Ensure needed commands are installed

worker.py

@@ -11,7 +11,7 @@ import tracker
 
 from youtube_dl import YoutubeDL
 
-from shutil import rmtree
+from shutil import rmtree, which
 
 from queue import Queue
 
@@ -55,6 +55,8 @@ langs = ['ab', 'aa', 'af', 'sq', 'ase', 'am', 'ar', 'arc', 'hy', 'as', 'ay', 'az
     'tt', 'te', 'th', 'bo', 'ti', 'tpi', 'to', 'ts', 'tn', 'tr', 'tk', 'tw', 'uk', 'ur', 'uz', 'vi', 'vo', 'vor', 'cy', 'fy', 'wo', 
     'xh', 'yi', 'yo', 'zu']
 
+assert which("zip") and which("rsync") and which("curl"), "Please ensure the zip, rsync, and curl commands are installed on your system."
+
 #HSID, SSID, SID cookies required
 if "HSID" in environ.keys() and "SSID" in environ.keys() and "SID" in environ.keys():
     cookies = {"HSID": environ["HSID"], "SSID": environ["SSID"], "SID": environ["SID"]}