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install: Raise an error to avoid breaking python-exec
Running pip without --target, --root, or --user will result in packages
being installed systemwide. This has a tendency to break python-exec if
setuptools gets installed or upgraded.
--- pip-19.1/src/pip/_internal/commands/install.py
+++ pip-19.1/src/pip/_internal/commands/install.py
@@ -246,6 +246,9 @@ class InstallCommand(RequirementCommand):
if options.upgrade:
upgrade_strategy = options.upgrade_strategy
+ if not any((options.use_user_site, options.target_dir, options.root_path, options.prefix_path)):
+ raise CommandError("(Gentoo) Please run pip with the --user option to avoid breaking python-exec")
+
if options.build_dir:
options.build_dir = os.path.abspath(options.build_dir)
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