diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 4811d8c6..8d49e238 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -52,6 +52,7 @@ phutil_register_library_map(array(
     'ArcanistPhutilTestTerminatedException' => 'unit/engine/phutil/testcase/exception',
     'ArcanistRepositoryAPI' => 'repository/api/base',
     'ArcanistSubversionAPI' => 'repository/api/subversion',
+    'ArcanistSvnHookPreCommitWorkflow' => 'workflow/svn-hook-pre-commit',
     'ArcanistTextLinter' => 'lint/linter/text',
     'ArcanistUnitTestResult' => 'unit/result',
     'ArcanistUnitWorkflow' => 'workflow/unit',
@@ -92,6 +93,7 @@ phutil_register_library_map(array(
     'ArcanistPatchWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistPhutilModuleLinter' => 'ArcanistLinter',
     'ArcanistSubversionAPI' => 'ArcanistRepositoryAPI',
+    'ArcanistSvnHookPreCommitWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistTextLinter' => 'ArcanistLinter',
     'ArcanistUnitWorkflow' => 'ArcanistBaseWorkflow',
     'ArcanistUserAbortException' => 'ArcanistUsageException',
diff --git a/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php b/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php
index dea80168..47bcf20b 100644
--- a/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php
+++ b/src/workflow/git-hook-pre-receive/ArcanistGitHookPreReceiveWorkflow.php
@@ -22,7 +22,7 @@ class ArcanistGitHookPreReceiveWorkflow extends ArcanistBaseWorkflow {
     return phutil_console_format(<<<EOTEXT
       **git-hook-pre-receive**
           Supports: git
-          You can install this as a git pre-recieve hook.
+          You can install this as a git pre-receive hook.
 EOTEXT
       );
   }
diff --git a/src/workflow/svn-hook-pre-commit/ArcanistSvnHoookPreCommitWorkflow.php b/src/workflow/svn-hook-pre-commit/ArcanistSvnHoookPreCommitWorkflow.php
new file mode 100644
index 00000000..2e13768d
--- /dev/null
+++ b/src/workflow/svn-hook-pre-commit/ArcanistSvnHoookPreCommitWorkflow.php
@@ -0,0 +1,172 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class ArcanistSvnHookPreCommitWorkflow extends ArcanistBaseWorkflow {
+
+  public function getCommandHelp() {
+    return phutil_console_format(<<<EOTEXT
+      **svn-hook-pre-receive** __repository__ __transaction__
+          Supports: svn
+          You can install this as an SVN pre-commit hook.
+EOTEXT
+      );
+  }
+
+  public function getArguments() {
+    return array(
+      '*' => 'svnargs',
+    );
+  }
+
+  public function run() {
+
+    $svnargs = $this->getArgument('svnargs');
+    $repository = $svnargs[0];
+    $transaction = $svnargs[1];
+
+    list($commit_message) = execx(
+      'svnlook log --transaction %s %s',
+      $transaction,
+      $repository);
+
+    // TODO: Do stuff with commit message.
+    var_dump($commit_message);
+    
+    list($changed) = execx(
+      'svnlook changed --transaction %s %s',
+      $transaction,
+      $repository);
+      
+    $paths = array();
+    $changed = explode("\n", trim($changed));
+    foreach ($changed as $line) {
+      $matches = null;
+      preg_match('/^..\s*(.*)$/', $line, $matches);
+      $paths[$matches[1]] = strlen($matches[1]);
+    }
+    
+    $resolved = array();
+    $failed = array();
+    $missing = array();
+    $found = array();
+    asort($paths);
+    
+    foreach ($paths as $path => $length) {
+      foreach ($resolved as $rpath => $root) {
+        if (!strncmp($path, $rpath, strlen($rpath))) {
+          $resolved[$path] = $root;
+          continue 2;
+        }
+      }
+      $config = $path;
+      
+      if (basename($config) == '.arcconfig') {
+        $resolved[$config] = $config;
+        continue;
+      }
+      
+      $config = rtrim($config, '/');
+      $last_config = $config;
+      do {
+        if (!empty($missing[$config])) {
+          break;
+        } else if (!empty($found[$config])) {
+          $resolved[$path] = $found[$config];
+          break;
+        }
+        list($err) = exec_manual(
+          'svnlook cat --transaction %s %s %s',
+          $transaction,
+          $repository,
+          $config ? $config.'/.arcconfig' : '.arcconfig');
+        if ($err) {
+          $missing[$path] = true;
+        } else {
+          $resolved[$path] = $config ? $config.'/.arcconfig' : '.arcconfig';
+          $found[$config] = $resolved[$path];
+        }
+        $config = dirname($config);
+        if ($config == '.') {
+          $config = '';
+        }
+        if ($config == $last_config) {
+          break;
+        }
+        $last_config = $config;
+      } while (true);
+      
+      if (empty($resolved[$path])) {
+        $failed[] = $path;
+      }
+    }
+    
+    if ($failed && $resolved) {
+      $failed_paths = '        '.implode("\n        ", $failed);
+      $resolved_paths = '        '.implode("\n        ", array_keys($resolved));
+      throw new ArcanistUsageException(
+        "This commit includes a mixture of files in Arcanist projects and ".
+        "outside of Arcanist projects. A commit which affects an Arcanist ".
+        "project must affect only that project.\n\n".
+        "Files in projects:\n\n".
+        $resolved_paths."\n\n".
+        "Files not in projects:\n\n".
+        $failed_paths);
+    }
+    
+    if (!$resolved) {
+      // None of the affected paths are beneath a .arcconfig file.
+      return 3;
+    }
+    
+    $groups = array();
+    foreach ($resolved as $path => $project) {
+      $groups[$project][] = $path;
+    }
+    if (count($groups) > 1) {
+      $message = array();
+      foreach ($groups as $config => $group) {
+        $message[] = "Files underneath '{$config}':\n\n";
+        $message[] = "        ".implode("\n        ", $group)."\n\n";
+      }
+      $message = implode('', $message);
+      throw new ArcanistUsageException(
+        "This commit includes a mixture of files from different Arcanist ".
+        "projects. A commit which affects an Arcanist project must affect ".
+        "only that project.\n\n".
+        $message);
+    }
+    
+    $project_root = key($groups);
+    $paths = reset($groups);
+    
+    $data = array();
+    foreach ($paths as $path) {
+      list($err, $filedata) = exec_manual(
+        'svnlook cat --transaction %s %s %s',
+        $transaction,
+        $repository,
+        $path);
+      $data[$path] = $err ? null : $filedata;
+    }
+    
+    // TODO: Do stuff with data.
+    var_dump($data);
+
+    return 1;
+  }
+}
diff --git a/src/workflow/svn-hook-pre-commit/__init__.php b/src/workflow/svn-hook-pre-commit/__init__.php
new file mode 100644
index 00000000..921b10ec
--- /dev/null
+++ b/src/workflow/svn-hook-pre-commit/__init__.php
@@ -0,0 +1,15 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('arcanist', 'workflow/base');
+
+phutil_require_module('phutil', 'console');
+phutil_require_module('phutil', 'future/exec');
+
+
+phutil_require_source('ArcanistSvnHoookPreCommitWorkflow.php');