":" ); then
 113         # pathspec specified, extract
 114         pathspec=$( echo $overlay | sed -e 's/^.*://' )
 115     fi
 116
 117     if [ -z "$pathspec" -o "$pathspec" = "auto" ]; then
 118         pathspec="/${live_dir}/overlay-$l-$u"
 119     fi
 120     devspec=$( echo $overlay | sed -e 's/:.*$//' )
 121
 122     # need to know where to look for the overlay
 123     if [ -z "$setup" -a -n "$devspec" -a -n "$pathspec" -a -n "$overlay" ]; then
 124         mkdir -m 0755 /run/initramfs/overlayfs
 125         opt=''
 126         [ -n "$readonly_overlay" ] && opt=-r
 127         mount -n -t auto $devspec /run/initramfs/overlayfs || :
 128         if [ -f /run/initramfs/overlayfs$pathspec -a -w /run/initramfs/overlayfs$pathspec ]; then
 129             OVERLAY_LOOPDEV=$(losetup -f --show $opt /run/initramfs/overlayfs$pathspec)
 130             over=$OVERLAY_LOOPDEV
 131             umount -l /run/initramfs/overlayfs || :
 132             oltype=$(det_img_fs $OVERLAY_LOOPDEV)
 133             if [ -z "$oltype" ] || [ "$oltype" = DM_snapshot_cow ]; then
 134                 if [ -n "$reset_overlay" ]; then
 135                     info "Resetting the Device-mapper overlay."
 136                     dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 conv=fsync 2>/dev/null
 137                 fi
 138                 if [ -n "$overlayfs" ]; then
 139                     unset -v overlayfs
 140                     [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit="yes"
 141                 fi
 142                 setup="yes"
 143             else
 144                 mount -n -t $oltype $opt $OVERLAY_LOOPDEV /run/initramfs/overlayfs
 145                 if [ -d /run/initramfs/overlayfs/overlayfs ] &&
 146                     [ -d /run/initramfs/overlayfs/ovlwork ]; then
 147                     ln -s /run/initramfs/overlayfs/overlayfs /run/overlayfs$opt
 148                     ln -s /run/initramfs/overlayfs/ovlwork /run/ovlwork$opt
 149                     if [ -z "$overlayfs" ]; then
 150                         overlayfs="yes"
 151                         [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit="yes"
 152                     fi
 153                     setup="yes"
 154                 fi
 155             fi
 156         elif [ -d /run/initramfs/overlayfs$pathspec ] &&
 157             [ -d /run/initramfs/overlayfs$pathspec/../ovlwork ]; then
 158             ln -s /run/initramfs/overlayfs$pathspec /run/overlayfs$opt
 159             ln -s /run/initramfs/overlayfs$pathspec/../ovlwork /run/ovlwork$opt
 160             if [ -z "$overlayfs" ]; then
 161                 overlayfs="yes"
 162                 [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit="yes"
 163             fi
 164             setup="yes"
 165         fi
 166     fi
 167     if [ -n "$overlayfs" ]; then
 168         modprobe overlay
 169         if [ $? != 0 ]; then
 170             m='OverlayFS is not available; using temporary Device-mapper overlay.'
 171             unset -v overlayfs setup
 172             [ -n "$reloadsysrootmountunit" ] && unset -v reloadsysrootmountunit
 173         fi
 174     fi
 175
 176     if [ -z "$setup" -o -n "$readonly_overlay" ]; then
 177         if [ -n "$setup" ]; then
 178             warn "Using temporary overlay."
 179         elif [ -n "$devspec" -a -n "$pathspec" ]; then
 180             [ -z "$m" ] &&
 181                 m='   Unable to find a persistent overlay; using a temporary one.'
 182             m="$m"$'\n      All root filesystem changes will be lost on shutdown.'
 183             m="$m"$'\n         Press [Enter] to continue.'
