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DiffusionCommitHookEngine.php
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DiffusionCommitHookEngine.php
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			<?php

			/**
			* @task config Configuring the Hook Engine
			* @task hook Hook Execution
			* @task git Git Hooks
			* @task hg Mercurial Hooks
			* @task svn Subversion Hooks
			* @task internal Internals
			*/
			final class DiffusionCommitHookEngine extends Phobject {

			const ENV_REPOSITORY = 'PHABRICATOR_REPOSITORY';
			const ENV_USER = 'PHABRICATOR_USER';
			const ENV_REMOTE_ADDRESS = 'PHABRICATOR_REMOTE_ADDRESS';
			const ENV_REMOTE_PROTOCOL = 'PHABRICATOR_REMOTE_PROTOCOL';

			const EMPTY_HASH = '0000000000000000000000000000000000000000';

			private $viewer;
			private $repository;
			private $stdin;
			private $originalArgv;
			private $subversionTransaction;
			private $subversionRepository;
			private $remoteAddress;
			private $remoteProtocol;
			private $transactionKey;
			private $mercurialHook;
			private $mercurialCommits = array();
			private $gitCommits = array();

			private $heraldViewerProjects;
			private $rejectCode = PhabricatorRepositoryPushLog::REJECT_BROKEN;
			private $rejectDetails;
			private $emailPHIDs = array();


			/* -( Config )------------------------------------------------------------- */


			public function setRemoteProtocol($remote_protocol) {
			$this->remoteProtocol = $remote_protocol;
			return $this;
			}

			public function getRemoteProtocol() {
			return $this->remoteProtocol;
			}

			public function setRemoteAddress($remote_address) {
			$this->remoteAddress = $remote_address;
			return $this;
			}

			public function getRemoteAddress() {
			return $this->remoteAddress;
			}

			public function setSubversionTransactionInfo($transaction, $repository) {
			$this->subversionTransaction = $transaction;
			$this->subversionRepository = $repository;
			return $this;
			}

			public function setStdin($stdin) {
			$this->stdin = $stdin;
			return $this;
			}

			public function getStdin() {
			return $this->stdin;
			}

			public function setOriginalArgv(array $original_argv) {
			$this->originalArgv = $original_argv;
			return $this;
			}

			public function getOriginalArgv() {
			return $this->originalArgv;
			}

			public function setRepository(PhabricatorRepository $repository) {
			$this->repository = $repository;
			return $this;
			}

			public function getRepository() {
			return $this->repository;
			}

			public function setViewer(PhabricatorUser $viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			public function getViewer() {
			return $this->viewer;
			}

			public function setMercurialHook($mercurial_hook) {
			$this->mercurialHook = $mercurial_hook;
			return $this;
			}

			public function getMercurialHook() {
			return $this->mercurialHook;
			}


			/* -( Hook Execution )----------------------------------------------------- */


			public function execute() {
			$ref_updates = $this->findRefUpdates();
			$all_updates = $ref_updates;

			$caught = null;
			try {

			try {
			$this->rejectDangerousChanges($ref_updates);
			} catch (DiffusionCommitHookRejectException $ex) {
			// If we're rejecting dangerous changes, flag everything that we've
			// seen as rejected so it's clear that none of it was accepted.
			$this->rejectCode = PhabricatorRepositoryPushLog::REJECT_DANGEROUS;
			throw $ex;
			}

			$this->applyHeraldRefRules($ref_updates, $all_updates);

			$content_updates = $this->findContentUpdates($ref_updates);
			$all_updates = array_merge($all_updates, $content_updates);

			$this->applyHeraldContentRules($content_updates, $all_updates);

			// Run custom scripts in `hook.d/` directories.
			$this->applyCustomHooks($all_updates);

			// If we make it this far, we're accepting these changes. Mark all the
			// logs as accepted.
			$this->rejectCode = PhabricatorRepositoryPushLog::REJECT_ACCEPT;
			} catch (Exception $ex) {
			// We'll throw this again in a minute, but we want to save all the logs
			// first.
			$caught = $ex;
			}

			// Save all the logs no matter what the outcome was.
			$event = $this->newPushEvent();

			$event->setRejectCode($this->rejectCode);
			$event->setRejectDetails($this->rejectDetails);

			$event->openTransaction();
			$event->save();
			foreach ($all_updates as $update) {
			$update->setPushEventPHID($event->getPHID());
			$update->save();
			}
			$event->saveTransaction();

			if ($caught) {
			throw $caught;
			}

			// If this went through cleanly, detect pushes which are actually imports
			// of an existing repository rather than an addition of new commits. If
			// this push is importing a bunch of stuff, set the importing flag on
			// the repository. It will be cleared once we fully process everything.

			if ($this->isInitialImport($all_updates)) {
			$repository = $this->getRepository();
			$repository->markImporting();
			}

			if ($this->emailPHIDs) {
			// If Herald rules triggered email to users, queue a worker to send the
			// mail. We do this out-of-process so that we block pushes as briefly
			// as possible.

			// (We do need to pull some commit info here because the commit objects
			// may not exist yet when this worker runs, which could be immediately.)

			PhabricatorWorker::scheduleTask(
			'PhabricatorRepositoryPushMailWorker',
			array(
			'eventPHID' => $event->getPHID(),
			'emailPHIDs' => array_values($this->emailPHIDs),
			'info' => $this->loadCommitInfoForWorker($all_updates),
			),
			array(
			'priority' => PhabricatorWorker::PRIORITY_ALERTS,
			));
			}

			return 0;
			}

			private function findRefUpdates() {
			$type = $this->getRepository()->getVersionControlSystem();
			switch ($type) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
			return $this->findGitRefUpdates();
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			return $this->findMercurialRefUpdates();
			case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
			return $this->findSubversionRefUpdates();
			default:
			throw new Exception(pht('Unsupported repository type "%s"!', $type));
			}
			}

			private function rejectDangerousChanges(array $ref_updates) {
			assert_instances_of($ref_updates, 'PhabricatorRepositoryPushLog');

			$repository = $this->getRepository();
			if ($repository->shouldAllowDangerousChanges()) {
			return;
			}

			$flag_dangerous = PhabricatorRepositoryPushLog::CHANGEFLAG_DANGEROUS;

			foreach ($ref_updates as $ref_update) {
			if (!$ref_update->hasChangeFlags($flag_dangerous)) {
			// This is not a dangerous change.
			continue;
			}

			// We either have a branch deletion or a non fast-forward branch update.
			// Format a message and reject the push.

			$message = pht(
			"DANGEROUS CHANGE: %s\n".
			"Dangerous change protection is enabled for this repository.\n".
			"Edit the repository configuration before making dangerous changes.",
			$ref_update->getDangerousChangeDescription());

			throw new DiffusionCommitHookRejectException($message);
			}
			}

			private function findContentUpdates(array $ref_updates) {
			assert_instances_of($ref_updates, 'PhabricatorRepositoryPushLog');

			$type = $this->getRepository()->getVersionControlSystem();
			switch ($type) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
			return $this->findGitContentUpdates($ref_updates);
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			return $this->findMercurialContentUpdates($ref_updates);
			case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
			return $this->findSubversionContentUpdates($ref_updates);
			default:
			throw new Exception(pht('Unsupported repository type "%s"!', $type));
			}
			}


			/* -( Herald )------------------------------------------------------------- */

			private function applyHeraldRefRules(
			array $ref_updates,
			array $all_updates) {
			$this->applyHeraldRules(
			$ref_updates,
			new HeraldPreCommitRefAdapter(),
			$all_updates);
			}

			private function applyHeraldContentRules(
			array $content_updates,
			array $all_updates) {
			$this->applyHeraldRules(
			$content_updates,
			new HeraldPreCommitContentAdapter(),
			$all_updates);
			}

			private function applyHeraldRules(
			array $updates,
			HeraldAdapter $adapter_template,
			array $all_updates) {

			if (!$updates) {
			return;
			}

			$adapter_template->setHookEngine($this);

			$engine = new HeraldEngine();
			$rules = null;
			$blocking_effect = null;
			$blocked_update = null;
			$blocking_xscript = null;
			foreach ($updates as $update) {
			$adapter = id(clone $adapter_template)
			->setPushLog($update);

			if ($rules === null) {
			$rules = $engine->loadRulesForAdapter($adapter);
			}

			$effects = $engine->applyRules($rules, $adapter);
			$engine->applyEffects($effects, $adapter, $rules);
			$xscript = $engine->getTranscript();

			// Store any PHIDs we want to send email to for later.
			foreach ($adapter->getEmailPHIDs() as $email_phid) {
			$this->emailPHIDs[$email_phid] = $email_phid;
			}

			$block_action = DiffusionBlockHeraldAction::ACTIONCONST;

			if ($blocking_effect === null) {
			foreach ($effects as $effect) {
			if ($effect->getAction() == $block_action) {
			$blocking_effect = $effect;
			$blocked_update = $update;
			$blocking_xscript = $xscript;
			break;
			}
			}
			}
			}

			if ($blocking_effect) {
			$rule = $blocking_effect->getRule();

			$this->rejectCode = PhabricatorRepositoryPushLog::REJECT_HERALD;
			$this->rejectDetails = $rule->getPHID();

			$message = $blocking_effect->getTarget();
			if (!strlen($message)) {
			$message = pht('(None.)');
			}

