From 99e676db43389af3a9e4c21734987c086fcaa8ed Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Date: Tue, 11 Feb 2020 23:56:45 -0500
Subject: file-systems: Add a 'file-system-device->string' procedure.

* gnu/system/file-systems.scm (file-system-device->string): New procedure.
* gnu/system.scm (bootable-kernel-arguments): Use it.
* gnu/system/vm.scm (operating-system-uuid): Likewise.
* guix/scripts/system.scm (display-system-generation): Likewise.
---
 gnu/system/file-systems.scm | 15 +++++++++++++++
 gnu/system/vm.scm           |  8 +-------
 2 files changed, 16 insertions(+), 7 deletions(-)

(limited to 'gnu/system')

diff --git a/gnu/system/file-systems.scm b/gnu/system/file-systems.scm
index d47a514b66..3b599efa8e 100644
--- a/gnu/system/file-systems.scm
+++ b/gnu/system/file-systems.scm
@@ -30,6 +30,7 @@
   #:export (file-system
             file-system?
             file-system-device
+            file-system-device->string
             file-system-title                     ;deprecated
             file-system-mount-point
             file-system-type
@@ -235,6 +236,20 @@ where both FILE1 and FILE2 are absolute file name.  For example:
               (()
                #f)))))))
 
+(define* (file-system-device->string device #:key uuid-type)
+  "Return the string representations of the DEVICE field of a <file-system>
+record.  When the device is a UUID, its representation is chosen depending on
+UUID-TYPE, a symbol such as 'dce or 'iso9660."
+  (match device
+    ((? file-system-label?)
+     (file-system-label->string device))
+    ((? uuid?)
+     (if uuid-type
+         (uuid->string (uuid-bytevector device) uuid-type)
+         (uuid->string device)))
+    ((? string?)
+     device)))
+
 (define (file-system-needed-for-boot? fs)
   "Return true if FS has the 'needed-for-boot?' flag set, or if it holds the
 store--e.g., if FS is the root file system."
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index 81b2e06ba2..03a511cdde 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -609,13 +609,7 @@ TYPE (one of 'iso9660 or 'dce).  Return a UUID object."
     (let ((device (file-system-device fs)))
       (list (file-system-mount-point fs)
             (file-system-type fs)
-            (cond ((file-system-label? device)
-                   (file-system-label->string device))
-                  ((uuid? device)
-                   (uuid->string device))
-                  ((string? device)
-                   device)
-                  (else #f))
+            (file-system-device->string device)
             (file-system-options fs))))
 
   (if (eq? type 'iso9660)
-- 
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