D21864.diff
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	diff --git a/scripts/ssh/ssh-auth.php b/scripts/ssh/ssh-auth.php
	--- a/scripts/ssh/ssh-auth.php
	+++ b/scripts/ssh/ssh-auth.php
	@@ -36,7 +36,7 @@

	$authstruct = null;

	-if (strlen($authstruct_raw)) {
	+if ($authstruct_raw !== null && strlen($authstruct_raw)) {
	try {
	$authstruct = phutil_json_decode($authstruct_raw);
	} catch (Exception $ex) {
	@@ -135,7 +135,7 @@

	$cmd = csprintf('%s %Ls', $bin, $key_argv);

	- if (strlen($instance)) {
	+ if ($instance !== null && strlen($instance)) {
	$cmd = csprintf('PHABRICATOR_INSTANCE=%s %C', $instance, $cmd);
	}

	diff --git a/src/applications/almanac/util/AlmanacKeys.php b/src/applications/almanac/util/AlmanacKeys.php
	--- a/src/applications/almanac/util/AlmanacKeys.php
	+++ b/src/applications/almanac/util/AlmanacKeys.php
	@@ -58,7 +58,7 @@

	public static function getClusterSSHUser() {
	$username = PhabricatorEnv::getEnvConfig('diffusion.ssh-user');
	- if (strlen($username)) {
	+ if ($username !== null && strlen($username)) {
	return $username;
	}

	diff --git a/src/applications/conduit/query/PhabricatorConduitSearchEngine.php b/src/applications/conduit/query/PhabricatorConduitSearchEngine.php
	--- a/src/applications/conduit/query/PhabricatorConduitSearchEngine.php
	+++ b/src/applications/conduit/query/PhabricatorConduitSearchEngine.php
	@@ -39,7 +39,7 @@
	$query->withIsInternal(false);

	$contains = $saved->getParameter('nameContains');
	- if (strlen($contains)) {
	+ if ($contains !== null && strlen($contains)) {
	$query->withNameContains($contains);
	}

	diff --git a/src/applications/config/controller/module/PhabricatorConfigModuleController.php b/src/applications/config/controller/module/PhabricatorConfigModuleController.php
	--- a/src/applications/config/controller/module/PhabricatorConfigModuleController.php
	+++ b/src/applications/config/controller/module/PhabricatorConfigModuleController.php
	@@ -9,7 +9,7 @@

	$all_modules = PhabricatorConfigModule::getAllModules();

	- if (!strlen($key)) {
	+ if ($key === null \|\| !strlen($key)) {
	$key = head_key($all_modules);
	}

	diff --git a/src/applications/differential/conduit/DifferentialGetCommitMessageConduitAPIMethod.php b/src/applications/differential/conduit/DifferentialGetCommitMessageConduitAPIMethod.php
	--- a/src/applications/differential/conduit/DifferentialGetCommitMessageConduitAPIMethod.php
	+++ b/src/applications/differential/conduit/DifferentialGetCommitMessageConduitAPIMethod.php
	@@ -56,7 +56,7 @@
	// show "Field:" templates for some fields even if they are empty.
	$edit_mode = $request->getValue('edit');

	- $is_any_edit = (bool)strlen($edit_mode);
	+ $is_any_edit = $edit_mode !== null && (bool)strlen($edit_mode);
	$is_create = ($edit_mode == 'create');

	$field_list = DifferentialCommitMessageField::newEnabledFields($viewer);
	@@ -115,7 +115,7 @@

	$is_title = ($field_key == $key_title);

	- if (!strlen($value)) {
	+ if ($value === null \|\| !strlen($value)) {
	if ($is_template) {
	$commit_message[] = $label.': ';
	}
	diff --git a/src/applications/differential/customfield/DifferentialBranchField.php b/src/applications/differential/customfield/DifferentialBranchField.php
	--- a/src/applications/differential/customfield/DifferentialBranchField.php
	+++ b/src/applications/differential/customfield/DifferentialBranchField.php
	@@ -39,13 +39,20 @@
	$branch = $diff->getBranch();
	$bookmark = $diff->getBookmark();

	+ if ($branch === null) {
	+ $branch = '';
	+ }
	+ if ($bookmark === null) {
	+ $bookmark = '';
	+ }
	+
	if (strlen($branch) && strlen($bookmark)) {
	return pht('%s (bookmark) on %s (branch)', $bookmark, $branch);
	} else if (strlen($bookmark)) {
	return pht('%s (bookmark)', $bookmark);
	} else if (strlen($branch)) {
	$onto = $diff->loadTargetBranch();
	- if (strlen($onto) && ($onto !== $branch)) {
	+ if ($onto !== null && strlen($onto) && ($onto !== $branch)) {
	return pht(
	'%s (branched from %s)',
	$branch,
	diff --git a/src/applications/differential/field/DifferentialCommitMessageField.php b/src/applications/differential/field/DifferentialCommitMessageField.php
	--- a/src/applications/differential/field/DifferentialCommitMessageField.php
	+++ b/src/applications/differential/field/DifferentialCommitMessageField.php
	@@ -60,7 +60,7 @@
	}

