From c3c82f0f4438e63a55617219f611d5e44344c838 Mon Sep 17 00:00:00 2001
From: Matthias Maennich <maennich@google.com>
Date: Mon, 28 Oct 2019 15:13:59 +0000
Subject: [PATCH] build.sh: add repo meta information to kbuild build version

If this was built out of a repo tree (which is usually the case for the
prebuilt kernel images), compute KBUILD_BUILD_VERSION out of repo's
current manifest branch.

This creates an entry that can be inspected by `uname -v` at runtime or
can be derived from the kernel binary:

  $ zgrep -a 'Linux version' Image.gz
    Linux version 5.4.0 .... #1 repo:common-android-mainline SMP PREEMPT ..

Bug: 143359504
Change-Id: Ib6c2ce1f96e9a4003a74d448751750d61e97d584
Signed-off-by: Matthias Maennich <maennich@google.com>
---
 _setup_env.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/_setup_env.sh b/_setup_env.sh
index 379853f2ba..d0769464fe 100644
--- a/_setup_env.sh
+++ b/_setup_env.sh
@@ -32,6 +32,13 @@ export COMMON_OUT_DIR=$(readlink -m ${OUT_DIR:-${ROOT_DIR}/out/${BRANCH}})
 export OUT_DIR=$(readlink -m ${COMMON_OUT_DIR}/${KERNEL_DIR})
 export DIST_DIR=$(readlink -m ${DIST_DIR:-${COMMON_OUT_DIR}/dist})
 
+if which repo > /dev/null; then
+  # extract the repo branch name (e.g. common-android-mainline)
+  repo_branch=$(repo --color=never info -o | grep -E "Manifest merge branch" |
+                                             sed "s|.*refs/heads/\(.*\)|\1|")
+  export KBUILD_BUILD_VERSION="1 repo:$repo_branch"
+fi
+
 echo "========================================================"
 echo "= build config: ${ROOT_DIR}/${BUILD_CONFIG}"
 cat ${ROOT_DIR}/${BUILD_CONFIG}