Mercurial > hg
view contrib/genosxversion.py @ 37557:734515aca84d
wireproto: define and implement HTTP handshake to upgrade protocol
When clients connect to repositories over HTTP, they issue a request
to the well-known URL "?cmd=capabilities" to fetch the repository
capabilities. This is the handshake portion of the HTTP protocol.
This commit defines a mechanism to use that HTTP request to return
information about modern server features.
If a client sends an X-HgUpgrade-* header containing a list of
client-supported API names, the server responds with a response
containing information about available services. This includes
the normal capabilities string. So if the server doesn't support
any newer services, the client can easily fall back.
By advertising supported services from clients, server operators
can see and log what client support exists in the wild. This will
also help with debugging.
The response contains the base path to API services. We know there
are potential issues with the <repo>/api/ URL space conflicting with
hgwebdir and subrepos. By making the API URL dynamic from the
perspective of the client, the URL for APIs is not subject to backwards
compatibility concerns - at least as long as a ?cmd=capabilities request
is made.
We've also defined the ``cbor`` client capability for the X-HgProto-*
header. This MUST be sent in order to get the modern response from
"?cmd=capabilities". During implementation, I initially always sent
an application/mercurial-cbor response. However, the handshake
mechanism will be more future compatible if the client is in charge
of which formats to request. We already perform content negotiation
from X-HgProto-*, so keying off this for the capabilities response
feels appropriate.
In addition, I initially used application/cbor. However, it is
conceivable that a non-Mercurial server could serve application/cbor.
To rule out this possibility, I've invented a new media type that
is Mercurial specific and can't be confused for generic CBOR.
Differential Revision: https://phab.mercurial-scm.org/D3242
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Tue, 10 Apr 2018 14:29:15 -0700 |
parents | 283a7da602ae |
children | 25880ddf9a86 |
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#!/usr/bin/env python2 from __future__ import absolute_import, print_function import argparse import json import os import subprocess import sys # Always load hg libraries from the hg we can find on $PATH. hglib = json.loads(subprocess.check_output( ['hg', 'debuginstall', '-Tjson']))[0]['hgmodules'] sys.path.insert(0, os.path.dirname(hglib)) from mercurial import util ap = argparse.ArgumentParser() ap.add_argument('--paranoid', action='store_true', help=("Be paranoid about how version numbers compare and " "produce something that's more likely to sort " "reasonably.")) ap.add_argument('--selftest', action='store_true', help='Run self-tests.') ap.add_argument('versionfile', help='Path to a valid mercurial __version__.py') def paranoidver(ver): """Given an hg version produce something that distutils can sort. Some Mac package management systems use distutils code in order to figure out upgrades, which makes life difficult. The test case is a reduced version of code in the Munki tool used by some large organizations to centrally manage OS X packages, which is what inspired this kludge. >>> paranoidver('3.4') '3.4.0' >>> paranoidver('3.4.2') '3.4.2' >>> paranoidver('3.0-rc+10') '2.9.9999-rc+10' >>> paranoidver('4.2+483-5d44d7d4076e') '4.2.0+483-5d44d7d4076e' >>> paranoidver('4.2.1+598-48d1e1214d8c') '4.2.1+598-48d1e1214d8c' >>> paranoidver('4.3-rc') '4.2.9999-rc' >>> paranoidver('4.3') '4.3.0' >>> from distutils import version >>> class LossyPaddedVersion(version.LooseVersion): ... '''Subclass version.LooseVersion to compare things like ... "10.6" and "10.6.0" as equal''' ... def __init__(self, s): ... self.parse(s) ... ... def _pad(self, version_list, max_length): ... 'Pad a version list by adding extra 0 components to the end' ... # copy the version_list so we don't modify it ... cmp_list = list(version_list) ... while len(cmp_list) < max_length: ... cmp_list.append(0) ... return cmp_list ... ... def __cmp__(self, other): ... if isinstance(other, str): ... other = MunkiLooseVersion(other) ... max_length = max(len(self.version), len(other.version)) ... self_cmp_version = self._pad(self.version, max_length) ... other_cmp_version = self._pad(other.version, max_length) ... return cmp(self_cmp_version, other_cmp_version) >>> def testver(older, newer): ... o = LossyPaddedVersion(paranoidver(older)) ... n = LossyPaddedVersion(paranoidver(newer)) ... return o < n >>> testver('3.4', '3.5') True >>> testver('3.4.0', '3.5-rc') True >>> testver('3.4-rc', '3.5') True >>> testver('3.4-rc+10-deadbeef', '3.5') True >>> testver('3.4.2', '3.5-rc') True >>> testver('3.4.2', '3.5-rc+10-deadbeef') True >>> testver('4.2+483-5d44d7d4076e', '4.2.1+598-48d1e1214d8c') True >>> testver('4.3-rc', '4.3') True >>> testver('4.3', '4.3-rc') False """ major, minor, micro, extra = util.versiontuple(ver, n=4) if micro is None: micro = 0 if extra: if extra.startswith('rc'): if minor == 0: major -= 1 minor = 9 else: minor -= 1 micro = 9999 extra = '-' + extra else: extra = '+' + extra else: extra = '' return '%d.%d.%d%s' % (major, minor, micro, extra) def main(argv): opts = ap.parse_args(argv[1:]) if opts.selftest: import doctest doctest.testmod() return with open(opts.versionfile) as f: for l in f: if l.startswith('version = '): # version number is entire line minus the quotes ver = l[len('version = ') + 1:-2] break if opts.paranoid: print(paranoidver(ver)) else: print(ver) if __name__ == '__main__': main(sys.argv)