Difference between revisions of "Talk:LiveOS image"

From Sugar Labs
Jump to navigation Jump to search
(Merge in that persistent overlay, don't expand it! Version 0.1, having formatting issues)
 
(Replaced content with "Previous content for this page is now at the Fedora Project wiki, fedora:Talk:LiveOS image. --~~~~")
 
(7 intermediate revisions by 2 users not shown)
Line 1: Line 1:
−
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.
 
−
 
 
−
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.
 
−
 
 
−
Step 1: Get access to read-write base image, note that I got loop2 and loop3 here, YMMV.
 
−
<nowiki>mkdir squashfs
 
−
mount -o loop /run/media/*/LIVE/LiveOS/squashfs.img squashfs/
 
−
cp squashfs/LiveOS/ext3fs.img .</nowiki>
 
−
 
 
−
Step 2: Set up loopback and device mapper devices for persistent overlay, base device mapper and snapshot.
 
−
<nowiki>losetup -f ext3fs.img
 
−
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/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
 
−
<nowiki>dmsetup suspend top
 
−
echo 0 $(blockdev --getsize /dev/loop2) snapshot-merge /dev/loop2 /dev/loop3 p 8 | dmsetup create mergeomatic && dmsetup status mergeomatic
 
−
dmsetup status
 
−
dmsetup remove mergeomatic</nowiki>
 
−
 
 
−
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
 
−
dmsetup resume top
 
−
mkdir root
 
−
mount /dev/mapper/top root
 
−
cd root
 
−
chroot .</nowiki>
 
−
 
 
−
Step 5: Clean up.
 
−
<nowiki>cd ..
 
−
umount root
 
−
dmsetup remove top
 
−
dmsetup remove orig
 
−
losetup -d /dev/loop2
 
−
losetup -d /dev/loop3
 
−
umount squashfs/</nowiki>
 
−
 
 
−
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>
 

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)

Retrieved from "https://wiki.sugarlabs.org/index.php?title=Talk:LiveOS_image&oldid=82385"