00a28bc435
* gnu/services/configuration.scm (list-of-packages?, list-of-symbols?): New predicate. * gnu/services/audio.scm (list-of-symbol?): Remove. * gnu/services/telephony.scm (string-list?): Remove. (serialize-string-list): Rename to … (serialize-list-of-strings): … this. (account-fingerprint-list?, jami-account-list?): Use list-of. * doc/guix.texi: Update it. Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
569 lines
22 KiB
Scheme
569 lines
22 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
|
||
;;; Copyright © 2015 Andy Wingo <wingo@igalia.com>
|
||
;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
|
||
;;; Copyright © 2017, 2018 Clément Lassieur <clement@lassieur.org>
|
||
;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz>
|
||
;;; Copyright © 2021, 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
|
||
;;; Copyright © 2021 Andrew Tropin <andrew@trop.in>
|
||
;;; Copyright © 2022 Maxime Devos <maximedevos@telenet.be>
|
||
;;; Copyright © 2023 Bruno Victal <mirai@makinata.eu>
|
||
;;;
|
||
;;; 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 configuration)
|
||
#:use-module (guix packages)
|
||
#:use-module (guix records)
|
||
#:use-module (guix gexp)
|
||
#:use-module ((guix utils) #:select (source-properties->location))
|
||
#:use-module ((guix diagnostics)
|
||
#:select (formatted-message location-file &error-location
|
||
warning))
|
||
#:use-module ((guix modules) #:select (file-name->module-name))
|
||
#:use-module (guix i18n)
|
||
#:autoload (texinfo) (texi-fragment->stexi)
|
||
#:autoload (texinfo serialize) (stexi->texi)
|
||
#:use-module (ice-9 curried-definitions)
|
||
#:use-module (ice-9 format)
|
||
#:use-module (ice-9 match)
|
||
#:use-module (srfi srfi-1)
|
||
#:use-module (srfi srfi-26)
|
||
#:use-module (srfi srfi-34)
|
||
#:use-module (srfi srfi-35)
|
||
#:use-module (srfi srfi-171)
|
||
#:export (configuration-field
|
||
configuration-field-name
|
||
configuration-field-type
|
||
configuration-missing-field
|
||
configuration-field-error
|
||
configuration-field-sanitizer
|
||
configuration-field-serializer
|
||
configuration-field-getter
|
||
configuration-field-default-value-thunk
|
||
configuration-field-documentation
|
||
|
||
configuration-error?
|
||
|
||
define-configuration
|
||
define-configuration/no-serialization
|
||
no-serialization
|
||
|
||
empty-serializer?
|
||
tfilter-maybe-value
|
||
base-transducer
|
||
|
||
serialize-configuration
|
||
define-maybe
|
||
define-maybe/no-serialization
|
||
%unset-value
|
||
maybe-value
|
||
maybe-value-set?
|
||
generate-documentation
|
||
configuration->documentation
|
||
empty-serializer
|
||
serialize-package
|
||
|
||
filter-configuration-fields
|
||
|
||
interpose
|
||
list-of
|
||
|
||
list-of-packages?
|
||
list-of-strings?
|
||
list-of-symbols?
|
||
alist?
|
||
serialize-file-like
|
||
text-config?
|
||
serialize-text-config
|
||
generic-serialize-alist-entry
|
||
generic-serialize-alist))
|
||
|
||
;;; Commentary:
|
||
;;;
|
||
;;; Syntax for creating Scheme bindings to complex configuration files.
|
||
;;;
|
||
;;; Code:
|
||
|
||
(define-condition-type &configuration-error &error
|
||
configuration-error?)
