mirror of
https://we.phorge.it/source/phorge.git
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f56f1b05c0
Summary: Ref T10547. This has been around for a while but I was never able to reproduce it. I caught a repro case in the cluster recently and I think this is the right fix. We tell Subversion to run `ssh-connect` instead of `ssh` so we can provide options and credentials, by using `SVN_SSH` in the environment. Subversion will sometimes kill the SSH tunnel subprocess aggressively with SIGTERM -- as of writing, you can search for `SIGTERM` in `make_tunnel()` here: http://svn.apache.org/repos/asf/subversion/trunk/subversion/libsvn_ra_svn/client.c By default, when a PHP process gets SIGTERM it just exits immediately, without running destructors or shutdown functions. Since destructors/shutdown functions don't run, `TempFile` doesn't get a chance to remove the file. I don't have a clear picture of //when// Subversion sends SIGTERM to the child process. I can't really get this to trigger locally via `svn`, although I was able to get it to trigger explicitly. So I'm only about 95% sure this fixes it, but it seems likely. Test Plan: Locally, I couldn't get this to reproduce "normally" even knowing the cause (maybe Subversion doesn't do the SIGTERM stuff on OSX?) but I was able to get it to reproduce reliabily by adding `posix_kill(getmypid(), SIGTERM);` to the body of the script. With that added, running the script with `PHABRICATOR_CREDENTIAL=PHID-CDTL-...` in the environment reliably left straggler temporary files. Adding `declare()` and a signal handler fixed this: the script now runs the `TempFile` destructor and longer leaves the stragglers around. Reviewers: chad Reviewed By: chad Maniphest Tasks: T10547 Differential Revision: https://secure.phabricator.com/D16102
111 lines
2.9 KiB
PHP
Executable file
111 lines
2.9 KiB
PHP
Executable file
#!/usr/bin/env php
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<?php
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// This is a wrapper script for Git, Mercurial, and Subversion. It primarily
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// serves to inject "-o StrictHostKeyChecking=no" into the SSH arguments.
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// In some cases, Subversion sends us SIGTERM. If we don't catch the signal and
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// react to it, we won't run object destructors by default and thus won't clean
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// up temporary files. Declare ticks so we can install a signal handler.
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declare(ticks=1);
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$root = dirname(dirname(dirname(__FILE__)));
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require_once $root.'/scripts/__init_script__.php';
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// Contrary to the documentation, Git may pass a "-p" flag. If it does, respect
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// it and move it before the "--" argument.
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$args = new PhutilArgumentParser($argv);
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$args->parsePartial(
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array(
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array(
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'name' => 'port',
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'short' => 'p',
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'param' => pht('port'),
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'help' => pht('Port number to connect to.'),
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),
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));
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$unconsumed_argv = $args->getUnconsumedArgumentVector();
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if (function_exists('pcntl_signal')) {
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pcntl_signal(SIGTERM, 'ssh_connect_signal');
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}
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function ssh_connect_signal($signo) {
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// This is just letting destructors fire. In particular, we want to clean
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// up any temporary files we wrote. See T10547.
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exit(128 + $signo);
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}
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$pattern = array();
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$arguments = array();
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$pattern[] = 'ssh';
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$pattern[] = '-o';
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$pattern[] = 'StrictHostKeyChecking=no';
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// This prevents "known host" failures, and covers for issues where HOME is set
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// to something unusual.
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$pattern[] = '-o';
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$pattern[] = 'UserKnownHostsFile=/dev/null';
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$as_device = getenv('PHABRICATOR_AS_DEVICE');
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$credential_phid = getenv('PHABRICATOR_CREDENTIAL');
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if ($as_device) {
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$device = AlmanacKeys::getLiveDevice();
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if (!$device) {
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throw new Exception(
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pht(
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'Attempting to create an SSH connection that authenticates with '.
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'the current device, but this host is not configured as a cluster '.
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'device.'));
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}
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if ($credential_phid) {
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throw new Exception(
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pht(
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'Attempting to proxy an SSH connection that authenticates with '.
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'both the current device and a specific credential. These options '.
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'are mutually exclusive.'));
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}
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}
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if ($credential_phid) {
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$viewer = PhabricatorUser::getOmnipotentUser();
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$key = PassphraseSSHKey::loadFromPHID($credential_phid, $viewer);
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$pattern[] = '-l %P';
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$arguments[] = $key->getUsernameEnvelope();
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$pattern[] = '-i %P';
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$arguments[] = $key->getKeyfileEnvelope();
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}
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if ($as_device) {
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$pattern[] = '-l %R';
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$arguments[] = AlmanacKeys::getClusterSSHUser();
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$pattern[] = '-i %R';
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$arguments[] = AlmanacKeys::getKeyPath('device.key');
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}
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$port = $args->getArg('port');
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if ($port) {
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$pattern[] = '-p %d';
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$arguments[] = $port;
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}
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$pattern[] = '--';
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$passthru_args = $unconsumed_argv;
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foreach ($passthru_args as $passthru_arg) {
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$pattern[] = '%s';
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$arguments[] = $passthru_arg;
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}
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$pattern = implode(' ', $pattern);
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array_unshift($arguments, $pattern);
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$err = newv('PhutilExecPassthru', $arguments)
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->execute();
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exit($err);
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