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

   1 #!/bin/sh
   2 # -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
   3 # ex: ts=8 sw=4 sts=4 et filetype=sh
   4
   5 type getarg >/dev/null 2>&1 || . /lib/dracut-lib.sh
   6 type det_fs >/dev/null 2>&1 || . /lib/fs-lib.sh
   7
   8 [ -f /tmp/root.info ] && . /tmp/root.info
   9
  10 PATH=/usr/sbin:/usr/bin:/sbin:/bin
  11
  12 if getargbool 0 rd.live.debug -y rdlivedebug; then
  13     exec > /tmp/liveroot.$$.out
  14     exec 2>> /tmp/liveroot.$$.out
  15     set -x
  16 fi
  17
  18 [ -z "$1" ] && exit 1
  19 livedev="$1"
  20
  21 # parse various live image specific options that make sense to be
  22 # specified as their own things
  23 live_dir=$(getarg rd.live.dir live_dir)
  24 [ -z "$live_dir" ] && live_dir="LiveOS"
  25 getargbool 0 rd.live.ram -y live_ram && live_ram="yes"
  26 getargbool 0 rd.live.overlay.reset -y reset_overlay && reset_overlay="yes"
  27 getargbool 0 rd.live.overlay.readonly -y readonly_overlay && readonly_overlay="--readonly" || readonly_overlay=""
  28 overlay=$(getarg rd.live.overlay overlay)
  29
  30 # CD/DVD media check
  31 [ -b $livedev ] && fs=$(blkid -s TYPE -o value $livedev)
  32 if [ "$fs" = "iso9660" -o "$fs" = "udf" ]; then
  33     check="yes"
  34 fi
  35 getarg rd.live.check check || check=""
  36 if [ -n "$check" ]; then
  37     [ -x /bin/plymouth ] && /bin/plymouth --hide-splash
  38     checkisomd5 --verbose $livedev || :
  39     if [ $? -ne 0 ]; then
  40         die "CD check failed!"
  41         exit 1
  42     fi
  43     [ -x /bin/plymouth ] && /bin/plymouth --show-splash
  44 fi
  45
  46 # determine filesystem type for a filesystem image
  47 det_img_fs() {
  48     blkid -s TYPE -u noraid -o value "$1"
  49 }
  50
  51 for arg in $CMDLINE; do case $arg in ro|rw) liverw=$arg ;; esac; done
  52 # mount the backing of the live image first
  53 mkdir -m 0755 -p /run/initramfs/live
  54 if [ -f $livedev ]; then
  55     # no mount needed - we've already got the LiveOS image in initramfs
  56     # check filesystem type and handle accordingly
  57     fstype=$(det_img_fs $livedev)
  58     case $fstype in
  59         squashfs) SQUASHED=$livedev;;
  60         auto) die "cannot mount live image (unknown filesystem type)" ;;
  61         *) FSIMG=$livedev ;;
  62     esac
  63     [ -e /sys/fs/$fstype ] || modprobe $fstype
  64 else
  65     mount -n -t $fstype -o ${liverw:-ro} $livedev /run/initramfs/live
  66     if [ "$?" != "0" ]; then
  67         die "Failed to mount block device of live image"
  68         exit 1
  69     fi
  70 fi
  71
  72 # overlay setup helper function
  73 do_live_overlay() {
  74     # create a sparse file for the overlay
  75     # overlay: if non-ram overlay searching is desired, do it,
  76     #              otherwise, create traditional overlay in ram
  77     OVERLAY_LOOPDEV=$( losetup -f )
  78
  79     l=$(blkid -s LABEL -o value $livedev) || l=""
  80     u=$(blkid -s UUID -o value $livedev) || u=""
  81
  82     if [ -z "$overlay" ]; then
  83         pathspec="/${live_dir}/overlay-$l-$u"
  84     elif ( echo $overlay | grep -q ":" ); then
  85         # pathspec specified, extract
  86         pathspec=$( echo $overlay | sed -e 's/^.*://' )
  87     fi
  88
  89     if [ -z "$pathspec" -o "$pathspec" = "auto" ]; then
  90         pathspec="/${live_dir}/overlay-$l-$u"
  91     fi
  92     devspec=$( echo $overlay | sed -e 's/:.*$//' )
  93
  94     # need to know where to look for the overlay
  95     setup=""
  96     if [ -n "$devspec" -a -n "$pathspec" -a -n "$overlay" ]; then
  97         mkdir -m 0755 /run/initramfs/overlayfs
  98         mount -n -t auto $devspec /run/initramfs/overlayfs || :
  99         if [ -f /run/initramfs/overlayfs$pathspec -a -w /run/initramfs/overlayfs$pathspec ]; then
 100             losetup $OVERLAY_LOOPDEV /run/initramfs/overlayfs$pathspec
 101             if [ -n "$reset_overlay" ]; then
 102                 dd if=/dev/zero of=$OVERLAY_LOOPDEV bs=64k count=1 2>/dev/null
 103             fi
 104             setup="yes"
