[OE-core] [RFC] One shared state reuse solution

[Chris Larson]

On Fri, Mar 30, 2012 at 2:54 PM, Chris Larson <clarson at kergoth.com> wrote:
> Over the past day, I've implemented a solution for the shared state
> reuse issues Mentor has seen with our poky-based product. This
> solution is similar in concept to what we had in our Mentor Embedded
> Linux 4 (non-yocto-based) product.
>
> This implementation restructures SSTATE_DIR such that non-target
> sstate archives are placed in a directory specific to the host we're
> running on, and allows fallback to sstates from compatible hosts. In
> addition, there is a hook in place for modifying the returned build
> host identifier string. Using these capabilities, configured as you'll
> see below at the gist, I can populate sstate-cache from a Centos5
> machine and fully reuse that shared state on a u1004 machine, but if I
> take the u1004 sstate-cache and pull it over to Centos5, all the
> non-target recipes will be rebuilt.

I forgot to mention, it allows fallback both within the SSTATE_DIR and
for mirrors in SSTATE_MIRRORS, as it iterates over each mirror and
adjusts the mirror uri to include each compatible host (including the
current one).
-- 
Christopher Larson