[ostree] checkout: permit checkout of a single file

[Colin Walters <walters src gnome org>]

commit 7973a58607ebb8be9e75cbad71c02ac1b2f9c752
Author: Giuseppe Scrivano <gscrivan redhat com>
Date:   Thu Oct 23 15:38:44 2014 +0200

    checkout: permit checkout of a single file
    
    fixes a coredump when using a command like:
    
    $ ostree --repo=repo checkout -U --subpath=/usr/lib/passwd \
      fedora-atomic/rawhide/x86_64/docker-host usrlib-new
    
    Signed-off-by: Giuseppe Scrivano <gscrivan redhat com>

 Makefile-tests.am                    |    1 +
 src/libostree/ostree-repo-checkout.c |   10 ++++++++++
 tests/test-repo-checkout-subpath.sh  |   34 ++++++++++++++++++++++++++++++++++
 3 files changed, 45 insertions(+), 0 deletions(-)
---
diff --git a/Makefile-tests.am b/Makefile-tests.am
index e5caa68..088d2fa 100644
--- a/Makefile-tests.am
+++ b/Makefile-tests.am
@@ -45,6 +45,7 @@ testfiles = test-basic \
        test-admin-deploy-uboot \
        test-admin-instutil-set-kargs \
        test-admin-upgrade-not-backwards \
+       test-repo-checkout-subpath      \
        test-setuid \
        test-delta \
        test-xattrs \
diff --git a/src/libostree/ostree-repo-checkout.c b/src/libostree/ostree-repo-checkout.c
index 2963996..03efd60 100644
--- a/src/libostree/ostree-repo-checkout.c
+++ b/src/libostree/ostree-repo-checkout.c
@@ -587,6 +587,16 @@ checkout_tree_at (OstreeRepo                        *self,
         }
     }
 
+  if (g_file_info_get_file_type (source_info) != G_FILE_TYPE_DIRECTORY)
+    {
+      ret = checkout_one_file_at (self, (GFile *) source,
+                                  source_info,
+                                  destination_dfd, destination,
+                                  g_file_info_get_name (source_info),
+                                  mode, TRUE,
+                                  cancellable, error);
+      goto out;
+    }
   dir_enum = g_file_enumerate_children ((GFile*)source,
                                         OSTREE_GIO_FAST_QUERYINFO, 
                                         G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS,
diff --git a/tests/test-repo-checkout-subpath.sh b/tests/test-repo-checkout-subpath.sh
new file mode 100755
index 0000000..db21fef
--- /dev/null
+++ b/tests/test-repo-checkout-subpath.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+#
+# Copyright (C) 2011,2013 Colin Walters <walters verbum org>
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+set -e
+
+. $(dirname $0)/libtest.sh
+
+setup_test_repository "bare"
+echo "ok setup"
+
+echo '1..2'
+
+repopath=${test_tmpdir}/ostree-srv/gnomerepo
+
+ostree --repo=repo checkout -U --subpath=/ test2 checkedout
+
+ostree --repo=repo checkout -U --subpath=/firstfile test2 checkedout2