kernel-yocto: allow patch author date to be commit date

In situations where a buid needs to be reproducible, it is
sometimes desireable to use a patches author date, versus the
time when it is applied. This generates a consistent hash
between different patch applications.

We leverage the existing KERNEL_DEBUG_TIMESTAMPS to trigger
the use of a new option to kgit-s2q. This allows us to use
the author date in a reproducible configuration, but disable
it if we need the current time/date.

(From OE-Core rev: 8dbce9b13960acfd6889567c11456e3c73a783b5)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ebe2411ce78d5e4ea49b9b4cb732b461ecc32ca6)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/meta/classes/kernel-yocto.bbclass b/meta/classes/kernel-yocto.bbclass
index afccffcf17..e8046bb8f6 100644
--- a/meta/classes/kernel-yocto.bbclass
+++ b/meta/classes/kernel-yocto.bbclass
@@ -322,7 +322,11 @@ do_patch() {
         meta_dir=$(kgit --meta)
         (cd ${meta_dir}; ln -sf patch.queue series)
         if [ -f "${meta_dir}/series" ]; then
-                kgit-s2q --gen -v --patches .kernel-meta/
+                kgit_extra_args=""
+                if [ "${KERNEL_DEBUG_TIMESTAMPS}" != "1" ]; then
+                    kgit_extra_args="--commit-sha author"
+                fi
+                kgit-s2q --gen -v $kgit_extra_args --patches .kernel-meta/
                 if [ $? -ne 0 ]; then
                         bberror "Could not apply patches for ${KMACHINE}."
                         bbfatal_log "Patch failures can be resolved in the linux source directory ${S})"