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| It turns out that it is possible to merge down the persistent overlay into the base image, if you have access to another OS installation and sufficient disk space.
| | Previous content for this page is now at the Fedora Project wiki, [[fedora:Talk:LiveOS image]]. --[[User:FGrose|FGrose]] 22:15, 21 August 2012 (EDT) |
| I like that result better than just having to increase the overlay size without bounds.
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| Tested and working on Fedora 17, all commands as root. You will need disk space sufficient for the uncompressed size of the root filesystem, 4 GB in the case of Fedora 17 LiveCD/USB. I assume only one image and one user on the machine.
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| Step 1: Get access to read-write base image, note that I got loop2 and loop3 here, YMMV.
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| <nowiki>mkdir squashfs
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| mount -o loop /run/media/*/LIVE/LiveOS/squashfs.img squashfs/
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| cp squashfs/LiveOS/ext3fs.img .</nowiki>
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| Step 2: Set up loopback and device mapper devices for persistent overlay, base device mapper and snapshot.
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| <nowiki>losetup -f ext3fs.img
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| losetup -f /run/media/*/LIVE/LiveOS/overlay-*
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| echo 0 $(blockdev --getsize /dev/loop2) linear /dev/loop2 0 |dmsetup create orig
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| echo 0 $(blockdev --getsize /dev/mapper/orig) snapshot /dev/mapper/orig /dev/loop3 p 8 | dmsetup create top</nowiki>
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| Step 3: Stop the snapshot device and merge the snapshot with the base
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| <nowiki>dmsetup suspend top
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| echo 0 $(blockdev --getsize /dev/loop2) snapshot-merge /dev/loop2 /dev/loop3 p 8 | dmsetup create mergeomatic && dmsetup status mergeomatic
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| dmsetup status
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| dmsetup remove mergeomatic</nowiki>
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| Step 4: Set the top device to no snapshot, and inspect the filesystem for results, if desired.
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| <nowiki>echo 0 $(blockdev --getsize /dev/loop2) linear /dev/loop2 0 | dmsetup load top
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| dmsetup resume top
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| mkdir root
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| mount /dev/mapper/top root
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| cd root
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| chroot .</nowiki>
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| Step 5: Clean up.
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| <nowiki>cd ..
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| umount root
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| dmsetup remove top
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| dmsetup remove orig
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| losetup -d /dev/loop2
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| losetup -d /dev/loop3
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| umount squashfs/</nowiki>
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| Step 6: Copy the root filesystem image back into the squashfs image, you may need -noappend
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| <nowiki>mksquashfs ext3fs.img /run/media/*/LIVE/LiveOS/squashfs.img</nowiki>
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Latest revision as of 22:15, 21 August 2012
Previous content for this page is now at the Fedora Project wiki, fedora:Talk:LiveOS image. --FGrose 22:15, 21 August 2012 (EDT)