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+;;; 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"))