|
||
|
||
(define (configuration-error message)
|
||
(raise (condition (&message (message message))
|
||
(&configuration-error))))
|
||
(define (configuration-field-error loc field value)
|
||
(raise (apply
|
||
make-compound-condition
|
||
(formatted-message (G_ "invalid value ~s for field '~a'")
|
||
value field)
|
||
(condition (&configuration-error))
|
||
(if loc
|
||
(list (condition
|
||
(&error-location (location loc))))
|
||
'()))))
|
||
|
||
(define (configuration-missing-field kind field)
|
||
(configuration-error
|
||
(format #f "~a configuration missing required field ~a" kind field)))
|
||
(define (configuration-missing-default-value kind field)
|
||
(configuration-error
|
||
(format #f "The field `~a' of the `~a' configuration record \
|
||
does not have a default value" field kind)))
|
||
|
||
(define-record-type* <configuration-field>
|
||
configuration-field make-configuration-field configuration-field?
|
||
(name configuration-field-name)
|
||
(type configuration-field-type)
|
||
(getter configuration-field-getter)
|
||
(predicate configuration-field-predicate)
|
||
(sanitizer configuration-field-sanitizer)
|
||
(serializer configuration-field-serializer)
|
||
(default-value-thunk configuration-field-default-value-thunk)
|
||
(documentation configuration-field-documentation))
|
||
|
||
(define (empty-serializer? field)
|
||
"Predicate that checks whether FIELD is exempt from serialization."
|
||
(eq? empty-serializer
|
||
(configuration-field-serializer field)))
|
||
|
||
(define (tfilter-maybe-value config)
|
||
"Return a transducer for CONFIG that removes all maybe-type fields whose
|
||
value is '%unset-marker."
|
||
(tfilter (lambda (field)
|
||
(let ((field-value ((configuration-field-getter field) config)))
|
||
(maybe-value-set? field-value)))))
|
||
|
||
(define (base-transducer config)
|
||
"Return a transducer for CONFIG that calls the serializing procedures only
|
||
for fields marked for serialization and whose values are not '%unset-marker."
|
||
(compose (tremove empty-serializer?)
|
||
;; Only serialize fields whose value isn't '%unset-marker%.
|
||
(tfilter-maybe-value config)
|
||
(tmap (lambda (field)
|
||
((configuration-field-serializer field)
|
||
(configuration-field-name field)
|
||
((configuration-field-getter field) config))))))
|
||
|
||
(define (serialize-configuration config fields)
|
||
"Return a G-expression that contains the values corresponding to the
|
||
FIELDS of CONFIG, a record that has been generated by `define-configuration'.
|
||
The G-expression can then be serialized to disk by using something like
|
||
`mixed-text-file'."
|
||
#~(string-append
|
||
#$@(list-transduce (base-transducer config) rcons fields)))
|
||
|
||
(define-syntax-rule (id ctx parts ...)
|
||
"Assemble PARTS into a raw (unhygienic) identifier."
|
||
(datum->syntax ctx (symbol-append (syntax->datum parts) ...)))
|
||
|
||
(define (define-maybe-helper serialize? prefix syn)
|
||
(syntax-case syn ()
|
||
((_ stem)
|
||
(with-syntax
|
||
((stem? (id #'stem #'stem #'?))
|
||
(maybe-stem? (id #'stem #'maybe- #'stem #'?))
|
||
(serialize-stem (if prefix
|
||
(id #'stem prefix #'serialize- #'stem)
|
||
(id #'stem #'serialize- #'stem)))
|
||
(serialize-maybe-stem (if prefix
|
||
(id #'stem prefix #'serialize-maybe- #'stem)
|
||
(id #'stem #'serialize-maybe- #'stem))))
|
||
#`(begin
|
||
(define (maybe-stem? val)
|
||
(or (not (maybe-value-set? val))
|
||
(stem? val)))
|
||
#,@(if serialize?
