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authorLudovic Courtès <ludo@gnu.org>2016-04-18 00:23:16 +0200
committerLudovic Courtès <ludo@gnu.org>2016-04-18 01:24:06 +0200
commitffba7d498d36618ad21af3961a1a685ae91bae57 (patch)
tree5fbd5b0fbf82379ec5a03eaaabc9f8b58192f735 /gnu/system/mapped-devices.scm
parent4da8c19e8337cbb908d5e77cd912791846070fb7 (diff)
mapped-devices: LUKS partitions can be designated by their UUID.
* gnu/system/mapped-devices.scm (device-mapping-service-type): Add 'modules' and 'imported-modules' fields to 'shepherd-service'. (open-luks-device): Use 'find-partition-by-luks-uuid' to lookup the partition when SOURCE is a bytevector. * gnu/system/linux-initrd.scm (base-initrd): Augment 'use-modules' form. * doc/guix.texi (Mapped Devices): Give example with a UUID.
Diffstat (limited to 'gnu/system/mapped-devices.scm')
-rw-r--r--gnu/system/mapped-devices.scm29
1 files changed, 25 insertions, 4 deletions
diff --git a/gnu/system/mapped-devices.scm b/gnu/system/mapped-devices.scm
index 2706e255c5..450b4737ac 100644
--- a/gnu/system/mapped-devices.scm
+++ b/gnu/system/mapped-devices.scm
@@ -22,6 +22,7 @@
#:use-module (gnu services)
#:use-module (gnu services shepherd)
#:autoload (gnu packages cryptsetup) (cryptsetup)
+ #:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (mapped-device
mapped-device?
@@ -77,7 +78,16 @@
(documentation "Map a device node using Linux's device mapper.")
(start #~(lambda () #$(open source target)))
(stop #~(lambda _ (not #$(close source target))))
- (respawn? #f))))))
+ (respawn? #f)
+
+ ;; Add the modules needed by LUKS-DEVICE-MAPPING.
+ ;; FIXME: This info should be propagated via gexps.
+ (modules `((rnrs bytevectors) ;bytevector?
+ ((gnu build file-systems)
+ #:select (find-partition-by-luks-uuid))
+ ,@%default-modules))
+ (imported-modules `((gnu build file-systems)
+ ,@%default-imported-modules)))))))
(define (device-mapping-service mapped-device)
"Return a service that sets up @var{mapped-device}."
@@ -91,9 +101,20 @@
(define (open-luks-device source target)
"Return a gexp that maps SOURCE to TARGET as a LUKS device, using
'cryptsetup'."
- #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
- "open" "--type" "luks"
- #$source #$target)))
+ #~(let ((source #$source))
+ (zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup")
+ "open" "--type" "luks"
+
+ ;; Note: We cannot use the "UUID=source" syntax here
+ ;; because 'cryptsetup' implements it by searching the
+ ;; udev-populated /dev/disk/by-id directory but udev may
+ ;; be unavailable at the time we run this.
+ (if (bytevector? source)
+ (or (find-partition-by-luks-uuid source)
+ (error "LUKS partition not found" source))
+ source)
+
+ #$target))))
(define (close-luks-device source target)
"Return a gexp that closes TARGET, a LUKS device."