			$blocked_ref_name = coalesce(
			$blocked_update->getRefName(),
			$blocked_update->getRefNewShort());
			$blocked_name = $blocked_update->getRefType().'/'.$blocked_ref_name;

			throw new DiffusionCommitHookRejectException(
			pht(
			"This push was rejected by Herald push rule %s.\n".
			" Change: %s\n".
			" Rule: %s\n".
			" Reason: %s\n".
			"Transcript: %s",
			$rule->getMonogram(),
			$blocked_name,
			$rule->getName(),
			$message,
			PhabricatorEnv::getProductionURI(
			'/herald/transcript/'.$blocking_xscript->getID().'/')));
			}
			}

			public function loadViewerProjectPHIDsForHerald() {
			// This just caches the viewer's projects so we don't need to load them
			// over and over again when applying Herald rules.
			if ($this->heraldViewerProjects === null) {
			$this->heraldViewerProjects = id(new PhabricatorProjectQuery())
			->setViewer($this->getViewer())
			->withMemberPHIDs(array($this->getViewer()->getPHID()))
			->execute();
			}

			return mpull($this->heraldViewerProjects, 'getPHID');
			}


			/* -( Git )---------------------------------------------------------------- */


			private function findGitRefUpdates() {
			$ref_updates = array();

			// First, parse stdin, which lists all the ref changes. The input looks
			// like this:
			//
			// <old hash> <new hash> <ref>

			$stdin = $this->getStdin();
			$lines = phutil_split_lines($stdin, $retain_endings = false);
			foreach ($lines as $line) {
			$parts = explode(' ', $line, 3);
			if (count($parts) != 3) {
			throw new Exception(pht('Expected "old new ref", got "%s".', $line));
			}

			$ref_old = $parts[0];
			$ref_new = $parts[1];
			$ref_raw = $parts[2];

			if (preg_match('(^refs/heads/)', $ref_raw)) {
			$ref_type = PhabricatorRepositoryPushLog::REFTYPE_BRANCH;
			$ref_raw = substr($ref_raw, strlen('refs/heads/'));
			} else if (preg_match('(^refs/tags/)', $ref_raw)) {
			$ref_type = PhabricatorRepositoryPushLog::REFTYPE_TAG;
			$ref_raw = substr($ref_raw, strlen('refs/tags/'));
			} else {
			throw new Exception(
			pht(
			"Unable to identify the reftype of '%s'. Rejecting push.",
			$ref_raw));
			}

			$ref_update = $this->newPushLog()
			->setRefType($ref_type)
			->setRefName($ref_raw)
			->setRefOld($ref_old)
			->setRefNew($ref_new);

			$ref_updates[] = $ref_update;
			}

			$this->findGitMergeBases($ref_updates);
			$this->findGitChangeFlags($ref_updates);

			return $ref_updates;
			}


			private function findGitMergeBases(array $ref_updates) {
			assert_instances_of($ref_updates, 'PhabricatorRepositoryPushLog');

			$futures = array();
			foreach ($ref_updates as $key => $ref_update) {
			// If the old hash is "00000...", the ref is being created (either a new
			// branch, or a new tag). If the new hash is "00000...", the ref is being
			// deleted. If both are nonempty, the ref is being updated. For updates,
			// we'll figure out the `merge-base` of the old and new objects here. This
			// lets us reject non-FF changes cheaply; later, we'll figure out exactly
			// which commits are new.
			$ref_old = $ref_update->getRefOld();
			$ref_new = $ref_update->getRefNew();

			if (($ref_old === self::EMPTY_HASH) \|\|
			($ref_new === self::EMPTY_HASH)) {
			continue;
			}

			$futures[$key] = $this->getRepository()->getLocalCommandFuture(
			'merge-base %s %s',
			$ref_old,
			$ref_new);
			}

			$futures = id(new FutureIterator($futures))
			->limit(8);
			foreach ($futures as $key => $future) {

			// If 'old' and 'new' have no common ancestors (for example, a force push
			// which completely rewrites a ref), `git merge-base` will exit with
			// an error and no output. It would be nice to find a positive test
			// for this instead, but I couldn't immediately come up with one. See
			// T4224. Assume this means there are no ancestors.

			list($err, $stdout) = $future->resolve();

			if ($err) {
			$merge_base = null;
			} else {
			$merge_base = rtrim($stdout, "\n");
			}

			$ref_update = $ref_updates[$key];
			$ref_update->setMergeBase($merge_base);
			}

			return $ref_updates;
			}


			private function findGitChangeFlags(array $ref_updates) {
			assert_instances_of($ref_updates, 'PhabricatorRepositoryPushLog');

			foreach ($ref_updates as $key => $ref_update) {
			$ref_old = $ref_update->getRefOld();
			$ref_new = $ref_update->getRefNew();
			$ref_type = $ref_update->getRefType();

