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diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -2511,6 +2511,7 @@
'PhabricatorStorageManagementDumpWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementDumpWorkflow.php',
'PhabricatorStorageManagementProbeWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementProbeWorkflow.php',
'PhabricatorStorageManagementQuickstartWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementQuickstartWorkflow.php',
+ 'PhabricatorStorageManagementRenamespaceWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementRenamespaceWorkflow.php',
'PhabricatorStorageManagementShellWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementShellWorkflow.php',
'PhabricatorStorageManagementStatusWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementStatusWorkflow.php',
'PhabricatorStorageManagementUpgradeWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementUpgradeWorkflow.php',
@@ -5870,6 +5871,7 @@
'PhabricatorStorageManagementDumpWorkflow' => 'PhabricatorStorageManagementWorkflow',
'PhabricatorStorageManagementProbeWorkflow' => 'PhabricatorStorageManagementWorkflow',
'PhabricatorStorageManagementQuickstartWorkflow' => 'PhabricatorStorageManagementWorkflow',
+ 'PhabricatorStorageManagementRenamespaceWorkflow' => 'PhabricatorStorageManagementWorkflow',
'PhabricatorStorageManagementShellWorkflow' => 'PhabricatorStorageManagementWorkflow',
'PhabricatorStorageManagementStatusWorkflow' => 'PhabricatorStorageManagementWorkflow',
'PhabricatorStorageManagementUpgradeWorkflow' => 'PhabricatorStorageManagementWorkflow',
diff --git a/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementRenamespaceWorkflow.php b/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementRenamespaceWorkflow.php
new file mode 100644
--- /dev/null
+++ b/src/infrastructure/storage/management/workflow/PhabricatorStorageManagementRenamespaceWorkflow.php
@@ -0,0 +1,94 @@
+<?php
+
+final class PhabricatorStorageManagementRenamespaceWorkflow
+ extends PhabricatorStorageManagementWorkflow {
+
+ protected function didConstruct() {
+ $this
+ ->setName('renamespace')
+ ->setExamples(
+ '**renamespace** [__options__] '.
+ '--in __dump.sql__ --from __old__ --to __new__ > __out.sql__')
+ ->setSynopsis(pht('Change the database namespace of a .sql dump file.'))
+ ->setArguments(
+ array(
+ array(
+ 'name' => 'in',
+ 'param' => 'file',
+ 'help' => pht('SQL dumpfile to process.'),
+ ),
+ array(
+ 'name' => 'from',
+ 'param' => 'namespace',
+ 'help' => pht('Current database namespace used by dumpfile.'),
+ ),
+ array(
+ 'name' => 'to',
+ 'param' => 'namespace',
+ 'help' => pht('Desired database namespace for output.'),
+ ),
+ ));
+ }
+
+ public function execute(PhutilArgumentParser $args) {
+ $console = PhutilConsole::getConsole();
+
+ $in = $args->getArg('in');
+ if (!strlen($in)) {
+ throw new PhutilArgumentUsageException(
+ pht('Specify the dumpfile to read with --in.'));
+ }
+
+ $from = $args->getArg('from');
+ if (!strlen($from)) {
+ throw new PhutilArgumentUsageException(
+ pht('Specify namespace to rename from with --from.'));
+ }
+
+ $to = $args->getArg('to');
+ if (!strlen($to)) {
+ throw new PhutilArgumentUsageException(
+ pht('Specify namespace to rename to with --to.'));
+ }
+
+ $patterns = array(
+ 'use' => '@^(USE `)([^_]+)(_.*)$@',
+ 'create' => '@^(CREATE DATABASE /\*.*?\*/ `)([^_]+)(_.*)$@',
+ );
+
+ $found = array_fill_keys(array_keys($patterns), 0);
+
+ $matches = null;
+ foreach (new LinesOfALargeFile($in) as $line) {
+
+ foreach ($patterns as $key => $pattern) {
+ if (preg_match($pattern, $line, $matches)) {
+ $namespace = $matches[2];
+ if ($namespace != $from) {
+ throw new Exception(
+ pht(
+ 'Expected namespace "%s", found "%s": %s.',
+ $from,
+ $namespace,
+ $line));
+ }
+
+ $line = $matches[1].$to.$matches[3];
+ $found[$key]++;
+ }
+ }
+
+ echo $line."\n";
+ }
+
+ // Give the user a chance to catch things if the results are crazy.
+ $console->writeErr(
+ pht(
+ 'Adjusted **%s** create statements and **%s** use statements.',
+ new PhutilNumber($found['create']),
+ new PhutilNumber($found['use']))."\n");
+
+ return 0;
+ }
+
+}

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