patch sbdmock shell command

diff --git a/scripts/sbdmock b/scripts/sbdmock
index 5ce3c72..5b98980 100755
--- a/scripts/sbdmock
+++ b/scripts/sbdmock
@@ -301,6 +301,13 @@ class SBBuilder:
         return (retval, output)


+    def shell(self, args):
+        """execute a shell command in scratchbox target"""
+        
+        self.state("shell")
+        
+        self.do_chroot_ng(' '.join(args))
+
     def build(self, dsc):
         """build an source package into binary debs, capture log"""

@@ -696,7 +703,7 @@ class SBBuilder:
         # We will only read from pipe
         pipe.tochild.close()

-        if self.state() == "build":
+        if self.state() == "build" or self.state() == "shell":
             logfile = self._build_log
         else:
             logfile = self._root_log
@@ -895,6 +902,7 @@ def command_parse():

     usage = """
     usage: sbdmock [options] /path/to/dsc
+    usage: sbdmock [options] -c shell command with arguments
     optional commands:
         clean - clean out the specified chroot
         init - initialize the chroot, do not build anything"""
@@ -930,6 +938,8 @@ def command_parse():
             help="Modifiers for DEB_BUILD_OPTIONS (e.g. '+debug,-parallel')")
     parser.add_option("--define", action="append", type="string", default=None,
             help="Define variables which might be used in other variables. Format: name=value")
+    parser.add_option("-c", action="store_true", dest="command", default=False,
+            help="Interpret arguments as a shell command to execute in the scratchbox")

     return parser.parse_args()

@@ -1083,7 +1093,35 @@ def main():

     my = None
     # do whatever we're here to do
-    if args[0] == 'clean':
+    if options.command:
+        # execute a shell command
+        if options.genext and not config_opts['uniqueext']:
+            def gen_uniqid(dsc, target):
+                import sha
+                hash_string = "%d%s%s" % (os.getpid(), target, dsc)
+                sha_hash = sha.new()
+                sha_hash.update(hash_string)
+                return sha_hash.hexdigest()
+            config_opts['uniqueext'] = gen_uniqid(args[0], options.target)
+            config_opts['uniqueext-auto'] = True
+        
+        start_time = time.time()
+        try:
+            my = SBBuilder(config_opts)
+            my.prep()
+            my.shell(args)
+        except Error, err:
+            error("Error occured: %s" % err.msg)
+            if my:
+                my.close()
+            sys.exit(err.resultcode)
+        
+        my.close()
+        stop_time = time.time()
+        print "Elapsed time %s" % time.strftime("%T", time.gmtime(stop_time-start_time))
+        print "Logs in: %s" % my.resultdir
+
+    elif args[0] == 'clean':
         # unset a --no-clean
         config_opts['clean'] = True
         try: