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Index: src/__phutil_library_map__.php
===================================================================
--- src/__phutil_library_map__.php
+++ src/__phutil_library_map__.php
@@ -505,6 +505,8 @@
'DiffusionMercurialFileContentQuery' => 'applications/diffusion/query/filecontent/DiffusionMercurialFileContentQuery.php',
'DiffusionMercurialRawDiffQuery' => 'applications/diffusion/query/rawdiff/DiffusionMercurialRawDiffQuery.php',
'DiffusionMercurialRequest' => 'applications/diffusion/request/DiffusionMercurialRequest.php',
+ 'DiffusionMercurialResponse' => 'applications/diffusion/response/DiffusionMercurialResponse.php',
+ 'DiffusionMercurialWireProtocol' => 'applications/diffusion/protocol/DiffusionMercurialWireProtocol.php',
'DiffusionPathChange' => 'applications/diffusion/data/DiffusionPathChange.php',
'DiffusionPathChangeQuery' => 'applications/diffusion/query/pathchange/DiffusionPathChangeQuery.php',
'DiffusionPathCompleteController' => 'applications/diffusion/controller/DiffusionPathCompleteController.php',
@@ -2757,6 +2759,7 @@
'DiffusionMercurialFileContentQuery' => 'DiffusionFileContentQuery',
'DiffusionMercurialRawDiffQuery' => 'DiffusionRawDiffQuery',
'DiffusionMercurialRequest' => 'DiffusionRequest',
+ 'DiffusionMercurialResponse' => 'AphrontResponse',
'DiffusionPathCompleteController' => 'DiffusionController',
'DiffusionPathQueryTestCase' => 'PhabricatorTestCase',
'DiffusionPathValidateController' => 'DiffusionController',
Index: src/applications/diffusion/controller/DiffusionServeController.php
===================================================================
--- src/applications/diffusion/controller/DiffusionServeController.php
+++ src/applications/diffusion/controller/DiffusionServeController.php
@@ -176,6 +176,9 @@
case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
$result = $this->serveGitRequest($repository, $viewer);
break;
+ case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
+ $result = $this->serveMercurialRequest($repository, $viewer);
+ break;
default:
$result = new PhabricatorVCSResponse(
999,
@@ -224,13 +227,43 @@
break;
case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
$cmd = $request->getStr('cmd');
- switch ($cmd) {
- case 'capabilities':
+ if ($cmd == 'batch') {
+ // For "batch" we get a "cmds" argument like
+ //
+ // heads ;known nodes=
+ //
+ // We need to examine the commands (here, "heads" and "known") to
+ // make sure they're all read-only.
+
+ $args = $this->getMercurialArguments();
+ $cmds = idx($args, 'cmds');
+ if ($cmds) {
+
+ // NOTE: Mercurial has some code to escape semicolons, but it does
+ // not actually function for command separation. For example, these
+ // two batch commands will produce completely different results (the
+ // former will run the lookup; the latter will fail with a parser
+ // error):
+ //
+ // lookup key=a:xb;lookup key=z* 0
+ // lookup key=a:;b;lookup key=z* 0
+ // ^
+ // |
+ // +-- Note semicolon.
+ //
+ // So just split unconditionally.
+
+ $cmds = explode(';', $cmds);
+ foreach ($cmds as $sub_cmd) {
+ $name = head(explode(' ', $sub_cmd, 2));
+ if (!DiffusionMercurialWireProtocol::isReadOnlyCommand($name)) {
+ return false;
+ }
+ }
return true;
- default:
- return false;
+ }
}
- break;
+ return DiffusionMercurialWireProtocol::isReadOnlyCommand($cmd);
case PhabricatorRepositoryType::REPOSITORY_TYPE_SUBVERSION:
break;
}
@@ -357,5 +390,127 @@
return $user;
}
+
+ private function serveMercurialRequest(PhabricatorRepository $repository) {
+ $request = $this->getRequest();
+
+ $bin = Filesystem::resolveBinary('hg');
+ if (!$bin) {
+ throw new Exception("Unable to find `hg` in PATH!");
+ }
+
+ $env = array();
+ $input = PhabricatorStartup::getRawInput();
+
+ $cmd = $request->getStr('cmd');
+
+ $args = $this->getMercurialArguments();
+ $args = $this->formatMercurialArguments($cmd, $args);
+
+ if (strlen($input)) {
+ $input = strlen($input)."\n".$input."0\n";
+ }
+
+ list($err, $stdout, $stderr) = id(new ExecFuture('%s serve --stdio', $bin))
+ ->setEnv($env, true)
+ ->setCWD($repository->getLocalPath())
+ ->write("{$cmd}\n{$args}{$input}")
+ ->resolve();
+
+ if ($err) {
+ return new PhabricatorVCSResponse(
+ 500,
+ pht('Error %d: %s', $err, $stderr));
+ }
+
+ if ($cmd == 'getbundle' ||
+ $cmd == 'changegroup' ||
+ $cmd == 'changegroupsubset') {
+ // We're not completely sure that "changegroup" and "changegroupsubset"
+ // actually work, they're for very old Mercurial.
+ $body = gzcompress($stdout);
+ } else if ($cmd == 'unbundle') {
+ // This includes diagnostic information and anything echoed by commit
+ // hooks. We ignore `stdout` since it just has protocol garbage, and
+ // substitute `stderr`.
