gnu: commencement: Use system in %final-inputs.

Otherwise this causes odd issues, I presume arising from when %current-system
differs from the system argument passed to %final-inputs.

* gnu/packages/commencement.scm (%final-inputs): Set %current-system to
system.
* gnu/packages/base.scm (%final-inputs): Add optional system parameter.
* gnu/ci.scm (base-packages): New procedure to memoize the base packages
depending on system.
(package->job): Pass system to base-packages.

Co-authored-by: Josselin Poiret <dev@jpoiret.xyz>
Signed-off-by: Josselin Poiret <dev@jpoiret.xyz>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/ci.scm

@@ -24,6 +24,7 @@
   #:use-module (guix build-system channel)
   #:use-module (guix config)
   #:autoload   (guix describe) (package-channels)
+  #:use-module (guix memoization)
   #:use-module (guix store)
   #:use-module (guix profiles)
   #:use-module (guix packages)
@@ -342,19 +343,22 @@ otherwise use the IMAGE name."
   ;; Return the name of a package's job.
   package-name)
 
-(define package->job
-  (let ((base-packages
+(define base-packages
+  (mlambda (system)
+    "Return the set of packages considered to be part of the base for SYSTEM."
     (delete-duplicates
      (append-map (match-lambda
                    ((_ package _ ...)
                     (match (package-transitive-inputs package)
                       (((_ inputs _ ...) ...)
                        inputs))))
-                      (%final-inputs)))))
+                 (%final-inputs system)))))
+
+(define package->job
   (lambda* (store package system #:key (suffix ""))
     "Return a job for PACKAGE on SYSTEM, or #f if this combination is not
 valid.  Append SUFFIX to the job name."
-      (cond ((member package base-packages)
+    (cond ((member package (base-packages system))
            (package-job store (string-append "base." (job-name package))
                         package system #:suffix suffix))
           ((supported-package? package system)
@@ -364,7 +368,7 @@ valid.  Append SUFFIX to the job name."
                   (package-job store (job-name package)
                                package system #:suffix suffix))))
           (else
-             #f)))))
+           #f))))
 
 (define %x86-64-micro-architectures
   ;; Micro-architectures for which we build tuned variants.

gnu/packages/base.scm

@@ -78,7 +78,8 @@
   #:export (glibc
             libc-for-target
             make-ld-wrapper
-            libiconv-if-needed))
+            libiconv-if-needed
+            %final-inputs))
 
 ;;; Commentary:
 ;;;
@@ -1648,10 +1649,10 @@ package needs iconv ,@(libiconv-if-needed) should be added."
          (proc  (module-ref iface 'canonical-package)))
     (proc package)))
 
-(define-public (%final-inputs)
+(define* (%final-inputs #:optional (system (%current-system)))
   "Return the list of \"final inputs\"."
   ;; Avoid circular dependency by lazily resolving 'commencement'.
   (let ((iface (resolve-interface '(gnu packages commencement))))
-    ((module-ref iface '%final-inputs) (%current-system))))
+    ((module-ref iface '%final-inputs) system)))
 
 ;;; base.scm ends here

gnu/packages/commencement.scm

@@ -3459,6 +3459,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
     ;; still use 'package-with-bootstrap-guile' so that the bootstrap tools are
     ;; used for origins that have patches, thereby avoiding circular
     ;; dependencies.
+    (parameterize ((%current-system system))
       (let ((finalize (compose with-boot6
                                package-with-bootstrap-guile)))
         `(,@(map (match-lambda
@@ -3483,7 +3484,7 @@ exec ~a/bin/~a-~a -B~a/lib -Wl,-dynamic-linker -Wl,~a/~a \"$@\"~%"
           ("gcc" ,gcc-final)
           ("libc" ,glibc-final)
           ("libc:static" ,glibc-final "static")
-        ("locales" ,glibc-utf8-locales-final)))))
+          ("locales" ,glibc-utf8-locales-final))))))
 
 (define-public canonical-package
   (let ((name->package (mlambda (system)