packages: 'package-grafts' trims native inputs.

'package-grafts' returns a list of potentially applicable grafts, which
'cumulative-grafts' then narrows by looking at store item references and
determining the subset of the grafts that's actually applicable.

Until now, 'package-grafts' would traverse native inputs and would thus
return a large superset of the applicable grafts, since native inputs
are not in the reference graph by definition.  This patch fixes that by
having 'package-grafts' ignore entirely native inputs from the
dependency graph.

* guix/packages.scm (fold-bag-dependencies)[bag-direct-inputs*]: Add
special case for libc.
* guix/packages.scm (bag-grafts)[native-grafts, target-grafts]: Remove.
[grafts]: New procedure.
Use it.
* tests/packages.scm ("package-grafts, grafts of native inputs
ignored"): New test.

1 files changed, 18 insertions, 0 deletions

diff --git a/tests/packages.scm b/tests/packages.scm
index 930374dabf..fe7bd1ded6 100644
--- a/tests/packages.scm
+++ b/tests/packages.scm
@@ -660,6 +660,24 @@
 ;;     (package-cross-derivation %store p "mips64el-linux-gnu"
 ;;                               #:graft? #t)))
 
+;; It doesn't make sense for 'package-grafts' to look at native inputs since,
+;; by definition, they are not referenced at run time.  Make sure
+;; 'package-grafts' respects this.
+(test-equal "package-grafts, grafts of native inputs ignored"
+  '()
+  (let* ((new   (dummy-package "native-dep"
+                  (version "0.1")
+                  (arguments '(#:implicit-inputs? #f))))
+         (ndep  (package (inherit new) (version "0.0")
+                         (replacement new)))
+         (dep   (dummy-package "dep"
+                  (arguments '(#:implicit-inputs? #f))))
+         (dummy (dummy-package "dummy"
+                  (arguments '(#:implicit-inputs? #f))
+                  (native-inputs `(("ndep" ,ndep)))
+                  (inputs `(("dep" ,dep))))))
+    (package-grafts %store dummy)))
+
 (test-assert "package-grafts, indirect grafts"
   (let* ((new   (dummy-package "dep"
                   (arguments '(#:implicit-inputs? #f))))