|
||
(list #'(define (serialize-maybe-stem field-name val)
|
||
(if (stem? val)
|
||
(serialize-stem field-name val)
|
||
"")))
|
||
'()))))))
|
||
|
||
(define-syntax define-maybe
|
||
(lambda (x)
|
||
(syntax-case x (no-serialization prefix)
|
||
((_ stem (no-serialization))
|
||
(define-maybe-helper #f #f #'(_ stem)))
|
||
((_ stem (prefix serializer-prefix))
|
||
(define-maybe-helper #t #'serializer-prefix #'(_ stem)))
|
||
((_ stem)
|
||
(define-maybe-helper #t #f #'(_ stem))))))
|
||
|
||
(define-syntax-rule (define-maybe/no-serialization stem)
|
||
(define-maybe stem (no-serialization)))
|
||
|
||
(define (normalize-field-type+def s)
|
||
(syntax-case s ()
|
||
((field-type def)
|
||
(identifier? #'field-type)
|
||
(values #'(field-type def)))
|
||
((field-type)
|
||
(identifier? #'field-type)
|
||
(values #'(field-type %unset-value)))
|
||
(field-type
|
||
(identifier? #'field-type)
|
||
(values #'(field-type %unset-value)))))
|
||
|
||
(define (define-configuration-helper serialize? serializer-prefix syn)
|
||
|
||
(define (normalize-extra-args s)
|
||
"Extract and normalize arguments following @var{doc}."
|
||
(let loop ((s s)
|
||
(sanitizer* #f)
|
||
(serializer* #f))
|
||
(syntax-case s (sanitizer serializer empty-serializer)
|
||
(((sanitizer proc) tail ...)
|
||
(if sanitizer*
|
||
(syntax-violation 'sanitizer
|
||
"duplicate entry" #'proc)
|
||
(loop #'(tail ...) #'proc serializer*)))
|
||
(((serializer proc) tail ...)
|
||
(if serializer*
|
||
(syntax-violation 'serializer
|
||
"duplicate or conflicting entry" #'proc)
|
||
(loop #'(tail ...) sanitizer* #'proc)))
|
||
((empty-serializer tail ...)
|
||
(if serializer*
|
||
(syntax-violation 'empty-serializer
|
||
"duplicate or conflicting entry" #f)
|
||
(loop #'(tail ...) sanitizer* #'empty-serializer)))
|
||
(() ; stop condition
|
||
(values (list sanitizer* serializer*)))
|
||
((proc) ; TODO: deprecated, to be removed.
|
||
(not (or sanitizer* serializer*))
|
||
(begin
|
||
(warning #f (G_ "specifying serializers after documentation is \
|
||
deprecated, use (serializer ~a) instead~%") (syntax->datum #'proc))
|
||
(values (list #f #'proc)))))))
|
||
|
||
(syntax-case syn ()
|
||
((_ stem (field field-type+def doc extra-args ...) ...)
|
||
(with-syntax
|
||
((((field-type def) ...)
|
||
(map normalize-field-type+def #'(field-type+def ...)))
|
||
(((sanitizer* serializer*) ...)
|
||
(map normalize-extra-args #'((extra-args ...) ...))))
|
||
(with-syntax
|
||
(((field-getter ...)
|
||
(map (lambda (field)
|
||
(id #'stem #'stem #'- field))
|
||
#'(field ...)))
|
||
((field-predicate ...)
|
||
(map (lambda (type)
|
||
(id #'stem type #'?))
|
||
#'(field-type ...)))
|
||
((field-default ...)
|
||
(map (match-lambda
|
||
((field-type default-value)
|
||
default-value))
|
||
#'((field-type def) ...)))
|
||
((field-sanitizer ...)
|
||
#'(sanitizer* ...))
|
||
((field-serializer ...)
|
||
(map (lambda (type proc)
|
||
(and serialize?
|
||
(or proc
|
||
(if serializer-prefix
|
||
(id #'stem serializer-prefix #'serialize- type)
|
||
(id #'stem #'serialize- type)))))
|
||
#'(field-type ...)
|
||
#'(serializer* ...))))
