diff options
Diffstat (limited to 'gnu/services')
| -rw-r--r-- | gnu/services/configuration.scm | 3 | ||||
| -rw-r--r-- | gnu/services/messaging.scm | 726 |
2 files changed, 729 insertions, 0 deletions
diff --git a/gnu/services/configuration.scm b/gnu/services/configuration.scm index 94c5f21557..a98db64fa5 100644 --- a/gnu/services/configuration.scm +++ b/gnu/services/configuration.scm @@ -28,10 +28,13 @@ #:use-module (srfi srfi-35) #:export (configuration-field configuration-field-name + configuration-field-type configuration-missing-field configuration-field-error configuration-field-serializer configuration-field-getter + configuration-field-default-value-thunk + configuration-field-documentation serialize-configuration define-configuration validate-configuration diff --git a/gnu/services/messaging.scm b/gnu/services/messaging.scm new file mode 100644 index 0000000000..0b5aa1fae8 --- /dev/null +++ b/gnu/services/messaging.scm @@ -0,0 +1,726 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2017 Clément Lassieur <clement@lassieur.org> +;;; +;;; 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 messaging) + #:use-module (gnu packages messaging) + #:use-module (gnu packages admin) + #:use-module (gnu services) + #:use-module (gnu services shepherd) + #:use-module (gnu services configuration) + #:use-module (gnu system shadow) + #:use-module (guix gexp) + #:use-module (guix records) + #:use-module (guix packages) + #:use-module (srfi srfi-1) + #:use-module (srfi srfi-35) + #:use-module (ice-9 match) + #:export (prosody-service-type + prosody-configuration + opaque-prosody-configuration + + virtualhost-configuration + int-component-configuration + ext-component-configuration + + mod-muc-configuration + ssl-configuration + + %default-modules-enabled)) + +;;; Commentary: +;;; +;;; Messaging services. +;;; +;;; Code: + +(define (id ctx . parts) + (datum->syntax ctx (apply symbol-append (map syntax->datum parts)))) + +(define-syntax define-maybe + (lambda (x) + (syntax-case x () + ((_ stem) + (with-syntax + ((stem? (id #'stem #'stem #'?)) + (maybe-stem? (id #'stem #'maybe- #'stem #'?)) + (serialize-stem (id #'stem #'serialize- #'stem)) + (serialize-maybe-stem (id #'stem #'serialize-maybe- #'stem))) + #'(begin + (define (maybe-stem? val) + (or (eq? val 'disabled) (stem? val))) + (define (serialize-maybe-stem field-name val) + (when (stem? val) (serialize-stem field-name val))))))))) + +(define-syntax define-all-configurations + (lambda (stx) + (define (make-pred arg) + (lambda (field target) + (and (memq (syntax->datum target) `(common ,arg)) field))) + (syntax-case stx () + ((_ stem (field (field-type def) doc target) ...) + (with-syntax (((new-field-type ...) + (map (lambda (field-type target) + (if (and (eq? 'common (syntax->datum target)) + (not (string-prefix? + "maybe-" + (symbol->string + (syntax->datum field-type))))) + (id #'stem #'maybe- field-type) field-type)) + #'(field-type ...) #'(target ...))) + ((new-def ...) + (map (lambda (def target) + (if (eq? 'common (syntax->datum target)) + #''disabled def)) + #'(def ...) #'(target ...))) + ((new-doc ...) + (map (lambda (doc target) + (if (eq? 'common (syntax->datum target)) + "" doc)) + #'(doc ...) #'(target ...)))) + #`(begin + (define common-fields + '(#,@(filter-map (make-pred #f) #'(field ...) #'(target ...)))) + (define-configuration prosody-configuration + #,@(filter-map (make-pred 'global) + #'((field (field-type def) doc) ...) + #'(target ...))) + (define-configuration virtualhost-configuration + #,@(filter-map (make-pred 'virtualhost) + #'((field (new-field-type new-def) new-doc) ...) + #'(target ...))) + (define-configuration int-component-configuration + #,@(filter-map (make-pred 'int-component) + #'((field (new-field-type new-def) new-doc) ...) + #'(target ...))) + (define-configuration ext-component-configuration + #,@(filter-map (make-pred 'ext-component) + #'((field (new-field-type new-def) new-doc) ...) + #'(target ...))))))))) + +(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) + (format #t "~a = ~a;\n" (uglify-field-name field-name) val)) +(define (serialize-field-list field-name