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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu image)
+  #:use-module (guix records)
+  #:export (partition
+            partition?
+            partition-device
+            partition-size
+            partition-file-system
+            partition-label
+            partition-uuid
+            partition-flags
+            partition-initializer
+
+            image
+            image-name
+            image-format
+            image-size
+            image-operating-system
+            image-partitions
+            image-compression?
+            image-volatile-root?
+            image-substitutable?))
+
+
+;;;
+;;; Partition record.
+;;;
+
+(define-record-type* <partition> partition make-partition
+  partition?
+  (device      partition-device (default #f))
+  (size        partition-size)
+  (file-system partition-file-system (default "ext4"))
+  (label       partition-label (default #f))
+  (uuid        partition-uuid (default #f))
+  (flags       partition-flags (default '()))
+  (initializer partition-initializer (default #f)))
+
+
+;;;
+;;; Image record.
+;;;
+
+(define-record-type* <image>
+  image make-image
+  image?
+  (format             image-format) ;symbol
+  (size               image-size  ;size in bytes as integer
+                      (default 'guess))
+  (operating-system   image-operating-system  ;<operating-system>
+                      (default #f))
+  (partitions         image-partitions ;list of <partition>
+                      (default '()))
+  (compression?       image-compression? ;boolean
+                      (default #t))
+  (volatile-root?     image-volatile-root? ;boolean
+                      (default #t))
+  (substitutable?     image-substitutable? ;boolean
+                      (default #t)))