[oe] no-distro goal and SRCREV=1 in bitbake.conf

[Koen Kooi]

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Hi,

SRCREV=1 in bitbake.conf forces people to use a distro, which is bad(TM) according to the
OEDEM minutes.

My short term solution:

* SRCREV = "${@bb.fetch.get_srcrev(d)}" in bitbake.conf
* SRCREV ?= <foo> in recipes
* SRCREV_pn-baz ?= <bar> in distro includes or local.conf

For the medium and long term we should consider adding snapshot recipes for 'proven'
revisions next to the 'floating' ones, even if Richard thinks it's a waste of space.
Having a host of 'unbreak me' includes is also against our 'sane defaults' goal we decided
on at OEDEM.

Comments/ideas/flames?

regards.

Koen
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