val) + (serialize-field field-name + (with-output-to-string + (lambda () + (format #t "{\n") + (for-each (lambda (x) + (format #t "~a;\n" x)) + val) + (format #t "}"))))) + +(define (serialize-boolean field-name val) + (serialize-field field-name (if val "true" "false"))) +(define-maybe boolean) + +(define (string-or-boolean? val) + (or (string? val) (boolean? val))) +(define (serialize-string-or-boolean field-name val) + (if (string? val) + (serialize-string field-name val) + (serialize-boolean field-name val))) + +(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-maybe non-negative-integer) + +(define (non-negative-integer-list? val) + (and (list? val) (and-map non-negative-integer? val))) +(define (serialize-non-negative-integer-list field-name val) + (serialize-field-list field-name val)) +(define-maybe non-negative-integer-list) + +(define (enclose-quotes s) + (format #f "\"~a\"" s)) +(define (serialize-string field-name val) + (serialize-field field-name (enclose-quotes val))) +(define-maybe string) + +(define (string-list? val) + (and (list? val) + (and-map (lambda (x) + (and (string? x) (not (string-index x #\,)))) + val))) +(define (serialize-string-list field-name val) + (serialize-field-list field-name (map enclose-quotes val))) +(define-maybe string-list) + +(define (module-list? val) + (string-list? val)) +(define (serialize-module-list field-name val) + (serialize-string-list field-name (cons "posix" val))) +(define-maybe module-list) + +(define (file-name? val) + (and (string? val) + (string-prefix? "/" val))) +(define (serialize-file-name field-name val) + (serialize-string field-name val)) +(define-maybe file-name) + +(define (file-name-list? val) + (and (list? val) (and-map file-name? val))) +(define (serialize-file-name-list field-name val) + (serialize-string-list field-name val)) +(define-maybe file-name) + +(define-configuration mod-muc-configuration + (name + (string "Prosody Chatrooms") + "The name to return in service discovery responses.") + + (restrict-room-creation + (string-or-boolean #f) + "If @samp{#t}, this will only allow admins to create new chatrooms. +Otherwise anyone can create a room. The value @samp{\"local\"} restricts room +creation to users on the service's parent domain. E.g. @samp{user@@example.com} +can create rooms on @samp{rooms.example.com}. The value @samp{\"admin\"} +restricts to service administrators only.") + + (max-history-messages + (non-negative-integer 20) + "Maximum number of history messages that will be sent to the member that has +just joined the room.")) +(define (serialize-mod-muc-configuration field-name val) + (serialize-configuration val mod-muc-configuration-fields)) +(define-maybe mod-muc-configuration) + +(define-configuration ssl-configuration + (protocol + (maybe-string 'disabled) + "This determines what handshake to use.") + + (key + (file-name "/etc/prosody/certs/key.pem") + "Path to your private key file, relative to @code{/etc/prosody}.") + + (certificate + (file-name "/etc/prosody/certs/cert.pem") + "Path to your certificate file, relative to @code{/etc/prosody}.") + + (capath + (file-name "/etc/ssl/certs") + "Path to directory containing root certificates that you wish Prosody to +trust when verifying the certificates of remote servers.") + + (cafile + (maybe-file-name 'disabled) + "Path to a file containing root certificates that you wish Prosody to trust. +Similar to @code{capath} but with all certificates concatenated together.") + + (verify + (maybe-string-list 'disabled) + "A list of verification options (these mostly map to OpenSSL's +@code{set_verify()} flags).") + + (options + (maybe-string-list 'disabled) + "A list of general options relating to SSL/TLS. These map to OpenSSL's +@code{set_options()}. For a full list of options available in LuaSec, see the +LuaSec source.") + + (depth + (maybe-non-negative-integer 'disabled) + "How long a chain of certificate authorities to check when looking for a +trusted root certificate.") + + (ciphers + (maybe-string 'disabled) + "An OpenSSL cipher string. This selects what ciphers Prosody will offer to +clients, and in what order.") + + (dhparam + (maybe-file-name 