annotate tests/sshprotoext.py @ 48985:c75dae6e4ca7

rhg: sort unsupported extensions in error message This caused some flakiness in test output, and is also just better for users. Differential Revision: https://phab.mercurial-scm.org/D12389
author Raphaël Gomès <rgomes@octobus.net>
date Sat, 19 Mar 2022 15:44:38 +0100
parents 6000f5b25c9b
children 13c004b54cbe
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1 # sshprotoext.py - Extension to test behavior of SSH protocol
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2 #
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3 # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 # This extension replaces the SSH server started via `hg serve --stdio`.
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9 # The server behaves differently depending on environment variables.
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10
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11
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12 from mercurial import (
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13 error,
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14 extensions,
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15 registrar,
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16 sshpeer,
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17 wireprotoserver,
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18 wireprotov1server,
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19 )
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20
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21 configtable = {}
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22 configitem = registrar.configitem(configtable)
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23
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24 configitem(b'sshpeer', b'mode', default=None)
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25 configitem(b'sshpeer', b'handshake-mode', default=None)
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26
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27
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28 class bannerserver(wireprotoserver.sshserver):
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29 """Server that sends a banner to stdout."""
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30
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31 def serve_forever(self):
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32 for i in range(10):
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33 self._fout.write(b'banner: line %d\n' % i)
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34
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35 super(bannerserver, self).serve_forever()
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36
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37
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38 class prehelloserver(wireprotoserver.sshserver):
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39 """Tests behavior when connecting to <0.9.1 servers.
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40
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41 The ``hello`` wire protocol command was introduced in Mercurial
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42 0.9.1. Modern clients send the ``hello`` command when connecting
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43 to SSH servers. This mock server tests behavior of the handshake
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44 when ``hello`` is not supported.
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45 """
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46
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47 def serve_forever(self):
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48 l = self._fin.readline()
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49 assert l == b'hello\n'
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50 # Respond to unknown commands with an empty reply.
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51 wireprotoserver._sshv1respondbytes(self._fout, b'')
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52 l = self._fin.readline()
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53 assert l == b'between\n'
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54 proto = wireprotoserver.sshv1protocolhandler(
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55 self._ui, self._fin, self._fout
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56 )
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57 rsp = wireprotov1server.dispatch(self._repo, proto, b'between')
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58 wireprotoserver._sshv1respondbytes(self._fout, rsp.data)
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59
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60 super(prehelloserver, self).serve_forever()
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61
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62
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63 def performhandshake(orig, ui, stdin, stdout, stderr):
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64 """Wrapped version of sshpeer._performhandshake to send extra commands."""
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65 mode = ui.config(b'sshpeer', b'handshake-mode')
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66 if mode == b'pre-no-args':
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67 ui.debug(b'sending no-args command\n')
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68 stdin.write(b'no-args\n')
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69 stdin.flush()
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70 return orig(ui, stdin, stdout, stderr)
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71 elif mode == b'pre-multiple-no-args':
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72 ui.debug(b'sending unknown1 command\n')
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73 stdin.write(b'unknown1\n')
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74 ui.debug(b'sending unknown2 command\n')
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75 stdin.write(b'unknown2\n')
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76 ui.debug(b'sending unknown3 command\n')
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77 stdin.write(b'unknown3\n')
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78 stdin.flush()
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79 return orig(ui, stdin, stdout, stderr)
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80 else:
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81 raise error.ProgrammingError(b'unknown HANDSHAKECOMMANDMODE: %s' % mode)
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82
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83
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84 def extsetup(ui):
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85 # It's easier for tests to define the server behavior via environment
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86 # variables than config options. This is because `hg serve --stdio`
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87 # has to be invoked with a certain form for security reasons and
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88 # `dummyssh` can't just add `--config` flags to the command line.
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89 servermode = ui.environ.get(b'SSHSERVERMODE')
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90
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91 if servermode == b'banner':
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92 wireprotoserver.sshserver = bannerserver
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93 elif servermode == b'no-hello':
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94 wireprotoserver.sshserver = prehelloserver
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95 elif servermode:
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96 raise error.ProgrammingError(b'unknown server mode: %s' % servermode)
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97
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98 peermode = ui.config(b'sshpeer', b'mode')
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99
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100 if peermode == b'extra-handshake-commands':
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101 extensions.wrapfunction(sshpeer, '_performhandshake', performhandshake)
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102 elif peermode:
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103 raise error.ProgrammingError(b'unknown peer mode: %s' % peermode)