tests: add low-level SSH protocol tests
We don't really have good low-level tests for the behavior of the SSH
wire protocol. This commit attempts to establish some.
The added tests consist of a mixture of starting a server
with `hg serve --stdio` and sending bytes to it and using
`hg debugpeer` to go through the official client code. Having
insight into what raw bytes are exchanged as well as what the peer
does is useful.
We also introduce a test extension for modifying the behavior of
the SSH server and peer. For example, we change the server to
not recognize the "hello" command, simulating behavior of <0.9.1
servers.
These tests are generally useful to have. But the impetus for creating
them now is they will be needed for verifying behavior of old clients
and servers when a new SSH protocol is introduced.
Differential Revision: https://phab.mercurial-scm.org/D2026
# no-check-commit because of serve_forever()
from __future__ import absolute_import, print_function
import os
import sys
# make it runnable using python directly without run-tests.py
sys.path[0:0] = [os.path.join(os.path.dirname(__file__), '..')]
from hgext.lfs import pointer
def tryparse(text):
r = {}
try:
r = pointer.deserialize(text)
print('ok')
except Exception as ex:
print(ex)
if r:
text2 = r.serialize()
if text2 != text:
print('reconstructed text differs')
return r
t = ('version https://git-lfs.github.com/spec/v1\n'
'oid sha256:4d7a214614ab2935c943f9e0ff69d22eadbb8f32b1'
'258daaa5e2ca24d17e2393\n'
'size 12345\n'
'x-foo extra-information\n')
tryparse('')
tryparse(t)
tryparse(t.replace('git-lfs', 'unknown'))
tryparse(t.replace('v1\n', 'v1\n\n'))
tryparse(t.replace('sha256', 'ahs256'))
tryparse(t.replace('sha256:', ''))
tryparse(t.replace('12345', '0x12345'))
tryparse(t.replace('extra-information', 'extra\0information'))
tryparse(t.replace('extra-information', 'extra\ninformation'))
tryparse(t.replace('x-foo', 'x_foo'))
tryparse(t.replace('oid', 'blobid'))
tryparse(t.replace('size', 'size-bytes').replace('oid', 'object-id'))