[bug#73654] [PATCH] gnu: luks-device-mapping-with-options: Add allow-discards? argument.

[Sisiutl <sisiutl@egregore.fun>]

* gnu/system/mapped-devices.scm (luks-device-mapping-with-options): Add allow-discards? argument.

Change-Id: I0a43c13570a223d17698c7fe9ef4607e587bb8d0
---
 gnu/system/mapped-devices.scm | 36 +++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/gnu/system/mapped-devices.scm b/gnu/system/mapped-devices.scm
index 931c371425..674e8708a4 100644
--- a/gnu/system/mapped-devices.scm
+++ b/gnu/system/mapped-devices.scm
@@ -189,12 +189,12 @@ (define missing
              (&error-location
               (location (source-properties->location location))))))))
 
-\f
+
 ;;;
 ;;; Common device mappings.
 ;;;
 
-(define* (open-luks-device source targets #:key key-file)
+(define* (open-luks-device source targets #:key key-file allow-discards?)
   "Return a gexp that maps SOURCE to TARGET as a LUKS device, using
 'cryptsetup'."
   (with-imported-modules (source-module-closure
@@ -234,17 +234,19 @@ (define* (open-luks-device source targets #:key key-file)
                                             (loop (- tries-left 1))))))
                           (error "LUKS partition not found" source))
                       source)))
-             ;; We want to fallback to the password unlock if the keyfile fails.
-             (or (and keyfile
-                      (zero? (system*/tty
-                              #$(file-append cryptsetup-static "/sbin/cryptsetup")
-                              "open" "--type" "luks"
-                              "--key-file" keyfile
-                              partition #$target)))
-                 (zero? (system*/tty
-                         #$(file-append cryptsetup-static "/sbin/cryptsetup")
-                         "open" "--type" "luks"
-                         partition #$target)))))))))
+             (let* ((cryptsetup-flags (list "open" "--type" "luks" partition #$target))
+                    (cryptsetup-flags (if allow-discards?
+                                          (cons "--allow-discards" cryptsetup-flags)
+                                          cryptsetup-flags)))
+               ;; We want to fallback to the password unlock if the keyfile fails.
+               (or (and keyfile
+                        (zero? (apply system*/tty
+                                      #$(file-append cryptsetup-static "/sbin/cryptsetup")
+                                      "--key-file" keyfile
+                                      cryptsetup-flags)))
+                   (zero? (apply system*/tty
+                                 #$(file-append cryptsetup-static "/sbin/cryptsetup")
+                                 cryptsetup-flags))))))))))
 
 (define (close-luks-device source targets)
   "Return a gexp that closes TARGET, a LUKS device."
@@ -286,13 +288,15 @@ (define luks-device-mapping
               ((gnu build file-systems)
                #:select (find-partition-by-luks-uuid system*/tty))))))
 
-(define* (luks-device-mapping-with-options #:key key-file)
+(define* (luks-device-mapping-with-options #:key key-file allow-discards?)
   "Return a luks-device-mapping object with open modified to pass the arguments
 into the open-luks-device procedure."
   (mapped-device-kind
    (inherit luks-device-mapping)
-   (open (λ (source targets) (open-luks-device source targets
-                                               #:key-file key-file)))))
+   (open (λ (source targets)
+           (open-luks-device source targets
+                             #:key-file key-file
+                             #:allow-discards? allow-discards?)))))
 
 (define (open-raid-device sources targets)
   "Return a gexp that assembles SOURCES (a list of devices) to the RAID device
-- 
2.46.0