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authorBruno Victal <mirai@makinata.eu>2023-01-27 21:06:11 +0000
committerLudovic Courtès <ludo@gnu.org>2023-02-09 01:07:39 +0100
commit22dd558c70901a336de97187f0470be584571158 (patch)
tree9fede9cd565a0453324ade4975524af3c205125f /gnu/services
parent7ad98c571e1bd19b36b1cde7a49868b589fdb3ca (diff)
services: Add hosts-service-type.
* gnu/services/base.scm (<host>): New record type. (host): New procedure. (hosts-service-type): New variable. * doc/guix.texi (Service Reference): Document it. Co-authored-by: Ludovic Courtès <ludo@gnu.org>
Diffstat (limited to 'gnu/services')
-rw-r--r--gnu/services/base.scm75
1 files changed, 75 insertions, 0 deletions
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 9e799445d2..e9fdafd5d0 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -20,6 +20,7 @@
;;; Copyright © 2022 Guillaume Le Vaillant <glv@posteo.net>
;;; Copyright © 2022 Justin Veilleux <terramorpha@cock.li>
;;; Copyright © 2022 ( <paren@disroot.org>
+;;; Copyright © 2023 Bruno Victal <mirai@makinata.eu>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -103,6 +104,14 @@
console-font-service
virtual-terminal-service-type
+ host
+ %host
+ host?
+ host-address
+ host-canonical-name
+ host-aliases
+ hosts-service-type
+
static-networking
static-networking?
static-networking-addresses
@@ -685,6 +694,72 @@ to add @var{device} to the kernel's entropy pool. The service will fail if
(rngd-configuration
(rng-tools rng-tools)
(device device))))
+
+;;;
+;;; /etc/hosts
+;;;
+
+(define (valid-name? name)
+ "Return true if @var{name} is likely to be a valid host name."
+ (false-if-exception (not (string-any char-set:whitespace name))))
+
+(define-compile-time-procedure (assert-valid-name (name valid-name?))
+ "Ensure @var{name} is likely to be a valid host name."
+ ;; TODO: RFC compliant implementation.
+ (unless (valid-name? name)
+ (raise
+ (make-compound-condition
+ (formatted-message (G_ "host name '~a' contains invalid characters")
+ name)
+ (condition (&error-location
+ (location
+ (source-properties->location procedure-call-location)))))))
+ name)
+
+(define-record-type* <host> %host
+ ;; XXX: Using the record type constructor becomes tiresome when
+ ;; there's multiple records to make.
+ make-host host?
+ (address host-address)
+ (canonical-name host-canonical-name
+ (sanitize assert-valid-name))
+ (aliases host-aliases
+ (default '())
+ (sanitize (cut map assert-valid-name <>))))
+
+(define* (host address canonical-name #:optional (aliases '()))
+ "Return a new record for the host at @var{address} with the given
+@var{canonical-name} and possibly @var{aliases}.
+
+@var{address} must be a string denoting a valid IPv4 or IPv6 address, and
+@var{canonical-name} and the strings listed in @var{aliases} must be valid
+host names."
+ (%host
+ (address address)
+ (canonical-name canonical-name)
+ (aliases aliases)))
+
+(define hosts-service-type
+ ;; Extend etc-service-type with a entry for @file{/etc/hosts}.
+ (let* ((serialize-host-record
+ (lambda (record)
+ (match-record record <host> (address canonical-name aliases)
+ (format #f "~a~/~a~{~^~/~a~}~%" address canonical-name aliases))))
+ (host-etc-service
+ (lambda (lst)
+ `(("hosts" ,(plain-file "hosts"
+ (format #f "~{~a~}"
+ (map serialize-host-record
+ lst))))))))
+ (service-type
+ (name 'etc-hosts)
+ (extensions
+ (list
+ (service-extension etc-service-type
+ host-etc-service)))
+ (compose concatenate)
+ (extend append)
+ (description "Populate the @file{/etc/hosts} file."))))
;;;