Fix directory-listing, directory-deletion and file deletion, when links are involved.

runtime/bin/directory_linux.cc

Index: runtime/bin/directory_linux.cc
diff --git a/runtime/bin/directory_linux.cc b/runtime/bin/directory_linux.cc
index f6ad163905b8daae5fcdce5dcae26e2c7c907cfb..a316633d8e5b76fccfa913b472c670a19c3792c1 100644
--- a/runtime/bin/directory_linux.cc
+++ b/runtime/bin/directory_linux.cc
@@ -169,6 +169,9 @@ static bool ListRecursively(PathBuffer* path,
         int stat_success;
         if (follow_links) {
           stat_success = TEMP_FAILURE_RETRY(stat(path->data, &entry_info));
+          if (stat_success == -1) {
+            stat_success = TEMP_FAILURE_RETRY(lstat(path->data, &entry_info));
+          }
         } else {
           stat_success = TEMP_FAILURE_RETRY(lstat(path->data, &entry_info));
         }
@@ -189,7 +192,6 @@ static bool ListRecursively(PathBuffer* path,
                                path,
                                listing) && success;
         } else if (S_ISLNK(entry_info.st_mode)) {
-          ASSERT(!follow_links);
           success = HandleLink(entry.d_name,
                                path,
                                listing) && success;
@@ -232,7 +234,6 @@ static bool DeleteDir(char* dir_name,
 
 
 static bool DeleteRecursively(PathBuffer* path) {
-  if (!path->Add(File::PathSeparator())) return false;
   // Do not recurse into links for deletion. Instead delete the link.
   struct stat st;
   if (TEMP_FAILURE_RETRY(lstat(path->data, &st)) == -1) {
@@ -241,6 +242,8 @@ static bool DeleteRecursively(PathBuffer* path) {
     return (remove(path->data) == 0);
   }
 
+  if (!path->Add(File::PathSeparator())) return false;
+
   // Not a link. Attempt to open as a directory and recurse into the
   // directory.
   DIR* dir_pointer;