Safer way to detect python package version

modoboa_installer/python.py

@@ -58,18 +58,25 @@ def get_package_version(name, venv=None, **kwargs):
                     f"Output is: {output}")
         sys.exit(1)
 
-    output_list = output.decode().split("\n")
-    version_item_list = output_list[1].split(":")
-    version_list = version_item_list[1].split(".")
     version_list_clean = []
-    for element in version_list:
-        try:
-            version_list_clean.append(int(element))
-        except ValueError:
-            utils.printcolor(
-                f"Failed to decode some part of the version of {name}",
-                utils.YELLOW)
-            version_list_clean.append(element)
+    for line in output.decode().split("\n"):
+        if not line.startswith("Version:"):
+            continue
+        version_item_list = line.split(":")
+        version_list = version_item_list[1].split(".")
+        for element in version_list:
+            try:
+                version_list_clean.append(int(element))
+            except ValueError:
+                utils.printcolor(
+                    f"Failed to decode some part of the version of {name}",
+                    utils.YELLOW)
+                version_list_clean.append(element)
+    if len(version_list_clean) == 0:
+        utils.printcolor(
+            f"Failed to find the version of {name}",
+            utils.RED)
+        sys.exit(1)
     return version_list_clean