system: Add kernel-loadable-modules to operating-system.

* gnu/system.scm (<operating-system>): Add kernel-loadable-modules.
(operating-system-directory-base-entries): Use it.
* doc/guix.texi (operating-system Reference): Document
KERNEL-LOADABLE-MODULES.
* gnu/build/linux-modules.scm (depmod): New procedure.
(make-linux-module-directory): New procedure.  Export it.
* guix/profiles.scm (linux-module-database): New procedure.  Export it.
* gnu/tests/linux-modules.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/linux.scm (make-linux-libre*)[arguments]<#:phases>[install]:
Disable depmod.  Remove "build" and "source" symlinks.
[native-inputs]: Remove kmod.

gnu/build/linux-modules.scm

@@ -22,12 +22,14 @@
   #:use-module (guix elf)
   #:use-module (guix glob)
   #:use-module (guix build syscalls)
-  #:use-module ((guix build utils) #:select (find-files))
+  #:use-module ((guix build utils) #:select (find-files invoke))
+  #:use-module (guix build union)
   #:use-module (rnrs io ports)
   #:use-module (rnrs bytevectors)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-26)
+  #:use-module (ice-9 ftw)
   #:use-module (ice-9 vlist)
   #:use-module (ice-9 match)
   #:use-module (ice-9 rdelim)
@@ -56,7 +58,9 @@
 
             write-module-name-database
             write-module-alias-database
-            write-module-device-database))
+            write-module-device-database
+
+            make-linux-module-directory))
 
 ;;; Commentary:
 ;;;
@@ -631,4 +635,42 @@ be loaded on-demand, such as file system modules."
                            module devname type major minor)))
                 aliases))))
 
+(define (depmod version directory)
+  "Given an (existing) DIRECTORY, invoke depmod on it for
+kernel version VERSION."
+  (let ((destination-directory (string-append directory "/lib/modules/"
+                                              version))
+        ;; Note: "System.map" is an input file.
+        (maps-file (string-append directory "/System.map"))
+        ;; Note: "Module.symvers" is an input file.
+        (symvers-file (string-append directory "/Module.symvers")))
+    ;; These files will be regenerated by depmod below.
+    (for-each (lambda (basename)
+                (when (and (string-prefix? "modules." basename)
+                           ;; Note: "modules.builtin" is an input file.
+                           (not (string=? "modules.builtin" basename))
+                           ;; Note: "modules.order" is an input file.
+                           (not (string=? "modules.order" basename)))
+                  (delete-file (string-append destination-directory "/"
+                                              basename))))
+              (scandir destination-directory))
+    (invoke "depmod"
+            "-e" ; Report symbols that aren't supplied
+            ;"-w" ; Warn on duplicates
+            "-b" directory
+            "-F" maps-file
+            ;"-E" symvers-file ; using both "-E" and "-F" is not possible.
+            version)))
+
+(define (make-linux-module-directory inputs version output)
+  "Create a new directory OUTPUT and ensure that the directory
+OUTPUT/lib/modules/VERSION can be used as a source of Linux
+kernel modules for the first kmod in PATH now to eventually
+load.  Take modules to put into OUTPUT from INPUTS.
+
+Right now that means it creates @code{modules.*.bin} which
+@command{modprobe} will use to find loadable modules."
+  (union-build output inputs #:create-all-directories? #t)
+  (depmod version output))
+
 ;;; linux-modules.scm ends here