			$ref_flags = 0;
			$dangerous = null;

			if (($ref_old === self::EMPTY_HASH) && ($ref_new === self::EMPTY_HASH)) {
			// This happens if you try to delete a tag or branch which does not
			// exist by pushing directly to the ref. Git will warn about it but
			// allow it. Just call it a delete, without flagging it as dangerous.
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;
			} else if ($ref_old === self::EMPTY_HASH) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_ADD;
			} else if ($ref_new === self::EMPTY_HASH) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;
			if ($ref_type == PhabricatorRepositoryPushLog::REFTYPE_BRANCH) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DANGEROUS;
			$dangerous = pht(
			"The change you're attempting to push deletes the branch '%s'.",
			$ref_update->getRefName());
			}
			} else {
			$merge_base = $ref_update->getMergeBase();
			if ($merge_base == $ref_old) {
			// This is a fast-forward update to an existing branch.
			// These are safe.
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_APPEND;
			} else {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_REWRITE;

			// For now, we don't consider deleting or moving tags to be a
			// "dangerous" update. It's way harder to get wrong and should be easy
			// to recover from once we have better logging. Only add the dangerous
			// flag if this ref is a branch.

			if ($ref_type == PhabricatorRepositoryPushLog::REFTYPE_BRANCH) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DANGEROUS;

			$dangerous = pht(
			"The change you're attempting to push updates the branch '%s' ".
			"from '%s' to '%s', but this is not a fast-forward. Pushes ".
			"which rewrite published branch history are dangerous.",
			$ref_update->getRefName(),
			$ref_update->getRefOldShort(),
			$ref_update->getRefNewShort());
			}
			}
			}

			$ref_update->setChangeFlags($ref_flags);
			if ($dangerous !== null) {
			$ref_update->attachDangerousChangeDescription($dangerous);
			}
			}

			return $ref_updates;
			}


			private function findGitContentUpdates(array $ref_updates) {
			$flag_delete = PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;

			$futures = array();
			foreach ($ref_updates as $key => $ref_update) {
			if ($ref_update->hasChangeFlags($flag_delete)) {
			// Deleting a branch or tag can never create any new commits.
			continue;
			}

			// NOTE: This piece of magic finds all new commits, by walking backward
			// from the new value to the value of any existing ref in the
			// repository. Particularly, this will cover the cases of a new branch, a
			// completely moved tag, etc.
			$futures[$key] = $this->getRepository()->getLocalCommandFuture(
			'log --format=%s %s --not --all',
			'%H',
			$ref_update->getRefNew());
			}

			$content_updates = array();
			$futures = id(new FutureIterator($futures))
			->limit(8);
			foreach ($futures as $key => $future) {
			list($stdout) = $future->resolvex();

			if (!strlen(trim($stdout))) {
			// This change doesn't have any new commits. One common case of this
			// is creating a new tag which points at an existing commit.
			continue;
			}

			$commits = phutil_split_lines($stdout, $retain_newlines = false);

			// If we're looking at a branch, mark all of the new commits as on that
			// branch. It's only possible for these commits to be on updated branches,
			// since any other branch heads are necessarily behind them.
			$branch_name = null;
			$ref_update = $ref_updates[$key];
			$type_branch = PhabricatorRepositoryPushLog::REFTYPE_BRANCH;
			if ($ref_update->getRefType() == $type_branch) {
			$branch_name = $ref_update->getRefName();
			}

			foreach ($commits as $commit) {
			if ($branch_name) {
			$this->gitCommits[$commit][] = $branch_name;
			}
			$content_updates[$commit] = $this->newPushLog()
			->setRefType(PhabricatorRepositoryPushLog::REFTYPE_COMMIT)
			->setRefNew($commit)
			->setChangeFlags(PhabricatorRepositoryPushLog::CHANGEFLAG_ADD);
			}
			}

			return $content_updates;
			}

			/* -( Custom )------------------------------------------------------------- */

			private function applyCustomHooks(array $updates) {
			$args = $this->getOriginalArgv();
			$stdin = $this->getStdin();
			$console = PhutilConsole::getConsole();

			$env = array(
			self::ENV_REPOSITORY => $this->getRepository()->getPHID(),
			self::ENV_USER => $this->getViewer()->getUsername(),
			self::ENV_REMOTE_PROTOCOL => $this->getRemoteProtocol(),
			self::ENV_REMOTE_ADDRESS => $this->getRemoteAddress(),
			);

			$repository = $this->getRepository();

			$env += $repository->getPassthroughEnvironmentalVariables();

			$directories = $repository->getHookDirectories();
			foreach ($directories as $directory) {
			$hooks = $this->getExecutablesInDirectory($directory);
			sort($hooks);
			foreach ($hooks as $hook) {
			// NOTE: We're explicitly running the hooks in sequential order to
			// make this more predictable.
			$future = id(new ExecFuture('%s %Ls', $hook, $args))
			->setEnv($env, $wipe_process_env = false)
			->write($stdin);

			list($err, $stdout, $stderr) = $future->resolve();
			if (!$err) {
			// This hook ran OK, but echo its output in case there was something
			// informative.
			$console->writeOut('%s', $stdout);
			$console->writeErr('%s', $stderr);
			continue;
			}

