Initial attempt to confirm commands

dotbot/executor/commandrunner.py

@@ -17,6 +17,42 @@ class CommandRunner(Executor):
                 directive)
         return self._process_commands(data)
 
+# Modified, but source:
+# http://stackoverflow.com/questions/3041986/python-command-line-yes-no-input
+    def _query_yes_no(question, default="yes"):
+        """Ask a yes/no question via raw_input() and return their answer.
+
+        "question" is a string that is presented to the user.
+        "default" is the presumed answer if the user just hits <Enter>.
+            It must be "yes" (the default), "no" or None (meaning
+            an answer is required of the user).
+
+        The "answer" return value is True for "yes" or False for "no".
+        """
+        valid = {"yes": True, "y": True, "ye": True,
+                 "Yes": True, "No", False,
+                 "no": False, "n": False}
+        if default is None:
+            prompt = " [y/n] "
+        elif default in valid:
+            if valid[default] == True:
+                prompt = " [Y/n] "
+            elif valid[default] == False:
+                prompt = " [y/N] "
+        else:
+            raise ValueError("invalid default answer: '%s'" % default)
+
+        while True:
+            sys.stdout.write(question + prompt)
+            choice = raw_input().lower()
+            if default is not None and choice == '':
+                return valid[default]
+            elif choice in valid:
+                return valid[choice]
+            else:
+                sys.stdout.write("Please respond with 'yes' or 'no'.\n")
+
+
     def _process_commands(self, data):
         success = True
         with open(os.devnull, 'w') as devnull:
@@ -31,6 +67,8 @@ class CommandRunner(Executor):
                         stdout = None
                     if item.get('stderr', False) is True:
                         stderr = None
+                    if item.get('confirm', False) is True:
+                        confirm = True
                 elif isinstance(item, list):
                     cmd = item[0]
                     msg = item[1] if len(item) > 1 else None
@@ -41,8 +79,14 @@ class CommandRunner(Executor):
                     self._log.lowinfo(cmd)
                 else:
                     self._log.lowinfo('%s [%s]' % (msg, cmd))
-                ret = subprocess.call(cmd, shell=True, stdin=stdin, stdout=stdout,
-                    stderr=stderr, cwd=self._base_directory)
+                if confirm:
+                    run = self._query_yes_no('Do you want to run this command:'
+                            ' %s' % cmd)
+                else:
+                    run = True;
+                if run:
+                    ret = subprocess.call(cmd, shell=True, stdin=stdin,
+                        stdout=stdout, stderr=stderr, cwd=self._base_directory)
                     if ret != 0:
                         success = False
                         self._log.warning('Command [%s] failed' % cmd)