	public function renderFieldValue($value) {
	- if (!strlen($value)) {
	+ if ($value === null \|\| !strlen($value)) {
	return null;
	}

	diff --git a/src/applications/differential/field/DifferentialRevisionIDCommitMessageField.php b/src/applications/differential/field/DifferentialRevisionIDCommitMessageField.php
	--- a/src/applications/differential/field/DifferentialRevisionIDCommitMessageField.php
	+++ b/src/applications/differential/field/DifferentialRevisionIDCommitMessageField.php
	@@ -72,7 +72,7 @@
	}

	public function renderFieldValue($value) {
	- if (!strlen($value)) {
	+ if ($value === null \|\| !strlen($value)) {
	return null;
	}

	diff --git a/src/applications/differential/storage/DifferentialChangeset.php b/src/applications/differential/storage/DifferentialChangeset.php
	--- a/src/applications/differential/storage/DifferentialChangeset.php
	+++ b/src/applications/differential/storage/DifferentialChangeset.php
	@@ -325,7 +325,7 @@

	public function getOldStatePathVector() {
	$path = $this->getOldFile();
	- if (!strlen($path)) {
	+ if ($path === null \|\| !strlen($path)) {
	$path = $this->getFilename();
	}

	diff --git a/src/applications/differential/view/DifferentialRevisionUpdateHistoryView.php b/src/applications/differential/view/DifferentialRevisionUpdateHistoryView.php
	--- a/src/applications/differential/view/DifferentialRevisionUpdateHistoryView.php
	+++ b/src/applications/differential/view/DifferentialRevisionUpdateHistoryView.php
	@@ -251,6 +251,7 @@
	$content = phabricator_form(
	$this->getUser(),
	array(
	+ 'method' => 'GET',
	'action' => '/D'.$revision_id.'#toc',
	),
	array(
	diff --git a/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php
	--- a/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php
	+++ b/src/applications/diffusion/conduit/DiffusionBranchQueryConduitAPIMethod.php
	@@ -30,7 +30,7 @@
	$repository = $drequest->getRepository();

	$contains = $request->getValue('contains');
	- if (strlen($contains)) {
	+ if ($contains !== null && strlen($contains)) {

	// See PHI958 (and, earlier, PHI720). If "patterns" are provided, pass
	// them to "git branch ..." to let callers test for reachability from
	@@ -80,7 +80,7 @@
	->setRepository($repository);

	$contains = $request->getValue('contains');
	- if (strlen($contains)) {
	+ if ($contains !== null && strlen($contains)) {
	$query->withContainsCommit($contains);
	}

	diff --git a/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php
	--- a/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php
	+++ b/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php
	@@ -37,7 +37,7 @@
	$repository = $drequest->getRepository();

	$path = $request->getValue('path');
	- if (!strlen($path) \|\| $path === '/') {
	+ if ($path === null \|\| !strlen($path) \|\| $path === '/') {
	$path = null;
	}

	@@ -282,8 +282,13 @@

	$results = array();

	- $match_against = trim($path, '/');
	- $match_len = strlen($match_against);
	+ if ($path !== null) {
	+ $match_against = trim($path, '/');
	+ $match_len = strlen($match_against);
	+ } else {
	+ $match_against = '';
	+ $match_len = 0;
	+ }

	// For the root, don't trim. For other paths, trim the "/" after we match.
	// We need this because Mercurial's canonical paths have no leading "/",
	@@ -295,7 +300,7 @@
	if (strncmp($path, $match_against, $match_len)) {
	continue;
	}
	- if (!strlen($path)) {
	+ if ($path === null \|\| !strlen($path)) {
	continue;
	}
	$remainder = substr($path, $trim_len);
	diff --git a/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php
	--- a/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php
	+++ b/src/applications/diffusion/conduit/DiffusionHistoryQueryConduitAPIMethod.php
	@@ -45,16 +45,15 @@
	$repository = $drequest->getRepository();
	$commit_hash = $request->getValue('commit');
	$against_hash = $request->getValue('against');
	+ $offset = $request->getValue('offset');
	+ $limit = $request->getValue('limit');

	$path = $request->getValue('path');
	- if (!strlen($path)) {
	+ if ($path === null \|\| !strlen($path)) {
	$path = null;
	}

	- $offset = $request->getValue('offset');
	- $limit = $request->getValue('limit');
	-
	- if (strlen($against_hash)) {
	+ if ($against_hash !== null && strlen($against_hash)) {
	$commit_range = "{$against_hash}..{$commit_hash}";
	} else {
	$commit_range = $commit_hash;
	diff --git a/src/applications/diffusion/controller/DiffusionBranchTableController.php b/src/applications/diffusion/controller/DiffusionBranchTableController.php
	--- a/src/applications/diffusion/controller/DiffusionBranchTableController.php
	+++ b/src/applications/diffusion/controller/DiffusionBranchTableController.php
	@@ -26,7 +26,7 @@
	);

	$contains = $drequest->getSymbolicCommit();
	- if (strlen($contains)) {
	+ if ($contains !== null && strlen($contains)) {
	$params['contains'] = $contains;
	}

	diff --git a/src/applications/diffusion/controller/DiffusionBrowseController.php b/src/applications/diffusion/controller/DiffusionBrowseController.php
	--- a/src/applications/diffusion/controller/DiffusionBrowseController.php
	+++ b/src/applications/diffusion/controller/DiffusionBrowseController.php
	@@ -22,7 +22,7 @@
	// list.