			$this->rejectCode = PhabricatorRepositoryPushLog::REJECT_EXTERNAL;
			$this->rejectDetails = basename($hook);

			throw new DiffusionCommitHookRejectException(
			pht(
			"This push was rejected by custom hook script '%s':\n\n%s%s",
			basename($hook),
			$stdout,
			$stderr));
			}
			}
			}

			private function getExecutablesInDirectory($directory) {
			$executables = array();

			if (!Filesystem::pathExists($directory)) {
			return $executables;
			}

			foreach (Filesystem::listDirectory($directory) as $path) {
			$full_path = $directory.DIRECTORY_SEPARATOR.$path;
			if (!is_executable($full_path)) {
			// Don't include non-executable files.
			continue;
			}

			if (basename($full_path) == 'README') {
			// Don't include README, even if it is marked as executable. It almost
			// certainly got caught in the crossfire of a sweeping `chmod`, since
			// users do this with some frequency.
			continue;
			}

			$executables[] = $full_path;
			}

			return $executables;
			}


			/* -( Mercurial )---------------------------------------------------------- */


			private function findMercurialRefUpdates() {
			$hook = $this->getMercurialHook();
			switch ($hook) {
			case 'pretxnchangegroup':
			return $this->findMercurialChangegroupRefUpdates();
			case 'prepushkey':
			return $this->findMercurialPushKeyRefUpdates();
			default:
			throw new Exception(pht('Unrecognized hook "%s"!', $hook));
			}
			}

			private function findMercurialChangegroupRefUpdates() {
			$hg_node = getenv('HG_NODE');
			if (!$hg_node) {
			throw new Exception(
			pht(
			'Expected %s in environment!',
			'HG_NODE'));
			}

			// NOTE: We need to make sure this is passed to subprocesses, or they won't
			// be able to see new commits. Mercurial uses this as a marker to determine
			// whether the pending changes are visible or not.
			$_ENV['HG_PENDING'] = getenv('HG_PENDING');
			$repository = $this->getRepository();

			$futures = array();

			foreach (array('old', 'new') as $key) {
			$futures[$key] = $repository->getLocalCommandFuture(
			'heads --template %s',
			'{node}\1{branch}\2');
			}
			// Wipe HG_PENDING out of the old environment so we see the pre-commit
			// state of the repository.
			$futures['old']->updateEnv('HG_PENDING', null);

			$futures['commits'] = $repository->getLocalCommandFuture(
			'log --rev %s --template %s',
			hgsprintf('%s:%s', $hg_node, 'tip'),
			'{node}\1{branch}\2');

			// Resolve all of the futures now. We don't need the 'commits' future yet,
			// but it simplifies the logic to just get it out of the way.
			foreach (new FutureIterator($futures) as $future) {
			$future->resolve();
			}

			list($commit_raw) = $futures['commits']->resolvex();
			$commit_map = $this->parseMercurialCommits($commit_raw);
			$this->mercurialCommits = $commit_map;

			// NOTE: `hg heads` exits with an error code and no output if the repository
			// has no heads. Most commonly this happens on a new repository. We know
			// we can run `hg` successfully since the `hg log` above didn't error, so
			// just ignore the error code.

			list($err, $old_raw) = $futures['old']->resolve();
			$old_refs = $this->parseMercurialHeads($old_raw);

			list($err, $new_raw) = $futures['new']->resolve();
			$new_refs = $this->parseMercurialHeads($new_raw);

			$all_refs = array_keys($old_refs + $new_refs);

			$ref_updates = array();
			foreach ($all_refs as $ref) {
			$old_heads = idx($old_refs, $ref, array());
			$new_heads = idx($new_refs, $ref, array());

			sort($old_heads);
			sort($new_heads);

			if (!$old_heads && !$new_heads) {
			// This should never be possible, as it makes no sense. Explode.
			throw new Exception(
			pht(
			'Mercurial repository has no new or old heads for branch "%s" '.
			'after push. This makes no sense; rejecting change.',
			$ref));
			}

			if ($old_heads === $new_heads) {
			// No changes to this branch, so skip it.
			continue;
			}

			$stray_heads = array();
			$head_map = array();

			if ($old_heads && !$new_heads) {
			// This is a branch deletion with "--close-branch".
			foreach ($old_heads as $old_head) {
			$head_map[$old_head] = array(self::EMPTY_HASH);
			}
			} else if (count($old_heads) > 1) {
			// HORRIBLE: In Mercurial, branches can have multiple heads. If the
			// old branch had multiple heads, we need to figure out which new
			// heads descend from which old heads, so we can tell whether you're
			// actively creating new heads (dangerous) or just working in a
			// repository that's already full of garbage (strongly discouraged but
			// not as inherently dangerous). These cases should be very uncommon.

			// NOTE: We're only looking for heads on the same branch. The old
			// tip of the branch may be the branchpoint for other branches, but that
			// is OK.

