On Tue, Jan 10, 2017 at 06:08:39PM -0500, Leo Famulari wrote:
> On Tue, Jan 10, 2017 at 11:41:40PM +0100, Ludovic Courtès wrote:
> > Leo Famulari <leo@famulari.name> skribis:
> > > The last time I noticed an exported replacement, I found that it was
> > > resolved non-deterministically (using `guix build -S` in a loop), and
> > > we made the replacement private:
> > >
> > > http://git.savannah.gnu.org/cgit/guix.git/commit/?id=69aa6e0995b55a38d5ce174602a107645be726d5
> > 
> > I can’t seem to reproduce it here, but it sounds like an interesting
> > bug.  :-)
> 
> Me neither. IIRC, it would manifest at least 1/10 iterations of the
> loop.

I can reproduce it by applying the diff below on
88f2dd1ddf8123f628ee0b64406b6fd2a6a9f076 and running:

$ while true; do ./pre-inst-env guix build gnutls -S; done
guix build: warning: ambiguous package specification `gnutls'
guix build: warning: choosing gnutls-3.5.4 from gnu/packages/tls.scm:139:2
/gnu/store/kfjzkvlxjp98mcf356ay027vy5p5lsp3-gnutls-3.5.8.tar.xz
guix build: warning: ambiguous package specification `gnutls'
guix build: warning: choosing gnutls-3.5.4 from gnu/packages/tls.scm:216:2
/gnu/store/kfjzkvlxjp98mcf356ay027vy5p5lsp3-gnutls-3.5.8.tar.xz
guix build: warning: ambiguous package specification `gnutls'
guix build: warning: choosing gnutls-3.5.4 from gnu/packages/tls.scm:216:2
/gnu/store/kfjzkvlxjp98mcf356ay027vy5p5lsp3-gnutls-3.5.8.tar.xz
guix build: warning: ambiguous package specification `gnutls'
guix build: warning: choosing gnutls-3.5.4 from gnu/packages/tls.scm:139:2
/gnu/store/kfjzkvlxjp98mcf356ay027vy5p5lsp3-gnutls-3.5.8.tar.xz

diff --git a/gnu/packages/tls.scm b/gnu/packages/tls.scm
index e577421fa..19d5049c3 100644
--- a/gnu/packages/tls.scm
+++ b/gnu/packages/tls.scm
@@ -138,6 +138,7 @@ living in the same process.")
 (define-public gnutls
   (package
     (name "gnutls")
+    (replacement gnutls-3.5.8)
     (version "3.5.4")
     (source (origin
              (method url-fetch)
@@ -211,6 +212,20 @@ required structures.")
     (properties '((ftp-server . "ftp.gnutls.org")
                   (ftp-directory . "/gcrypt/gnutls")))))
 
+(define-public gnutls-3.5.8
+  (package
+    (inherit gnutls)
+    (source
+      (let ((version "3.5.8"))
+        (origin
+          (method url-fetch)
+          (uri (string-append "mirror://gnupg/gnutls/v"
+                              (version-major+minor version)
+                              "/gnutls-" version ".tar.xz"))
+          (sha256
+           (base32
+            "1zyl2z63s68hx1dpxqx0lykmlf3rwrzlrf44sq3h7dvjmr1z55qf")))))))
+
 (define-public openssl
   (package
    (name "openssl")