[oe] bitbaking aufs

[Vitus Jensen]

Hej!

I would like to use a layered filesystem in our ppc603e-based machine: the 
rootfs built from openembedded would be read-only, any customizations go 
to a writable filesystem and should the need occur to start fresh all I 
need is a mechanism to remove the contents of the writable filesystem.

In openembedded (2011.03) there is unionfs and aufs 
(http://aufs.sourceforge.net/), aufs is more actively developed so I would 
like to use that.  Unfortunately the recipe in oe uses aufs1 which does 
not support current kernels.  Could change that to aufs2.2 but 
aufs2 now has two seperated repos (patched kernel or source plus patches = 
"standalone") and I'm in doubt how to proceed.  Especially as aufs_cvs.bb 
contains some CONFIG_xxx voodo.

My intention is to use the "standalone" repo and "inherit module" from oe 
but how do I apply kernel patches in this case?  The kernel resides in 
${TMPDIR}/sysroots, do I patch that???  Or do I have to apply those 
patches during kernel build?  I could extract them from git and add them 
to the kernel recipe for my machine but this doesn't feel right,

I think, I need some advice how to best get aufs2.2 building.  And a good 
example for a "inherit module" recipe using sysroot kernel source might 
help.  Which should I use as example for aufs?

Best regards,
    Vitus

-- 
Vitus Jensen, Hannover, Germany, Universe (current)
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