diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -9,7 +9,7 @@
   'names' => array(
     'conpherence.pkg.css' => '3c8a0668',
     'conpherence.pkg.js' => '020aebcf',
-    'core.pkg.css' => '5edb4679',
+    'core.pkg.css' => '7ef29af5',
     'core.pkg.js' => '705aec2c',
     'differential.pkg.css' => '607c84be',
     'differential.pkg.js' => '1b97518d',
@@ -31,7 +31,7 @@
     'rsrc/css/aphront/panel-view.css' => '46923d46',
     'rsrc/css/aphront/phabricator-nav-view.css' => 'f8a0c1bf',
     'rsrc/css/aphront/table-view.css' => '0bb61df1',
-    'rsrc/css/aphront/tokenizer.css' => 'b52d0668',
+    'rsrc/css/aphront/tokenizer.css' => '34e2a838',
     'rsrc/css/aphront/tooltip.css' => 'e3f2412f',
     'rsrc/css/aphront/typeahead-browse.css' => 'b7ed02d2',
     'rsrc/css/aphront/typeahead.css' => '8779483d',
@@ -537,7 +537,7 @@
     'aphront-multi-column-view-css' => 'fbc00ba3',
     'aphront-panel-view-css' => '46923d46',
     'aphront-table-view-css' => '0bb61df1',
-    'aphront-tokenizer-control-css' => 'b52d0668',
+    'aphront-tokenizer-control-css' => '34e2a838',
     'aphront-tooltip-css' => 'e3f2412f',
     'aphront-typeahead-control-css' => '8779483d',
     'application-search-view-css' => '0f7c06d8',
@@ -1220,6 +1220,10 @@
       'javelin-stratcom',
       'javelin-workflow',
     ),
+    '34e2a838' => array(
+      'aphront-typeahead-control-css',
+      'phui-tag-view-css',
+    ),
     '37b8a04a' => array(
       'javelin-install',
       'javelin-util',
@@ -1945,10 +1949,6 @@
     'b517bfa0' => array(
       'phui-oi-list-view-css',
     ),
-    'b52d0668' => array(
-      'aphront-typeahead-control-css',
-      'phui-tag-view-css',
-    ),
     'b58d1a2a' => array(
       'javelin-behavior',
       'javelin-behavior-device',
diff --git a/src/applications/diffusion/query/lowlevel/DiffusionLowLevelCommitQuery.php b/src/applications/diffusion/query/lowlevel/DiffusionLowLevelCommitQuery.php
--- a/src/applications/diffusion/query/lowlevel/DiffusionLowLevelCommitQuery.php
+++ b/src/applications/diffusion/query/lowlevel/DiffusionLowLevelCommitQuery.php
@@ -41,8 +41,19 @@
   private function loadGitCommitRef() {
     $repository = $this->getRepository();
 
-    // NOTE: %B was introduced somewhat recently in git's history, so pull
-    // commit message information with %s and %b instead.
+    // See T5028. The "%B" (raw body) mode is not present in very old versions
+    // of Git. Use "%s" and "%b" ("subject" and "wrapped body") as an
+    // approximation.
+
+    $git_binary = PhutilBinaryAnalyzer::getForBinary('git');
+    $git_version = $git_binary->getBinaryVersion();
+    if (version_compare($git_version, '1.7.2', '>=')) {
+      $body_format = '%B';
+      $split_body = false;
+    } else {
+      $body_format = '%s%x00%b';
+      $split_body = true;
+    }
 
     // Even though we pass --encoding here, git doesn't always succeed, so
     // we try a little harder, since git *does* tell us what the actual encoding
@@ -52,7 +63,22 @@
       'UTF-8',
       implode(
         '%x00',
-        array('%e', '%cn', '%ce', '%an', '%ae', '%T', '%at', '%s%n%n%b')),
+        array(
+          '%e',
+          '%cn',
+          '%ce',
+          '%an',
+          '%ae',
+          '%T',
+          '%at',
+          $body_format,
+
+          // The "git log" output includes a trailing newline. We want to
+          // faithfully capture only the exact text of the commit message,
+          // so include an explicit terminator: this makes sure the exact
+          // body text is surrounded by "\0" characters.
+          '~',
+        )),
       $this->identifier);
 
     $parts = explode("\0", $info);
@@ -82,6 +108,28 @@
       $author_epoch = null;
     }
 
+    if ($split_body) {
+      // Here, the body is: "subject", "\0", "wrapped body". Stitch the
+      // pieces back together by putting a newline between them if both
+      // parts are nonempty.
+
+      $head = $parts[6];
+      $tail = $parts[7];
+
+      if (strlen($head) && strlen($tail)) {
+        $body = $head."\n\n".$tail;
+      } else if (strlen($head)) {
+        $body = $head;
+      } else if (strlen($tail)) {
+        $body = $tail;
+      } else {
+        $body = '';
+      }
+    } else {
+      // Here, the body is the raw unwrapped body.
+      $body = $parts[6];
+    }
+
     return id(new DiffusionCommitRef())
       ->setCommitterName($parts[0])
       ->setCommitterEmail($parts[1])
@@ -89,7 +137,7 @@
       ->setAuthorEmail($parts[3])
       ->setHashes($hashes)
       ->setAuthorEpoch($author_epoch)
-      ->setMessage($parts[6]);
+      ->setMessage($body);
   }
 
   private function loadMercurialCommitRef() {