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060d62a7 | 1 | ;;; GNU Guix --- Functional package management for GNU |
59e80445 | 2 | ;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org> |
97c8aef1 | 3 | ;;; Copyright © 2016 Andreas Enge <andreas@enge.fr> |
3e5783e2 | 4 | ;;; Copyright © 2017, 2018 Mark H Weaver <mhw@netris.org> |
060d62a7 LC |
5 | ;;; |
6 | ;;; This file is part of GNU Guix. | |
7 | ;;; | |
8 | ;;; GNU Guix is free software; you can redistribute it and/or modify it | |
9 | ;;; under the terms of the GNU General Public License as published by | |
10 | ;;; the Free Software Foundation; either version 3 of the License, or (at | |
11 | ;;; your option) any later version. | |
12 | ;;; | |
13 | ;;; GNU Guix is distributed in the hope that it will be useful, but | |
14 | ;;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | ;;; GNU General Public License for more details. | |
17 | ;;; | |
18 | ;;; You should have received a copy of the GNU General Public License | |
19 | ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. | |
20 | ||
21 | (define-module (gnu system mapped-devices) | |
374f14c2 | 22 | #:use-module (guix gexp) |
060d62a7 | 23 | #:use-module (guix records) |
d2a1cf45 | 24 | #:use-module ((guix modules) #:hide (file-name->module-name)) |
42ff7d3b LC |
25 | #:use-module (guix i18n) |
26 | #:use-module ((guix utils) | |
27 | #:select (source-properties->location | |
8ab10c19 | 28 | &fix-hint |
42ff7d3b | 29 | &error-location)) |
1ea507bc LC |
30 | #:use-module (gnu services) |
31 | #:use-module (gnu services shepherd) | |
9b336338 | 32 | #:use-module (gnu system uuid) |
42ff7d3b | 33 | #:autoload (gnu build file-systems) (find-partition-by-luks-uuid) |
8ab10c19 | 34 | #:autoload (gnu build linux-modules) |
4cd386af | 35 | (missing-modules) |
b7d408ec | 36 | #:autoload (gnu packages cryptsetup) (cryptsetup-static) |
4ed2f515 | 37 | #:autoload (gnu packages linux) (mdadm-static) |
ffba7d49 | 38 | #:use-module (srfi srfi-1) |
424cea80 | 39 | #:use-module (srfi srfi-26) |
42ff7d3b LC |
40 | #:use-module (srfi srfi-34) |
41 | #:use-module (srfi srfi-35) | |
1ea507bc | 42 | #:use-module (ice-9 match) |
060d62a7 LC |
43 | #:export (mapped-device |
44 | mapped-device? | |
45 | mapped-device-source | |
46 | mapped-device-target | |
47 | mapped-device-type | |
4ca90ff5 | 48 | mapped-device-location |
060d62a7 LC |
49 | |
50 | mapped-device-kind | |
51 | mapped-device-kind? | |
52 | mapped-device-kind-open | |
374f14c2 | 53 | mapped-device-kind-close |
4ca90ff5 | 54 | mapped-device-kind-check |
374f14c2 | 55 | |
1ea507bc LC |
56 | device-mapping-service-type |
57 | device-mapping-service | |
58 | ||
8ab10c19 LC |
59 | check-device-initrd-modules ;XXX: needs a better place |
60 | ||
97c8aef1 AE |
61 | luks-device-mapping |
62 | raid-device-mapping)) | |
060d62a7 LC |
63 | |
64 | ;;; Commentary: | |
65 | ;;; | |
66 | ;;; This module supports "device mapping", a concept implemented by Linux's | |
67 | ;;; device-mapper. | |
68 | ;;; | |
69 | ;;; Code: | |
70 | ||
71 | (define-record-type* <mapped-device> mapped-device | |
72 | make-mapped-device | |
73 | mapped-device? | |
d6d1cea6 | 74 | (source mapped-device-source) ;string | list of strings |
060d62a7 | 75 | (target mapped-device-target) ;string |
4ca90ff5 LC |
76 | (type mapped-device-type) ;<mapped-device-kind> |
77 | (location mapped-device-location | |
78 | (default (current-source-location)) (innate))) | |
060d62a7 LC |
79 | |
80 | (define-record-type* <mapped-device-type> mapped-device-kind | |
81 | make-mapped-device-kind | |
82 | mapped-device-kind? | |
83 | (open mapped-device-kind-open) ;source target -> gexp | |
84 | (close mapped-device-kind-close ;source target -> gexp | |
4ca90ff5 LC |
85 | (default (const #~(const #f)))) |
86 | (check mapped-device-kind-check ;source -> Boolean | |
87 | (default (const #t)))) | |
060d62a7 | 88 | |
374f14c2 | 89 | \f |
