derivations: 'derivation' and related procedures return a single value.

* guix/derivations.scm (derivation->output-path,
  derivation->output-paths): New procedures.
  (derivation-path->output-path): Use 'derivation->output-path'.
  (derivation-path->output-paths): Use 'derivation->output-paths'.
  (derivation): Accept 'derivation?' objects as inputs.  Return a single
  value.
  (build-derivations): New procedure.
  (compiled-modules): Use 'derivation->output-paths'.
  (build-expression->derivation)[source-path]: Add case for when the
  input matches 'derivation?'.
  [prologue]: Accept 'derivation?' objects in INPUTS.
  [mod-dir, go-dir]: Use 'derivation->output-path'.
* guix/download.scm (url-fetch): Adjust to the single-value return.
* guix/packages.scm (package-output): Use 'derivation->output-path'.
* guix/scripts/build.scm (guix-build): When the argument is
  'derivation-path?', pass it through 'read-derivation'.
  Use 'derivation-file-name' to print out the .drv file names, and to
  register them.  Use 'derivation->output-path' instead of
  'derivation-path->output-path'.
* guix/scripts/package.scm (roll-back): Adjust to the single-value
  return.
  (guix-package): Use 'derivation->output-path'.
* guix/ui.scm (show-what-to-build): Adjust to deal with 'derivation?'
  objects instead of .drv file names.
* gnu/system/grub.scm (grub-configuration-file): Use
  'derivation->output-path' instead of 'derivation-path->output-path'.
* gnu/system/vm.scm (qemu-image, system-qemu-image): Likewise.
* tests/builders.scm, tests/derivations.scm, tests/packages.scm,
  tests/store.scm, tests/union.scm: Adjust to the new calling
  convention.
* doc/guix.texi (Defining Packages, The Store, Derivations): Adjust
  accordingly.

1 files changed, 3 insertions, 3 deletions

diff --git a/gnu/system/grub.scm b/gnu/system/grub.scm
index 695a044bfa..b2438b9c5b 100644
--- a/gnu/system/grub.scm
+++ b/gnu/system/grub.scm
@@ -56,7 +56,7 @@ search.file ~a~%"
             (any (match-lambda
                   (($ <menu-entry> _ linux)
                    (let* ((drv (package-derivation store linux system))
-                          (out (derivation-path->output-path drv)))
+                          (out (derivation->output-path drv)))
                      (string-append out "/bzImage"))))
                  entries)))
 
@@ -71,9 +71,9 @@ search.file ~a~%"
   initrd ~a/initrd
 }~%"
                 label
-                (derivation-path->output-path linux-drv)
+                (derivation->output-path linux-drv)
                 (string-join arguments)
-                (derivation-path->output-path initrd-drv))))))
+                (derivation->output-path initrd-drv))))))
 
   (add-text-to-store store "grub.cfg"
                      (string-append prologue