Update launch_utils.py to fix wrong dep. checks and reinstalls

Fixes failing dependency checks for extensions having a different package name and import name (for example ffmpeg-python / ffmpeg), which currently is causing the unneeded reinstall of packages at runtime.

In fact with current code, the same string is used when installing a package and when checking for its presence, as you can see in the following example:

> launch_utils.run_pip("install ffmpeg-python", "required package")
[ Installing required package: "ffmpeg-python" ... ]
[ Installed ]

> launch_utils.is_installed("ffmpeg-python")
False

... which would actually return true with:

> launch_utils.is_installed("ffmpeg")
True

1 files changed, 10 insertions, 4 deletions

diff --git a/modules/launch_utils.py b/modules/launch_utils.py
index 6e54d063..6664c5e0 100644
--- a/modules/launch_utils.py
+++ b/modules/launch_utils.py
@@ -6,6 +6,7 @@ import os
 import shutil

 import sys

 import importlib.util

+import importlib.metadata

 import platform

 import json

 from functools import lru_cache

@@ -119,11 +120,16 @@ def run(command, desc=None, errdesc=None, custom_env=None, live: bool = default_
 

 def is_installed(package):

     try:

-        spec = importlib.util.find_spec(package)

-    except ModuleNotFoundError:

-        return False

+    	dist = importlib.metadata.distribution(package)

+    except importlib.metadata.PackageNotFoundError:

+        try: 

+            spec = importlib.util.find_spec(package)

+        except ModuleNotFoundError:

+    	    return False

 

-    return spec is not None

+        return spec is not None

+

+    return dist is not None

 

 

 def repo_dir(name):