rootfs: Make BUILDNAME a weak default in reproducible_build_simple

11e45082ad00 ("rootfs-postcommands.bbclass: improve binary
reproducibility") fixed binary reproducibility of /etc/version, but with
the move to reproducibilty in all builds, setting /etc/version to
anything other than the default fixed timestamp is tricky because
rootfs_reproducible() runs very late.

rootfs.py uses BUILDNAME if set for /etc/version, so introduce a weak
default for BUILDNAME of "REPRODUCIBLE_TIMESTAMP_ROOTFS", when enabling
reproducible builds hence allowing BUILDNAME to be overridden elsewhere.

(From OE-Core rev: bbf28ea9100a4f86b052c5cd53c77f9e1c03fb09)

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/classes/reproducible_build_simple.bbclass b/meta/classes/reproducible_build_simple.bbclass
index d0842f0f90..153a076072 100644
--- a/meta/classes/reproducible_build_simple.bbclass
+++ b/meta/classes/reproducible_build_simple.bbclass
@@ -7,5 +7,6 @@ export PERL_HASH_SEED = "0"
 export SOURCE_DATE_EPOCH ??= "1520598896"
 
 REPRODUCIBLE_TIMESTAMP_ROOTFS ??= "1520598896"
+BUILDNAME ??= "${REPRODUCIBLE_TIMESTAMP_ROOTFS}"
 
 inherit podfix