|
||
(define (default-field-sanitizer name pred)
|
||
;; Define a macro for use as a record field sanitizer, where NAME
|
||
;; is the name of the field and PRED is the predicate that tells
|
||
;; whether a value is valid for this field.
|
||
#`(define-syntax #,(id #'stem #'validate- #'stem #'- name)
|
||
(lambda (s)
|
||
;; Make sure the given VALUE, for field NAME, passes PRED.
|
||
(syntax-case s ()
|
||
((_ value)
|
||
(with-syntax ((name #'#,name)
|
||
(pred #'#,pred)
|
||
(loc (datum->syntax #'value
|
||
(syntax-source #'value))))
|
||
#'(if (pred value)
|
||
value
|
||
(configuration-field-error
|
||
(and=> 'loc source-properties->location)
|
||
'name value))))))))
|
||
|
||
#`(begin
|
||
;; Define field validation macros.
|
||
#,@(filter-map (lambda (name pred sanitizer)
|
||
(if sanitizer
|
||
#f
|
||
(default-field-sanitizer name pred)))
|
||
#'(field ...)
|
||
#'(field-predicate ...)
|
||
#'(field-sanitizer ...))
|
||
|
||
(define-record-type* #,(id #'stem #'< #'stem #'>)
|
||
stem
|
||
#,(id #'stem #'make- #'stem)
|
||
#,(id #'stem #'stem #'?)
|
||
#,@(map (lambda (name getter def sanitizer)
|
||
#`(#,name #,getter
|
||
(default #,def)
|
||
(sanitize
|
||
#,(or sanitizer
|
||
(id #'stem
|
||
#'validate- #'stem #'- name)))))
|
||
#'(field ...)
|
||
#'(field-getter ...)
|
||
#'(field-default ...)
|
||
#'(field-sanitizer ...))
|
||
(%location #,(id #'stem #'stem #'-source-location)
|
||
(default (and=> (current-source-location)
|
||
source-properties->location))
|
||
(innate)))
|
||
|
||
(define #,(id #'stem #'stem #'-fields)
|
||
(list (configuration-field
|
||
(name 'field)
|
||
(type 'field-type)
|
||
(getter field-getter)
|
||
(predicate field-predicate)
|
||
(sanitizer
|
||
(or field-sanitizer
|
||
(id #'stem #'validate- #'stem #'- #'field)))
|
||
(serializer field-serializer)
|
||
(default-value-thunk
|
||
(lambda ()
|
||
(if (maybe-value-set? (syntax->datum field-default))
|
||
field-default
|
||
(configuration-missing-default-value
|
||
'#,(id #'stem #'% #'stem) 'field))))
|
||
(documentation doc))
|
||
...))))))))
|
||
|
||
(define no-serialization ;syntactic keyword for 'define-configuration'
|
||
'(no serialization))
|
||
|
||
(define-syntax define-configuration
|
||
(lambda (s)
|
||
(syntax-case s (no-serialization prefix)
|
||
((_ stem (field field-type+def doc custom-serializer ...) ...
|
||
(no-serialization))
|
||
(define-configuration-helper
|
||
#f #f #'(_ stem (field field-type+def doc custom-serializer ...)
|
||
...)))
|
||
((_ stem (field field-type+def doc custom-serializer ...) ...
|
||
(prefix serializer-prefix))
|
||
(define-configuration-helper
|
||
#t #'serializer-prefix #'(_ stem (field field-type+def
|
||
doc custom-serializer ...)
|
||
...)))
|
||
((_ stem (field field-type+def doc custom-serializer ...) ...)
|
||
(define-configuration-helper
|
||
#t #f #'(_ stem (field field-type+def doc custom-serializer ...)
|
||
...))))))
|
||
|
||
(define-syntax-rule (define-configuration/no-serialization
|
||
stem (field field-type+def
|
||
doc custom-serializer ...) ...)
|
||
(define-configuration stem (field field-type+def
|
||
doc custom-serializer ...) ...
