[poky] SSTATE MIRRORS only partly working?

[Richard Purdie]

On Wed, 2011-05-11 at 08:11 -0600, Gary Thomas wrote:
> Trying my SSTATE_MIRROR test with a recent Poky tree, I find
> that for the most part, it doesn't work as expected (at least
> not as I expect).
> 
> Here's my test setup:
>    * Create a complete build
>      % . /local/poky/oe-init-build-env /local/build_orig
>      % bitbake SOME-RECIPE
>    * Use that build for the SSTATE_MIRROR
>      % . /local/poky/oe-init-build-env /local/build_test
>      -- edit conf/local.conf to have these lines:
>          SSTATE_MIRRORS ?= "\
>          file://.* file:///local/build_orig/sstate-cache/"
>      % bitbake SOME-RECIPE
> 
> What I find is that this second build is rebuilding a lot of
> things, most strikingly the -native packages.  Looking into
> it, I see that the original build creates
>    sstate-pseudo-native-i686-linux-1.0-r0-i686-2-999fef0f7f260a6672c3678a831fa36f_populate-sysroot.tgz
> but when the test build runs, it's looking for
>    sstate-pseudo-native-i686-linux-1.0-r0-i686-2-feb469d055bfc4f32074e7e9499eaf22_populate-sysroot.tgz
> 
> Odd, but it's not always different, for example
>    sstate-perl-native-i686-linux-5.12.3-r2-i686-2-75d16ce5b7c945262d819c24f59d1c9f_populate-sysroot.tgz
> is the same in both builds and is thus shared.
> 
> Note that nothing else has changed, other than the process above.
> The COREBASE tree is identical/untouched.
> 
> Am I missing something here?

Did you try comparing the siginfo/sigdata files using bitbake-diffsigs?

That should give some clues about what changed.

Cheers,

Richard