Exit build with error if we're not on the correct godot branch

.scripts/rebase_godot.sh

@@ -65,4 +65,5 @@ git push nikitalita $NEW_BRANCH_NAME --set-upstream
 
 # change the branch name in .github/workflows/all_builds.yml and the README.md
 sed_in_place "s/GODOT_MAIN_SYNC_REF: .*/GODOT_MAIN_SYNC_REF: $NEW_BRANCH_NAME/" "$GDRE_PATH/.github/workflows/all_builds.yml"
+sed_in_place "s/GODOT_MAIN_SYNC_REF = .*/GODOT_MAIN_SYNC_REF = \"$NEW_BRANCH_NAME\"/" "$GDRE_PATH/SCsub"
 sed_in_place "s/ @ branch \`.*\`/ @ branch \`$NEW_BRANCH_NAME\`/" "$GDRE_PATH/README.md"

SCsub

@@ -1,7 +1,9 @@
 #!/usr/bin/env python
 
+import subprocess
 from SCons.Script.SConscript import SConsEnvironment
 import os
+import sys
 from typing import TYPE_CHECKING
 
 from build import gdre_icon_builder  # pyright: ignore[reportImplicitRelativeImport]
@@ -21,6 +23,7 @@ if TYPE_CHECKING:
 Import("env")
 Import("env_modules")
 
+GODOT_MAIN_SYNC_REF = "gdre-wb-f964fa714f5"
 MODULE_DIR = get_module_dir(env)
 BUILD_DIR = get_build_dir(env)
 
@@ -37,6 +40,25 @@ INCLUDE_DIRS = [
     AXML_DEC_INCLUDE_DIR,
 ]
 
+if not env["ignore_godot_branch_check"]:
+    ROOT_GODOT_DIR: str = str(env.Dir("#").abspath)
+    try:
+        godot_branch: str = subprocess.run(
+            f"git -C {ROOT_GODOT_DIR} rev-parse --abbrev-ref HEAD", shell=True, capture_output=True, text=True
+        ).stdout.strip()
+        if godot_branch != GODOT_MAIN_SYNC_REF:
+            print(
+                f"""
+**************************************************
+Error: Godot repository is not on expected '{GODOT_MAIN_SYNC_REF}' branch, please checkout the correct branch and try again
+(set Scons option 'ignore_godot_branch_check' to true to ignore this error and build anyway)
+**************************************************
+"""
+            )
+            sys.exit(1)
+    except Exception as e:
+        print(f"Error running git command: {e}")
+
 
 env_gdsdecomp = env_modules.Clone()
 

config.py

@@ -77,6 +77,7 @@ def get_opts(platform):
     opts = [
         BoolVariable("disable_godot_mono_decomp", "Disable Godot Mono Decompilation", False),
         BoolVariable("disable_gifski", "Disable Gifski", False),
+        BoolVariable("ignore_godot_branch_check", "Ignore Godot branch check", False),
     ]
     if not (platform == "android" or platform == "macos"):
         opts.append(BoolVariable("use_static_godot_mono_decomp", "Build Godot Mono Decomp library as static", False))