CMake: prepopulate GIT vars from env

Author: fufexan

CMakeLists.txt

@@ -128,13 +128,41 @@ set(HYPRGRAPHICS_VERSION "${hyprgraphics_dep_VERSION}")
 
 find_package(Git QUIET)
 
-set(GIT_COMMIT_HASH "unknown")
-set(GIT_BRANCH "unknown")
-set(GIT_COMMIT_MESSAGE "unknown")
-set(GIT_COMMIT_DATE "unknown")
-set(GIT_DIRTY "unknown")
-set(GIT_TAG "unknown")
-set(GIT_COMMITS "0")
+# Populate variables with env vars if present
+set(GIT_COMMIT_HASH "$ENV{GIT_COMMIT_HASH}")
+if(NOT GIT_COMMIT_HASH)
+  set(GIT_COMMIT_HASH "unknown")
+endif()
+
+set(GIT_BRANCH "$ENV{GIT_BRANCH}")
+if(NOT GIT_BRANCH)
+  set(GIT_BRANCH "unknown")
+endif()
+
+set(GIT_COMMIT_MESSAGE "$ENV{GIT_COMMIT_MESSAGE}")
+if(NOT GIT_COMMIT_MESSAGE)
+  set(GIT_COMMIT_MESSAGE "unknown")
+endif()
+
+set(GIT_COMMIT_DATE "$ENV{GIT_COMMIT_DATE}")
+if(NOT GIT_COMMIT_DATE)
+  set(GIT_COMMIT_DATE "unknown")
+endif()
+
+set(GIT_DIRTY "$ENV{GIT_DIRTY}")
+if(NOT GIT_DIRTY)
+  set(GIT_DIRTY "unknown")
+endif()
+
+set(GIT_TAG "$ENV{GIT_TAG}")
+if(NOT GIT_TAG)
+  set(GIT_TAG "unknown")
+endif()
+
+set(GIT_COMMITS "$ENV{GIT_COMMITS}")
+if(NOT GIT_COMMITS)
+  set(GIT_COMMITS "0")
+endif()
 
 if(Git_FOUND)
   execute_process(