Ubuntu Customization Kit

Use of squashfs-lzma to gain compression

Asked by Narcis Garcia

Could UCK detect if the Live-CD kernel is >=2.6.30 and then apply lzma capability with squashfs?

I've read that this reduces the size of ISO image, and/or fits more software in 700MiB

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Wolf Geldmacher (wolf-womaro) said : 		#1

Basically a good idea.

Did a little research but squashfs-lzma does not seem to be ready for prime time yet:

It would require the uck team to provide at least a patched set of squashfs-tools - and we don't have the ressources to create & maintain such a patched set.

Handling this as an enhacement request to take up once the Ubuntu delivered tools can handle it.

Created bug #654234 to track it.

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Narcis Garcia (narcisgarcia) said : 		#2

Could UCK apply the feature if also detects the availability of mksquashfs.lzma ?
What happens if mksquashfs is called always with -lzma parameter?

By this way, if the user gets the complete squashfs-tools , a ready UCK applies best compression.

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Wolf Geldmacher (wolf-womaro) said : 		#3

That's what I would aim for - we already have that kind of logic for initrd's that went from gzip/bzip2 to lzma with karmic.

On lucid "mksquashfs -lzma" just gives a usage message and exits.

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