summary refs log tree commit diff
path: root/gnu/services/getmail.scm
blob: b3d86cb65c3dabac44c6070497332e7859f114e2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu services getmail)
  #:use-module (gnu services)
  #:use-module (gnu services base)
  #:use-module (gnu services configuration)
  #:use-module (gnu services shepherd)
  #:use-module (gnu system pam)
  #:use-module (gnu system shadow)
  #:use-module (gnu packages mail)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages tls)
  #:use-module (guix records)
  #:use-module (guix store)
  #:use-module (guix packages)
  #:use-module (guix gexp)
  #:use-module (ice-9 match)
  #:use-module (ice-9 format)
  #:use-module (srfi srfi-1)
  #:export (getmail-retriever-configuration
            getmail-retriever-configuration-extra-parameters
            getmail-destination-configuration
            getmail-options-configuration
            getmail-configuration-file
            getmail-configuration
            getmail-service-type))

;;; Commentary:
;;;
;;; Service for the getmail mail retriever.
;;;
;;; Code:

(define (uglify-field-name field-name)
  (let ((str (symbol->string field-name)))
    (string-join (string-split (if (string-suffix? "?" str)
                                   (substring str 0 (1- (string-length str)))
                                   str)
                               #\-)
                 "_")))

(define (serialize-field field-name val)
  #~(let ((val '#$val))
      (format #f "~a = ~a\n"
              #$(uglify-field-name field-name)
              (cond
               ((list? val)
                (string-append
                 "("
                 (string-concatenate
                  (map (lambda (list-val)
                         (format #f "\"~a\", " list-val))
                       val))
                 ")"))
               (else
                val)))))

(define (serialize-string field-name val)
  (if (string=? val "")
      ""
      (serialize-field field-name val)))

(define (string-or-filelike? val)
  (or (string? val)
      (file-like? val)))
(define (serialize-string-or-filelike field-name val)
  (if (equal? val "")
      ""
      (serialize-field field-name val)))

(define (serialize-boolean field-name val)
  (serialize-field field-name (if val "true" "false")))

(define (non-negative-integer? val)
  (and (exact-integer? val) (not (negative? val))))
(define (serialize-non-negative-integer field-name val)
  (serialize-field field-name val))

(define serialize-list serialize-field)

(define parameter-alist? list?)
(define (serialize-parameter-alist field-name val)
  #~(string-append
     #$@(map (match-lambda
               ((key . value)
                (serialize-field key value)))
             val)))

(define (serialize-getmail-retriever-configuration field-name val)
  (serialize-configuration val getmail-retriever-configuration-fields))

(define-configuration getmail-retriever-configuration
  (type
   (string "SimpleIMAPSSLRetriever")
   "The type of mail retriever to use.  Valid values include
@samp{passwd} and @samp{static}.")
  (server
   (string 'unset)
   "Space separated list of arguments to the userdb driver.")
  (username
   (string 'unset)
   "Space separated list of arguments to the userdb driver.")
  (port
   (non-negative-integer #f)
   "Space separated list of arguments to the userdb driver.")
  (password
   (string "")
   "Override fields from passwd.")
  (password-command
   (list '())
   "Override fields from passwd.")
  (keyfile
   (string "")
   "PEM-formatted key file to use for the TLS negotiation")
  (certfile
   (string "")
   "PEM-formatted certificate file to use for the TLS negotiation")
  (ca-certs
   (string "")
   "CA certificates to use")
  (extra-parameters
   (parameter-alist '())
   "Extra retriever parameters"))

(define (serialize-getmail-destination-configuration field-name val)
  (serialize-configuration val getmail-destination-configuration-fields))

(define-configuration getmail-destination-configuration
  (type
   (string 'unset)
   "The type of mail destination.  Valid values include @samp{Maildir},
@samp{Mboxrd} and @samp{MDA_external}.")
  (path
   (string-or-filelike "")
   "The path option for the mail destination.  The behaviour depends on the
chosen type.")
  (extra-parameters
   (parameter-alist '())
   "Extra destination parameters"))

(define (serialize-getmail-options-configuration field-name val)
  (serialize-configuration val getmail-options-configuration-fields))

(define-configuration getmail-options-configuration
  (verbose
   (non-negative-integer 1)
   "If set to @samp{0}, getmail will only print warnings and errors.  A value
of @samp{1} means that messages will be printed about retrieving and deleting
messages. If set to @samp{2}, getmail will print messages about each of it's
actions.")
  (read-all
   (boolean #t)
   "If true, getmail will retrieve all available messages.  Otherwise it will
only retrieve messages it hasn't seen previously.")
  (delete
   (boolean #f)
   "If set to true, messages will be deleted from the server after retrieving
and successfully delivering them.  Otherwise, messages will be left on the
server.")
  (delete-after
   (non-negative-integer 0)
   "Getmail will delete messages this number of days after seeing them, if
they have been delivered.  This means messages will be left on the server this
number of days after delivering them.  A value of @samp{0} disabled this
feature.")
  (delete-bigger-than
   (non-negative-integer 0)
   "Delete messages larger than this of bytes after retrieving them, even if
the delete and delete-after options are disabled.  A value of @samp{0}
disables this feature.")
  (max-bytes-per-session
   (non-negative-integer 0)
   "Retrieve messages totalling up to this number of bytes before closing the
session with the server.  A value of @samp{0} disables this feature.")
  (max-message-size
   (non-negative-integer 0)
   "Don't retrieve messages larger than this number of bytes.  A value of
@samp{0} disables this feature.")
  (delivered-to
   (boolean #t)
   "If true, getmail will add a Delivered-To header to messages.")
  (received
   (boolean #t)
   "If set, getmail adds a Received header to the messages.")
  (message-log
   (string "")
   "Getmail will record a log of its actions to the named file.  A value of
@samp{\"\"} disables this feature.")
  (message-log-syslog
   (boolean #t)
   "If true, getmail will record a log of its actions using the system
logger.")
  (message-log-verbose
   (boolean #t)
   "If true, getmail will log information about messages not retrieved and the
reason for not retrieving them, as well as starting and ending information
lines.")
  (extra-parameters
   (parameter-alist '())
   "Extra options to include."))

(define (serialize-getmail-configuration-file field-name val)
  (match val
    (($ <getmail-configuration-file> location
                                     retriever destination options)
     #~(string-append
        "[retriever]\n"
        #$(serialize-getmail-retriever-configuration #f retriever)
        "\n[destination]\n"
        #$(serialize-getmail-destination-configuration #f destination)
        "\n[options]\n"
        #$(serialize-getmail-options-configuration #f options)))))

(define-configuration getmail-configuration-file
  (retriever
   (getmail-retriever-configuration (getmail-retriever-configuration))
   "What mail account to retrieve mail from, and how to access that account.")
  (destination
   (getmail-destination-configuration (getmail-destination-configuration))
   "What to do with retrieved messages.")
  (options
   (getmail-options-configuration (getmail-options-configuration))
   "Configure getmail."))

(define (serialize-symbol field-name val) "")
(define (serialize-getmail-configuration field-name val) "")

(define-configuration getmail-configuration
  (name
   (symbol "unset")
   "A symbol to identify the getmail service.")
  (package
   (package getmail)
   "The getmail package to use.")
  (user
   (string "getmail")
   "The user to run getmail as.")
  (group
   (string "getmail")
   "The group to run getmail as.")
  (directory
   (string "/var/lib/getmail/default")
   "The getmail directory to use.")
  (rcfile
   (getmail-configuration-file (getmail-configuration-file))
   "The getmail configuration file to use.")
  (idle
   (list '())
   "A list of mailboxes that getmail should wait on the server for new mail
notifications.  This depends on the server supporting the IDLE extension.")
  (environment-variables
   (list '())
   "Environment variables to set for getmail."))

(define (generate-getmail-documentation)
  (generate-documentation
   `((getmail-configuration
      ,getmail-configuration-fields
      (rcfile getmail-configuration-file))
     (getmail-configuration-file
      ,getmail-configuration-file-fields
      (retriever getmail-retriever-configuration)
      (destination getmail-destination-configuration)
      (options getmail-options-configuration))
     (getmail-retriever-configuration ,getmail-retriever-configuration-fields)
     (getmail-destination-configuration ,getmail-destination-configuration-fields)
     (getmail-options-configuration ,getmail-options-configuration-fields))
   'getmail-configuration))

(define-gexp-compiler (getmail-configuration-file-compiler
                       (rcfile <getmail-configuration-file>) system target)
  (gexp->derivation
   "getmailrc"
   #~(call-with-output-file #$output
       (lambda (port)
         (display #$(serialize-getmail-configuration-file #f rcfile)
                  port)))
   #:system system
   #:target target))

(define (getmail-accounts configs)
  (let ((users (delete-duplicates
                (map getmail-configuration-user
                     configs)))
        (groups (delete-duplicates
                 (map getmail-configuration-group
                      configs))))
    (append
     (map (lambda (group)
            (user-group
             (name group)
             (system? #t)))
          groups)
     (map (lambda (user)
            (user-account
             (name user)
             (group (getmail-configuration-group
                     (find (lambda (config)
                             (and
                              (string=? user (getmail-configuration-user config))
                              (getmail-configuration-group config)))
                           configs)))
             (system? #t)
             (comment "Getmail user")
             (home-directory "/var/empty")
             (shell (file-append shadow "/sbin/nologin"))))
          users))))

(define (getmail-activation configs)
  "Return the activation GEXP for CONFIGS."
  (with-imported-modules '((guix build utils))
    #~(begin
        (use-modules (guix build utils))
        #$@(map
            (lambda (config)
              #~(let* ((pw (getpw #$(getmail-configuration-user config)))
                       (uid (passwd:uid pw))
                       (gid (passwd:gid pw))
                       (getmaildir #$(getmail-configuration-directory config)))
                  (mkdir-p getmaildir)
                  (chown getmaildir uid gid)))
            configs))))

(define (getmail-shepherd-services configs)
  "Return a list of <shepherd-service> for CONFIGS."
  (map (match-lambda
         (($ <getmail-configuration> location name package
                                     user group directory rcfile idle
                                     environment-variables)
          (shepherd-service
           (documentation "Run getmail.")
           (provision (list (symbol-append 'getmail- name)))
           (requirement '(networking))
           (start #~(make-forkexec-constructor
                     `(#$(file-append package "/bin/getmail")
                       ,(string-append "--getmaildir=" #$directory)
                       #$@(map (lambda (idle)
                                 (string-append "--idle=" idle))
                               idle)
                       ,(string-append "--rcfile=" #$rcfile))
                     #:user #$user
                     #:group #$group
                     #:environment-variables
                     (list #$@environment-variables)
                     #:log-file
                     #$(string-append "/var/log/getmail-"
                                      (symbol->string name)))))))
       configs))

(define getmail-service-type
  (service-type
   (name 'getmail)
   (extensions
    (list (service-extension shepherd-root-service-type
                             getmail-shepherd-services)
          (service-extension activation-service-type
                             getmail-activation)
          (service-extension account-service-type
                             getmail-accounts)))
   (description
    "Run @command{getmail}, a mail retriever program.")
   (default-value '())
   (compose concatenate)
   (extend append)))