|
||
(no-serialization)))
|
||
|
||
(define (empty-serializer field-name val) "")
|
||
(define serialize-package empty-serializer)
|
||
|
||
;; Ideally this should be an implementation detail, but we export it
|
||
;; to provide a simpler API that enables unsetting a configuration
|
||
;; field that has a maybe type, but also a default value. We give it
|
||
;; a value that sticks out to the reader when something goes wrong.
|
||
;;
|
||
;; An example use-case would be something like a network application
|
||
;; that uses a default port, but the field can explicitly be unset to
|
||
;; request a random port at startup.
|
||
(define %unset-value '%unset-marker%)
|
||
|
||
(define (maybe-value-set? value)
|
||
"Predicate to check whether a 'maybe' value was explicitly provided."
|
||
(not (eq? %unset-value value)))
|
||
|
||
;; Ideally there should be a compiler macro for this predicate, that expands
|
||
;; to a conditional that only instantiates the default value when needed.
|
||
(define* (maybe-value value #:optional (default #f))
|
||
"Returns VALUE, unless it is the unset value, in which case it returns
|
||
DEFAULT."
|
||
(if (maybe-value-set? value)
|
||
value
|
||
default))
|
||
|
||
;; A little helper to make it easier to document all those fields.
|
||
(define (generate-documentation documentation documentation-name)
|
||
(define (str x) (object->string x))
|
||
|
||
(define (package->symbol package)
|
||
"Return the first symbol name of a package that matches PACKAGE, else #f."
|
||
(let* ((module (file-name->module-name
|
||
(location-file (package-location package))))
|
||
(symbols (filter-map
|
||
identity
|
||
(module-map (lambda (symbol var)
|
||
(and (equal? package (variable-ref var))
|
||
symbol))
|
||
(resolve-module module)))))
|
||
(if (null? symbols)
|
||
#f
|
||
(first symbols))))
|
||
|
||
(define (generate configuration-name)
|
||
(match (assq-ref documentation configuration-name)
|
||
((fields . sub-documentation)
|
||
`((deftp (% (category "Data Type") (name ,(str configuration-name)))
|
||
(para "Available " (code ,(str configuration-name)) " fields are:")
|
||
(table
|
||
(% (formatter (asis)))
|
||
,@(map
|
||
(lambda (f)
|
||
(let ((field-name (configuration-field-name f))
|
||
(field-type (configuration-field-type f))
|
||
(field-docs (cdr (texi-fragment->stexi
|
||
(configuration-field-documentation f))))
|
||
(default (catch #t
|
||
(configuration-field-default-value-thunk f)
|
||
(lambda _ '%invalid))))
|
||
(define (show-default? val)
|
||
(or (string? val) (number? val) (boolean? val)
|
||
(package? val)
|
||
(and (symbol? val) (not (eq? val '%invalid)))
|
||
(and (list? val) (and-map show-default? val))))
|
||
|
||
(define (show-default val)
|
||
(cond
|
||
((package? val)
|
||
(symbol->string (package->symbol val)))
|
||
(((list-of package?) val)
|
||
(format #f "(~{~a~^ ~})" (map package->symbol val)))
|
||
(else (str val))))
|
||
|
||
`(entry (% (heading
|
||
(code ,(str field-name))
|
||
,@(if (show-default? default)
|
||
`(" (default: "
|
||
(code ,(show-default default)) ")")
|
||
'())
|
||
" (type: " ,(str field-type) ")"))
|
||
(para ,@field-docs)
|
||
,@(append-map
|
||
generate
|
||
(or (assq-ref sub-documentation field-name)
|
||
'())))))
|
||
fields)))))))
|
||
(stexi->texi `(*fragment* . ,(generate documentation-name))))
|
||
|
||
(define (configuration->documentation configuration-symbol)
|
||
"Take CONFIGURATION-SYMBOL, the symbol corresponding to the name used when
|
||
defining a configuration record with DEFINE-CONFIGURATION, and output the
|
||
Texinfo documentation of its fields."
