init: Add a --collection-id argument to the built-in init command

This allows new repositories to be configured with a collection ID which
can be used to uniquely identify refs which originated from this
repository.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Closes: #924
Approved by: cgwalters

src/ostree/ot-builtin-init.c

@@ -27,9 +27,16 @@
 #include "ostree.h"
 
 static char *opt_mode = "bare";
+#ifdef OSTREE_ENABLE_EXPERIMENTAL_API
+static char *opt_collection_id = NULL;
+#endif  /* OSTREE_ENABLE_EXPERIMENTAL_API */
 
 static GOptionEntry options[] = {
   { "mode", 0, 0, G_OPTION_ARG_STRING, &opt_mode, "Initialize repository in given mode (bare, archive-z2)", NULL },
+#ifdef OSTREE_ENABLE_EXPERIMENTAL_API
+  { "collection-id", 0, 0, G_OPTION_ARG_STRING, &opt_collection_id,
+    "Globally unique ID for this repository as an collection of refs for redistribution to other repositories", "COLLECTION-ID" },
+#endif  /* OSTREE_ENABLE_EXPERIMENTAL_API */
   { NULL }
 };
 
@@ -48,6 +55,10 @@ ostree_builtin_init (int argc, char **argv, GCancellable *cancellable, GError **
 
   if (!ostree_repo_mode_from_string (opt_mode, &mode, error))
     goto out;
+#ifdef OSTREE_ENABLE_EXPERIMENTAL_API
+  if (!ostree_repo_set_collection_id (repo, opt_collection_id, error))
+    goto out;
+#endif  /* OSTREE_ENABLE_EXPERIMENTAL_API */
 
   if (!ostree_repo_create (repo, mode, NULL, error))
     goto out;