gh-99367: Do not mangle sys.path[0] in pdb if safe_path is set (#111762)

Co-authored-by: Christian Walther <cwalther@users.noreply.github.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/Lib/pdb.py b/Lib/pdb.py
index ed78d74..9d12418 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -142,8 +142,10 @@ class _ScriptTarget(str):
             print('Error:', self.orig, 'is a directory')
             sys.exit(1)
 
-        # Replace pdb's dir with script's dir in front of module search path.
-        sys.path[0] = os.path.dirname(self)
+        # If safe_path(-P) is not set, sys.path[0] is the directory
+        # of pdb, and we should replace it with the directory of the script
+        if not sys.flags.safe_path:
+            sys.path[0] = os.path.dirname(self)
 
     @property
     def filename(self):