[ostree] repo: Add ostree_repo_verify_summary()

[Matthew Barnes <mbarnes src gnome org>]

commit 1df16a76759b29bf1419abff7f0e82d5378dbce3
Author: Matthew Barnes <mbarnes redhat com>
Date:   Wed Dec 16 18:53:57 2015 -0500

    repo: Add ostree_repo_verify_summary()
    
    Verifies signatures on a summary -- both taken as GBytes inputs -- and
    returns an OstreeGpgVerifyResult.

 doc/ostree-sections.txt     |    1 +
 src/libostree/ostree-repo.c |   59 +++++++++++++++++++++++++++++++++++--------
 src/libostree/ostree-repo.h |    7 +++++
 3 files changed, 56 insertions(+), 11 deletions(-)
---
diff --git a/doc/ostree-sections.txt b/doc/ostree-sections.txt
index aecaa56..5e9dfb9 100644
--- a/doc/ostree-sections.txt
+++ b/doc/ostree-sections.txt
@@ -313,6 +313,7 @@ ostree_repo_sign_commit
 ostree_repo_append_gpg_signature
 ostree_repo_verify_commit
 ostree_repo_verify_commit_ext
+ostree_repo_verify_summary
 ostree_repo_regenerate_summary
 <SUBSECTION Standard>
 OSTREE_REPO
diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index cc3bd6f..f9cd5cc 100644
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -1879,17 +1879,13 @@ ostree_repo_remote_fetch_summary (OstreeRepo    *self,
   if (gpg_verify_summary && summary != NULL && signatures != NULL)
     {
       glnx_unref_object OstreeGpgVerifyResult *result = NULL;
-      g_autoptr(GVariant) signatures_variant = NULL;
-
-      signatures_variant = g_variant_new_from_bytes (OSTREE_SUMMARY_SIG_GVARIANT_FORMAT,
-                                                     signatures, FALSE);
-      result = _ostree_repo_gpg_verify_with_metadata (self,
-                                                      summary,
-                                                      signatures_variant,
-                                                      name,
-                                                      NULL, NULL,
-                                                      cancellable,
-                                                      error);
+
+      result = ostree_repo_verify_summary (self,
+                                           name,
+                                           summary,
+                                           signatures,
+                                           cancellable,
+                                           error);
       if (result == NULL)
         goto out;
 
@@ -4490,6 +4486,47 @@ ostree_repo_verify_commit_ext (OstreeRepo    *self,
 }
 
 /**
+ * ostree_repo_verify_summary:
+ * @self: Repo
+ * @remote_name: Name of remote
+ * @summary: Summary data as a #GBytes
+ * @signatures: Summary signatures as a #GBytes
+ * @cancellable: Cancellable
+ * @error: Error
+ *
+ * Verify @signatures for @summary data using GPG keys in the keyring for
+ * @remote_name, and return an #OstreeGpgVerifyResult.
+ *
+ * Returns: (transfer full): an #OstreeGpgVerifyResult, or %NULL on error
+ */
+OstreeGpgVerifyResult *
+ostree_repo_verify_summary (OstreeRepo    *self,
+                            const char    *remote_name,
+                            GBytes        *summary,
+                            GBytes        *signatures,
+                            GCancellable  *cancellable,
+                            GError       **error)
+{
+  g_autoptr(GVariant) signatures_variant = NULL;
+
+  g_return_val_if_fail (OSTREE_IS_REPO (self), NULL);
+  g_return_val_if_fail (remote_name != NULL, NULL);
+  g_return_val_if_fail (summary != NULL, NULL);
+  g_return_val_if_fail (signatures != NULL, NULL);
+
+  signatures_variant = g_variant_new_from_bytes (OSTREE_SUMMARY_SIG_GVARIANT_FORMAT,
+                                                 signatures, FALSE);
+
+  return _ostree_repo_gpg_verify_with_metadata (self,
+                                                summary,
+                                                signatures_variant,
+                                                remote_name,
+                                                NULL, NULL,
+                                                cancellable,
+                                                error);
+}
+
+/**
  * ostree_repo_regenerate_summary:
  * @self: Repo
  * @additional_metadata: (allow-none): A GVariant of type a{sv}, or %NULL
diff --git a/src/libostree/ostree-repo.h b/src/libostree/ostree-repo.h
index 69720a2..51a4075 100644
--- a/src/libostree/ostree-repo.h
+++ b/src/libostree/ostree-repo.h
@@ -782,6 +782,13 @@ OstreeGpgVerifyResult * ostree_repo_verify_commit_ext (OstreeRepo    *self,
                                                        GCancellable  *cancellable,
                                                        GError       **error);
 
+OstreeGpgVerifyResult * ostree_repo_verify_summary (OstreeRepo    *self,
+                                                    const char    *remote_name,
+                                                    GBytes        *summary,
+                                                    GBytes        *signatures,
+                                                    GCancellable  *cancellable,
+                                                    GError       **error);
+
 gboolean ostree_repo_regenerate_summary (OstreeRepo     *self,
                                          GVariant       *additional_metadata,
                                          GCancellable   *cancellable,