	$grep = $request->getStr('grep');
	- if (strlen($grep)) {
	+ if (phutil_nonempty_string($grep)) {
	return $this->browseSearch();
	}

	@@ -290,6 +290,11 @@
	$header = $this->buildHeaderView($drequest);
	$header->setHeaderIcon('fa-folder-open');

	+ $title = '/';
	+ if ($drequest->getPath() !== null) {
	+ $title = nonempty(basename($drequest->getPath()), '/');
	+ }
	+
	$empty_result = null;
	$browse_panel = null;
	if (!$results->isValidResults()) {
	@@ -303,7 +308,6 @@
	->setPaths($results->getPaths())
	->setUser($request->getUser());

	- $title = nonempty(basename($drequest->getPath()), '/');
	$icon = 'fa-folder-open';
	$browse_header = $this->buildPanelHeaderView($title, $icon);

	@@ -351,7 +355,7 @@

	return $this->newPage()
	->setTitle(array(
	- nonempty(basename($drequest->getPath()), '/'),
	+ $title,
	$repository->getDisplayName(),
	))
	->setCrumbs($crumbs)
	diff --git a/src/applications/diffusion/controller/DiffusionCommitController.php b/src/applications/diffusion/controller/DiffusionCommitController.php
	--- a/src/applications/diffusion/controller/DiffusionCommitController.php
	+++ b/src/applications/diffusion/controller/DiffusionCommitController.php
	@@ -27,8 +27,11 @@

	// If this page is being accessed via "/source/xyz/commit/...", redirect
	// to the canonical URI.
	- $has_callsign = strlen($request->getURIData('repositoryCallsign'));
	- $has_id = strlen($request->getURIData('repositoryID'));
	+ $repo_callsign = $request->getURIData('repositoryCallsign');
	+ $has_callsign = $repo_callsign !== null && strlen($repo_callsign);
	+ $repo_id = $request->getURIData('repositoryID');
	+ $has_id = $repo_id !== null && strlen($repo_id);
	+
	if (!$has_callsign && !$has_id) {
	$canonical_uri = $repository->getCommitURI($commit_identifier);
	return id(new AphrontRedirectResponse())
	@@ -922,7 +925,7 @@

	private function linkBugtraq($corpus) {
	$url = PhabricatorEnv::getEnvConfig('bugtraq.url');
	- if (!strlen($url)) {
	+ if ($url === null \|\| !strlen($url)) {
	return $corpus;
	}

	diff --git a/src/applications/diffusion/controller/DiffusionController.php b/src/applications/diffusion/controller/DiffusionController.php
	--- a/src/applications/diffusion/controller/DiffusionController.php
	+++ b/src/applications/diffusion/controller/DiffusionController.php
	@@ -265,7 +265,10 @@

	protected function renderPathLinks(DiffusionRequest $drequest, $action) {
	$path = $drequest->getPath();
	- $path_parts = array_filter(explode('/', trim($path, '/')));
	+ $path_parts = array();
	+ if ($path !== null && strlen($path)) {
	+ $path_parts = array_filter(explode('/', trim($path, '/')));
	+ }

	$divider = phutil_tag(
	'span',
	diff --git a/src/applications/diffusion/controller/DiffusionHistoryController.php b/src/applications/diffusion/controller/DiffusionHistoryController.php
	--- a/src/applications/diffusion/controller/DiffusionHistoryController.php
	+++ b/src/applications/diffusion/controller/DiffusionHistoryController.php
	@@ -50,7 +50,8 @@
	// ancestors appropriately, but this would currrently be prohibitively
	// expensive in the general case.

	- $show_graph = !strlen($drequest->getPath());
	+ $show_graph = ($drequest->getPath() === null
	+ \|\| !strlen($drequest->getPath()));
	if ($show_graph) {
	$history_list
	->setParents($history_results['parents'])
	@@ -98,7 +99,7 @@
	$viewer = $this->getViewer();
	$repository = $drequest->getRepository();

	- $no_path = !strlen($drequest->getPath());
	+ $no_path = $drequest->getPath() === null \|\| !strlen($drequest->getPath());
	if ($no_path) {
	$header_text = pht('History');
	} else {
	diff --git a/src/applications/diffusion/controller/DiffusionRepositoryManagePanelsController.php b/src/applications/diffusion/controller/DiffusionRepositoryManagePanelsController.php
	--- a/src/applications/diffusion/controller/DiffusionRepositoryManagePanelsController.php
	+++ b/src/applications/diffusion/controller/DiffusionRepositoryManagePanelsController.php
	@@ -40,7 +40,7 @@
	}

	$selected = $request->getURIData('panel');
	- if (!strlen($selected)) {
	+ if ($selected === null \|\| !strlen($selected)) {
	$selected = head_key($panels);
	}

	diff --git a/src/applications/diffusion/controller/DiffusionServeController.php b/src/applications/diffusion/controller/DiffusionServeController.php
	--- a/src/applications/diffusion/controller/DiffusionServeController.php
	+++ b/src/applications/diffusion/controller/DiffusionServeController.php
	@@ -183,11 +183,13 @@
	// won't prompt users who provide a username but no password otherwise.
	// See T10797 for discussion.

