Remove VM generation dead-code.

This code duplicates the (gnu system image) and (gnu build image) code. Using
VM for image generation is not needed, not portable and really slow. Remove
all the VM image generation code to make sure that only the image API is used.

* gnu/build/vm.scm: Remove it. Move the qemu-command procedure to ...
* gnu/build/marionette.scm: ... here.
* gnu/local.mk (GNU_SYSTEM_MODULES): Adapt it.
* tests/modules.scm: Ditto.
* gnu/tests/install.scm: Ditto.
* gnu/system/vm.scm: Adapt it and remove expression->derivation-in-linux-vm,
qemu-img, system-qemu-image/shared-store and system-docker-image procedures.
* doc/guix.texi (G-Expressions): Adapt it.

1 files changed, 13 insertions, 1 deletions

diff --git a/gnu/build/marionette.scm b/gnu/build/marionette.scm
index 0ebe535526..b336024610 100644
--- a/gnu/build/marionette.scm
+++ b/gnu/build/marionette.scm
@@ -24,6 +24,7 @@
   #:use-module (rnrs io ports)
   #:use-module (ice-9 match)
   #:use-module (ice-9 popen)
+  #:use-module (ice-9 regex)
   #:export (marionette?
             make-marionette
             marionette-eval
@@ -36,7 +37,8 @@
             %qwerty-us-keystrokes
             marionette-type
 
-            system-test-runner))
+            system-test-runner
+            qemu-command))
 
 ;;; Commentary:
 ;;;
@@ -426,4 +428,14 @@ LOG-DIRECTORY is specified, create log file within it."
           (exit success?))))
     runner))
 
+(define* (qemu-command #:optional (system %host-type))
+  "Return the default name of the QEMU command for SYSTEM."
+  (let ((cpu (substring system 0
+                        (string-index system #\-))))
+    (string-append "qemu-system-"
+                   (cond
+                    ((string-match "^i[3456]86$" cpu) "i386")
+                    ((string-match "armhf" cpu) "arm")
+                    (else cpu)))))
+
 ;;; marionette.scm ends here