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Step 1: Get access to read-write base image, note that I got loop2 and loop3 here, YMMV.
Step 1: Get access to read-write base image, note that I got loop2 and loop3 here, YMMV.
<nowiki>mkdir squashfs
<nowiki>mkdir squashfs
mount -o loop /run/media/*/LIVE/LiveOS/squashfs.img squashfs/
mount -o loop /run/media/*/LIVE/LiveOS/squashfs.img squashfs/
cp squashfs/LiveOS/ext3fs.img .</nowiki>
cp squashfs/LiveOS/ext3fs.img .</nowiki>
Step 2: Set up loopback and device mapper devices for persistent overlay, base device mapper and snapshot.
Step 2: Set up loopback and device mapper devices for persistent overlay, base device mapper and snapshot.
<nowiki>losetup -f ext3fs.img
<nowiki>losetup -f ext3fs.img
losetup -f /run/media/*/LIVE/LiveOS/overlay-*
losetup -f /run/media/*/LIVE/LiveOS/overlay-*
echo 0 $(blockdev --getsize /dev/loop2) linear /dev/loop2 0 |dmsetup create orig
echo 0 $(blockdev --getsize /dev/loop2) linear /dev/loop2 0 |dmsetup create orig
echo 0 $(blockdev --getsize /dev/mapper/orig) snapshot /dev/mapper/orig /dev/loop3 p 8 | dmsetup create top</nowiki>
echo 0 $(blockdev --getsize /dev/mapper/orig) snapshot /dev/mapper/orig /dev/loop3 p 8 | dmsetup create top</nowiki>
Step 3: Stop the snapshot device and merge the snapshot with the base
Step 3: Stop the snapshot device and merge the snapshot with the base
<nowiki>dmsetup suspend top
<nowiki>dmsetup suspend top
echo 0 $(blockdev --getsize /dev/loop2) snapshot-merge /dev/loop2 /dev/loop3 p 8 | dmsetup create mergeomatic && dmsetup status mergeomatic
echo 0 $(blockdev --getsize /dev/loop2) snapshot-merge /dev/loop2 /dev/loop3 p 8 | dmsetup create mergeomatic && dmsetup status mergeomatic
dmsetup status
dmsetup status
dmsetup remove mergeomatic</nowiki>
dmsetup remove mergeomatic</nowiki>
Step 4: Set the top device to no snapshot, and inspect the filesystem for results, if desired.
Step 4: Set the top device to no snapshot, and inspect the filesystem for results, if desired.
<nowiki>echo 0 $(blockdev --getsize /dev/loop2) linear /dev/loop2 0 | dmsetup load top
<nowiki>echo 0 $(blockdev --getsize /dev/loop2) linear /dev/loop2 0 | dmsetup load top
dmsetup resume top
dmsetup resume top
mkdir root
mkdir root
mount /dev/mapper/top root
mount /dev/mapper/top root
cd root
cd root
chroot .</nowiki>
chroot .</nowiki>
Step 5: Clean up.
Step 5: Clean up.
<nowiki>cd ..
<nowiki>cd ..
umount root
umount root
dmsetup remove top
dmsetup remove top
dmsetup remove orig
dmsetup remove orig
losetup -d /dev/loop2
losetup -d /dev/loop2
losetup -d /dev/loop3
losetup -d /dev/loop3
umount squashfs/</nowiki>
umount squashfs/</nowiki>
Step 6: Copy the root filesystem image back into the squashfs image, you may need -noappend
Step 6: Copy the root filesystem image back into the squashfs image, you may need -noappend
<nowiki>mksquashfs ext3fs.img /run/media/*/LIVE/LiveOS/squashfs.img</nowiki>
<nowiki>mksquashfs ext3fs.img /run/media/*/LIVE/LiveOS/squashfs.img</nowiki>