From 8ca7673cfcdbe60d4bad7217fc3c67c283af18bf Mon Sep 17 00:00:00 2001
From: Eugene Susla <eugenesusla@google.com>
Date: Mon, 29 Jul 2019 13:57:59 -0700
Subject: [PATCH] Auto-build/update codegen

Exempt-From-Owner-Approval: introduces separate utility; doesn't touch anything around it
Test: 1. Manually enter version/presence of build artifact,
and ensure `codegen FILENAME` still works
2. run codegen again without altering version, ensure no build triggered
Change-Id: Iaa253a430e627d0e7c25781cde535958f77db97f
---
 scripts/OWNERS  |  1 +
 scripts/codegen | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100755 scripts/codegen

diff --git a/scripts/OWNERS b/scripts/OWNERS
index 2f9e5942d..dbae40ffc 100644
--- a/scripts/OWNERS
+++ b/scripts/OWNERS
@@ -4,3 +4,4 @@ danalbert@google.com
 enh@google.com
 jmgao@google.com
 rprichard@google.com
+per-file codegen = eugenesusla@google.com
\ No newline at end of file
diff --git a/scripts/codegen b/scripts/codegen
new file mode 100755
index 000000000..799347ce2
--- /dev/null
+++ b/scripts/codegen
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+top="$(dirname $0)/../.."
+
+function buildCodegen() {
+	$top/build/soong/soong_ui.bash --build-mode --all-modules --dir="$PWD" -j codegen_cli 1>&2
+}
+
+if ! command -v codegen_cli 2>&1 >/dev/null; then
+	# First time running codegen
+	buildCodegen
+else
+	latestVersion=$(cat $top/frameworks/base/tools/codegen/src/com/android/codegen/SharedConstants.kt | grep 'CODEGEN_VERSION =' | awk '{ print $5 }' | tr -d '"')
+	if [[ $(codegen_cli --version) != $latestVersion ]]; then
+		# Update codegen
+		buildCodegen
+	fi
+fi
+
+exec codegen_cli "$@"