From 4a8a9a18117fb989696608132bd06f2ebcb478d7 Mon Sep 17 00:00:00 2001
From: Matteo Hausner <matteo.hausner@gmail.com>
Date: Sat, 11 Jan 2025 21:31:17 +0100
Subject: [PATCH] build.gradle: correctly determine git directory in case the
 repo is used as a submodule

---
 build.gradle | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/build.gradle b/build.gradle
index b19c9c6c..a9ac198b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,7 +19,22 @@ plugins {
 	id 'org.gradlex.extra-java-module-info' version '1.9'
 }
 
-def git = Grgit.open(dir: projectDir)
+def dotGitFile = new File("$projectDir/.git")
+def gitDir
+if (dotGitFile.isFile()) {
+	def gitDirConfigValue = dotGitFile.readLines().stream().mapMulti { line, downstream ->
+		def match = line =~ /^gitdir: (\S*)/
+		def value = match[0][1];
+		if (value) {
+			downstream.accept value
+		}
+	}.findFirst().orElseThrow({ new GradleException('gitdir not set') })
+	gitDir = "$projectDir/$gitDirConfigValue"
+} else {
+	gitDir = projectDir
+}
+
+def git = Grgit.open dir: gitDir
 version = "${git.describe(longDescr: true).replaceFirst('-', '.').replaceFirst('-g', '-')}${((!git.status().isClean()) ? '.dirty' : '')}"
 
 base {