	- $have_user = strlen(idx($_SERVER, 'PHP_AUTH_USER'));
	- $have_pass = strlen(idx($_SERVER, 'PHP_AUTH_PW'));
	+ $http_user = idx($_SERVER, 'PHP_AUTH_USER');
	+ $http_pass = idx($_SERVER, 'PHP_AUTH_PW');
	+ $have_user = $http_user !== null && strlen($http_user);
	+ $have_pass = $http_pass !== null && strlen($http_pass);
	if ($have_user && $have_pass) {
	- $username = $_SERVER['PHP_AUTH_USER'];
	- $password = new PhutilOpaqueEnvelope($_SERVER['PHP_AUTH_PW']);
	+ $username = $http_user;
	+ $password = new PhutilOpaqueEnvelope($http_pass);

	// Try Git LFS auth first since we can usually reject it without doing
	// any queries, since the username won't match the one we expect or the
	@@ -524,9 +526,15 @@
	break;
	case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
	$cmd = $request->getStr('cmd');
	+ if ($cmd === null) {
	+ return false;
	+ }
	if ($cmd == 'batch') {
	$cmds = idx($this->getMercurialArguments(), 'cmds');
	- return DiffusionMercurialWireProtocol::isReadOnlyBatchCommand($cmds);
	+ if ($cmds !== null) {
	+ return DiffusionMercurialWireProtocol::isReadOnlyBatchCommand(
	+ $cmds);
	+ }
	}
	return DiffusionMercurialWireProtocol::isReadOnlyCommand($cmd);
	case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
	diff --git a/src/applications/diffusion/controller/DiffusionTagListController.php b/src/applications/diffusion/controller/DiffusionTagListController.php
	--- a/src/applications/diffusion/controller/DiffusionTagListController.php
	+++ b/src/applications/diffusion/controller/DiffusionTagListController.php
	@@ -25,7 +25,9 @@
	'offset' => $pager->getOffset(),
	);

	- if (strlen($drequest->getSymbolicCommit())) {
	+ if ($drequest->getSymbolicCommit() !== null
	+ && strlen($drequest->getSymbolicCommit())) {
	+
	$is_commit = true;
	$params['commit'] = $drequest->getSymbolicCommit();
	} else {
	diff --git a/src/applications/diffusion/data/DiffusionCommitRef.php b/src/applications/diffusion/data/DiffusionCommitRef.php
	--- a/src/applications/diffusion/data/DiffusionCommitRef.php
	+++ b/src/applications/diffusion/data/DiffusionCommitRef.php
	@@ -131,6 +131,13 @@
	}

	private function formatUser($name, $email) {
	+ if ($name === null) {
	+ $name = '';
	+ }
	+ if ($email === null) {
	+ $email = '';
	+ }
	+
	if (strlen($name) && strlen($email)) {
	return "{$name} <{$email}>";
	} else if (strlen($email)) {
	diff --git a/src/applications/diffusion/document/DiffusionDocumentRenderingEngine.php b/src/applications/diffusion/document/DiffusionDocumentRenderingEngine.php
	--- a/src/applications/diffusion/document/DiffusionDocumentRenderingEngine.php
	+++ b/src/applications/diffusion/document/DiffusionDocumentRenderingEngine.php
	@@ -87,7 +87,7 @@
	$ref->setSymbolMetadata($this->getSymbolMetadata());

	$coverage = $drequest->loadCoverage();
	- if (strlen($coverage)) {
	+ if ($coverage !== null && strlen($coverage)) {
	$ref->addCoverage($coverage);
	}
	}
	diff --git a/src/applications/diffusion/engine/DiffusionCommitHookEngine.php b/src/applications/diffusion/engine/DiffusionCommitHookEngine.php
	--- a/src/applications/diffusion/engine/DiffusionCommitHookEngine.php
	+++ b/src/applications/diffusion/engine/DiffusionCommitHookEngine.php
	@@ -1133,7 +1133,7 @@
	->setHookWait(phutil_microseconds_since($hook_start));

	$identifier = $this->getRequestIdentifier();
	- if (strlen($identifier)) {
	+ if ($identifier !== null && strlen($identifier)) {
	$event->setRequestIdentifier($identifier);
	}

	diff --git a/src/applications/diffusion/query/DiffusionFileFutureQuery.php b/src/applications/diffusion/query/DiffusionFileFutureQuery.php
	--- a/src/applications/diffusion/query/DiffusionFileFutureQuery.php
	+++ b/src/applications/diffusion/query/DiffusionFileFutureQuery.php
	@@ -92,7 +92,10 @@