			$dfutures = array();
			foreach ($old_heads as $old_head) {
			$dfutures[$old_head] = $repository->getLocalCommandFuture(
			'log --branch %s --rev %s --template %s',
			$ref,
			hgsprintf('(descendants(%s) and head())', $old_head),
			'{node}\1');
			}

			foreach (new FutureIterator($dfutures) as $future_head => $dfuture) {
			list($stdout) = $dfuture->resolvex();
			$descendant_heads = array_filter(explode("\1", $stdout));
			if ($descendant_heads) {
			// This old head has at least one descendant in the push.
			$head_map[$future_head] = $descendant_heads;
			} else {
			// This old head has no descendants, so it is being deleted.
			$head_map[$future_head] = array(self::EMPTY_HASH);
			}
			}

			// Now, find all the new stray heads this push creates, if any. These
			// are new heads which do not descend from the old heads.
			$seen = array_fuse(array_mergev($head_map));
			foreach ($new_heads as $new_head) {
			if ($new_head === self::EMPTY_HASH) {
			// If a branch head is being deleted, don't insert it as an add.
			continue;
			}
			if (empty($seen[$new_head])) {
			$head_map[self::EMPTY_HASH][] = $new_head;
			}
			}
			} else if ($old_heads) {
			$head_map[head($old_heads)] = $new_heads;
			} else {
			$head_map[self::EMPTY_HASH] = $new_heads;
			}

			foreach ($head_map as $old_head => $child_heads) {
			foreach ($child_heads as $new_head) {
			if ($new_head === $old_head) {
			continue;
			}

			$ref_flags = 0;
			$dangerous = null;
			if ($old_head == self::EMPTY_HASH) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_ADD;
			} else {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_APPEND;
			}


			$deletes_existing_head = ($new_head == self::EMPTY_HASH);
			$splits_existing_head = (count($child_heads) > 1);
			$creates_duplicate_head = ($old_head == self::EMPTY_HASH) &&
			(count($head_map) > 1);

			if ($splits_existing_head \|\| $creates_duplicate_head) {
			$readable_child_heads = array();
			foreach ($child_heads as $child_head) {
			$readable_child_heads[] = substr($child_head, 0, 12);
			}

			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DANGEROUS;

			if ($splits_existing_head) {
			// We're splitting an existing head into two or more heads.
			// This is dangerous, and a super bad idea. Note that we're only
			// raising this if you're actively splitting a branch head. If a
			// head split in the past, we don't consider appends to it
			// to be dangerous.
			$dangerous = pht(
			"The change you're attempting to push splits the head of ".
			"branch '%s' into multiple heads: %s. This is inadvisable ".
			"and dangerous.",
			$ref,
			implode(', ', $readable_child_heads));
			} else {
			// We're adding a second (or more) head to a branch. The new
			// head is not a descendant of any old head.
			$dangerous = pht(
			"The change you're attempting to push creates new, divergent ".
			"heads for the branch '%s': %s. This is inadvisable and ".
			"dangerous.",
			$ref,
			implode(', ', $readable_child_heads));
			}
			}

			if ($deletes_existing_head) {
			// TODO: Somewhere in here we should be setting CHANGEFLAG_REWRITE
			// if we are also creating at least one other head to replace
			// this one.

			// NOTE: In Git, this is a dangerous change, but it is not dangerous
			// in Mercurial. Mercurial branches are version controlled, and
			// Mercurial does not prompt you for any special flags when pushing
			// a `--close-branch` commit by default.

			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;
			}

			$ref_update = $this->newPushLog()
			->setRefType(PhabricatorRepositoryPushLog::REFTYPE_BRANCH)
			->setRefName($ref)
			->setRefOld($old_head)
			->setRefNew($new_head)
			->setChangeFlags($ref_flags);

			if ($dangerous !== null) {
			$ref_update->attachDangerousChangeDescription($dangerous);
			}

			$ref_updates[] = $ref_update;
			}
			}
			}

			return $ref_updates;
			}

			private function findMercurialPushKeyRefUpdates() {
			$key_namespace = getenv('HG_NAMESPACE');

			if ($key_namespace === 'phases') {
			// Mercurial changes commit phases as part of normal push operations. We
			// just ignore these, as they don't seem to represent anything
			// interesting.
			return array();
			}

			$key_name = getenv('HG_KEY');

			$key_old = getenv('HG_OLD');
			if (!strlen($key_old)) {
			$key_old = null;
			}

			$key_new = getenv('HG_NEW');
			if (!strlen($key_new)) {
			$key_new = null;
			}

			if ($key_namespace !== 'bookmarks') {
			throw new Exception(
			pht(
			"Unknown Mercurial key namespace '%s', with key '%s' (%s -> %s). ".
			"Rejecting push.",
			$key_namespace,
			$key_name,
			coalesce($key_old, pht('null')),
			coalesce($key_new, pht('null'))));
			}

			if ($key_old === $key_new) {
			// We get a callback when the bookmark doesn't change. Just ignore this,
			// as it's a no-op.
			return array();
			}

