From 794640bdb5c144db97faa9cadf1051ff837b7112 Mon Sep 17 00:00:00 2001
From: Thomas <>
Date: Tue, 11 Apr 2023 17:48:32 +0200
Subject: build(core): Fix the build in the context of a git submodule

from TUG:
The gradle build file tries to infer the commit hash by reading the
files in the .git subdirectory. But in case the repo is checked out as
a submodule there is no such directory, only a file pointing to the
parent checkout.

Instead of depending on git internals just ask git directly.
---
 build.gradle | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/build.gradle b/build.gradle
index fe9c877a..ef7fc0a6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -187,21 +187,9 @@ task releases(type: Copy) {
 
 
 def getCheckedOutGitCommitHash() {
-	def gitFolder = "$projectDir/.git/"
-	def takeFromHash = 40
-	/*
-	 * '.git/HEAD' contains either
-	 *      in case of detached head: the currently checked out commit hash
-	 *      otherwise: a reference to a file containing the current commit hash
-	 */
-	def head = new File(gitFolder + "HEAD").text.split(":") // .git/HEAD
-	def isCommit = head.length == 1 // e5a7c79edabbf7dd39888442df081b1c9d8e88fd
-	// def isRef = head.length > 1     // ref: refs/heads/master
- 
-	if(isCommit) return head[0].trim().take(takeFromHash) // e5a7c79edabb
- 
-	def refHead = new File(gitFolder + head[1].trim()) // .git/refs/heads/master
-	refHead.text.trim().take takeFromHash
+    def takeFromHash = 40
+    'git rev-parse --verify HEAD'.execute().text.trim().take takeFromHash
+
 }
 /*
 task docs(type: Javadoc) {
-- 
cgit v1.2.3