 184             echo -e "\n\n\n\n${m}\n\n\n" > /dev/kmsg
 185             if [ -n "$DRACUT_SYSTEMD" ]; then
 186                 if type plymouth >/dev/null 2>&1 && plymouth --ping ; then
 187                     if getargbool 0 rhgb || getargbool 0 splash ; then
 188                         m='>>>'$'\n''>>>'$'\n''>>>'$'\n\n\n'"$m"
 189                         m="${m%n.*}"$'n.\n\n\n''<<<'$'\n''<<<'$'\n''<<<'
 190                         plymouth display-message --text="${m}"
 191                     else
 192                         plymouth ask-question --prompt="${m}" --command=true
 193                     fi
 194                 else
 195                     m=">>>${m//.[[:space:]]/.}  <<<"
 196                     systemd-ask-password --timeout=0 "${m}"
 197                 fi
 198             else
 199                 type plymouth >/dev/null 2>&1 && plymouth --ping && plymouth --quit
 200                 read -s -r -p $'\n\n'"${m}" -n 1 reply
 201             fi
 202         fi
 203         if [ -n "$overlayfs" ]; then
 204             mkdir -m 0755 /run/overlayfs
 205             mkdir -m 0755 /run/ovlwork
 206         else
 207             dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((overlay_size*1024)) 2> /dev/null
 208             if [ -n "$setup" -a -n "$readonly_overlay" ]; then
 209                 RO_OVERLAY_LOOPDEV=$(losetup -f --show /overlay)
 210                 over=$RO_OVERLAY_LOOPDEV
 211             else
 212                 OVERLAY_LOOPDEV=$(losetup -f --show /overlay)
 213                 over=$OVERLAY_LOOPDEV
 214             fi
 215         fi
 216     fi
 217
 218     # set up the snapshot
 219     if [ -z "$overlayfs" ]; then
 220         if [ -n "$readonly_overlay" ] && [ -n "$OVERLAY_LOOPDEV" ]; then
 221             echo 0 $sz snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV P 8 | dmsetup create --readonly live-ro
 222             base="/dev/mapper/live-ro"
 223         else
 224             base=$BASE_LOOPDEV
 225         fi
 226     fi
 227
 228     if [ -n "$thin_snapshot" ]; then
 229         modprobe dm_thin_pool
 230         mkdir -m 0755 /run/initramfs/thin-overlay
 231
 232         # In block units (512b)
 233         thin_data_sz=$(( $overlay_size * 1024 * 1024 / 512 ))
 234         thin_meta_sz=$(( $thin_data_sz / 10 ))
 235
 236         # It is important to have the backing file on a tmpfs
 237         # this is needed to let the loopdevice support TRIM
 238         dd if=/dev/null of=/run/initramfs/thin-overlay/meta bs=1b count=1 seek=$((thin_meta_sz)) 2> /dev/null
 239         dd if=/dev/null of=/run/initramfs/thin-overlay/data bs=1b count=1 seek=$((thin_data_sz)) 2> /dev/null
 240
 241         THIN_META_LOOPDEV=$( losetup --show -f /run/initramfs/thin-overlay/meta )
 242         THIN_DATA_LOOPDEV=$( losetup --show -f /run/initramfs/thin-overlay/data )
 243
 244         echo 0 $thin_data_sz thin-pool $THIN_META_LOOPDEV $THIN_DATA_LOOPDEV 1024 1024 | dmsetup create live-overlay-pool
 245         dmsetup message /dev/mapper/live-overlay-pool 0 "create_thin 0"
 246
 247         # Create a snapshot of the base image
 248         echo 0 $sz thin /dev/mapper/live-overlay-pool 0 $base | dmsetup create live-rw
 249     elif [ -z "$overlayfs" ]; then
 250         echo 0 $sz snapshot $base $over PO 8 | dmsetup create live-rw
 251     fi
 252
 253     # Create a device for the ro base of overlayed file systems.
 254     if [ -z "$overlayfs" ]; then
 255         echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create --readonly live-base
 256     fi
 257     ln -s $BASE_LOOPDEV /dev/live-base
 258 }
 259
 260 # we might have a genMinInstDelta delta file for anaconda to take advantage of
 261 if [ -e /run/initramfs/live/${live_dir}/osmin.img ]; then
 262     OSMINSQFS=/run/initramfs/live/${live_dir}/osmin.img
 263     # decompress the delta data
 264     dd if=$OSMINSQFS of=/run/initramfs/osmin.img 2> /dev/null
 265     OSMIN_SQUASHED_LOOPDEV=$( losetup -f )
 266     losetup -r $OSMIN_SQUASHED_LOOPDEV /run/initramfs/osmin.img
 267     mkdir -m 0755 -p /run/initramfs/squashfs.osmin
 268     mount -n -t squashfs -o ro $OSMIN_SQUASHED_LOOPDEV /run/initramfs/squashfs.osmin
 269     OSMIN_LOOPDEV=$( losetup -f )
 270     losetup -r $OSMIN_LOOPDEV /run/initramfs/squashfs.osmin/osmin
 271     umount -l /run/initramfs/squashfs.osmin
 272 fi
 273
 274 # we might have an embedded fs image on squashfs (compressed live)
 275 if [ -e /run/initramfs/live/${live_dir}/${squash_image} ]; then
 276     SQUASHED="/run/initramfs/live/${live_dir}/${squash_image}"
 277 fi
 278 if [ -e "$SQUASHED" ]; then
 279     if [ -n "$live_ram" ]; then
 280         echo 'Copying live image to RAM...' > /dev/kmsg
 281         echo ' (this may take a minute)' > /dev/kmsg
 282         dd if=$SQUASHED of=/run/initramfs/squashed.img bs=512 2> /dev/null
 283         echo 'Done copying live image to RAM.' > /dev/kmsg
 284         SQUASHED="/run/initramfs/squashed.img"
 285     fi
 286
 287     SQUASHED_LOOPDEV=$( losetup -f )
 288     losetup -r $SQUASHED_LOOPDEV $SQUASHED
 289     mkdir -m 0755 -p /run/initramfs/squashfs
 290     mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /run/initramfs/squashfs
 291
 292     if [ -d /run/initramfs/squashfs/LiveOS ]; then
 293         if [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then
 294             FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img"
 295         elif [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then
 296             FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img"
 297         fi
 298     elif [ -d /run/initramfs/squashfs/proc ]; then
 299         FSIMG=$SQUASHED
 300         if [ -z "$overlayfs" ]; then
 301             overlayfs="yes"
 302             [ -n "$DRACUT_SYSTEMD" ] && reloadsysrootmountunit="yes"
 303         fi
 304     else
 305         die "Failed to find a root filesystem in $SQUASHED."
