HCoop / jackhill / guix / guix.git / blame
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1 | ;;; GNU Guix --- Functional package management for GNU |
| 2 | ;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org> | |
| 3 | ;;; | |
| 4 | ;;; This file is part of GNU Guix. | |
| 5 | ;;; | |
| 6 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
| 7 | ;;; under the terms of the GNU General Public License as published by | |
| 8 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
| 9 | ;;; your option) any later version. | |
| 10 | ;;; | |
| 11 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
| 12 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | ;;; GNU General Public License for more details. | |
| 15 | ;;; | |
| 16 | ;;; You should have received a copy of the GNU General Public License | |
| 17 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
| 18 | ||
| 19 | (define-module (gnu system mapped-devices) | |
| 374f14c2 | 20 | #:use-module (guix gexp) |
| 060d62a7 | 21 | #:use-module (guix records) |
| 374f14c2 | 22 | #:autoload (gnu packages cryptsetup) (cryptsetup) |
| 060d62a7 LC |
23 | #:export (mapped-device |
| 24 | mapped-device? | |
| 25 | mapped-device-source | |
| 26 | mapped-device-target | |
| 27 | mapped-device-type | |
| 28 | ||
| 29 | mapped-device-kind | |
| 30 | mapped-device-kind? | |
| 31 | mapped-device-kind-open | |
| 374f14c2 LC |
32 | mapped-device-kind-close |
| 33 | ||
| 34 | luks-device-mapping)) | |
| 060d62a7 LC |
35 | |
| 36 | ;;; Commentary: | |
| 37 | ;;; | |
| 38 | ;;; This module supports "device mapping", a concept implemented by Linux's | |
| 39 | ;;; device-mapper. | |
| 40 | ;;; | |
| 41 | ;;; Code: | |
| 42 | ||
| 43 | (define-record-type* <mapped-device> mapped-device | |
| 44 | make-mapped-device | |
| 45 | mapped-device? | |
| 46 | (source mapped-device-source) ;string | |
| 47 | (target mapped-device-target) ;string | |
| 48 | (type mapped-device-type)) ;<mapped-device-kind> | |
| 49 | ||
| 50 | (define-record-type* <mapped-device-type> mapped-device-kind | |
| 51 | make-mapped-device-kind | |
| 52 | mapped-device-kind? | |
| 53 | (open mapped-device-kind-open) ;source target -> gexp | |
| 54 | (close mapped-device-kind-close ;source target -> gexp | |
| 55 | (default (const #~(const #f))))) | |
| 56 | ||
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57 | \f |
| 58 | ;;; | |
| 59 | ;;; Common device mappings. | |
| 60 | ;;; | |
| 61 | ||
| 62 | (define (open-luks-device source target) | |
| 63 | "Return a gexp that maps SOURCE to TARGET as a LUKS device, using | |
| 64 | 'cryptsetup'." | |
| 65 | #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup") | |
| 66 | "open" "--type" "luks" | |
| 67 | #$source #$target))) | |
| 68 | ||
| 69 | (define (close-luks-device source target) | |
| 70 | "Return a gexp that closes TARGET, a LUKS device." | |
| 71 | #~(zero? (system* (string-append #$cryptsetup "/sbin/cryptsetup") | |
| 72 | "close" #$target))) | |
| 73 | ||
| 74 | (define luks-device-mapping | |
| 75 | ;; The type of LUKS mapped devices. | |
| 76 | (mapped-device-kind | |
| 77 | (open open-luks-device) | |
| 78 | (close close-luks-device))) | |
| 79 | ||
| 060d62a7 | 80 | ;;; mapped-devices.scm ends here |