image: Add 'target' support.

* gnu/image.scm (<image>)[target]: New field,
(image-target): new public method.
* gnu/system/image.scm (hurd-disk-image): Set "i586-pc-gnu" as image 'target'
field,
(maybe-with-target): new procedure,
(system-image): honor image 'target' field using the above procedure.

1 files changed, 3 insertions, 0 deletions

diff --git a/gnu/image.scm b/gnu/image.scm
index 0a92d168e96..19b466527bc 100644
--- a/gnu/image.scm
+++ b/gnu/image.scm
@@ -33,6 +33,7 @@
             image
             image-name
             image-format
+            image-target
             image-size
             image-operating-system
             image-partitions
@@ -67,6 +68,8 @@
   image make-image
   image?
   (format             image-format) ;symbol
+  (target             image-target
+                      (default #f))
   (size               image-size  ;size in bytes as integer
                       (default 'guess))
   (operating-system   image-operating-system  ;<operating-system>