[evolution-data-server] Bug 762759 - Crash on start when ~/.cache is not accessible

[Milan Crha <mcrha src gnome org>]

commit e0e4c6d0c1854023844e4cbecc1c2c3528967ee2
Author: Milan Crha <mcrha redhat com>
Date:   Thu Mar 3 18:50:59 2016 +0100

    Bug 762759 - Crash on start when ~/.cache is not accessible

 camel/camel-data-cache.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)
---
diff --git a/camel/camel-data-cache.c b/camel/camel-data-cache.c
index a518ea3..e7c15e0 100644
--- a/camel/camel-data-cache.c
+++ b/camel/camel-data-cache.c
@@ -245,6 +245,8 @@ void
 camel_data_cache_set_expire_age (CamelDataCache *cdc,
                                  time_t when)
 {
+       g_return_if_fail (CAMEL_IS_DATA_CACHE (cdc));
+
        cdc->priv->expire_age = when;
 }
 
@@ -267,6 +269,8 @@ void
 camel_data_cache_set_expire_access (CamelDataCache *cdc,
                                     time_t when)
 {
+       g_return_if_fail (CAMEL_IS_DATA_CACHE (cdc));
+
        cdc->priv->expire_access = when;
 }
 
@@ -382,6 +386,8 @@ camel_data_cache_add (CamelDataCache *cdc,
        GFileIOStream *stream;
        GFile *file;
 
+       g_return_val_if_fail (CAMEL_IS_DATA_CACHE (cdc), NULL);
+
        real = data_cache_path (cdc, TRUE, path, key);
        /* need to loop 'cause otherwise we can call bag_add/bag_abort
         * after bag_reserve returned a pointer, which is an invalid
@@ -437,6 +443,8 @@ camel_data_cache_get (CamelDataCache *cdc,
        struct stat st;
        gchar *real;
 
+       g_return_val_if_fail (CAMEL_IS_DATA_CACHE (cdc), NULL);
+
        real = data_cache_path (cdc, FALSE, path, key);
        stream = camel_object_bag_reserve (cdc->priv->busy_bag, real);
        if (stream != NULL)
@@ -483,6 +491,8 @@ camel_data_cache_get_filename (CamelDataCache *cdc,
                                const gchar *path,
                                const gchar *key)
 {
+       g_return_val_if_fail (CAMEL_IS_DATA_CACHE (cdc), NULL);
+
        return data_cache_path (cdc, FALSE, path, key);
 }
 
@@ -507,6 +517,8 @@ camel_data_cache_remove (CamelDataCache *cdc,
        gchar *real;
        gint ret;
 
+       g_return_val_if_fail (CAMEL_IS_DATA_CACHE (cdc), -1);
+
        real = data_cache_path (cdc, FALSE, path, key);
        stream = camel_object_bag_get (cdc->priv->busy_bag, real);
        if (stream) {
@@ -549,7 +561,7 @@ camel_data_cache_clear (CamelDataCache *cdc,
        const gchar *dname;
        struct stat st;
 
-       g_return_if_fail (cdc != NULL);
+       g_return_if_fail (CAMEL_IS_DATA_CACHE (cdc));
        g_return_if_fail (path != NULL);
 
        base_dir = g_build_filename (cdc->priv->path, path, NULL);