1ea507bc LC |
90 | ;;; |
91 | ;;; Device mapping as a Shepherd service. | |
92 | ;;; | |
93 | ||
94 | (define device-mapping-service-type | |
95 | (shepherd-service-type | |
96 | 'device-mapping | |
97 | (match-lambda | |
4da8c19e LC |
98 | (($ <mapped-device> source target |
99 | ($ <mapped-device-type> open close)) | |
1ea507bc LC |
100 | (shepherd-service |
101 | (provision (list (symbol-append 'device-mapping- (string->symbol target)))) | |
102 | (requirement '(udev)) | |
103 | (documentation "Map a device node using Linux's device mapper.") | |
4da8c19e LC |
104 | (start #~(lambda () #$(open source target))) |
105 | (stop #~(lambda _ (not #$(close source target)))) | |
dfe06f6e | 106 | (respawn? #f)))))) |
1ea507bc | 107 | |
4da8c19e LC |
108 | (define (device-mapping-service mapped-device) |
109 | "Return a service that sets up @var{mapped-device}." | |
110 | (service device-mapping-service-type mapped-device)) | |
1ea507bc LC |
111 | |
112 | \f | |
8ab10c19 LC |
113 | ;;; |
114 | ;;; Static checks. | |
115 | ;;; | |
116 | ||
117 | (define (check-device-initrd-modules device linux-modules location) | |
118 | "Raise an error if DEVICE needs modules beyond LINUX-MODULES to operate. | |
119 | DEVICE must be a \"/dev\" file name." | |
4cd386af LC |
120 | (define missing |
121 | ;; Attempt to determine missing modules. | |
8ab10c19 LC |
122 | (catch 'system-error |
123 | (lambda () | |
4cd386af LC |
124 | (missing-modules device linux-modules)) |
125 | ||
126 | ;; If we can't do that (e.g., EPERM), skip the whole thing. | |
127 | (const '()))) | |
128 | ||
129 | (unless (null? missing) | |
130 | ;; Note: What we suggest here is a list of module names (e.g., | |
131 | ;; "usb_storage"), not file names (e.g., "usb-storage.ko"). This is | |
132 | ;; OK because we have machinery that accepts both the hyphen and the | |
133 | ;; underscore version. | |
134 | (raise (condition | |
135 | (&message | |
136 | (message (format #f (G_ "you may need these modules \ | |
8ab10c19 | 137 | in the initrd for ~a:~{ ~a~}") |
4cd386af LC |
138 | device missing))) |
139 | (&fix-hint | |
140 | (hint (format #f (G_ "Try adding them to the | |
8ab10c19 LC |
141 | @code{initrd-modules} field of your @code{operating-system} declaration, along |
142 | these lines: | |
143 | ||
144 | @example | |
145 | (operating-system | |
146 | ;; @dots{} | |
147 | (initrd-modules (append (list~{ ~s~}) | |
148 | %base-initrd-modules))) | |
88600acc LC |
149 | @end example |
150 | ||
151 | If you think this diagnostic is inaccurate, use the @option{--skip-checks} | |
152 | option of @command{guix system}.\n") | |
4cd386af LC |
153 | missing))) |
154 | (&error-location | |
155 | (location (source-properties->location location))))))) | |
8ab10c19 LC |
156 | |
157 | \f | |
374f14c2 LC |
158 | ;;; |
159 | ;;; Common device mappings. | |
160 | ;;; | |
161 | ||
162 | (define (open-luks-device source target) | |
163 | "Return a gexp that maps SOURCE to TARGET as a LUKS device, using | |
164 | 'cryptsetup'." | |
239c6e27 LC |
165 | (with-imported-modules (source-module-closure |
166 | '((gnu build file-systems))) | |
9b336338 LC |
167 | #~(let ((source #$(if (uuid? source) |
168 | (uuid-bytevector source) | |
169 | source))) | |
dfe06f6e LC |
170 | ;; XXX: 'use-modules' should be at the top level. |
171 | (use-modules (rnrs bytevectors) ;bytevector? | |
172 | ((gnu build file-systems) | |
173 | #:select (find-partition-by-luks-uuid))) | |
174 | ||
b7d408ec LC |
175 | ;; Use 'cryptsetup-static', not 'cryptsetup', to avoid pulling the |
176 | ;; whole world inside the initrd (for when we're in an initrd). | |
177 | (zero? (system* #$(file-append cryptsetup-static "/sbin/cryptsetup") | |
a91c3fc7 LC |
178 | "open" "--type" "luks" |
179 | ||
180 | ;; Note: We cannot use the "UUID=source" syntax here | |
181 | ;; because 'cryptsetup' implements it by searching the | |
