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dmsquash-live-root: Avoid an overlay for persistent, uncompressed, read-write live installations. 

Persistent, uncompressed live installations can avoid overlays with a new rd.live.overlay=none flag.
Non-persistent rd.live.ram boots can also take advantage of persistent home.img filesystems.
master
Frederick Grose 2015-10-09 16:56:19 -04:00
parent 0ea86cb727
commit 8b5ee88ff6
1 changed files with 28 additions and 19 deletions
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47
modules.d/90dmsquash-live/dmsquash-live-root.sh
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@ -203,14 +203,10 @@ 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
if [ -n "$live_ram" ]; then
echo "Copying live image to RAM..."
echo "(this may take a few minutes)"
dd if=$SQUASHED of=/run/initramfs/squashed.img bs=512 2> /dev/null
umount -n /run/initramfs/live
echo "Done copying live image to RAM."
SQUASHED="/run/initramfs/squashed.img"
fi
@ -220,24 +216,32 @@ if [ -e "$SQUASHED" ] ; then
mkdir -m 0755 -p /run/initramfs/squashfs
mount -n -t squashfs -o ro $SQUASHED_LOOPDEV /run/initramfs/squashfs

fi

# we might have an embedded fs image to use as rootfs (uncompressed live)
if [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then
FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img"
elif [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then
FSIMG="/run/initramfs/live/${live_dir}/rootfs.img"
elif [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then
FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img"
elif [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then
FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img"
if [ -f /run/initramfs/squashfs/LiveOS/ext3fs.img ]; then
FSIMG="/run/initramfs/squashfs/LiveOS/ext3fs.img"
elif [ -f /run/initramfs/squashfs/LiveOS/rootfs.img ]; then
FSIMG="/run/initramfs/squashfs/LiveOS/rootfs.img"
fi
else
# we might have an embedded fs image to use as rootfs (uncompressed live)
if [ -e /run/initramfs/live/${live_dir}/ext3fs.img ]; then
FSIMG="/run/initramfs/live/${live_dir}/ext3fs.img"
elif [ -e /run/initramfs/live/${live_dir}/rootfs.img ]; then
FSIMG="/run/initramfs/live/${live_dir}/rootfs.img"
fi
if [ -n "$live_ram" ]; then
echo 'Copying live image to RAM...'
echo '(this may take a few minutes)'
dd if=$FSIMG of=/run/initramfs/rootfs.img bs=512 2> /dev/null
echo 'Done copying live image to RAM.'
FSIMG='/run/initramfs/rootfs.img'
fi
fi

if [ -n "$FSIMG" ] ; then
BASE_LOOPDEV=$( losetup -f )

if [ -n "$writable_fsimg" ] ; then
# mount the provided fileysstem read/write
# mount the provided filesystem read/write
echo "Unpacking live filesystem (may take some time)"
mkdir /run/initramfs/fsimg/
if [ -n "$SQUASHED" ]; then
@ -245,8 +249,13 @@ if [ -n "$FSIMG" ] ; then
else
unpack_archive $FSIMG /run/initramfs/fsimg/
fi
losetup $BASE_LOOPDEV /run/initramfs/fsimg/rootfs.img
echo "0 $( blockdev --getsize $BASE_LOOPDEV ) linear $BASE_LOOPDEV 0" | dmsetup create live-rw
FSIMG = /run/initramfs/fsimg/rootfs.img
fi
if [ -n "$writable_fsimg" ] || [ -z "$SQUASHED" -a -n "$live_ram" ] ||
[ "$overlay" = none -o "$overlay" = None -o "$overlay" = NONE ]; then
losetup $BASE_LOOPDEV $FSIMG
sz=$(blockdev --getsz $BASE_LOOPDEV)
echo 0 $sz linear $BASE_LOOPDEV 0 | dmsetup create live-rw
else
# mount the filesystem read-only and add a dm snapshot for writes
losetup -r $BASE_LOOPDEV $FSIMG