Mercurial > hg-git-serve

annotate src/hgext3rd/hggit_serve/_http.py @ 14:959ef686193f

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Add user-facing documentation.
author Paul Fisher <paul@pfish.zone>
date Fri, 20 Feb 2026 21:05:31 -0500
parents 00bdfac5416c
children
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1 from __future__ import annotations
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2
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3 import email.parser
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4 import email.policy
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5 import re
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6 import shutil
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7 import subprocess
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8 import typing as t
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9
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10 from mercurial import extensions
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11 from mercurial import wireprotoserver
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12 from mercurial.thirdparty import attr
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14 from . import _export as xp
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15
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16 if t.TYPE_CHECKING:
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17 import mercurial.hgweb.hgweb_mod_inner as web_inner
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18 import mercurial.hgweb.request as hgreq
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19 import mercurial.ui as hgui
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20
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21 PermissionCheck = t.Callable[
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22 [web_inner.requestcontext, hgreq.parsedrequest, bytes],
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23 None,
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24 ]
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27 _CGI_VAR = re.compile(rb'[A-Z0-9_]+$')
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28 """Environment variables that we need to pass to git-as-cgi."""
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31 def _build_git_environ(
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32 req_ctx: web_inner.requestcontext,
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33 request: hgreq.parsedrequest,
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34 ) -> dict[bytes, bytes]:
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35 """Builds the environment to be sent to Git to serve HTTP."""
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36 fixed = {
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37 k: v
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38 for (k, v) in request.rawenv.items()
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39 if isinstance(v, bytes) and _CGI_VAR.match(k)
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40 }
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41 repo = req_ctx.repo
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42 assert xp.is_gitty(repo)
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43 fixed.update(
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44 {
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45 b'GIT_HTTP_EXPORT_ALL': b'yes',
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46 b'GIT_PROJECT_ROOT': repo.githandler.gitdir,
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47 b'PATH_INFO': b'/' + request.dispatchpath,
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48 # Since Mercurial is taking care of authorization checking,
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49 # we tell Git to always allow push.
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50 b'GIT_CONFIG_COUNT': b'1',
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51 b'GIT_CONFIG_KEY_0': b'http.receivepack',
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52 b'GIT_CONFIG_VALUE_0': b'true',
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53 }
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54 )
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55 return fixed
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57
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58 def _parse_cgi_response(
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59 output: t.IO[bytes],
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60 ) -> tuple[bytes, dict[bytes, bytes], t.IO[bytes]]:
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61 """Parses a CGI response into a status, headers, and everyhting else."""
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62 parser = email.parser.BytesFeedParser(policy=email.policy.HTTP)
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63 while line := output.readline():
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64 if not line.rstrip(b'\r\n'):
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65 # We've reached the end of the headers.
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66 # Leave the rest in the output for later.
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67 break
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68 parser.feed(line)
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69 msg = parser.close()
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70 status = msg.get('Status', '200 OK I guess').encode('utf-8')
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71 del msg['Status'] # this won't raise an exception
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72 byte_headers = {
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73 k.encode('utf-8'): v.encode('utf-8') for (k, v) in msg.items()
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74 }
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75 return status, byte_headers, output
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77
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78 def _git_service_permission(request: hgreq.parsedrequest) -> bytes | None:
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79 """Figures out what Mercurial permission corresponds to a request from Git.
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80
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81 If the request is a supported Git action, returns the permission it needs.
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82 If the request is not a Git action, returns None.
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83 """
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84 if perm := xp.SERVICE_PERMISSIONS.get(request.dispatchpath):
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85 return perm
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86 if request.dispatchpath != b'info/refs':
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87 return None
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88 qs = request.querystring
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89 service = qs.removeprefix(b'service=')
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90 if qs == service:
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91 # Nothing was stripped.
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92 return None
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93 return xp.SERVICE_PERMISSIONS.get(service)
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95
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96 def _handle_git_protocol(
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97 original: t.Callable[..., bool],
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98 req_ctx: web_inner.requestcontext,
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99 request: hgreq.parsedrequest,
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100 response: hgreq.wsgiresponse,
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101 check_permission: PermissionCheck,
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102 ) -> bool:
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103 """Intercepts requests from Git, if needed."""
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104 perm = _git_service_permission(request)
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105 repo = req_ctx.repo
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106 if not perm or not xp.is_gitty(repo):
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107 # We only handle Git requests to Gitty repos.
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108 return original(req_ctx, request, response, check_permission)
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109
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110 # Permission workaround: Mercurial requires POSTs for push,
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111 # but the advertisement request from Git will be a GET.
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112 # We just lie to Mercurial about what we're doing.
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113 check_permission(
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114 req_ctx,
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115 (
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116 attr.evolve(req_ctx.req, method=b'POST')
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117 if perm == xp.PUSH
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118 else req_ctx.req
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119 ),
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120 perm,
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121 )
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122 cgi_env = _build_git_environ(req_ctx, request)
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123 http_backend = repo.ui.configlist(
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124 b'hggit-serve', b'http-backend', default=(b'git', b'http-backend')
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125 )
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126 call = subprocess.Popen(
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127 http_backend,
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128 close_fds=True,
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129 stdin=subprocess.PIPE,
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130 stdout=subprocess.PIPE,
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131 stderr=subprocess.DEVNULL,
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132 env=cgi_env,
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133 text=False,
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134 )
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135 assert call.stdout
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136 assert call.stdin
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137 # Git will not start writing output until stdin is fully closed.
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138 with call.stdin:
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139 # This is how we know if there's anything to read from bodyfh.
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140 # If we try to read from bodyfh on a request with no content,
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141 # it hangs forever.
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142 if b'CONTENT_LENGTH' in request.rawenv:
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143 shutil.copyfileobj(request.bodyfh, call.stdin)
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144
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145 status, headers, rest = _parse_cgi_response(call.stdout)
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146 response.status = status
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147 for k, v in headers.items():
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148 response.headers[k] = v
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149
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150 def write_the_rest() -> t.Iterator[bytes]:
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151 with call, rest:
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152 # if it's good enough for shutil it's good enough for me
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153 # technically not in the docs but everybody it
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154 bs = shutil.COPY_BUFSIZE # type: ignore[attr-defined]
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155 while more := rest.read(bs):
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156 yield more
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157 if perm == xp.PUSH:
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158 # If we pushed, we need to import any new refs back into Mercurial.
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159 xp.import_all(repo, b'git-http-push')
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160
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161 response.setbodygen(write_the_rest())
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162 response.sendresponse()
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163 return True
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164
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165
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166 #
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167 # Interfacing with Mercurial
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168 #
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169
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170
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171 def uisetup(_: hgui.ui) -> None:
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172 extensions.wrapfunction(
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173 wireprotoserver, 'handlewsgirequest', _handle_git_protocol
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174 )