From 810840e09b049f96ac706abb1cd7d4fb8f1c03a2 Mon Sep 17 00:00:00 2001
From: Jonathan McDowell <noodles@earth.li>
Date: Fri, 15 Sep 2023 08:29:00 +0530
Subject: [PATCH] Support shallow git checkouts when configuring cmake

git will bale out if we're using a shallow checkout with no tags. Just
fall back to the short commit hash when that happens, so we can still
try and identify when the build was from.
---
 CMakeLists.txt | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index acacb34..2355ebe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,10 +41,18 @@ endif()
 # Pick up a git based version number for development builds
 find_package(Git)
 if (GIT_FOUND AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
-	EXECUTE_PROCESS(COMMAND ${GIT_EXECUTABLE} describe --tags --dirty
-		OUTPUT_VARIABLE GIT_VERSION
-		OUTPUT_STRIP_TRAILING_WHITESPACE)
-	string(REPLACE "onak-" "" VERSION ${GIT_VERSION})
+	if (EXISTS "${CMAKE_SOURCE_DIR}/.git/refs/tags/onak-0.6.2")
+		EXECUTE_PROCESS(
+			COMMAND ${GIT_EXECUTABLE} describe --tags --dirty
+			OUTPUT_VARIABLE GIT_VERSION
+			OUTPUT_STRIP_TRAILING_WHITESPACE)
+		string(REPLACE "onak-" "" VERSION ${GIT_VERSION})
+	else()
+		EXECUTE_PROCESS(
+			COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
+			OUTPUT_VARIABLE VERSION
+			OUTPUT_STRIP_TRAILING_WHITESPACE)
+	endif()
 else()
 	set(VERSION ${PROJECT_VERSION})
 endif()
-- 
2.39.5