Re: [PATCH 0/9] Squashfs: Add support for LZMA compressed filesystems

From: Phillip Lougher
Date: Tue Dec 08 2009 - 13:01:35 EST


Peter Korsgaard wrote:
"root" == root <root@xxxxxxxxxxxxxxxxxxx> writes:

root> Hi,
root> The following patches add LZMA decompression support to Squashfs, using the
root> in-kernel LZMA decompression library.

root> The patches also add a decompression framework to Squashfs.
root> This allows LZMA decompression to be added cleanly, and it allows
root> additional decompressors to be easily added in the future.

root> To enable the in-kernel LZMA decompression code to be used by Squashfs,
root> there are two patches to the lzma code itself: one to make lzma available
root> to non-init code, and one to make lzma reentrant. These are obviously
root> not restricted to Squashfs, but are needed by any non-init code that
root> may wish to use lzma compression.

Nice, do you also have an mksquashfs with lzma support?


Yes, in Squashfs CVS (http://sourceforge.net/projects/squashfs/develop).
You'll need to edit the squashfs-tools Makefile to enable LZMA support.
The comments in the Makefile should, hopefully, explain how to
build LZMA support into Mksquashfs/Unsquashfs.

Once built-in, LZMA support can be specified using the -comp lzma option, i.e.

mksquashfs dir dir.img -comp lzma

Unsquashfs doesn't need any extra options, it automatically detects which
compression has been used.

You can tell which compression algorithms Mksquashfs/Unsquashfs support by
just typing the command on its own (i.e. mksquashfs, or unsquashfs). The
(de-)compressors available are displayed at the end of the output.

Phillip






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