Make using kitty askpass optional

kittens/ssh/options/definition.py

@@ -107,4 +107,11 @@ opt('login_shell', '', long_text='''
 The login shell to execute on the remote host. By default, the remote user account's
 login shell is used.''')
 
+opt('askpass', 'unless-set', long_text='''
+Control the program SSH uses to ask for passwords or confirmation of host keys etc.
+The default is to use kitty's native askpass, unless the SSH_ASKPASS environment variable
+is set. Set it to :code:`ssh` to not interfere with the normal ssh askpass mechanism at all,
+which typically means that ssh will prompt at the terminal. Set it to :code:`native` to always use
+kitty's native, built-in askpass implementation.
+''')
 egr()  # }}}

kittens/ssh/options/parse.py

@@ -7,6 +7,9 @@ from kitty.conf.utils import merge_dicts, to_bool
 
 class Parser:
 
+    def askpass(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
+        ans['askpass'] = str(val)
+
     def copy(self, val: str, ans: typing.Dict[str, typing.Any]) -> None:
         for k, v in copy(val, ans["copy"]):
             ans["copy"][k] = v

kittens/ssh/options/types.py

@@ -5,6 +5,7 @@ import kittens.ssh.copy
 
 
 option_names = (  # {{{
+ 'askpass',
  'copy',
  'cwd',
  'env',
@@ -17,6 +18,7 @@ option_names = (  # {{{
 
 
 class Options:
+    askpass: str = 'unless-set'
     cwd: str = ''
     hostname: str = '*'
     interpreter: str = 'sh'