 105         fi
 106         umount -l /run/initramfs/overlayfs || :
 107     fi
 108
 109     if [ -z "$setup" ]; then
 110         if [ -n "$devspec" -a -n "$pathspec" ]; then
 111             warn "Unable to find persistent overlay; using temporary"
 112             sleep 5
 113         fi
 114
 115         dd if=/dev/null of=/overlay bs=1024 count=1 seek=$((512*1024)) 2> /dev/null
 116         losetup $OVERLAY_LOOPDEV /overlay
 117     fi
 118
 119     # set up the snapshot
 120     echo 0 `blockdev --getsz $BASE_LOOPDEV` snapshot $BASE_LOOPDEV $OVERLAY_LOOPDEV p 8 | dmsetup create $readonly_overlay live-rw
 121 }
 122
 123 # live cd helper function
 124 do_live_from_base_loop() {
 125     do_live_overlay
 126 }
 127
 128 # we might have a genMinInstDelta delta file for anaconda to take advantage of
 129 if [ -e /run/initramfs/live/${live_dir}/osmin.img ]; then
 130     OSMINSQFS=/run/initramfs/live/${live_dir}/osmin.img
 131 fi
 132
 133 if [ -n "$OSMINSQFS" ]; then
 134     # decompress the delta data
 135     dd if=$OSMINSQFS of=/osmin.img 2> /dev/null
 136     OSMIN_SQUASHED_LOOPDEV=$( losetup -f )
 137     losetup -r $OSMIN_SQUASHED_LOOPDEV /osmin.img
 138     mkdir -m 0755 -p /run/initramfs/squashfs.osmin
 139     mount -n -t squashfs -o ro $OSMIN_SQUASHED_LOOPDEV /run/initramfs/squashfs.osmin
 140     OSMIN_LOOPDEV=$( losetup -f )
 141     losetup -r $OSMIN_LOOPDEV /run/initramfs/squashfs.osmin/osmin
 142     umount -l /run/initramfs/squashfs.osmin
 143 fi
 144
 145 # we might have an embedded fs image to use as rootfs (uncompressed live)
 146 if [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then
 147     FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img"
 148 elif [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then
 149     FSIMG="/run/initramfs/live/${live_dir}/rootfs.img"
 150 fi
 151
 152 if [ -n "$FSIMG" ] ; then
 153     BASE_LOOPDEV=$( losetup -f )
 154     losetup -r $BASE_LOOPDEV $FSIMG
 155
 156     do_live_from_base_loop
 157 fi
 158
 159 # we might have an embedded fs image on squashfs (compressed live)
 160 if [ -e /run/initramfs/live/${live_dir}/squashfs.img ]; then
 161     SQUASHED="/run/initramfs/live/${live_dir}/squashfs.img"
 162 fi
 163
 164 if [ -e "$SQUASHED" ] ; then
 165     if [ -n "$live_ram" ] ; then
 166         echo "Copying live image to RAM..."
 167         echo "(this may take a few minutes)"
 168         dd if=$SQUASHED of=/squashed.img bs=512 2> /dev/null
 169         umount -n /run/initramfs/live
 170         echo "Done copying live image to RAM."
 171         eject -p $livedev || :
 172         SQUASHED="/squashed.img"
 173     fi
 174
 175     SQUASHED_LOOPDEV=$( losetup -f )
 176     losetup -r $SQUASHED_LOOPDEV $SQUASHED
 177     mkdir -m 0755 -p /run/initramfs/squashfs
 178     mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /run/initramfs/squashfs
 179
 180     BASE_LOOPDEV=$( losetup -f )
 181     if [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then
 182         losetup -r $BASE_LOOPDEV /run/initramfs/squashfs/LiveOS/ext3fs.img
 183     elif [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then
 184         losetup -r $BASE_LOOPDEV /run/initramfs/squashfs/LiveOS/rootfs.img
 185     fi
 186
 187     umount -l /run/initramfs/squashfs
 188
 189     do_live_from_base_loop
 190 fi
 191
 192 if [ -b "$OSMIN_LOOPDEV" ]; then
 193     # set up the devicemapper snapshot device, which will merge
 194     # the normal live fs image, and the delta, into a minimzied fs image
 195     echo "0 $( blockdev --getsz $BASE_LOOPDEV ) snapshot $BASE_LOOPDEV $OSMIN_LOOPDEV p 8" | dmsetup create --readonly live-osimg-min
 196 fi
 197
 198 ROOTFLAGS="$(getarg rootflags)"
 199 if [ -n "$ROOTFLAGS" ]; then
 200     ROOTFLAGS="-o $ROOTFLAGS"
 201 fi
 202
 203 if [ -b "$BASE_LOOPDEV" ]; then
 204     ln -s $BASE_LOOPDEV /run/initramfs/live-baseloop
 205 fi
 206 ln -s /dev/mapper/live-rw /dev/root
 207 printf '/bin/mount %s /dev/mapper/live-rw %s\n' "$ROOTFLAGS" "$NEWROOT" > $hookdir/mount/01-$$-live.sh
 208
 209 need_shutdown
 210
 211 exit 0