diff --git a/src/moduleutils/PhutilLibraryMapBuilder.php b/src/moduleutils/PhutilLibraryMapBuilder.php
--- a/src/moduleutils/PhutilLibraryMapBuilder.php
+++ b/src/moduleutils/PhutilLibraryMapBuilder.php
@@ -12,7 +12,6 @@
 final class PhutilLibraryMapBuilder extends Phobject {
 
   private $root;
-  private $quiet = true;
   private $subprocessLimit = 8;
 
   private $fileSymbolMap;
@@ -38,19 +37,6 @@
     $this->root = $root;
   }
 
-  /**
-   * Control status output. Use `--quiet` to set this.
-   *
-   * @param  bool  If true, don't show status output.
-   * @return this
-   *
-   * @task map
-   */
-  public function setQuiet($quiet) {
-    $this->quiet = $quiet;
-    return $this;
-  }
-
   /**
    * Control subprocess parallelism limit. Use `--limit` to set this.
    *
@@ -108,25 +94,9 @@
   public function buildAndWriteMap() {
     $library_map = $this->buildMap();
 
-    $this->log(pht('Writing map...'));
     $this->writeLibraryMap($library_map);
   }
 
-  /**
-   * Write a status message to the user, if not running in quiet mode.
-   *
-   * @param  string  Message to write.
-   * @return this
-   *
-   * @task map
-   */
-  private function log($message) {
-    if (!$this->quiet) {
-      @fwrite(STDERR, "%s\n", $message);
-    }
-    return $this;
-  }
-
 
 /* -(  Path Management  )---------------------------------------------------- */
 
@@ -236,11 +206,7 @@
     }
 
     $json = json_encode($cache);
-    try {
-      Filesystem::writeFile($cache_file, $json);
-    } catch (FilesystemException $ex) {
-      $this->log(pht('Unable to save the cache!'));
-    }
+    Filesystem::writeFile($cache_file, $json);
   }
 
   /**
@@ -251,7 +217,6 @@
    * @task symbol
    */
   public function dropSymbolCache() {
-    $this->log(pht('Dropping symbol cache...'));
     Filesystem::remove($this->getPathForSymbolCache());
   }
 
@@ -451,14 +416,10 @@
    */
   private function analyzeLibrary() {
     // Identify all the ".php" source files in the library.
-    $this->log(pht('Finding source files...'));
     $source_map = $this->loadSourceFileMap();
-    $this->log(
-      pht('Found %s files.', new PhutilNumber(count($source_map))));
 
     // Load the symbol cache with existing parsed symbols. This allows us
     // to remap libraries quickly by analyzing only changed files.
-    $this->log(pht('Loading symbol cache...'));
     $symbol_cache = $this->loadSymbolCache();
 
     // If the XHPAST binary is not up-to-date, build it now. Otherwise,
@@ -481,23 +442,12 @@
       }
       $futures[$file] = $this->buildSymbolAnalysisFuture($file);
     }
-    $this->log(
-      pht('Found %s files in cache.', new PhutilNumber(count($symbol_map))));
 
     // Run the analyzer on any files which need analysis.
     if ($futures) {
       $limit = $this->subprocessLimit;
 
-      $this->log(
-        pht(
-          'Analyzing %s file(s) with %s subprocess(es)...',
-          phutil_count($futures),
-          new PhutilNumber($limit)));
-
       $progress = new PhutilConsoleProgressBar();
-      if ($this->quiet) {
-        $progress->setQuiet(true);
-      }
       $progress->setTotal(count($futures));
 
       $futures = id(new FutureIterator($futures))
@@ -525,8 +475,6 @@
     $this->writeSymbolCache($symbol_map, $source_map);
 
