From 13f463643603dd5db10bce04321b05b68e5d8f58 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Mon, 12 Mar 2012 21:13:28 +0100
Subject: [PATCH] hydra-evaluator: handle the case where there is no previous
 jobset eval

---
 src/script/hydra-evaluator | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/script/hydra-evaluator b/src/script/hydra-evaluator
index f41e98fa..2765458f 100755
--- a/src/script/hydra-evaluator
+++ b/src/script/hydra-evaluator
@@ -110,7 +110,8 @@ sub checkJobset {
     # inputs.  If so, bail out.
     my @args = ($jobset->nixexprinput, $jobset->nixexprpath, inputsToArgs($inputInfo));
     my $argsHash = sha256_hex("@args");
-    if (getPrevJobsetEval($db, $jobset, 0)->hash eq $argsHash) {
+    my $prevEval = getPrevJobsetEval($db, $jobset, 0);
+    if (defined $prevEval && $prevEval->hash eq $argsHash) {
         print STDERR "  jobset is unchanged, skipping\n";
         txn_do($db, sub {
             $jobset->update({lastcheckedtime => time});