Verified: Caldera works on a hello_world with fresh machines

app/machinecontrol.py

@@ -404,7 +404,7 @@ class Machine():
         else:
             cleanupcmd = ""
 
-        cmd = f"cd {self.caldera_basedir}; {cleanupcmd}  git clone https://github.com/mitre/caldera.git --recursive --branch {version}; cd caldera; pip3 install -r requirements.txt"
+        cmd = f"cd {self.caldera_basedir}; {cleanupcmd} git clone https://github.com/mitre/caldera.git --recursive --branch {version}; cd caldera; git checkout {version}; pip3 install -r requirements.txt"
         self.attack_logger.vprint(f"{CommandlineColors.OKGREEN}Caldera server installed {CommandlineColors.ENDC}", 1)
         res = self.vm_manager.__call_remote_run__(cmd)
         return "Result installing caldera server " + str(res)