|
||
;; This is helper for a simple, straight-forward application of
|
||
;; GENERATE-DOCUMENTATION.
|
||
(let ((fields-getter (module-ref (current-module)
|
||
(symbol-append configuration-symbol
|
||
'-fields))))
|
||
(display (generate-documentation `((,configuration-symbol ,fields-getter))
|
||
configuration-symbol))))
|
||
|
||
(define* (filter-configuration-fields configuration-fields fields
|
||
#:optional negate?)
|
||
"Retrieve the fields listed in FIELDS from CONFIGURATION-FIELDS.
|
||
If NEGATE? is @code{#t}, retrieve all fields except FIELDS."
|
||
(filter (lambda (field)
|
||
(let ((member? (member (configuration-field-name field) fields)))
|
||
(if (not negate?) member? (not member?))))
|
||
configuration-fields))
|
||
|
||
|
||
(define* (interpose ls #:optional (delimiter "\n") (grammar 'infix))
|
||
"Same as @code{string-join}, but without join and string, returns a
|
||
DELIMITER interposed LS. Support 'infix and 'suffix GRAMMAR values."
|
||
(when (not (member grammar '(infix suffix)))
|
||
(raise
|
||
(formatted-message
|
||
(G_ "The GRAMMAR value must be 'infix or 'suffix, but ~a provided.")
|
||
grammar)))
|
||
(fold-right (lambda (e acc)
|
||
(cons e
|
||
(if (and (null? acc) (eq? grammar 'infix))
|
||
acc
|
||
(cons delimiter acc))))
|
||
'() ls))
|
||
|
||
|
||
;;;
|
||
;;; Commonly used predicates
|
||
;;;
|
||
|
||
(define (list-of pred?)
|
||
"Return a procedure that takes a list and check if all the elements of
|
||
the list result in @code{#t} when applying PRED? on them."
|
||
(lambda (x)
|
||
(if (list? x)
|
||
(every pred? x)
|
||
#f)))
|
||
|
||
(define list-of-packages?
|
||
(list-of package?))
|
||
|
||
(define list-of-strings?
|
||
(list-of string?))
|
||
|
||
(define list-of-symbols?
|
||
(list-of symbol?))
|
||
|
||
|
||
;;;
|
||
;;; Special serializers
|
||
;;;
|
||
|
||
(define alist?
|
||
(list-of pair?))
|
||
|
||
(define serialize-file-like empty-serializer)
|
||
|
||
(define (text-config? config)
|
||
(list-of file-like?))
|
||
|
||
(define (serialize-text-config field-name val)
|
||
#~(string-append
|
||
#$@(interpose
|
||
(map
|
||
(lambda (e)
|
||
#~(begin
|
||
(use-modules (ice-9 rdelim))
|
||
(with-fluids ((%default-port-encoding "UTF-8"))
|
||
(with-input-from-file #$e read-string))))
|
||
val)
|
||
"\n" 'suffix)))
|
||
|
||
(define ((generic-serialize-alist-entry serialize-field) entry)
|
||
"Apply the SERIALIZE-FIELD procedure on the field and value of ENTRY."
|
||
(match entry
|
||
((field . val) (serialize-field field val))))
|
||
|
||
(define (generic-serialize-alist combine serialize-field fields)
|
||
"Generate a configuration from an association list FIELDS.
|
||
|
||
SERIALIZE-FIELD is a procedure that takes two arguments, it will be
|
||
applied on the fields and values of FIELDS using the
|
||
@code{generic-serialize-alist-entry} procedure.
|
||
|
||
COMBINE is a procedure that takes one or more arguments and combines
|
||
all the alist entries into one value, @code{string-append} or
|
||
@code{append} are usually good candidates for this."
|
||
(apply combine
|
||
(map (generic-serialize-alist-entry serialize-field) fields)))
|