Merge pull request #12089 from JasonMo1/main

Author: uranusjr

news/11920.bugfix.rst

@@ -0,0 +1 @@
+Add permission check before configuration

src/pip/_internal/configuration.py

@@ -210,8 +210,15 @@ def save(self) -> None:
             # Ensure directory exists.
             ensure_dir(os.path.dirname(fname))
 
-            with open(fname, "w") as f:
-                parser.write(f)
+            # Ensure directory's permission(need to be writeable)
+            try:
+                with open(fname, "w") as f:
+                    parser.write(f)
+            except OSError as error:
+                raise ConfigurationError(
+                    f"An error occurred while writing to the configuration file "
+                    f"{fname}: {error}"
+                )
 
     #
     # Private routines