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gnu: build: file-systems: Add find-uuid procedure.

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* gnu/build/file-systems.scm (block-devices, uuids, find-uuid): Add
procedures.
* gnu/system/uuid.scm (file-system->uuid-type): Add procedure.

Change-Id: I8b4f3ad9fe5138d5c09ce24ded70fa53364550dc
This commit is contained in:
Herman Rimm 2024-09-29 11:24:51 +02:00 committed by Ryan Schanzenbacher
parent 92ecc0adfa
commit 5b7b514e4d
Signed by: ryan77627
GPG key ID: 81B0E222A3E2308E
2 changed files with 32 additions and 3 deletions
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23
gnu/build/file-systems.scm
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@ -9,6 +9,7 @@
;;; Copyright © 2022 Oleg Pykhalov <go.wigust@gmail.com>
;;; Copyright © 2024 Nicolas Graves <ngraves@ngraves.fr>
;;; Copyright © 2024 Richard Sent <richard@freakingpenguin.com>
;;; Copyright © 2024 Herman Rimm <herman@rimm.ee>
;;;
;;; This file is part of GNU Guix.
;;;
@ -45,6 +46,7 @@ (define-module (gnu build file-systems)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:export (disk-partitions
block-devices
partition-label-predicate
partition-uuid-predicate
partition-luks-uuid-predicate
@ -57,6 +59,9 @@ (define-module (gnu build file-systems)
read-partition-uuid
read-luks-partition-uuid
uuids
find-uuid
cleanly-unmounted-ext2?
bind-mount
@ -994,6 +999,20 @@ (define (partition? name major minor)
(loop (cons name parts))
(loop parts))))))))))
(define (block-devices)
"Return the block devices of valid disk partitions."
(map (cut string-append "/dev/" <>) (disk-partitions)))
(define (uuids)
"Return the uuids in use by the system as a list of <uuid> records."
(filter-map read-partition-uuid (block-devices)))
(define (find-uuid str)
"Return the current UUID which gets printed as STR, or #f otherwise."
(define (str? uuid)
(and (string=? str (uuid->string uuid)) uuid))
(any str? (uuids)))
(define (ENOENT-safe proc)
"Wrap the one-argument PROC such that ENOENT, EIO, and ENOMEDIUM errors are
caught and lead to a warning and #f as the result."
@ -1123,9 +1142,7 @@ (define (find-partition predicate)
"Return the first partition found that matches PREDICATE, or #f if none
were found."
(lambda (expected)
(find (predicate expected)
(map (cut string-append "/dev/" <>)
(disk-partitions)))))
(find (predicate expected) (block-devices))))
(define find-partition-by-label
(find-partition partition-label-predicate))

12
gnu/system/uuid.scm
View file

@ -2,6 +2,8 @@
;;; Copyright © 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Danny Milosavljevic <dannym@scratchpost.org>
;;; Copyright © 2019–2020, 2024 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2024 Lilah Tascheter <lilah@lunabee.space>
;;; Copyright © 2024 Herman Rimm <herman@rimm.ee>
;;;
;;; This file is part of GNU Guix.
;;;
@ -32,6 +34,7 @@ (define-module (gnu system uuid)
uuid-bytevector
uuid=?
file-system->uuid-type
bytevector->uuid
uuid->string
@ -268,6 +271,15 @@ (define %uuid-printers
('exfat 'fat32 'fat16 'fat => fat-uuid->string)
('ntfs => ntfs-uuid->string)))
(define (file-system->uuid-type str)
"Convert a file system STR into a uuid-type symbol."
(match str
;; XXX: (When) do "fat" and "fat32" occur?
((or "exfat" "vfat" "fat32" "fat16") 'fat)
("ntfs" 'ntfs)
("iso9660" 'iso9660)
((? string?) 'dce)))
(define* (string->uuid str #:optional (type 'dce))
"Parse STR as a UUID of the given TYPE. On success, return the
corresponding bytevector; otherwise return #f."