			$ref_flags = 0;
			$merge_base = null;
			if ($key_old === null) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_ADD;
			} else if ($key_new === null) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_DELETE;
			} else {
			list($merge_base_raw) = $this->getRepository()->execxLocalCommand(
			'log --template %s --rev %s',
			'{node}',
			hgsprintf('ancestor(%s, %s)', $key_old, $key_new));

			if (strlen(trim($merge_base_raw))) {
			$merge_base = trim($merge_base_raw);
			}

			if ($merge_base && ($merge_base === $key_old)) {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_APPEND;
			} else {
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_REWRITE;
			}
			}

			$ref_update = $this->newPushLog()
			->setRefType(PhabricatorRepositoryPushLog::REFTYPE_BOOKMARK)
			->setRefName($key_name)
			->setRefOld(coalesce($key_old, self::EMPTY_HASH))
			->setRefNew(coalesce($key_new, self::EMPTY_HASH))
			->setChangeFlags($ref_flags);

			return array($ref_update);
			}

			private function findMercurialContentUpdates(array $ref_updates) {
			$content_updates = array();

			foreach ($this->mercurialCommits as $commit => $branches) {
			$content_updates[$commit] = $this->newPushLog()
			->setRefType(PhabricatorRepositoryPushLog::REFTYPE_COMMIT)
			->setRefNew($commit)
			->setChangeFlags(PhabricatorRepositoryPushLog::CHANGEFLAG_ADD);
			}

			return $content_updates;
			}

			private function parseMercurialCommits($raw) {
			$commits_lines = explode("\2", $raw);
			$commits_lines = array_filter($commits_lines);
			$commit_map = array();
			foreach ($commits_lines as $commit_line) {
			list($node, $branch) = explode("\1", $commit_line);
			$commit_map[$node] = array($branch);
			}

			return $commit_map;
			}

			private function parseMercurialHeads($raw) {
			$heads_map = $this->parseMercurialCommits($raw);

			$heads = array();
			foreach ($heads_map as $commit => $branches) {
			foreach ($branches as $branch) {
			$heads[$branch][] = $commit;
			}
			}

			return $heads;
			}


			/* -( Subversion )--------------------------------------------------------- */


			private function findSubversionRefUpdates() {
			// Subversion doesn't have any kind of mutable ref metadata.
			return array();
			}

			private function findSubversionContentUpdates(array $ref_updates) {
			list($youngest) = execx(
			'svnlook youngest %s',
			$this->subversionRepository);
			$ref_new = (int)$youngest + 1;

			$ref_flags = 0;
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_ADD;
			$ref_flags \|= PhabricatorRepositoryPushLog::CHANGEFLAG_APPEND;

			$ref_content = $this->newPushLog()
			->setRefType(PhabricatorRepositoryPushLog::REFTYPE_COMMIT)
			->setRefNew($ref_new)
			->setChangeFlags($ref_flags);

			return array($ref_content);
			}


			/* -( Internals )---------------------------------------------------------- */


			private function newPushLog() {
			// NOTE: We generate PHIDs up front so the Herald transcripts can pick them
			// up.
			$phid = id(new PhabricatorRepositoryPushLog())->generatePHID();

			$device = AlmanacKeys::getLiveDevice();
			if ($device) {
			$device_phid = $device->getPHID();
			} else {
			$device_phid = null;
			}

			return PhabricatorRepositoryPushLog::initializeNewLog($this->getViewer())
			->setPHID($phid)
			->setDevicePHID($device_phid)
			->setRepositoryPHID($this->getRepository()->getPHID())
			->attachRepository($this->getRepository())
			->setEpoch(time());
			}

			private function newPushEvent() {
			$viewer = $this->getViewer();
			return PhabricatorRepositoryPushEvent::initializeNewEvent($viewer)
			->setRepositoryPHID($this->getRepository()->getPHID())
			->setRemoteAddress($this->getRemoteAddress())
			->setRemoteProtocol($this->getRemoteProtocol())
			->setEpoch(time());
			}

			public function loadChangesetsForCommit($identifier) {
			$byte_limit = HeraldCommitAdapter::getEnormousByteLimit();
			$time_limit = HeraldCommitAdapter::getEnormousTimeLimit();

			$vcs = $this->getRepository()->getVersionControlSystem();
			switch ($vcs) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			// For git and hg, we can use normal commands.
			$drequest = DiffusionRequest::newFromDictionary(
			array(
			'repository' => $this->getRepository(),
			'user' => $this->getViewer(),
			'commit' => $identifier,
			));

			$raw_diff = DiffusionRawDiffQuery::newFromDiffusionRequest($drequest)
			->setTimeout($time_limit)
			->setByteLimit($byte_limit)
			->setLinesOfContext(0)
			->executeInline();
			break;
			case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
			// TODO: This diff has 3 lines of context, which produces slightly
			// incorrect "added file content" and "removed file content" results.
			// This may also choke on binaries, but "svnlook diff" does not support
			// the "--diff-cmd" flag.