	$drequest = $this->getRequest();

	- $name = basename($drequest->getPath());
	+ $name = '';
	+ if ($drequest->getPath() !== null) {
	+ $name = basename($drequest->getPath());
	+ }
	$relative_ttl = phutil_units('48 hours in seconds');

	try {
	diff --git a/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialPathsQuery.php b/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialPathsQuery.php
	--- a/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialPathsQuery.php
	+++ b/src/applications/diffusion/query/lowlevel/DiffusionLowLevelMercurialPathsQuery.php
	@@ -32,8 +32,12 @@
	$hg_paths_command = 'locate --print0 --rev %s -I %s';
	}

	- $match_against = trim($path, '/');
	- $prefix = trim('./'.$match_against, '/');
	+ if ($path !== null) {
	+ $match_against = trim($path, '/');
	+ $prefix = trim('./'.$match_against, '/');
	+ } else {
	+ $prefix = '.';
	+ }
	list($entire_manifest) = $repository->execxLocalCommand(
	$hg_paths_command,
	hgsprintf('%s', $commit),
	diff --git a/src/applications/diffusion/query/pathid/DiffusionPathIDQuery.php b/src/applications/diffusion/query/pathid/DiffusionPathIDQuery.php
	--- a/src/applications/diffusion/query/pathid/DiffusionPathIDQuery.php
	+++ b/src/applications/diffusion/query/pathid/DiffusionPathIDQuery.php
	@@ -48,6 +48,10 @@
	*/
	public static function normalizePath($path) {

	+ if ($path === null) {
	+ return '/';
	+ }
	+
	// Normalize to single slashes, e.g. "///" => "/".
	$path = preg_replace('@[/]{2,}@', '/', $path);

	diff --git a/src/applications/diffusion/query/rawdiff/DiffusionGitRawDiffQuery.php b/src/applications/diffusion/query/rawdiff/DiffusionGitRawDiffQuery.php
	--- a/src/applications/diffusion/query/rawdiff/DiffusionGitRawDiffQuery.php
	+++ b/src/applications/diffusion/query/rawdiff/DiffusionGitRawDiffQuery.php
	@@ -35,7 +35,7 @@
	}

	$path = $drequest->getPath();
	- if (!strlen($path)) {
	+ if ($path === null \|\| !strlen($path)) {
	$path = '.';
	}

	diff --git a/src/applications/diffusion/request/DiffusionGitRequest.php b/src/applications/diffusion/request/DiffusionGitRequest.php
	--- a/src/applications/diffusion/request/DiffusionGitRequest.php
	+++ b/src/applications/diffusion/request/DiffusionGitRequest.php
	@@ -3,7 +3,7 @@
	final class DiffusionGitRequest extends DiffusionRequest {

	protected function isStableCommit($symbol) {
	- return preg_match('/^[a-f0-9]{40}\z/', $symbol);
	+ return $symbol !== null && preg_match('/^[a-f0-9]{40}\z/', $symbol);
	}

	public function getBranch() {
	diff --git a/src/applications/diffusion/request/DiffusionMercurialRequest.php b/src/applications/diffusion/request/DiffusionMercurialRequest.php
	--- a/src/applications/diffusion/request/DiffusionMercurialRequest.php
	+++ b/src/applications/diffusion/request/DiffusionMercurialRequest.php
	@@ -3,7 +3,7 @@
	final class DiffusionMercurialRequest extends DiffusionRequest {

	protected function isStableCommit($symbol) {
	- return preg_match('/^[a-f0-9]{40}\z/', $symbol);
	+ return $symbol !== null && preg_match('/^[a-f0-9]{40}\z/', $symbol);
	}

	public function getBranch() {
	diff --git a/src/applications/diffusion/request/DiffusionSvnRequest.php b/src/applications/diffusion/request/DiffusionSvnRequest.php
	--- a/src/applications/diffusion/request/DiffusionSvnRequest.php
	+++ b/src/applications/diffusion/request/DiffusionSvnRequest.php
	@@ -3,7 +3,7 @@
	final class DiffusionSvnRequest extends DiffusionRequest {

	protected function isStableCommit($symbol) {
	- return preg_match('/^[1-9]\d*\z/', $symbol);
	+ return $symbol !== null && preg_match('/^[1-9]\d*\z/', $symbol);
	}

	protected function didInitialize() {
	diff --git a/src/applications/diffusion/view/DiffusionBrowseTableView.php b/src/applications/diffusion/view/DiffusionBrowseTableView.php
	--- a/src/applications/diffusion/view/DiffusionBrowseTableView.php
	+++ b/src/applications/diffusion/view/DiffusionBrowseTableView.php
	@@ -15,9 +15,13 @@
	$repository = $request->getRepository();
	require_celerity_resource('diffusion-css');

