From accb682c5027cb91104cce7786f9dc4403adf51c Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Sat, 21 Mar 2015 23:21:53 +0100
Subject: gexp: Allow <gexp-input> objects in #:allowed-references.

* guix/gexp.scm (lower-references): Add <gexp-input> case.
* tests/gexp.scm ("gexp->derivation #:allowed-references, specific
  output"): New test.
---
 guix/gexp.scm  |  5 +++++
 tests/gexp.scm | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/guix/gexp.scm b/guix/gexp.scm
index 4a2a924a03..218914c4b4 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -201,6 +201,11 @@ names and file names suitable for the #:allowed-references argument to
       (match-lambda
        ((? string? output)
         (return output))
+       (($ <gexp-input> thing output native?)
+        (mlet* %store-monad ((lower -> (lookup-compiler thing))
+                             (drv      (lower thing system
+                                              (if native? #f target))))
+          (return (derivation->output-path drv output))))
        (thing
         (mlet* %store-monad ((lower -> (lookup-compiler thing))
                              (drv      (lower thing system target)))
diff --git a/tests/gexp.scm b/tests/gexp.scm
index 4c31e22f15..27c08467e7 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -497,6 +497,23 @@
                                              (list "out" %bootstrap-guile))))
     (built-derivations (list drv))))
 
+(test-assertm "gexp->derivation #:allowed-references, specific output"
+  (mlet* %store-monad ((in  (gexp->derivation "thing"
+                                              #~(begin
+                                                  (mkdir #$output:ok)
+                                                  (mkdir #$output:not-ok))))
+                       (drv (gexp->derivation "allowed-refs"
+                                              #~(begin
+                                                  (pk #$in:not-ok)
+                                                  (mkdir #$output)
+                                                  (chdir #$output)
+                                                  (symlink #$output "self")
+                                                  (symlink #$in:ok "ok"))
+                                              #:allowed-references
+                                              (list "out"
+                                                    (gexp-input in "ok")))))
+    (built-derivations (list drv))))
+
 (test-assert "gexp->derivation #:allowed-references, disallowed"
   (let ((drv (run-with-store %store
                (gexp->derivation "allowed-refs"
-- 
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