+ $body = strlen($stderr)."\n".$stderr;
+ } else {
+ list($length, $body) = explode("\n", $stdout, 2);
+ }
+
+ return id(new DiffusionMercurialResponse())->setContent($body);
+ }
+
+
+ private function getMercurialArguments() {
+ // Mercurial sends arguments in HTTP headers. "Why?", you might wonder,
+ // "Why would you do this?".
+
+ $args_raw = array();
+ for ($ii = 1; ; $ii++) {
+ $header = 'HTTP_X_HGARG_'.$ii;
+ if (!array_key_exists($header, $_SERVER)) {
+ break;
+ }
+ $args_raw[] = $_SERVER[$header];
+ }
+ $args_raw = implode('', $args_raw);
+
+ return id(new PhutilQueryStringParser())
+ ->parseQueryString($args_raw);
+ }
+
+ private function formatMercurialArguments($command, array $arguments) {
+ $spec = DiffusionMercurialWireProtocol::getCommandArgs($command);
+
+ $out = array();
+
+ // Mercurial takes normal arguments like this:
+ //
+ // name <length(value)>
+ // value
+
+ $has_star = false;
+ foreach ($spec as $arg_key) {
+ if ($arg_key == '*') {
+ $has_star = true;
+ continue;
+ }
+ if (isset($arguments[$arg_key])) {
+ $value = $arguments[$arg_key];
+ $size = strlen($value);
+ $out[] = "{$arg_key} {$size}\n{$value}";
+ unset($arguments[$arg_key]);
+ }
+ }
+
+ if ($has_star) {
+
+ // Mercurial takes arguments for variable argument lists roughly like
+ // this:
+ //
+ // * <count(args)>
+ // argname1 <length(argvalue1)>
+ // argvalue1
+ // argname2 <length(argvalue2)>
+ // argvalue2
+
+ $count = count($arguments);
+
+ $out[] = "* {$count}\n";
+
+ foreach ($arguments as $key => $value) {
+ if (in_array($key, $spec)) {
+ // We already added this argument above, so skip it.
+ continue;
+ }
+ $size = strlen($value);
+ $out[] = "{$key} {$size}\n{$value}";
+ }
+ }
+
+ return implode('', $out);
+ }
+
}
Index: src/applications/diffusion/protocol/DiffusionMercurialWireProtocol.php
===================================================================
--- /dev/null
+++ src/applications/diffusion/protocol/DiffusionMercurialWireProtocol.php
@@ -0,0 +1,62 @@
+<?php
+
+final class DiffusionMercurialWireProtocol {
+
+ public static function getCommandArgs($command) {
+ // We need to enumerate all of the Mercurial wire commands because the
+ // argument encoding varies based on the command. "Why?", you might ask,
+ // "Why would you do this?".
+
+ $commands = array(
+ 'batch' => array('cmds', '*'),
+ 'between' => array('pairs'),
+ 'branchmap' => array(),
+ 'branches' => array('nodes'),
+ 'capabilities' => array(),
+ 'changegroup' => array('roots'),
+ 'changegroupsubset' => array('bases heads'),
+ 'debugwireargs' => array('one two *'),
+ 'getbundle' => array('*'),
+ 'heads' => array(),
+ 'hello' => array(),
+ 'known' => array('nodes', '*'),
+ 'listkeys' => array('namespace'),
+ 'lookup' => array('key'),
+ 'pushkey' => array('namespace', 'key', 'old', 'new'),
+ 'stream_out' => array(''),
+ 'unbundle' => array('heads'),
+ );
+
+ if (!isset($commands[$command])) {
+ throw new Exception("Unknown Mercurial command '{$command}!");
+ }
+
+ return $commands[$command];
+ }
+
+ public static function isReadOnlyCommand($command) {
+ $read_only = array(
+ 'between' => true,
+ 'branchmap' => true,
+ 'branches' => true,
+ 'capabilities' => true,
+ 'changegroup' => true,
+ 'changegroupsubset' => true,
+ 'debugwireargs' => true,
+ 'getbundle' => true,
+ 'heads' => true,
+ 'hello' => true,
+ 'known' => true,
+ 'listkeys' => true,
+ 'lookup' => true,
+ 'stream_out' => true,
+ );
+
+ // Notably, the write commands are "pushkey" and "unbundle". The
+ // "batch" command is theoretically read only, but we require explicit
+ // analysis of the actual commands.
+
+ return isset($read_only[$command]);
+ }
+
+}
Index: src/applications/diffusion/response/DiffusionGitResponse.php
===================================================================
--- src/applications/diffusion/response/DiffusionGitResponse.php
+++ src/applications/diffusion/response/DiffusionGitResponse.php
@@ -30,7 +30,7 @@
}
public function getHeaders() {
- return $this->headers;
+ return array_merge(parent::getHeaders(), $this->headers);
}
public function getCacheHeaders() {
Index: src/applications/diffusion/response/DiffusionMercurialResponse.php
===================================================================
--- /dev/null
+++ src/applications/diffusion/response/DiffusionMercurialResponse.php
@@ -0,0 +1,31 @@
+<?php
+
+final class DiffusionMercurialResponse extends AphrontResponse {
+
+ private $content;
+
+ public function setContent($content) {
+ $this->content = $content;
+ return $this;
+ }
+
+ public function buildResponseString() {
+ return $this->content;
+ }
+
+ public function getHeaders() {
+ $headers = array(
+ array('Content-Type', 'application/mercurial-0.1'),
+ );
+ return array_merge(parent::getHeaders(), $headers);
+ }
+
+ public function getCacheHeaders() {
+ return array();
+ }
+
+ public function getHTTPResponseCode() {
+ return 200;
+ }
+
+}

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