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-rw-r--r--gnu/system/file-systems.scm15
1 files changed, 15 insertions, 0 deletions
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."