'disabled) + "A path to a file containing parameters for Diffie-Hellman key exchange. You +can create such a file with: +@code{openssl dhparam -out /etc/prosody/certs/dh-2048.pem 2048}") + + (curve + (maybe-string 'disabled) + "Curve for Elliptic curve Diffie-Hellman. Prosody's default is +@samp{\"secp384r1\"}.") + + (verifyext + (maybe-string-list 'disabled) + "A list of \"extra\" verification options.") + + (password + (maybe-string 'disabled) + "Password for encrypted private keys.")) +(define (serialize-ssl-configuration field-name val) + (format #t "ssl = {\n") + (serialize-configuration val ssl-configuration-fields) + (format #t "};\n")) +(define-maybe ssl-configuration) + +(define %default-modules-enabled + '("roster" + "saslauth" + "tls" + "dialback" + "disco" + "private" + "vcard" + "version" + "uptime" + "time" + "ping" + "pep" + "register" + "admin_adhoc")) + +;; Guile bug. Use begin wrapper, because otherwise virtualhost-configuration +;; is assumed to be a function. See +;; https://www.gnu.org/software/guile/manual/html_node/R6RS-Incompatibilities.html +(begin + (define (virtualhost-configuration-list? val) + (and (list? val) (and-map virtualhost-configuration? val))) + (define (serialize-virtualhost-configuration-list l) + (for-each + (lambda (val) (serialize-virtualhost-configuration val)) l)) + + (define (int-component-configuration-list? val) + (and (list? val) (and-map int-component-configuration? val))) + (define (serialize-int-component-configuration-list l) + (for-each + (lambda (val) (serialize-int-component-configuration val)) l)) + + (define (ext-component-configuration-list? val) + (and (list? val) (and-map ext-component-configuration? val))) + (define (serialize-ext-component-configuration-list l) + (for-each + (lambda (val) (serialize-ext-component-configuration val)) l)) + + (define-all-configurations prosody-configuration + (prosody + (package prosody) + "The Prosody package." + global) + + (data-path + (file-name "/var/lib/prosody") + "Location of the Prosody data storage directory. See +@url{http://prosody.im/doc/configure}." + global) + + (plugin-paths + (file-name-list '()) + "Additional plugin directories. They are searched in all the specified +paths in order. See @url{http://prosody.im/doc/plugins_directory}." + global) + + (admins + (string-list '()) + "This is a list of accounts that are admins for the server. Note that you +must create the accounts separately. See @url{http://prosody.im/doc/admins} and +@url{http://prosody.im/doc/creating_accounts}. +Example: @code{(admins '(\"user1@@example.com\" \"user2@@example.net\"))}" + common) + + (use-libevent? + (boolean #f) + "Enable use of libevent for better performance under high load. See +@url{http://prosody.im/doc/libevent}." + common) + + (modules-enabled + (module-list %default-modules-enabled) + "This is the list of modules Prosody will load on startup. It looks for +@code{mod_modulename.lua} in the plugins folder, so make sure that exists too. +Documentation on modules can be found at: @url{http://prosody.im/doc/modules}. +Defaults to @samp{%default-modules-enabled}." + common) + + (modules-disabled + (string-list '()) + "@samp{\"offline\"}, @samp{\"c2s\"} and @samp{\"s2s\"} are auto-loaded, but +should you want to disable them then add them to this list." + common) + + (groups-file + (file-name "/var/lib/prosody/sharedgroups.txt") + "Path to a text file where the shared groups are defined. If this path is +empty then @samp{mod_groups} does nothing. See +@url{http://prosody.im/doc/modules/mod_groups}." + common) + + (allow-registration? + (boolean #f) + "Disable account creation by default, for security. See +@url{http://prosody.im/doc/creating_accounts}." + common) + + (ssl + (maybe-ssl-configuration (ssl-configuration)) + "These are the SSL/TLS-related settings. Most of them are disabled so to +use Prosody's defaults. If you do not completely understand these options, do +not add them to your config, it is easy to lower the security of your server +using them. See @url{http://prosody.im/doc/advanced_ssl_config}." + common) + + (c2s-require-encryption? + (boolean #f) + "Whether