From 4f5ed95bb94a47a0d8849b783e01a0f9597ee2da Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Tue, 1 Jun 2010 11:20:05 +0000
Subject: [PATCH] * For ease of use during debugging, don't require
 --gc-roots-dir.

---
 src/c/hydra_eval_jobs.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/c/hydra_eval_jobs.cc b/src/c/hydra_eval_jobs.cc
index bffbab44..0f493849 100644
--- a/src/c/hydra_eval_jobs.cc
+++ b/src/c/hydra_eval_jobs.cc
@@ -151,8 +151,10 @@ static void findJobsWrapped(EvalState & state, XMLWriter & doc,
             /* Register the derivation as a GC root.  !!! This
                registers roots for jobs that we may have already
                done. */
-            Path root = gcRootsDir + "/" + baseNameOf(drvPath);
-            if (!pathExists(root)) addPermRoot(drvPath, root, false);
+            if (gcRootsDir != "") {
+                Path root = gcRootsDir + "/" + baseNameOf(drvPath);
+                if (!pathExists(root)) addPermRoot(drvPath, root, false);
+            }
             
             XMLOpenElement _(doc, "job", xmlAttrs);
             showArgsUsed(doc, argsUsed);
@@ -229,7 +231,7 @@ void run(Strings args)
 
     if (releaseExpr == "") throw UsageError("no expression specified");
     
-    if (gcRootsDir == "") throw UsageError("--gc-roots-dir not specified");
+    if (gcRootsDir == "") printMsg(lvlError, "warning: `--gc-roots-dir' not specified");
     
     store = openStore();