182 | ;; udev-populated /dev/disk/by-id directory but udev may | |
183 | ;; be unavailable at the time we run this. | |
184 | (if (bytevector? source) | |
f45878a8 MW |
185 | (or (let loop ((tries-left 10)) |
186 | (and (positive? tries-left) | |
187 | (or (find-partition-by-luks-uuid source) | |
188 | ;; If the underlying partition is | |
189 | ;; not found, try again after | |
190 | ;; waiting a second, up to ten | |
191 | ;; times. FIXME: This should be | |
192 | ;; dealt with in a more robust way. | |
193 | (begin (sleep 1) | |
194 | (loop (- tries-left 1)))))) | |
a91c3fc7 LC |
195 | (error "LUKS partition not found" source)) |
196 | source) | |
197 | ||
198 | #$target))))) | |
374f14c2 LC |
199 | |
200 | (define (close-luks-device source target) | |
201 | "Return a gexp that closes TARGET, a LUKS device." | |
b7d408ec | 202 | #~(zero? (system* #$(file-append cryptsetup-static "/sbin/cryptsetup") |
374f14c2 LC |
203 | "close" #$target))) |
204 | ||
424cea80 LC |
205 | (define* (check-luks-device md #:key |
206 | needed-for-boot? | |
207 | (initrd-modules '()) | |
208 | #:allow-other-keys | |
209 | #:rest rest) | |
42ff7d3b | 210 | "Ensure the source of MD is valid." |
424cea80 LC |
211 | (let ((source (mapped-device-source md)) |
212 | (location (mapped-device-location md))) | |
213 | (or (not (zero? (getuid))) | |
214 | (if (uuid? source) | |
215 | (match (find-partition-by-luks-uuid (uuid-bytevector source)) | |
216 | (#f | |
217 | (raise (condition | |
218 | (&message | |
219 | (message (format #f (G_ "no LUKS partition with UUID '~a'") | |
220 | (uuid->string source)))) | |
221 | (&error-location | |
222 | (location (source-properties->location | |
223 | (mapped-device-location md))))))) | |
224 | ((? string? device) | |
225 | (check-device-initrd-modules device initrd-modules location))) | |
226 | (check-device-initrd-modules source initrd-modules location))))) | |
42ff7d3b | 227 | |
374f14c2 LC |
228 | (define luks-device-mapping |
229 | ;; The type of LUKS mapped devices. | |
230 | (mapped-device-kind | |
231 | (open open-luks-device) | |
42ff7d3b LC |
232 | (close close-luks-device) |
233 | (check check-luks-device))) | |
374f14c2 | 234 | |
7f8ad82b LC |
235 | (define (open-raid-device sources target) |
236 | "Return a gexp that assembles SOURCES (a list of devices) to the RAID device | |
237 | TARGET (e.g., \"/dev/md0\"), using 'mdadm'." | |
10618627 LC |
238 | #~(let ((sources '#$sources) |
239 | ||
240 | ;; XXX: We're not at the top level here. We could use a | |
241 | ;; non-top-level 'use-modules' form but that doesn't work when the | |
242 | ;; code is eval'd, like the Shepherd does. | |
243 | (every (@ (srfi srfi-1) every)) | |
244 | (format (@ (ice-9 format) format))) | |
245 | (let loop ((attempts 0)) | |
246 | (unless (every file-exists? sources) | |
247 | (when (> attempts 20) | |
248 | (error "RAID devices did not show up; bailing out" | |
249 | sources)) | |
250 | ||
251 | (format #t "waiting for RAID source devices~{ ~a~}...~%" | |
252 | sources) | |
253 | (sleep 1) | |
254 | (loop (+ 1 attempts)))) | |
255 | ||
4ed2f515 LC |
256 | ;; Use 'mdadm-static' rather than 'mdadm' to avoid pulling its whole |
257 | ;; closure (80 MiB) in the initrd when a RAID device is needed for boot. | |
258 | (zero? (apply system* #$(file-append mdadm-static "/sbin/mdadm") | |
6e52376d | 259 | "--assemble" #$target sources)))) |
7f8ad82b LC |
260 | |
261 | (define (close-raid-device sources target) | |
97c8aef1 | 262 | "Return a gexp that stops the RAID device TARGET." |
4ed2f515 | 263 | #~(zero? (system* #$(file-append mdadm-static "/sbin/mdadm") |
97c8aef1 AE |
264 | "--stop" #$target))) |
265 | ||
266 | (define raid-device-mapping | |
267 | ;; The type of RAID mapped devices. | |
268 | (mapped-device-kind | |
269 | (open open-raid-device) | |
270 | (close close-raid-device))) | |
271 | ||
060d62a7 | 272 | ;;; mapped-devices.scm ends here |