dockersetup: add uninstall option

Add the ability to uninstall the application for the user's convenience.
(Note that this does not undo the changes to the configuration, it only
removes the Docker containers and volumes.)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

dockersetup.py

@@ -44,6 +44,7 @@ def get_args():
 
     parser.add_argument('-u', '--update', action="store_true", default=False, help='Update existing installation instead of installing')
     parser.add_argument('-r', '--reinstall', action="store_true", default=False, help='Reinstall over existing installation (wipes database!)')
+    parser.add_argument('--uninstall', action="store_true", default=False, help='Uninstall (wipes database!)')
     parser.add_argument('-o', '--hostname', type=str, help='Hostname of your machine. Defaults to localhost if not set.', required=False, default = "localhost")
     parser.add_argument('-p', '--http-proxy', type=str, help='http proxy in the format http://<myproxy:port>', default=default_http_proxy, required=False)
     parser.add_argument('-s', '--https-proxy', type=str, help='https proxy in the format http://<myproxy:port>', default=default_https_proxy, required=False)
@@ -631,7 +632,11 @@ return_code = subprocess.call("docker ps -a | grep -q layersapp", shell=True)
 if return_code == 0:
     installed = True
 
-if args.update:
+if args.uninstall:
+    if not installed:
+        print("Cannot uninstall - application does not appear to be installed")
+        sys.exit(1)
+elif args.update:
     if not installed:
         print("Application container not found - update mode can only be used on an existing installation")
         sys.exit(1)
@@ -642,7 +647,8 @@ elif installed and not args.reinstall:
     print('Application already installed. Please use -u/--update to update or -r/--reinstall to reinstall')
     sys.exit(1)
 
-print("""
+if not args.uninstall:
+    print("""
 OE Layer Index Docker setup script
 ----------------------------------
 
@@ -657,7 +663,7 @@ Note that this script does have interactive prompts, so be prepared to
 provide information as needed.
 """)
 
-if not args.update and not email_host:
+if not (args.update or args.uninstall) and not email_host:
     print("""  WARNING: no email host has been specified - functions that require email
   (such as and new account registraion, password reset and error reports will
   not work without it. If you wish to correct this, press Ctrl+C now and then
@@ -670,8 +676,16 @@ if args.reinstall:
   want.
 """)
 
+if args.uninstall:
+    print("""
+  WARNING: continuing will wipe out any existing data in the database and
+  uninstall the application. Press Ctrl+C now if this is not what you want.
+""")
+
 try:
-    if args.update:
+    if args.uninstall:
+        promptstr = 'Press Enter to begin uninstallation (or Ctrl+C to exit)...'
+    elif args.update:
         promptstr = 'Press Enter to begin update (or Ctrl+C to exit)...'
     else:
         promptstr = 'Press Enter to begin setup (or Ctrl+C to exit)...'
@@ -680,7 +694,7 @@ except KeyboardInterrupt:
     print('')
     sys.exit(2)
 
-if not args.update:
+if not (args.update or args.uninstall):
     # Get email address
     print('')
     if args.letsencrypt:
@@ -695,9 +709,14 @@ if not args.update:
         else:
             print('Entered email address is not valid')
 
-if args.reinstall:
+if args.reinstall or args.uninstall:
     return_code = subprocess.call(['docker-compose', 'down', '-v'], shell=False)
 
+if args.uninstall:
+    # We're done
+    print('Uninstallation completed')
+    sys.exit(0)
+
 if args.update:
     args.no_https = read_dockerfile_web()
     if not args.no_https: