prsync: support downloading

fixes #120

bin/prsync

@@ -36,6 +36,8 @@ def option_parser():
             help='use rsync compression (OPTIONAL)')
     parser.add_option('-S', '--ssh-args', metavar="ARGS", dest='ssh_args',
             action='store', help='extra arguments for ssh')
+    parser.add_option('-d', '--download', dest='download', action='store_true',
+            help='download files instead, reversing local and remote (OPTIONAL)')
 
     return parser
 
@@ -83,11 +85,22 @@ def do_prsync(hosts, local, remote, opts):
             cmd.append('-z')
         if opts.extra:
             cmd.extend(opts.extra)
-        cmd.extend(local)
-        if user:
-            cmd.append('%s@%s:%s' % (user, host, remote))
+        if opts.download:
+            if len(local) != 1:
+                sys.exit('can only download one target at a time')
+            if user:
+                cmd.append('%s@%s:%s' % (user, host, local[0]))
+            else:
+                cmd.append('%s:%s' % (host, local[0]))
+            localpath = "%s/%s" % (remote, host)
+            os.makedirs(localpath)
+            cmd.append(localpath)
         else:
-            cmd.append('%s:%s' % (host, remote))
+            cmd.extend(local)
+            if user:
+                cmd.append('%s@%s:%s' % (user, host, remote))
+            else:
+                cmd.append('%s:%s' % (host, remote))
         t = Task(host, port, user, cmd, opts)
         manager.add_task(t)
     try: