conditional build-isolation

Author: maureeungaro

ci/dockerfile_creator.py

@@ -32,6 +32,8 @@ def docker_header(image: str, image_tag: str, geant4_tag: str) -> str:
     commands += f"# run bash instead of sh\n"
     commands += f"SHELL [\"/bin/bash\", \"-c\"]\n\n"
     commands += f"ENV AUTOBUILD=1\n"
+    if 'almalinux' in image.lower():
+        commands += f"ENV GEMC_NO_BUILD_ISOLATION=1\n"
     return commands
 
 

ci/install_python_env.py

@@ -31,6 +31,11 @@
 venv_python = str(venv_dir / 'bin' / 'python3')
 subprocess.run([venv_python, '-m', 'pip', 'install', '--no-cache-dir',
                 '--upgrade', 'pip', 'setuptools'], check=True)
-# --no-build-isolation avoids pip spawning an extra isolated build env, reducing memory pressure.
-subprocess.run([venv_python, '-m', 'pip', 'install', '--no-cache-dir',
-                '--no-build-isolation', pygemc_src], check=True)
+
+pip_args = [venv_python, '-m', 'pip', 'install', '--no-cache-dir']
+if os.environ.get('GEMC_NO_BUILD_ISOLATION') == '1':
+    # Avoids pip spawning an extra isolated build env; reduces memory pressure on
+    # constrained runners (e.g. AlmaLinux arm64). Requires pip/setuptools pre-installed above.
+    pip_args.append('--no-build-isolation')
+pip_args.append(pygemc_src)
+subprocess.run(pip_args, check=True)