From 72ce5c4cde612515451226a1b10f5b348a4a6a4c Mon Sep 17 00:00:00 2001 From: Paul Eggleton Date: Thu, 23 Feb 2012 19:26:09 +0000 Subject: conf/bitbake.conf: add DISTRO_FEATURES_BACKFILL When introducing new items to DISTRO_FEATURES that control functionality that is already enabled, in order to leave existing distro configuration unchanged we need a way to "backfill" these new feature items onto the existing DISTRO_FEATURES value. This introduces a DISTRO_FEATURES_BACKFILL variable whose items will be added to the end of DISTRO_FEATURES, unless they also appear in DISTRO_FEATURES_BACKFILL_CONSIDERED which distros can use in their configuration to prevent specific items from being added. Fixes [YOCTO #1946]. (From OE-Core rev: 738658d9d5ddef026d2929188744aa225324bf26) Signed-off-by: Paul Eggleton Signed-off-by: Richard Purdie --- meta/lib/oe/utils.py | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'meta/lib/oe') diff --git a/meta/lib/oe/utils.py b/meta/lib/oe/utils.py index 02d5442940..8912dac3bb 100644 --- a/meta/lib/oe/utils.py +++ b/meta/lib/oe/utils.py @@ -88,3 +88,23 @@ def param_bool(cfg, field, dflt = None): def inherits(d, *classes): """Return True if the metadata inherits any of the specified classes""" return any(bb.data.inherits_class(cls, d) for cls in classes) + +def distro_features_backfill(d): + # This construct allows the addition of new features to DISTRO_FEATURES + # that if not present would disable existing functionality, without + # disturbing distributions that have already set DISTRO_FEATURES. + # Distributions wanting to elide a value in DISTRO_FEATURES_BACKFILL should + # add the feature to DISTRO_FEATURES_BACKFILL_CONSIDERED + + backfill = (d.getVar("DISTRO_FEATURES_BACKFILL", True) or "").split() + considered = (d.getVar("DISTRO_FEATURES_BACKFILL_CONSIDERED", True) or "").split() + + addfeatures = [] + for feature in backfill: + if feature not in considered: + addfeatures.append(feature) + + if addfeatures: + return " %s" % (" ".join(addfeatures)) + else: + return "" -- cgit v1.2.3-54-g00ecf