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authorShea Levy <shea@shealevy.com>2015-07-23T13·34-0400
committerEelco Dolstra <eelco.dolstra@logicblox.com>2015-07-23T15·03+0200
commit1ed55234d9efce7d40c97ef1215090015d18498c (patch)
tree23ebb9e5716a68f3437ad4e41cb852d217dd3040 /src
parent61af14a9219bff090b238f15c9def5453087aa5d (diff)
Allow derivations-as-srcs in the context of builtins.toFile files
Diffstat (limited to 'src')
-rw-r--r--src/libexpr/primops.cc8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 6a4b5b042043..f555de73e164 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -872,8 +872,12 @@ static void prim_toFile(EvalState & state, const Pos & pos, Value * * args, Valu
 
     for (auto path : context) {
         if (path.at(0) == '=') path = string(path, 1);
-        if (isDerivation(path))
-            throw EvalError(format("in ‘toFile’: the file ‘%1%’ cannot refer to derivation outputs, at %2%") % name % pos);
+        if (isDerivation(path)) {
+            /* See prim_unsafeDiscardOutputDependency. */
+            if (path.at(0) != '~')
+                throw EvalError(format("in ‘toFile’: the file ‘%1%’ cannot refer to derivation outputs, at %2%") % name % pos);
+            path = string(path, 1);
+	}
         refs.insert(path);
     }