On Sun, Jun 17, 2012 at 6:25 PM, David Laban <[email protected]> wrote:
> Just a heads up that I'm working on a couple of patches to > livecd-iso-to-disk that let you up the filesystem limit. > > The current setup is: > > filesystem > |_ livecd.iso > |_ squashfs.img --read-only? > |_ ext3fs.img > > I have prototyped it, and I had to: > > * cp --sparse=always ext3fs.img <filesystem with sparse support and > 2.5GB free> // If I could mount the squashfs image read-write or do > some kind of snapshot/overlay, this would be unneccesary > > * dd seek=8GB of=ext3fs.img > * losetup ext3fs.img > * resize2fs /dev/loopX // automatically expands to fill the whole > 'partition' == 8GB > * mkdir -p tmp/LiveOS/ > * mv ext3fs.img tmp/LiveOS/ > * mksquashfs tmp squashfs.img // takes ages: has to re-compress 2.5GB > > Can anyone give any hints on making this more efficient, or should I > submit a patch to > > http://git.fedorahosted.org/git/?p=hosted/livecd;a=blob;f=tools/livecd-iso-to-disk.sh;hb=HEAD > as it is? > > Also, I need to do more research into snapshots (had a wild goose > chase grepping the kernel source for "overlay") but I think that I > might be able to re-compact the overlay file into the squashfs using > the above process. Would anyone be interested in seeing a patch of > that form? > Yes, such a patch is feasible. See http://wiki.sugarlabs.org/go/LiveOS_image for more information on the LiveOS image. I have a version of edit-livecd, http://git.fedorahosted.org/git/?p=hosted/livecd;a=blob;f=tools/edit-livecd;hb=HEAD , which I call editliveos.py, that uses a virtual filesystem mirror to merge the ext3fs.img with the overlay to create an updated, single filesystem image file (instead of using rsync, as the current version does with the --clone option). (I haven't tested the rsync version in a long time, since it failed, http://www.mail-archive.com/[email protected]/msg01052.html , and I haven't seen other reports of its use.) My current version of editliveos.py has a perplexing bug where an image built from a live running source will reboot, but one built from an attached LiveOS source fails to reboot. This was not previously a problem, and I suspect some side effect of the systemd startup changes on the way new sessions or seats are authenticated. The new version involves updates to fs.py, util.py, live.py, and creator.py and I have not submitted patches yet for review, but I have just posted whole files at http://git.sugarlabs.org/soas/sugar-clone-extensions/commit/8c4e03323fc9a7e630e6c62213bb842909fbaa00 --Fred > Also, I think that pre-allocating 2GB from /dev/zero on FAT > filesystems is pointless and needlessly slow. Doesn't the overlay grow > itself anyway? The overlay file is fixed in size. Also, isn't the limit 4GB for FAT32? > > David. > -- > livecd mailing list > [email protected] > https://admin.fedoraproject.org/mailman/listinfo/livecd
-- livecd mailing list [email protected] https://admin.fedoraproject.org/mailman/listinfo/livecd
