inferior: Support querying package replacements.

I'm looking at this to help with adding support for looking up package
replacements to store in the Guix Data Service.

* guix/inferior.scm (inferior-package-replacement): New procedure.
* tests/inferior.scm ("inferior-package-replacement"): New test.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/inferior.scm b/tests/inferior.scm
index f227e0b749..9992077cb2 100644
--- a/tests/inferior.scm
+++ b/tests/inferior.scm
@@ -26,6 +26,7 @@
   #:use-module (gnu packages)
   #:use-module (gnu packages bootstrap)
   #:use-module (gnu packages guile)
+  #:use-module (gnu packages sqlite)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-34)
   #:use-module (srfi srfi-64)
@@ -260,6 +261,25 @@
          (list (inferior-package-derivation %store guile "x86_64-linux")
                (inferior-package-derivation %store guile "armhf-linux")))))
 
+(unless (package-replacement sqlite)
+  (test-skip 1))
+
+(test-equal "inferior-package-replacement"
+  (package-derivation %store
+                      (package-replacement sqlite)
+                      "x86_64-linux")
+  (let* ((inferior (open-inferior %top-builddir
+                                  #:command "scripts/guix"))
+         (packages (inferior-packages inferior)))
+    (match (lookup-inferior-packages inferior
+                                     (package-name sqlite)
+                                     (package-version sqlite))
+      ((inferior-sqlite rest ...)
+       (inferior-package-derivation %store
+                                    (inferior-package-replacement
+                                     inferior-sqlite)
+                                    "x86_64-linux")))))
+
 (test-equal "inferior-package->manifest-entry"
   (manifest-entry->list (package->manifest-entry
                          (first (find-best-packages-by-name "guile" #f))))