From: Jonathan McDowell <noodles@earth.li>
Date: Fri, 15 Sep 2023 02:59:00 +0000 (+0530)
Subject: Support shallow git checkouts when configuring cmake
X-Git-Tag: onak-0.6.3~17
X-Git-Url: http://the.earth.li/gitweb/?p=onak.git;a=commitdiff_plain;h=810840e09b049f96ac706abb1cd7d4fb8f1c03a2

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.
---

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()