allow invoking mach from arbitary current working directory

mach

@@ -10,17 +10,18 @@
 # given in `.python-version` and python/mach_bootstrap.py will provision a new
 # environment that will be used for the subsequent runs.
 ''':' && {
+    MACH_DIR=$(dirname "$0");
     run_in_nix_if_needed() {
         if ([ -f /etc/NIXOS ] || [ -n "${MACH_USE_NIX}" ]) && [ -z "${IN_NIX_SHELL}" ]; then
             EXTRA_NIX_ARGS=${SERVO_ANDROID_BUILD:+'--arg buildAndroid true'}
-            echo "NOTE: Entering nix-shell $(pwd)/shell.nix"
-            exec nix-shell $EXTRA_NIX_ARGS --run "$*"
+            echo "NOTE: Entering nix-shell ${MACH_DIR}/shell.nix"
+            exec nix-shell ${MACH_DIR}/shell.nix $EXTRA_NIX_ARGS --run "$*"
         else
             exec $*
         fi
     }
 
-    run_in_nix_if_needed uv run python ./mach $*
+    run_in_nix_if_needed uv run python ${MACH_DIR}/mach $*
 }
 '''
 

mach.bat

@@ -1,3 +1,4 @@
 @echo off
 
-uv run python .\mach %*
+set workdir=%~dp0
+uv run python %workdir%mach %*

python/mach_bootstrap.py

@@ -80,9 +80,9 @@
 }
 
 
-def _process_exec(args):
+def _process_exec(args, cwd):
     try:
-        subprocess.check_output(args, stderr=subprocess.STDOUT)
+        subprocess.check_output(args, stderr=subprocess.STDOUT, cwd=cwd)
     except subprocess.CalledProcessError as exception:
         print(exception.output.decode(sys.stdout.encoding))
         print(f"Process failed with return code: {exception.returncode}")
@@ -115,7 +115,8 @@ def install_virtual_env_requirements(project_path: str, virtualenv_path: str):
         _process_exec(["uv", "pip", "install",
                        "-r", requirements_paths[0],
                        "-r", requirements_paths[1],
-                       "-r", requirements_paths[2]])
+                       "-r", requirements_paths[2]],
+                      cwd=project_path)
         with open(marker_path, "w") as marker_file:
             marker_file.write(requirements_hash)
 
@@ -126,7 +127,7 @@ def _activate_virtualenv(topdir):
     if os.environ.get("VIRTUAL_ENV") != virtualenv_path:
         if not os.path.exists(virtualenv_path):
             print(" * Setting up virtual environment...")
-            _process_exec(["uv", "venv"])
+            _process_exec(["uv", "venv"], cwd=topdir)
 
         script_dir = "Scripts" if _is_windows() else "bin"
         runpy.run_path(os.path.join(virtualenv_path, script_dir, 'activate_this.py'))