From db4f4a842515392a6b40f5c86b2ef885c1278451 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Thu, 14 Aug 2008 13:02:19 +0000
Subject: * Backward compatibility check to prevent nixos-rebuild from barfing 
  when upgrading Nix.

---
 src/libstore/remote-store.cc | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/libstore/remote-store.cc')

diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index bc04c8adb9ab..66e5256422b6 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -216,6 +216,7 @@ bool RemoteStore::hasSubstitutes(const Path & path)
 bool RemoteStore::querySubstitutablePathInfo(const Path & path,
     SubstitutablePathInfo & info)
 {
+    if (GET_PROTOCOL_MINOR(daemonVersion) < 3) return false;
     writeInt(wopQuerySubstitutablePathInfo, to);
     writeString(path, to);
     processStderr();
-- 
cgit 1.4.1