	- $base_path = trim($request->getPath(), '/');
	- if ($base_path) {
	- $base_path = $base_path.'/';
	+ if ($request->getPath() !== null) {
	+ $base_path = trim($request->getPath(), '/');
	+ if ($base_path) {
	+ $base_path = $base_path.'/';
	+ }
	+ } else {
	+ $base_path = '';
	}

	$need_pull = array();
	diff --git a/src/applications/diffusion/view/DiffusionView.php b/src/applications/diffusion/view/DiffusionView.php
	--- a/src/applications/diffusion/view/DiffusionView.php
	+++ b/src/applications/diffusion/view/DiffusionView.php
	@@ -71,7 +71,7 @@
	$display_name = idx($details, 'name');
	unset($details['name']);

	- if (strlen($display_name)) {
	+ if ($display_name !== null && strlen($display_name)) {
	$display_name = phutil_tag(
	'span',
	array(
	diff --git a/src/applications/repository/editor/PhabricatorRepositoryEditor.php b/src/applications/repository/editor/PhabricatorRepositoryEditor.php
	--- a/src/applications/repository/editor/PhabricatorRepositoryEditor.php
	+++ b/src/applications/repository/editor/PhabricatorRepositoryEditor.php
	@@ -50,7 +50,7 @@
	// If the repository does not have a local path yet, assign it one based
	// on its ID. We can't do this earlier because we won't have an ID yet.
	$local_path = $object->getLocalPath();
	- if (!strlen($local_path)) {
	+ if ($local_path === null \|\| !strlen($local_path)) {
	$local_key = 'repository.default-local-path';

	$local_root = PhabricatorEnv::getEnvConfig($local_key);
	diff --git a/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php b/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php
	--- a/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php
	+++ b/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php
	@@ -238,7 +238,7 @@
	$identifier = $repository->getPHID();

	$instance = PhabricatorEnv::getEnvConfig('cluster.instance');
	- if (strlen($instance)) {
	+ if ($instance !== null && strlen($instance)) {
	$identifier = "{$identifier}:{$instance}";
	}

	@@ -575,7 +575,7 @@
	$ref_rules);

	// Empty repositories don't have any refs.
	- if (!strlen(rtrim($stdout))) {
	+ if ($stdout === null \|\| !strlen(rtrim($stdout))) {
	return array();
	}

	diff --git a/src/applications/repository/management/PhabricatorRepositoryManagementRebuildIdentitiesWorkflow.php b/src/applications/repository/management/PhabricatorRepositoryManagementRebuildIdentitiesWorkflow.php
	--- a/src/applications/repository/management/PhabricatorRepositoryManagementRebuildIdentitiesWorkflow.php
	+++ b/src/applications/repository/management/PhabricatorRepositoryManagementRebuildIdentitiesWorkflow.php
	@@ -220,7 +220,7 @@

	$committer_name = $data->getCommitterString();
	$committer_phid = $commit->getCommitterIdentityPHID();
	- if (strlen($committer_name)) {
	+ if (phutil_nonempty_string($committer_name)) {
	$committer_identity = $this->getIdentityForCommit(
	$commit,
	$committer_name);
	diff --git a/src/applications/repository/query/PhabricatorRepositoryRefCursorQuery.php b/src/applications/repository/query/PhabricatorRepositoryRefCursorQuery.php
	--- a/src/applications/repository/query/PhabricatorRepositoryRefCursorQuery.php
	+++ b/src/applications/repository/query/PhabricatorRepositoryRefCursorQuery.php
	@@ -132,7 +132,7 @@
	$name_hashes);
	}

	- if (strlen($this->datasourceQuery)) {
	+ if ($this->datasourceQuery !== null && strlen($this->datasourceQuery)) {
	$where[] = qsprintf(
	$conn,
	'refNameRaw LIKE %>',
	diff --git a/src/applications/repository/storage/PhabricatorRepository.php b/src/applications/repository/storage/PhabricatorRepository.php
	--- a/src/applications/repository/storage/PhabricatorRepository.php
	+++ b/src/applications/repository/storage/PhabricatorRepository.php
	@@ -345,7 +345,7 @@

	// Make some reasonable effort to produce reasonable default directory
	// names from repository names.
	- if (!strlen($name)) {
	+ if ($name === null \|\| !strlen($name)) {
	$name = $this->getName();
	$name = phutil_utf8_strtolower($name);
	$name = preg_replace('@[ -/:->]+@', '-', $name);
	@@ -721,14 +721,14 @@
	$head = idx($params, 'head');
	$against = idx($params, 'against');

	- if ($req_commit && !strlen($commit)) {
	+ if ($req_commit && ($commit === null \|\| !strlen($commit))) {
	throw new Exception(
	pht(
	'Diffusion URI action "%s" requires commit!',
	$action));
	}