to force all client-to-server connections to be encrypted or not. +See @url{http://prosody.im/doc/modules/mod_tls}." + common) + + (s2s-require-encryption? + (boolean #f) + "Whether to force all server-to-server connections to be encrypted or not. +See @url{http://prosody.im/doc/modules/mod_tls}." + common) + + (s2s-secure-auth? + (boolean #f) + "Whether to require encryption and certificate authentication. This +provides ideal security, but requires servers you communicate with to support +encryption AND present valid, trusted certificates. See +@url{http://prosody.im/doc/s2s#security}." + common) + + (s2s-insecure-domains + (string-list '()) + "Many servers don't support encryption or have invalid or self-signed +certificates. You can list domains here that will not be required to +authenticate using certificates. They will be authenticated using DNS. See +@url{http://prosody.im/doc/s2s#security}." + common) + + (s2s-secure-domains + (string-list '()) + "Even if you leave @code{s2s-secure-auth?} disabled, you can still require +valid certificates for some domains by specifying a list here. See +@url{http://prosody.im/doc/s2s#security}." + common) + + (authentication + (string "internal_plain") + "Select the authentication backend to use. The default provider stores +passwords in plaintext and uses Prosody's configured data storage to store the +authentication data. If you do not trust your server please see +@url{http://prosody.im/doc/modules/mod_auth_internal_hashed} for information +about using the hashed backend. See also +@url{http://prosody.im/doc/authentication}" + common) + + ;; TODO: Handle more complicated log structures. + (log + (maybe-string "*syslog") + "Set logging options. Advanced logging configuration is not yet supported +by the GuixSD Prosody Service. See @url{http://prosody.im/doc/logging}." + common) + + (pidfile + (file-name "/var/run/prosody/prosody.pid") + "File to write pid in. See @url{http://prosody.im/doc/modules/mod_posix}." + global) + + (virtualhosts + (virtualhost-configuration-list + (list (virtualhost-configuration + (domain "localhost")))) + "A host in Prosody is a domain on which user accounts can be created. For +example if you want your users to have addresses like +@samp{\"john.smith@@example.com\"} then you need to add a host +@samp{\"example.com\"}. All options in this list will apply only to this host. + +Note: the name \"virtual\" host is used in configuration to avoid confusion with +the actual physical host that Prosody is installed on. A single Prosody +instance can serve many domains, each one defined as a VirtualHost entry in +Prosody's configuration. Conversely a server that hosts a single domain would +have just one VirtualHost entry. + +See @url{http://prosody.im/doc/configure#virtual_host_settings}." + global) + + (int-components + (int-component-configuration-list '()) + "Components are extra services on a server which are available to clients, +usually on a subdomain of the main server (such as +@samp{\"mycomponent.example.com\"}). Example components might be chatroom +servers, user directories, or gateways to other protocols. + +Internal components are implemented with Prosody-specific plugins. To add an +internal component, you simply fill the hostname field, and the plugin you wish +to use for the component. + +See @url{http://prosody.im/doc/components}." + global) + + (ext-components + (ext-component-configuration-list '()) + "External components use XEP-0114, which most standalone components +support. To add an external component, you simply fill the hostname field. See +@url{http://prosody.im/doc/components}." + global) + + (component-secret + (string (configuration-missing-field 'ext-component 'component-secret)) + "Password which the component will use to log in." + ext-component) + + (component-ports + (non-negative-integer-list '(5347)) + "Port(s) Prosody listens on for component connections." + global) + + (component-interface + (string "127.0.0.1") + "Interface Prosody listens on for component connections." + global) + + (domain + (string (configuration-missing-field 'virtualhost 'domain)) + "Domain you wish Prosody to serve." + virtualhost) + + (hostname + (string (configuration-missing-field 'int-component 'hostname)) + "Hostname of the component." + int-component) + + (plugin + (string (configuration-missing-field 'int-component 'plugin)) + "Plugin you wish to use for the component." + int-component) + + (mod-muc + (maybe-mod-muc-configuration 'disabled) + "Multi-user chat (MUC) is Prosody's module for allowing you to create +hosted chatrooms/conferences for XMPP users. + +General information on setting up and using multi-user chatrooms can be found +in the \"Chatrooms\" documentation (@url{http://prosody.im/doc/chatrooms}), +which you should read if you are new to XMPP chatrooms. + +See also @url{http://prosody.im/doc/modules/mod_muc}." + int-component) + + (hostname + (string (configuration-missing-field 'ext-component 'hostname)) + "Hostname of the component." + ext-component))) + +;; Serialize Virtualhost line first. +(define (serialize-virtualhost-configuration config) + (define (rest? field) + (not (memq (configuration-field-name field) + '(domain)))) + (let ((domain (virtualhost-configuration-domain config)) + (rest (filter rest? virtualhost-configuration-fields))) + (format #t "VirtualHost \"~a\"\n" domain) + (serialize-configuration config rest))) + +;; Serialize Component line first. +(define (serialize-int-component-configuration config) + (define (rest? field) + (not (memq (configuration-field-name field) + '(hostname plugin)))) + (let ((hostname (int-component-configuration-hostname config)) + (plugin (int-component-configuration-plugin config)) + (rest (filter rest? int-component-configuration-fields))) + (format #t "Component \"~a\" \"~a\"\n" hostname plugin) + (serialize-configuration config rest))) + +;; Serialize Component line first. +(define (serialize-ext-component-configuration config) + (define (rest? field) + (not (memq (configuration-field-name field) + '(hostname)))) + (let ((hostname (ext-component-configuration-hostname config)) + (rest (filter rest? ext-component-configuration-fields))) + (format #t "Component \"~a\"\n" hostname) + (serialize-configuration config rest))) + +;; Serialize virtualhosts and components last. +(define (serialize-prosody-configuration config) + (define (rest? field) + (not (memq (configuration-field-name field) + '(virtualhosts int-components ext-components)))) + (let ((rest (filter rest? prosody-configuration-fields))) + (serialize-configuration config rest)) + (serialize-virtualhost-configuration-list + (prosody-configuration-virtualhosts config)) + (serialize-int-component-configuration-list + (prosody-configuration-int-components config)) + (serialize-ext-component-configuration-list + (prosody-configuration-ext-components config))) + +(define-configuration opaque-prosody-configuration + (prosody + (package prosody) + "The prosody package.") + + (prosody.cfg.lua + (string (configuration-missing-field 'opaque-prosody-configuration + 'prosody.cfg.lua)) + "The contents of the @code{prosody.cfg.lua} to use.")) + +(define (prosody-shepherd-service config) + "Return a <shepherd-service> for Prosody with CONFIG." + (let* ((prosody (if (opaque-prosody-configuration? config) + (opaque-prosody-configuration-prosody config) + (prosody-configuration-prosody config))) + (prosodyctl-bin (file-append prosody "/bin/prosodyctl")) + (prosodyctl-action (lambda args + #~(lambda _ + (zero? (system* #$prosodyctl-bin #$@args)))))) + (list (shepherd-service + (documentation "Run the Prosody XMPP server") + (provision '(prosody)) + (requirement '(networking syslogd user-processes)) + (start (prosodyctl-action "start")) + (stop (prosodyctl-action "stop")))))) + +(define %prosody-accounts + (list (user-group (name "prosody") (system? #t)) + (user-account + (name "prosody") + (group "prosody") + (system? #t) + (comment "Prosody daemon user") + (home-directory "/var/empty") + (shell (file-append shadow "/sbin/nologin"))))) + +(define (prosody-activation config) + "Return the activation gexp for CONFIG." + (let* ((config-dir "/etc/prosody") + (default-certs-dir "/etc/prosody/certs") + (data-path (prosody-configuration-data-path config)) + (pidfile-dir (dirname (prosody-configuration-pidfile config))) + (config-str + (if (opaque-prosody-configuration? config) + (opaque-prosody-configuration-prosody.cfg.lua config) + (with-output-to-string + (lambda () + (serialize-prosody-configuration config))))) + (config-file (plain-file "prosody.cfg.lua" config-str))) + #~(begin + (define %user (getpw "prosody")) + + (mkdir-p #$config-dir) + (chown #$config-dir (passwd:uid %user) (passwd:gid %user)) + (copy-file #$config-file (string-append #$config-dir + "/prosody.cfg.lua")) + + (mkdir-p #$default-certs-dir) + (chown #$default-certs-dir (passwd:uid %user) (passwd:gid %user)) + (chmod #$default-certs-dir #o750) + + (mkdir-p #$data-path) + (chown #$data-path (passwd:uid %user) (passwd:gid %user)) + (chmod #$data-path #o750) + + (mkdir-p #$pidfile-dir) + (chown #$pidfile-dir (passwd:uid %user) (passwd:gid %user))))) + +(define prosody-service-type + (service-type (name 'prosody) + (extensions + (list (service-extension shepherd-root-service-type + prosody-shepherd-service) + (service-extension account-service-type + (const %prosody-accounts)) + (service-extension activation-service-type + prosody-activation))))) + +;; A little helper to make it easier to document all those fields. +(define (generate-documentation) + (define documentation + `((prosody-configuration + ,prosody-configuration-fields + (ssl ssl-configuration) + (virtualhosts virtualhost-configuration) + (int-components int-component-configuration) + (ext-components ext-component-configuration)) + (ssl-configuration ,ssl-configuration-fields) + (int-component-configuration ,int-component-configuration-fields + (mod-muc mod-muc-configuration)) + (ext-component-configuration ,ext-component-configuration-fields) + (mod-muc-configuration ,mod-muc-configuration-fields) + (virtualhost-configuration ,virtualhost-configuration-fields) + (opaque-prosody-configuration ,opaque-prosody-configuration-fields))) + (define (generate configuration-name) + (match (assq-ref documentation configuration-name) + ((fields . sub-documentation) + (format #t "\nAvailable @code{~a} fields are:\n\n" configuration-name) + (when (memq configuration-name + '(virtualhost-configuration + int-component-configuration + ext-component-configuration)) + (format #t "all these @code{prosody-configuration} fields: ~a, plus:\n" + (string-join (map (lambda (s) + (format #f "@code{~a}" s)) common-fields) + ", "))) + (for-each + (lambda (f) + (let ((field-name (configuration-field-name f)) + (field-type (configuration-field-type f)) + (field-docs (string-trim-both + (configuration-field-documentation f))) + (default (catch #t + (configuration-field-default-value-thunk f) + (lambda _ 'nope)))) + (define (escape-chars str chars escape) + (with-output-to-string + (lambda () + (string-for-each (lambda (c) + (when (char-set-contains? chars c) + (display escape)) + (display c)) + str)))) + (define (show-default? val) + (or (string? default) (number? default) (boolean? default) + (and (list? val) (and-map show-default? val)))) + (format #t "@deftypevr {@code{~a} parameter} ~a ~a\n~a\n" + configuration-name field-type field-name field-docs) + (when (show-default? default) + (format #t "Defaults to @samp{~a}.\n" + (escape-chars (format #f "~s" default) + (char-set #\@ #\{ #\}) + #\@))) + (for-each generate (or (assq-ref sub-documentation field-name) '())) + (format #t "@end deftypevr\n\n"))) + (filter (lambda (f) + (not (string=? "" (configuration-field-documentation f)))) + fields))))) + (generate 'prosody-configuration) + (format #t "It could be that you just want to get a @code{prosody.cfg.lua} +up and running. In that case, you can pass an +@code{opaque-prosody-configuration} record as the value of +@code{prosody-service-type}. As its name indicates, an opaque configuration +does not have easy reflective capabilities.") + (generate 'opaque-prosody-configuration) + (format #t "For example, if your @code{prosody.cfg.lua} is just the empty +string, you could instantiate a prosody service like this: + +@example +(service prosody-service-type + (opaque-prosody-configuration + (prosody.cfg.lua \"\"))) +@end example")) |