 306         exit 1
 307     fi
 308 else
 309     # we might have an embedded fs image to use as rootfs (uncompressed live)
 310     if [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then
 311         FSIMG="/run/initramfs/live/${live_dir}/rootfs.img"
 312     elif [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then
 313         FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img"
 314     fi
 315     if [ -n "$live_ram" ]; then
 316         echo 'Copying live image to RAM...' > /dev/kmsg
 317         echo ' (this may take a minute or so)' > /dev/kmsg
 318         dd if=$FSIMG of=/run/initramfs/rootfs.img bs=512 2> /dev/null
 319         echo 'Done copying live image to RAM.' > /dev/kmsg
 320         FSIMG='/run/initramfs/rootfs.img'
 321     fi
 322 fi
 323
 324 if [ -n "$FSIMG" ]; then
 325     if [ -n "$writable_fsimg" ]; then
 326         # mount the provided filesystem read/write
 327         echo "Unpacking live filesystem (may take some time)" > /dev/kmsg
 328         mkdir -m 0755 /run/initramfs/fsimg/
 329         if [ -n "$SQUASHED" ]; then
 330             cp -v $FSIMG /run/initramfs/fsimg/rootfs.img
 331         else
 332             unpack_archive $FSIMG /run/initramfs/fsimg/
 333         fi
 334         FSIMG=/run/initramfs/fsimg/rootfs.img
 335     fi
 336     opt=-r
 337        # For writable DM images...
 338     if [ -z "$SQUASHED" -a -n "$live_ram" -a -z "$overlayfs" ] ||
 339        [ -n "$writable_fsimg" ] ||
 340        [ "$overlay" = none -o "$overlay" = None -o "$overlay" = NONE ]; then
 341         if [ -z "$readonly_overlay" ]; then
 342             opt=''
 343             setup=rw
 344         else
 345             setup=yes
 346         fi
 347     fi
 348     if [ "$FSIMG" = "$SQUASHED" ]; then
 349         BASE_LOOPDEV=$SQUASHED_LOOPDEV
 350     else
 351         BASE_LOOPDEV=$(losetup -f --show $opt $FSIMG)
 352         sz=$(blockdev --getsz $BASE_LOOPDEV)
 353     fi
 354     if [ "$setup" = rw ]; then
 355         echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create live-rw
 356     else
 357         # Add a DM snapshot or OverlayFS for writes.
 358         do_live_overlay
 359     fi
 360 fi
 361
 362 if [ -b "$OSMIN_LOOPDEV" ]; then
 363     # set up the devicemapper snapshot device, which will merge
 364     # the normal live fs image, and the delta, into a minimzied fs image
 365     echo "0 $sz snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV P 8" | dmsetup create --readonly live-osimg-min
 366 fi
 367
 368 if [ -n "$reloadsysrootmountunit" ]; then
 369     > /xor_overlayfs
 370     systemctl daemon-reload
 371 fi
 372
 373 ROOTFLAGS="$(getarg rootflags)"
 374
 375 if [ -n "$overlayfs" ]; then
 376     mkdir -m 0755 /run/rootfsbase
 377     if [ -n "$reset_overlay" ] && [ -L /run/overlayfs ]; then
 378         ovlfs=$(readlink /run/overlayfs)
 379         info "Resetting the OverlayFS overlay directory."
 380         rm -r -- ${ovlfs}/* ${ovlfs}/.* >/dev/null 2>&1
 381     fi
 382     if [ -n "$readonly_overlay" ]; then
 383         mkdir -m 0755 /run/rootfsbase-r
 384         mount -r $FSIMG /run/rootfsbase-r
 385         mount -t overlay LiveOS_rootfs-r -oro,lowerdir=/run/overlayfs-r:/run/rootfsbase-r /run/rootfsbase
 386     else
 387         mount -r $FSIMG /run/rootfsbase
 388     fi
 389     if [ -z "$DRACUT_SYSTEMD" ]; then
 390         printf 'mount -t overlay LiveOS_rootfs -o%s,%s %s\n' "$ROOTFLAGS" \
 391         'lowerdir=/run/rootfsbase,upperdir=/run/overlayfs,workdir=/run/ovlwork' \
 392         "$NEWROOT" > $hookdir/mount/01-$$-live.sh
 393     fi
 394 else
 395     if [ -z "$DRACUT_SYSTEMD" ]; then
 396         [ -n "$ROOTFLAGS" ] && ROOTFLAGS="-o $ROOTFLAGS"
 397         printf 'mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > $hookdir/mount/01-$$-live.sh
 398     fi
 399 fi
 400 [ -e "$SQUASHED" ] && umount -l /run/initramfs/squashfs
 401
 402 ln -s null /dev/root
 403
 404 need_shutdown
 405
 406 exit 0
 407