	- if ($req_branch && !strlen($branch)) {
	+ if ($req_branch && ($branch === null \|\| !strlen($branch))) {
	throw new Exception(
	pht(
	'Diffusion URI action "%s" requires branch!',
	@@ -779,20 +779,20 @@
	break;
	case 'compare':
	$uri = $this->getPathURI("/{$action}/");
	- if (strlen($head)) {
	+ if ($head !== null && strlen($head)) {
	$query['head'] = $head;
	- } else if (strlen($raw_commit)) {
	+ } else if ($raw_commit !== null && strlen($raw_commit)) {
	$query['commit'] = $raw_commit;
	- } else if (strlen($raw_branch)) {
	+ } else if ($raw_branch !== null && strlen($raw_branch)) {
	$query['head'] = $raw_branch;
	}

	- if (strlen($against)) {
	+ if ($against !== null && strlen($against)) {
	$query['against'] = $against;
	}
	break;
	case 'branch':
	- if (strlen($path)) {
	+ if ($path != null && strlen($path)) {
	$uri = $this->getPathURI("/repository/{$path}");
	} else {
	$uri = $this->getPathURI('/');
	@@ -1160,7 +1160,7 @@
	*/
	public function getRemoteURIObject() {
	$raw_uri = $this->getDetail('remote-uri');
	- if (!strlen($raw_uri)) {
	+ if ($raw_uri === null \|\| !strlen($raw_uri)) {
	return new PhutilURI('');
	}

	@@ -2818,7 +2818,7 @@
	$permanent_rules = $this->getStringListForConduit($permanent_rules);

	$default_branch = $this->getDefaultBranch();
	- if (!strlen($default_branch)) {
	+ if ($default_branch === null \|\| !strlen($default_branch)) {
	$default_branch = null;
	}

	diff --git a/src/applications/repository/storage/PhabricatorRepositoryCommit.php b/src/applications/repository/storage/PhabricatorRepositoryCommit.php
	--- a/src/applications/repository/storage/PhabricatorRepositoryCommit.php
	+++ b/src/applications/repository/storage/PhabricatorRepositoryCommit.php
	@@ -478,7 +478,7 @@
	}

	$author = $this->getRawAuthorStringForDisplay();
	- if (strlen($author)) {
	+ if ($author !== null && strlen($author)) {
	return DiffusionView::renderName($author);
	}

	@@ -493,7 +493,7 @@
	}

	$committer = $this->getRawCommitterStringForDisplay();
	- if (strlen($committer)) {
	+ if ($committer !== null && strlen($committer)) {
	return DiffusionView::renderName($committer);
	}

	diff --git a/src/applications/repository/storage/PhabricatorRepositoryCommitData.php b/src/applications/repository/storage/PhabricatorRepositoryCommitData.php
	--- a/src/applications/repository/storage/PhabricatorRepositoryCommitData.php
	+++ b/src/applications/repository/storage/PhabricatorRepositoryCommitData.php
	@@ -97,7 +97,7 @@
	$ref = $this->getCommitRef();

	$author = $ref->getAuthor();
	- if (strlen($author)) {
	+ if ($author !== null && strlen($author)) {
	return $author;
	}

	@@ -131,7 +131,7 @@
	$ref = $this->getCommitRef();

	$committer = $ref->getCommitter();
	- if (strlen($committer)) {
	+ if ($committer !== null && strlen($committer)) {
	return $committer;
	}

	diff --git a/src/applications/repository/storage/PhabricatorRepositoryPushLog.php b/src/applications/repository/storage/PhabricatorRepositoryPushLog.php
	--- a/src/applications/repository/storage/PhabricatorRepositoryPushLog.php
	+++ b/src/applications/repository/storage/PhabricatorRepositoryPushLog.php
	@@ -158,6 +158,9 @@
	}

	public function getRefName() {
	+ if ($this->getRefNameRaw() === null) {
	+ return null;
	+ }
	return $this->getUTF8StringFromStorage(
	$this->getRefNameRaw(),
	$this->getRefNameEncoding());
	@@ -175,6 +178,9 @@
	if ($this->getRepository()->isSVN()) {
	return $this->getRefOld();
	}
	+ if ($this->getRefOld() === null) {
	+ return null;
	+ }
	return substr($this->getRefOld(), 0, 12);
	}

	diff --git a/src/applications/repository/storage/PhabricatorRepositoryURI.php b/src/applications/repository/storage/PhabricatorRepositoryURI.php
	--- a/src/applications/repository/storage/PhabricatorRepositoryURI.php
	+++ b/src/applications/repository/storage/PhabricatorRepositoryURI.php
	@@ -752,7 +752,7 @@
	// without requiring an index rebuild.

