lib/sign: convert invariant checks to assertions

This converts several invariant checks to asserts. Most of the
functions in this file were already using assertions, so this aligns
the remaining few outliers to the rest.

src/libostree/ostree-sign.c

@@ -96,8 +96,11 @@ ostree_sign_default_init (OstreeSignInterface *iface)
 const gchar *
 ostree_sign_metadata_key (OstreeSign *self)
 {
+  g_assert (OSTREE_IS_SIGN (self));
+
+  if (OSTREE_SIGN_GET_IFACE (self)->metadata_key == NULL)
+    return NULL;
 
-  g_return_val_if_fail (OSTREE_SIGN_GET_IFACE (self)->metadata_key != NULL, NULL);
   return OSTREE_SIGN_GET_IFACE (self)->metadata_key (self);
 }
 
@@ -116,8 +119,11 @@ ostree_sign_metadata_key (OstreeSign *self)
 const gchar *
 ostree_sign_metadata_format (OstreeSign *self)
 {
+  g_assert (OSTREE_IS_SIGN (self));
+
+  if (OSTREE_SIGN_GET_IFACE (self)->metadata_format == NULL)
+    return NULL;
 
-  g_return_val_if_fail (OSTREE_SIGN_GET_IFACE (self)->metadata_format != NULL, NULL);
   return OSTREE_SIGN_GET_IFACE (self)->metadata_format (self);
 }
 
@@ -136,7 +142,8 @@ gboolean
 ostree_sign_clear_keys (OstreeSign *self,
                         GError **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
   if (OSTREE_SIGN_GET_IFACE (self)->clear_keys == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -163,7 +170,8 @@ ostree_sign_set_sk (OstreeSign *self,
                     GVariant *secret_key,
                     GError **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
   if (OSTREE_SIGN_GET_IFACE (self)->set_sk == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -191,7 +199,8 @@ ostree_sign_set_pk (OstreeSign *self,
                     GVariant *public_key,
                     GError **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
   if (OSTREE_SIGN_GET_IFACE (self)->set_pk == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -219,7 +228,8 @@ ostree_sign_add_pk (OstreeSign *self,
                     GVariant *public_key,
                     GError **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
   if (OSTREE_SIGN_GET_IFACE (self)->add_pk == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -258,7 +268,8 @@ ostree_sign_load_pk (OstreeSign *self,
                      GVariant *options,
                      GError **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
   if (OSTREE_SIGN_GET_IFACE (self)->load_pk == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -290,8 +301,8 @@ ostree_sign_data (OstreeSign *self,
                   GCancellable *cancellable,
                   GError **error)
 {
+  g_assert (OSTREE_IS_SIGN (self));
 
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
   if (OSTREE_SIGN_GET_IFACE (self)->data == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -324,7 +335,8 @@ ostree_sign_data_verify (OstreeSign *self,
                          char      **out_success_message,
                          GError     **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
   if (OSTREE_SIGN_GET_IFACE (self)->data_verify == NULL)
     return glnx_throw (error, "not implemented");
 
@@ -337,9 +349,13 @@ ostree_sign_data_verify (OstreeSign *self,
 static GVariant *
 _sign_detached_metadata_append (OstreeSign *self,
                                 GVariant   *existing_metadata,
-                                GBytes     *signature_bytes)
+                                GBytes     *signature_bytes,
+                                GError    **error)
 {
-  g_return_val_if_fail (signature_bytes != NULL, FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
+
+  if (signature_bytes == NULL)
+    return glnx_null_throw (error, "Invalid NULL signature bytes");
 
   GVariantDict metadata_dict;
   g_autoptr(GVariant) signature_data = NULL;
@@ -395,7 +411,7 @@ ostree_sign_commit_verify (OstreeSign     *self,
                            GError         **error)
 
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
 
   g_autoptr(GVariant) commit_variant = NULL;
   /* Load the commit */
@@ -447,10 +463,12 @@ ostree_sign_commit_verify (OstreeSign     *self,
 const gchar * 
 ostree_sign_get_name (OstreeSign *self)
 {
-    g_return_val_if_fail (OSTREE_IS_SIGN (self), NULL);
+  g_assert (OSTREE_IS_SIGN (self));
-    g_return_val_if_fail (OSTREE_SIGN_GET_IFACE (self)->get_name != NULL, NULL);
 
-    return OSTREE_SIGN_GET_IFACE (self)->get_name (self);
+  if (OSTREE_SIGN_GET_IFACE (self)->get_name == NULL)
+    return NULL;
+
+  return OSTREE_SIGN_GET_IFACE (self)->get_name (self);
 }
 
 /**
@@ -503,7 +521,9 @@ ostree_sign_commit (OstreeSign     *self,
     return glnx_prefix_error (error, "Not able to sign the cobject");
 
   new_metadata =
-    _sign_detached_metadata_append (self, old_metadata, signature);
+    _sign_detached_metadata_append (self, old_metadata, signature, error);
+  if (new_metadata == NULL)
+    return FALSE;
 
   if (!ostree_repo_write_commit_detached_metadata (repo,
                                                    commit_checksum,
@@ -603,8 +623,8 @@ ostree_sign_summary (OstreeSign    *self,
                      GCancellable  *cancellable,
                      GError       **error)
 {
-  g_return_val_if_fail (OSTREE_IS_SIGN (self), FALSE);
+  g_assert (OSTREE_IS_SIGN (self));
-  g_return_val_if_fail (OSTREE_IS_REPO (repo), FALSE);
+  g_assert (OSTREE_IS_REPO (repo));
 
   g_autoptr(GVariant) normalized = NULL;
   g_autoptr(GBytes) summary_data = NULL;
@@ -653,7 +673,9 @@ ostree_sign_summary (OstreeSign    *self,
 
       g_autoptr(GVariant) old_metadata = g_steal_pointer (&metadata);
       metadata =
-        _sign_detached_metadata_append (self, old_metadata, signature);
+        _sign_detached_metadata_append (self, old_metadata, signature, error);
+      if (metadata == NULL)
+        return FALSE;
     }
   g_variant_iter_free (iter);