[meta-oe][PATCH 4/4] uutils-coreutils: Exclude from world unless it is the selected provider

uutils-coreutils sets PROVIDES/RPROVIDES = "coreutils" and is a drop-in
replacement that cannot coexist with GNU coreutils; both ship the same
update-alternatives links. meta-oe/conf/layer.conf already selects between
them with PREFERRED_PROVIDER_coreutils{,-native,nativesdk-}, defaulting to
GNU coreutils.

PREFERRED_PROVIDER only disambiguates providers reached through a
dependency, not recipes built as explicit targets. Since uutils-coreutils
was in world, 'bitbake world' and 'bitbake universe' pulled both recipes
into the same task graph as targets, so bitbake reported:

  NOTE: Multiple .bb files are due to be built which each provide coreutils:
  NOTE: Multiple .bb files are due to be built which each provide coreutils-native:
  NOTE: Multiple .bb files are due to be built which each provide nativesdk-coreutils:

Key EXCLUDE_FROM_WORLD off the selected provider so only the chosen
implementation is built in world/universe. Building uutils-coreutils
explicitly, or selecting it via PREFERRED_PROVIDER_coreutils, still works.
This follows the existing conditional EXCLUDE_FROM_WORLD idiom used by
mpv, sox and vlc.

Signed-off-by: Khem Raj <[email protected]>
---
 .../uutils-coreutils/uutils-coreutils_0.9.0.bb             | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/meta-oe/recipes-core/uutils-coreutils/uutils-coreutils_0.9.0.bb b/meta-oe/recipes-core/uutils-coreutils/uutils-coreutils_0.9.0.bb
index 2c7d3a3200..9d16342e5c 100644
--- a/meta-oe/recipes-core/uutils-coreutils/uutils-coreutils_0.9.0.bb
+++ b/meta-oe/recipes-core/uutils-coreutils/uutils-coreutils_0.9.0.bb
@@ -18,6 +18,13 @@ require ${BPN}-crates.inc
 PROVIDES = "coreutils"
 RPROVIDES:${PN} = "coreutils"

+# This recipe is a drop-in replacement for coreutils and cannot coexist with it,
+# so only build it in world/universe when it is the selected provider. Otherwise
+# both recipes end up in the same task graph as explicit targets (PREFERRED_PROVIDER
+# only disambiguates dependencies, not targets) and bitbake warns that multiple
+# .bb files provide coreutils.
+EXCLUDE_FROM_WORLD = "${@'0' if d.getVar('PREFERRED_PROVIDER_coreutils') == 'uutils-coreutils' else '1'}"
+
 PACKAGECONFIG ?= "${@bb.utils.filter('DISTRO_FEATURES', 'selinux systemd', d)}"
 PACKAGECONFIG[selinux] = "--features feat_selinux,,clang-native libselinux-native libselinux"
 PACKAGECONFIG[systemd] = "--features feat_systemd_logind,,systemd"