	$ssh_host = PhabricatorEnv::getEnvConfig('diffusion.ssh-host');
	- if (strlen($ssh_host)) {
	+ if ($ssh_host !== null && strlen($ssh_host)) {
	$domain_map['<ssh-host>'] = $ssh_host;
	}

	diff --git a/src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php b/src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php
	--- a/src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php
	+++ b/src/applications/repository/worker/commitmessageparser/PhabricatorRepositoryCommitMessageParserWorker.php
	@@ -36,7 +36,7 @@

	$author = $ref->getAuthor();
	$committer = $ref->getCommitter();
	- $has_committer = (bool)strlen($committer);
	+ $has_committer = $committer !== null && (bool)strlen($committer);

	$identity_engine = id(new DiffusionRepositoryIdentityEngine())
	->setViewer($viewer)
	diff --git a/src/applications/settings/panel/PhabricatorExternalEditorSettingsPanel.php b/src/applications/settings/panel/PhabricatorExternalEditorSettingsPanel.php
	--- a/src/applications/settings/panel/PhabricatorExternalEditorSettingsPanel.php
	+++ b/src/applications/settings/panel/PhabricatorExternalEditorSettingsPanel.php
	@@ -39,7 +39,7 @@
	$viewer = $this->getViewer();
	$pattern = $viewer->getUserSetting(PhabricatorEditorSetting::SETTINGKEY);

	- if (!strlen($pattern)) {
	+ if ($pattern === null \|\| !strlen($pattern)) {
	return null;
	}

	diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
	--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
	+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
	@@ -2363,7 +2363,9 @@
	// Here, we don't care about processing only new mentions after an edit
	// because there is no way for an object to ever "unmention" itself on
	// another object, so we can ignore the old value.
	- $engine->markupText($change->getNewValue());
	+ if ($change->getNewValue() !== null) {
	+ $engine->markupText($change->getNewValue());
	+ }

	$mentioned_phids += $engine->getTextMetadata(
	PhabricatorObjectRemarkupRule::KEY_MENTIONED_OBJECTS,
	diff --git a/src/infrastructure/contentsource/PhabricatorUnknownContentSource.php b/src/infrastructure/contentsource/PhabricatorUnknownContentSource.php
	--- a/src/infrastructure/contentsource/PhabricatorUnknownContentSource.php
	+++ b/src/infrastructure/contentsource/PhabricatorUnknownContentSource.php
	@@ -7,7 +7,7 @@

	public function getSourceName() {
	$source = $this->getSource();
	- if (strlen($source)) {
	+ if ($source !== null && strlen($source)) {
	return pht('Unknown ("%s")', $source);
	} else {
	return pht('Unknown');
	diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldRemarkup.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldRemarkup.php
	--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldRemarkup.php
	+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldRemarkup.php
	@@ -30,7 +30,7 @@
	public function renderPropertyViewValue(array $handles) {
	$value = $this->getFieldValue();

	- if (!strlen($value)) {
	+ if ($value === null \|\| !strlen($value)) {
	return null;
	}

	diff --git a/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php b/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php
	--- a/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php
	+++ b/src/infrastructure/diff/view/PHUIDiffTableOfContentsItemView.php
	@@ -139,7 +139,7 @@
	$not_applicable = '-';

	$coverage = $this->getCoverage();
	- if (!strlen($coverage)) {
	+ if ($coverage === null \|\| !strlen($coverage)) {
	return $not_applicable;
	}

	@@ -157,7 +157,7 @@
	$not_applicable = '-';

	$coverage = $this->getCoverage();
	- if (!strlen($coverage)) {
	+ if ($coverage === null \|\| !strlen($coverage)) {
	return $not_applicable;
	}

	diff --git a/src/infrastructure/editor/PhabricatorEditorURIEngine.php b/src/infrastructure/editor/PhabricatorEditorURIEngine.php
	--- a/src/infrastructure/editor/PhabricatorEditorURIEngine.php
	+++ b/src/infrastructure/editor/PhabricatorEditorURIEngine.php
	@@ -16,7 +16,7 @@

	$pattern = $viewer->getUserSetting(PhabricatorEditorSetting::SETTINGKEY);

	- if (!strlen(trim($pattern))) {
	+ if ($pattern === null \|\| !strlen(trim($pattern))) {
	return null;
	}

	diff --git a/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php b/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
	--- a/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
	+++ b/src/infrastructure/storage/lisk/PhabricatorLiskDAO.php
	@@ -42,7 +42,7 @@
	if (!strlen($namespace)) {
	$namespace = self::getDefaultStorageNamespace();
	}
	- if (!strlen($namespace)) {
	+ if ($namespace === null \|\| !strlen($namespace)) {
	throw new Exception(pht('No storage namespace configured!'));
	}
	return $namespace;
	@@ -295,7 +295,7 @@
	}

	if (function_exists('mb_detect_encoding')) {
	- if (strlen($encoding)) {
	+ if ($encoding !== null && strlen($encoding)) {
	$try_encodings = array(
	$encoding,
	);
	diff --git a/src/view/phui/PHUIPagerView.php b/src/view/phui/PHUIPagerView.php
	--- a/src/view/phui/PHUIPagerView.php
	+++ b/src/view/phui/PHUIPagerView.php
	@@ -50,7 +50,12 @@
	public function readFromRequest(AphrontRequest $request) {
	$this->uri = $request->getRequestURI();
	$this->pagingParameter = 'offset';
	- $this->offset = $request->getInt($this->pagingParameter);
	+
	+ $offset = $request->getInt($this->pagingParameter);
	+ if ($offset === null) {
	+ $offset = 0;
	+ }
	+ $this->offset = $offset;
	return $this;
	}

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