pull: Add per-remote cookie jar

Optionally read cookie jars for a remote to be used when downloading
data. This can be used for private repositories which require specific
cookies to be present, e.g. repositories hosted on Amazon cloudfront
using signed cookies.

Closes: #531
Approved by: cgwalters

src/libostree/ostree-repo-pull.c

@@ -1964,6 +1964,19 @@ _ostree_repo_remote_new_fetcher (OstreeRepo  *self,
       _ostree_fetcher_set_proxy (fetcher, http_proxy);
   }
 
+  {
+    g_autofree char *jar_path = NULL;
+    g_autofree char *cookie_file = g_strdup_printf ("%s.cookies.txt",
+                                                    remote_name);
+
+    jar_path = g_build_filename (g_file_get_path (self->repodir), cookie_file,
+                                 NULL);
+
+    if (g_file_test(jar_path, G_FILE_TEST_IS_REGULAR))
+      _ostree_fetcher_set_cookie_jar (fetcher, jar_path);
+
+  }
+
   success = TRUE;
 
 out: