[bug#42634] [PATCH 3/3] scripts: system: Add support for image-type.

[Mathieu Othacehe]

* guix/scripts/system.scm (list-image-types): New procedure,
(%options): add "image-type" and "list-image-types" options, remove
"file-system-type" option,
(show-help): adapt accordingly,
(%default-options): also adapt, and set the default "image-type" to "raw",
(perform-action): add image-type argument and remove file-system-type argument,
(process-action):  adapt perform-action call,
(system-derivation-for-action): remove base-image
argument, add image-type argument, and use it to create the image passed to
"system-image".
---
 guix/scripts/system.scm | 56 +++++++++++++++++++++++++----------------
 1 file changed, 35 insertions(+), 21 deletions(-)

diff --git a/guix/scripts/system.scm b/guix/scripts/system.scm
index bfd50c7a79..4962401f36 100644
--- a/guix/scripts/system.scm
+++ b/guix/scripts/system.scm
@@ -659,8 +659,8 @@ checking this by themselves in their 'check' procedure."
 ;;; Action.
 ;;;
 
-(define* (system-derivation-for-action os base-image action
-                                       #:key image-size file-system-type
+(define* (system-derivation-for-action os action
+                                       #:key image-size image-type
                                        full-boot? container-shared-network?
                                        mappings)
   "Return as a monadic value the derivation for OS according to ACTION."
@@ -686,9 +686,8 @@ checking this by themselves in their 'check' procedure."
      (lower-object
       (system-image
        (image
-        (inherit base-image)
-        (size image-size)
-        (operating-system os)))))
+        (inherit (os->image os #:type image-type))
+        (size image-size)))))
     ((docker-image)
      (system-docker-image os #:shared-network? container-shared-network?))))
 
@@ -741,16 +740,17 @@ and TARGET arguments."
                          install-bootloader?
                          dry-run? derivations-only?
                          use-substitutes? bootloader-target target
-                         image-size file-system-type full-boot?
-                         container-shared-network?
+                         image-size image-type
+                         full-boot? container-shared-network?
                          (mappings '())
                          (gc-root #f))
   "Perform ACTION for OS.  INSTALL-BOOTLOADER? specifies whether to install
 bootloader; BOOTLOADER-TAGET is the target for the bootloader; TARGET is the
 target root directory; IMAGE-SIZE is the size of the image to be built, for
-the 'vm-image' and 'disk-image' actions.  The root file system is created as a
-FILE-SYSTEM-TYPE file system.  FULL-BOOT? is used for the 'vm' action; it
-determines whether to boot directly to the kernel or to the bootloader.
+the 'vm-image' and 'disk-image' actions.  IMAGE-TYPE is the type of image to
+be built.
+FULL-BOOT? is used for the 'vm' action; it determines whether to boot directly
+to the kernel or to the bootloader.
 CONTAINER-SHARED-NETWORK? determines if the container will use a separate
 network namespace.
 
@@ -792,10 +792,8 @@ static checks."
       (check-initrd-modules os)))
 
   (mlet* %store-monad
-      ((target*   (current-target-system))
-       (image ->  (find-image file-system-type target*))
-       (sys       (system-derivation-for-action os image action
-                                                #:file-system-type 
file-system-type
+       ((sys       (system-derivation-for-action os action
+                                                #:image-type image-type
                                                 #:image-size image-size
                                                 #:full-boot? full-boot?
                                                 #:container-shared-network? 
container-shared-network?
@@ -876,6 +874,17 @@ upgrade, and restart each service that was not 
automatically restarted.\n"))))))
                   #:node-type (shepherd-service-node-type shepherds)
                   #:reverse-edges? #t)))
 
+
+;;;
+;;; Images.
+;;;
+
+(define (list-image-types)
+  "Print the available image types."
+  (display (G_ "The available image types are:\n"))
+  (newline)
+  (format #t "~{   - ~a ~%~}" (map image-type-name (force %image-types))))
+
 
 ;;;
 ;;; Options.
@@ -935,9 +944,9 @@ Some ACTIONS support additional ARGS.\n"))
                          apply STRATEGY (one of nothing-special, backtrace,
                          or debug) when an error occurs while reading FILE"))
   (display (G_ "
-      --file-system-type=TYPE
-                         for 'disk-image', produce a root file system of TYPE
-                         (one of 'ext4', 'iso9660')"))
+      --list-image-types list available image types"))
+  (display (G_ "
+  -t, --image-type=TYPE  for 'disk-image', produce an image of TYPE"))
   (display (G_ "
       --image-size=SIZE  for 'vm-image', produce an image of SIZE"))
   (display (G_ "
@@ -994,10 +1003,14 @@ Some ACTIONS support additional ARGS.\n"))
                  (lambda (opt name arg result)
                    (alist-cons 'on-error (string->symbol arg)
                                result)))
-         (option '(#\t "file-system-type") #t #f
+         (option '(#\t "image-type") #t #f
                  (lambda (opt name arg result)
-                   (alist-cons 'file-system-type arg
+                   (alist-cons 'image-type arg
                                result)))
+         (option '("list-image-types") #f #f
+                 (lambda (opt name arg result)
+                   (list-image-types)
+                   (exit 0)))
          (option '("image-size") #t #f
                  (lambda (opt name arg result)
                    (alist-cons 'image-size (size->number arg)
@@ -1063,7 +1076,7 @@ Some ACTIONS support additional ARGS.\n"))
     (debug . 0)
     (verbosity . #f)                              ;default
     (validate-reconfigure . ,ensure-forward-reconfigure)
-    (file-system-type . "ext4")
+    (image-type . "raw")
     (image-size . guess)
     (install-bootloader? . #t)))
 
@@ -1150,7 +1163,8 @@ resulting from command-line parsing."
                                (assoc-ref opts 'skip-safety-checks?)
                                #:validate-reconfigure
                                (assoc-ref opts 'validate-reconfigure)
-                               #:file-system-type (assoc-ref opts 
'file-system-type)
+                               #:image-type (lookup-image-type-by-name
+                                             (assoc-ref opts 'image-type))
                                #:image-size (assoc-ref opts 'image-size)
                                #:full-boot? (assoc-ref opts 'full-boot?)
                                #:container-shared-network?
-- 
2.26.2