bug#26544: [PATCH v2 8/8] system: grub: Use boot-parameters instead of menu-entry where possible.

[Danny Milosavljevic]

* gnu/system/grub.scm (boot-parameters->menu-entry): New variable.
(grub-configuration-file): Use boot-parameters
instead of menu-entry where possible.
* guix/scripts/system.scm (profile-boot-parameters): Update docstring.
(reinstall-grub): Use profile-boot-parameters.
(perform-action): Use profile-boot-parameters.
---
 gnu/system/grub.scm     | 14 ++++++++++++--
 guix/scripts/system.scm | 22 +++++++++-------------
 2 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/gnu/system/grub.scm b/gnu/system/grub.scm
index cde4b9e23..d2fa984ec 100644
--- a/gnu/system/grub.scm
+++ b/gnu/system/grub.scm
@@ -267,6 +267,16 @@ code."
         (#f
          #~(format #f "search --file --set ~a" #$file)))))
 
+(define (boot-parameters->menu-entry conf)
+  "Convert a <boot-parameters> instance to a corresponding <menu-entry>."
+  (menu-entry
+   (label (boot-parameters-label conf))
+   (device (boot-parameters-store-device conf))
+   (device-mount-point (boot-parameters-store-mount-point conf))
+   (linux (boot-parameters-kernel conf))
+   (linux-arguments (boot-parameters-kernel-arguments conf))
+   (initrd (boot-parameters-initrd conf))))
+
 (define* (grub-configuration-file config entries
                                   #:key
                                   (system (%current-system))
@@ -276,7 +286,7 @@ code."
 <file-system> object.  OLD-ENTRIES is taken to be a list of menu entries
 corresponding to old generations of the system."
   (define all-entries
-    (append entries
+    (append (map boot-parameters->menu-entry entries)
             (grub-configuration-menu-entries config)))
 
   (define entry->gexp
@@ -323,7 +333,7 @@ set timeout=~a~%"
             #$@(if (pair? old-entries)
                    #~((format port "
 submenu \"GNU system, old configurations...\" {~%")
-                      #$@(map entry->gexp old-entries)
+                      #$@(map entry->gexp (map boot-parameters->menu-entry 
old-entries))
                       (format port "}~%"))
                    #~()))))
 
diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index 378138c26..dade5eb85 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -365,12 +365,11 @@ it atomically, and then run OS's activation script."
 
 (define* (profile-boot-parameters #:optional (profile %system-profile)
                                   (numbers (generation-numbers profile)))
-  "Return a list of 'menu-entry' for the generations of PROFILE specified by
-NUMBERS, which is a list of generation numbers."
+  "Return a list of 'boot-parameters' for the generations of PROFILE specified
+by NUMBERS, which is a list of generation numbers."
   (define (system->boot-parameters system number time)
     (unless-file-not-found
-     (let* ((file             (string-append system "/parameters"))
-            (params           (read-boot-parameters-file file)))
+     (let* ((params           (read-boot-parameters-file system)))
        params)))
   (let* ((systems (map (cut generation-file-name profile <>)
                        numbers))
@@ -386,8 +385,7 @@ NUMBERS, which is a list of generation numbers."
 NUMBERS, which is a list of generation numbers."
   (define (system->grub-entry system number time)
     (unless-file-not-found
-     (let* ((file             (string-append system "/parameters"))
-            (params           (read-boot-parameters-file file))
+     (let* ((params           (read-boot-parameters-file system))
             (label            (boot-parameters-label params))
             (root             (boot-parameters-root-device params))
             (root-device      (if (bytevector? root)
@@ -445,18 +443,17 @@ generation as its default entry.  STORE is an open 
connection to the store."
   "Re-install grub for existing system profile generation NUMBER.  STORE is an
 open connection to the store."
   (let* ((generation (generation-file-name %system-profile number))
-         (file (string-append generation "/parameters"))
          (params (unless-file-not-found
-                  (read-boot-parameters-file file)))
+                  (read-boot-parameters-file generation)))
          (root-device (boot-parameters-root-device params))
          ;; We don't currently keep track of past menu entries' details.  The
          ;; default values will allow the system to boot, even if they differ
          ;; from the actual past values for this generation's entry.
          (grub-config (grub-configuration (device root-device)))
          ;; Make the specified system generation the default entry.
-         (entries (profile-grub-entries %system-profile (list number)))
+         (entries (profile-boot-parameters %system-profile (list number)))
          (old-generations (delv number (generation-numbers %system-profile)))
-         (old-entries (profile-grub-entries %system-profile old-generations))
+         (old-entries (profile-boot-parameters %system-profile 
old-generations))
          (grub.cfg (run-with-store store
                      (grub-configuration-file grub-config
                                               entries
@@ -531,8 +528,7 @@ list of services."
   "Display a summary of system generation NUMBER in a human-readable format."
   (unless (zero? number)
     (let* ((generation  (generation-file-name profile number))
-           (param-file  (string-append generation "/parameters"))
-           (params      (read-boot-parameters-file param-file))
+           (params      (read-boot-parameters-file generation))
            (label       (boot-parameters-label params))
            (root        (boot-parameters-root-device params))
            (root-device (if (bytevector? root)
@@ -641,7 +637,7 @@ output when building a system derivation, such as a disk 
image."
                       (operating-system-bootcfg os
                                                 (if (eq? 'init action)
                                                     '()
-                                                    (profile-grub-entries)))))
+                                                    
(profile-boot-parameters)))))
 
        ;; For 'init' and 'reconfigure', always build GRUB.CFG, even if
        ;; --no-grub is passed, because GRUB.CFG because we then use it as a GC