Add 'readdir' call.

This adds a readdir call (mostly intended for programs).  The
return value is a list of guestfs_dirent structures.

This adds the new types 'struct guestfs_dirent' and
'struct guestfs_dirent_list', along with all the code to
return these in the different language bindings.

Also includes additional tests for OCaml and Perl bindings
to test this.

perl/t/060-readdir.t

@@ -0,0 +1,63 @@
+# libguestfs Perl bindings -*- perl -*-
+# Copyright (C) 2009 Red Hat Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+use strict;
+use warnings;
+use Test::More tests => 13;
+
+use Sys::Guestfs;
+
+my $h = Sys::Guestfs->new ();
+ok ($h);
+open FILE, ">test.img";
+truncate FILE, 10*1024*1024;
+close FILE;
+ok (1);
+
+$h->add_drive ("test.img");
+ok (1);
+
+$h->launch ();
+ok (1);
+$h->wait_ready ();
+ok (1);
+
+$h->sfdisk ("/dev/sda", 0, 0, 0, [","]);
+ok (1);
+$h->mkfs ("ext2", "/dev/sda1");
+ok (1);
+$h->mount ("/dev/sda1", "/");
+ok (1);
+$h->mkdir ("/p");
+ok (1);
+$h->touch ("/q");
+ok (1);
+
+my @dirs = $h->readdir ("/");
+@dirs = sort { $a->{name} cmp $b->{name} } @dirs;
+foreach (@dirs) {
+  print "$_->{name} $_->{ino} $_->{ftyp}\n";
+}
+ok (1);
+
+$h->sync ();
+ok (1);
+
+undef $h;
+ok (1);
+
+unlink ("test.img");