[ostree] deploy: Add an assertion that deployment directory exists

[Colin Walters <walters src gnome org>]

commit 890d685c7976fa7c7badd9ec42189e577824493a
Author: Colin Walters <walters verbum org>
Date:   Thu Apr 3 18:29:07 2014 -0400

    deploy: Add an assertion that deployment directory exists
    
    I may be seeing something going wrong in rpm-ostree, just adding this
    assertion for my own sanity.

 src/libostree/ostree-sysroot-deploy.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/src/libostree/ostree-sysroot-deploy.c b/src/libostree/ostree-sysroot-deploy.c
index 1aac2cd..87346b7 100644
--- a/src/libostree/ostree-sysroot-deploy.c
+++ b/src/libostree/ostree-sysroot-deploy.c
@@ -1133,9 +1133,19 @@ ostree_sysroot_write_deployments (OstreeSysroot     *self,
   for (i = 0; i < new_deployments->len; i++)
     {
       OstreeDeployment *deployment = new_deployments->pdata[i];
+      gs_unref_object GFile *deployment_root = NULL;
       
       if (deployment == self->booted_deployment)
         found_booted_deployment = TRUE;
+      
+      deployment_root = ostree_sysroot_get_deployment_directory (self, deployment);
+      if (!g_file_query_exists (deployment_root, NULL))
+        {
+          g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
+                       "Unable to find expected deployment root: %s",
+                       gs_file_get_path_cached (deployment_root));
+          goto out;
+        }
 
       ostree_deployment_set_index (deployment, i);
     }