From a3cdcd275c5bcb63bf459b1fa031513ae8662ffa Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 1 Sep 2016 15:29:00 +0300
Subject: Make ?sys: to change preference to system

---
 bpkg/package | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'bpkg/package')

diff --git a/bpkg/package b/bpkg/package
index f70a198..6f1d955 100644
--- a/bpkg/package
+++ b/bpkg/package
@@ -384,6 +384,31 @@ namespace bpkg
       return system_version_ ? &*system_version_ : nullptr;
     }
 
+    // As above but also return an indication if the version information is
+    // authoritative.
+    //
+    pair<const version_type*, bool>
+    system_version_authoritative () const
+    {
+      const system_package* sp (system_repository.find (id.name));
+
+      if (!system_version_)
+      {
+        if (sp != nullptr)
+        {
+          // Only cache if it is authoritative.
+          //
+          if (sp->authoritative)
+            system_version_ = sp->version;
+          else
+            return make_pair (&sp->version, false);
+        }
+      }
+
+      return make_pair (system_version_ ?  &*system_version_ : nullptr,
+                        sp != nullptr ? sp->authoritative : false);
+    }
+
     // Database mapping.
     //
     #pragma db member(id) id column("")
-- 
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