fixed chmod permission issue

Author: RohanBhirangi

README.md

@@ -1,6 +1,5 @@
 import os
 import sys
-import shlex
 import subprocess
 import argparse
 import time
@@ -25,15 +24,15 @@ def supply_chain():
   os.chdir("owner_alice")
   create_layout_cmd = "python create_layout.py"
   print create_layout_cmd
-  subprocess.call(shlex.split(create_layout_cmd))
+  subprocess.call(create_layout_cmd.split())
 
   prompt_key("Clone source code (Bob)")
   os.chdir("../functionary_bob")
   clone_cmd = ("in-toto-run"
                     " --step-name clone --products demo-project/foo.py"
                     " --key bob -- git clone https://github.com/in-toto/demo-project.git")
   print clone_cmd
-  subprocess.call(shlex.split(clone_cmd))
+  subprocess.call(clone_cmd.split())
 
   prompt_key("Update version number (Bob)")
   update_version_start_cmd = ("in-toto-record"
@@ -43,7 +42,7 @@ def supply_chain():
                     " --materials demo-project/foo.py")
 
   print update_version_start_cmd
-  subprocess.call(shlex.split(update_version_start_cmd))
+  subprocess.call(update_version_start_cmd.split())
 
   update_version = "echo 'VERSION = \"foo-v1\"\n\nprint(\"Hello in-toto\")\n' > demo-project/foo.py"
   print update_version
@@ -56,7 +55,7 @@ def supply_chain():
                     " --products demo-project/foo.py")
 
   print update_version_stop_cmd
-  subprocess.call(shlex.split(update_version_stop_cmd))
+  subprocess.call(update_version_stop_cmd.split())
 
   copytree("demo-project", "../functionary_carl/demo-project")
 
@@ -68,7 +67,7 @@ def supply_chain():
                  " --key carl --record-byproducts"
                  " -- tar --exclude '.git' -zcvf demo-project.tar.gz demo-project")
   print package_cmd
-  subprocess.call(shlex.split(package_cmd))
+  subprocess.call(package_cmd.split())
 
 
   prompt_key("Create final product")
@@ -87,7 +86,7 @@ def supply_chain():
                 " --layout root.layout"
                 " --layout-key alice.pub")
   print verify_cmd
-  retval = subprocess.call(shlex.split(verify_cmd))
+  retval = subprocess.call(verify_cmd.split())
   print "Return value: " + str(retval)
 
 
@@ -108,7 +107,7 @@ def supply_chain():
                  " --key carl --record-byproducts"
                  " -- tar --exclude '.git' -zcvf demo-project.tar.gz demo-project")
   print package_cmd
-  subprocess.call(shlex.split(package_cmd))
+  subprocess.call(package_cmd.split())
 
 
   prompt_key("Create final product")
@@ -128,7 +127,7 @@ def supply_chain():
                 " --layout-key alice.pub")
 
   print verify_cmd
-  retval = subprocess.call(shlex.split(verify_cmd))
+  retval = subprocess.call(verify_cmd.split())
   print "Return value: " + str(retval)