			// For subversion, we need to use `svnlook`.
			$future = new ExecFuture(
			'svnlook diff -t %s %s',
			$this->subversionTransaction,
			$this->subversionRepository);

			$future->setTimeout($time_limit);
			$future->setStdoutSizeLimit($byte_limit);
			$future->setStderrSizeLimit($byte_limit);

			list($raw_diff) = $future->resolvex();
			break;
			default:
			throw new Exception(pht("Unknown VCS '%s!'", $vcs));
			}

			if (strlen($raw_diff) >= $byte_limit) {
			throw new Exception(
			pht(
			'The raw text of this change is enormous (larger than %d '.
			'bytes). Herald can not process it.',
			$byte_limit));
			}

			if (!strlen($raw_diff)) {
			// If the commit is actually empty, just return no changesets.
			return array();
			}

			$parser = new ArcanistDiffParser();
			$changes = $parser->parseDiff($raw_diff);
			$diff = DifferentialDiff::newEphemeralFromRawChanges(
			$changes);
			return $diff->getChangesets();
			}

			public function loadCommitRefForCommit($identifier) {
			$repository = $this->getRepository();
			$vcs = $repository->getVersionControlSystem();
			switch ($vcs) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			return id(new DiffusionLowLevelCommitQuery())
			->setRepository($repository)
			->withIdentifier($identifier)
			->execute();
			case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
			// For subversion, we need to use `svnlook`.
			list($message) = execx(
			'svnlook log -t %s %s',
			$this->subversionTransaction,
			$this->subversionRepository);

			return id(new DiffusionCommitRef())
			->setMessage($message);
			break;
			default:
			throw new Exception(pht("Unknown VCS '%s!'", $vcs));
			}
			}

			public function loadBranches($identifier) {
			$repository = $this->getRepository();
			$vcs = $repository->getVersionControlSystem();
			switch ($vcs) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
			return idx($this->gitCommits, $identifier, array());
			case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
			// NOTE: This will be "the branch the commit was made to", not
			// "a list of all branch heads which descend from the commit".
			// This is consistent with Mercurial, but possibly confusing.
			return idx($this->mercurialCommits, $identifier, array());
			case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
			// Subversion doesn't have branches.
			return array();
			}
			}

			private function loadCommitInfoForWorker(array $all_updates) {
			$type_commit = PhabricatorRepositoryPushLog::REFTYPE_COMMIT;

			$map = array();
			foreach ($all_updates as $update) {
			if ($update->getRefType() != $type_commit) {
			continue;
			}
			$map[$update->getRefNew()] = array();
			}

			foreach ($map as $identifier => $info) {
			$ref = $this->loadCommitRefForCommit($identifier);
			$map[$identifier] += array(
			'summary' => $ref->getSummary(),
			'branches' => $this->loadBranches($identifier),
			);
			}

			return $map;
			}

			private function isInitialImport(array $all_updates) {
			$repository = $this->getRepository();

			$vcs = $repository->getVersionControlSystem();
			switch ($vcs) {
			case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
			// There is no meaningful way to import history into Subversion by
			// pushing.
			return false;
			default:
			break;
			}

			// Now, apply a heuristic to guess whether this is a normal commit or
			// an initial import. We guess something is an initial import if:
			//
			// - the repository is currently empty; and
			// - it pushes more than 7 commits at once.
			//
			// The number "7" is chosen arbitrarily as seeming reasonable. We could
			// also look at author data (do the commits come from multiple different
			// authors?) and commit date data (is the oldest commit more than 48 hours
			// old), but we don't have immediate access to those and this simple
			// heruistic might be good enough.

			$commit_count = 0;
			$type_commit = PhabricatorRepositoryPushLog::REFTYPE_COMMIT;
			foreach ($all_updates as $update) {
			if ($update->getRefType() != $type_commit) {
			continue;
			}
			$commit_count++;
			}

			if ($commit_count <= PhabricatorRepository::IMPORT_THRESHOLD) {
			// If this pushes a very small number of commits, assume it's an
			// initial commit or stack of a few initial commits.
			return false;
			}

			$any_commits = id(new DiffusionCommitQuery())
			->setViewer($this->getViewer())
			->withRepository($repository)
			->setLimit(1)
			->execute();

			if ($any_commits) {
			// If the repository already has commits, this isn't an import.
			return false;
			}

			return true;
			}

			}

phab/src/applications/diffusion/engine/DiffusionCommitHookEngine.php903e37a21b50production

DiffusionCommitHookEngine.phpView Options

phab/src/applications/diffusion/engine/DiffusionCommitHookEngine.php
903e37a21b50production

DiffusionCommitHookEngine.php
View Options