+ /* Don't trust guestfs_head_n not to break with very large files.
+ * Check the file size is something reasonable first.
+ */
+ size = guestfs_filesize (g, filename);
+ if (size == -1)
+ /* guestfs_filesize failed and has already set error in handle */
+ return -1;
+ if (size > 1000000) {
+ error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
+ filename, size);
+ return -1;
+ }
+
+ lines = guestfs_head_n (g, 10, filename);