fix: work with pip in venv

heroku/modules/loader.py

@@ -15,9 +15,9 @@
 import ast
 import asyncio
 import contextlib
+import difflib
 import functools
 import importlib
-import difflib
 import inspect
 import io
 import logging
@@ -33,10 +33,10 @@ from importlib.machinery import ModuleSpec
 from urllib.parse import urlparse
 
 import requests
+from herokutl.errors.common import ScamDetectionError
 from herokutl.errors.rpcerrorlist import MediaCaptionTooLongError
 from herokutl.tl.functions.channels import JoinChannelRequest
 from herokutl.tl.types import Channel, Message, PeerUser
-from herokutl.errors.common import ScamDetectionError
 
 from .. import loader, main, utils
 from .._local_storage import RemoteStorage
@@ -662,6 +662,9 @@ class LoaderMod(loader.Module):
                         ),
                     )
 
+                is_venv = hasattr(sys, 'real_prefix') or sys.prefix != getattr(sys, 'base_prefix', sys.prefix)
+                need_user_flag = loader.USER_INSTALL and not is_venv
+
                 pip = await asyncio.create_subprocess_exec(
                     sys.executable,
                     "-m",
@@ -671,7 +674,7 @@ class LoaderMod(loader.Module):
                     "-q",
                     "--disable-pip-version-check",
                     "--no-warn-script-location",
-                    *["--user"] if loader.USER_INSTALL else [],
+                    *["--user"] if need_user_flag else [],
                     *requirements,
                 )