Avoid assuming there’s a PATH variable defined

This is helpful in restricted environments, and this is the only place where `mx --version` breaks at the moment. Signed-off-by: Stefan Marr <[email protected]>
graalvm · May 3, 2024 · 9fcffdd · 9fcffdd
1 parent 6caac1b
commit 9fcffdd
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/mx/_impl/mx_proftool.py b/src/mx/_impl/mx_proftool.py
@@ -921,6 +921,9 @@ def demangled_name(self, short_class_names: bool = False):
 
 
 def _which(executable):
+    if 'PATH' not in os.environ:
+        return None
+
     for path in os.environ['PATH'].split(os.pathsep):
         f = os.path.join(path.strip('"'), executable)
         if os.path.isfile(f) and os.access(f, os.X_OK):