     // Our map is up to date, so either show it on stdout or write it to disk.
-    $this->log(pht('Building library map...'));
-
     $this->librarySymbolMap = $this->buildLibraryMap($symbol_map);
   }
 
diff --git a/src/workflow/ArcanistLiberateWorkflow.php b/src/workflow/ArcanistLiberateWorkflow.php
--- a/src/workflow/ArcanistLiberateWorkflow.php
+++ b/src/workflow/ArcanistLiberateWorkflow.php
@@ -79,22 +79,35 @@
       );
     }
 
+    $any_errors = false;
     foreach ($paths as $path) {
       $log->writeStatus(
         pht('WORK'),
         pht(
           'Updating library: %s',
           Filesystem::readablePath($path).DIRECTORY_SEPARATOR));
-      $this->liberatePath($path);
+      $exit_code = $this->liberatePath($path);
+      if ($exit_code !== 0) {
+        $any_errors = true;
+        $log->writeError(
+          pht('ERROR'),
+          pht('Failed to update library: %s', $path));
+      }
     }
 
-    $log->writeSuccess(
-      pht('DONE'),
-      pht('Updated %s librarie(s).', phutil_count($paths)));
+    if (!$any_errors) {
+      $log->writeSuccess(
+        pht('DONE'),
+        pht('Updated %s librarie(s).', phutil_count($paths)));
+    }
 
     return 0;
   }
 
+  /**
+   * @return  int The exit code of running the rebuild-map.php script, which
+   *              will be 0 to indicate success or non-zero for failure.
+   */
   private function liberatePath($path) {
     if (!Filesystem::pathExists($path.'/__phutil_library_init__.php')) {
       echo tsprintf(
@@ -103,8 +116,7 @@
           'No library currently exists at the path "%s"...',
           $path));
       $this->liberateCreateDirectory($path);
-      $this->liberateCreateLibrary($path);
-      return;
+      return $this->liberateCreateLibrary($path);
     }
 
     $version = $this->getLibraryFormatVersion($path);
@@ -119,8 +131,6 @@
         throw new ArcanistUsageException(
           pht("Unknown library version '%s'!", $version));
     }
-
-    echo tsprintf("%s\n", pht('Done.'));
   }
 
   private function getLibraryFormatVersion($path) {
@@ -140,6 +150,10 @@
     return 1;
   }
 
+  /**
+   * @return  int The exit code of running the rebuild-map.php script, which
+   *              will be 0 to indicate success or non-zero for failure.
+   */
   private function liberateVersion2($path) {
     $bin = $this->getScriptPath('support/lib/rebuild-map.php');
 
@@ -181,10 +195,14 @@
     execx('mkdir -p %R', $path);
   }
 
+  /**
+   * @return  int The exit code of running the rebuild-map.php script, which
+   *              will be 0 to indicate success or non-zero for failure.
+   */
   private function liberateCreateLibrary($path) {
     $init_path = $path.'/__phutil_library_init__.php';
     if (Filesystem::pathExists($init_path)) {
-      return;
+      return 0;
     }
 
     echo pht("Creating new libphutil library in '%s'.", $path)."\n";
@@ -213,7 +231,7 @@
       '__phutil_library_init__.php',
       $path);
     Filesystem::writeFile($init_path, $template);
-    $this->liberateVersion2($path);
+    return $this->liberateVersion2($path);
   }
 
 
diff --git a/support/lib/rebuild-map.php b/support/lib/rebuild-map.php
--- a/support/lib/rebuild-map.php
+++ b/support/lib/rebuild-map.php
@@ -16,10 +16,6 @@
 $args->parseStandardArguments();
 $args->parse(
   array(
-    array(
-      'name'      => 'quiet',
-      'help'      => pht('Do not write status messages to stderr.'),
-    ),
     array(
       'name'      => 'drop-cache',
       'help'      => pht(
@@ -56,7 +52,6 @@
 $root = Filesystem::resolvePath(head($root));
 
 $builder = new PhutilLibraryMapBuilder($root);
-$builder->setQuiet($args->getArg('quiet'));
 $builder->setSubprocessLimit($args->getArg('limit'));
 
 if ($args->getArg('drop-cache')) {