gnu: Add openresolv.

* gnu/packages/dns.scm (openresolv): New variable.

gnu/local.mk

@@ -34,6 +34,7 @@
 # Copyright © 2020 Felix Gruber <felgru@posteo.net>
 # Copyright © 2020 Ryan Prior <rprior@protonmail.com>
 # Copyright © 2020 Jan Wielkiewicz <tona_kosmicznego_smiecia@interia.pl>
+# Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
 #
 # This file is part of GNU Guix.
 #
@@ -1322,6 +1323,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/openmpi-mtl-priorities.patch		\
   %D%/packages/patches/openocd-nrf52.patch			\
   %D%/packages/patches/openssh-hurd.patch			\
+  %D%/packages/patches/openresolv-restartcmd-guix.patch	\
   %D%/packages/patches/openssl-runpath.patch			\
   %D%/packages/patches/openssl-1.1-c-rehash-in.patch		\
   %D%/packages/patches/openssl-c-rehash-in.patch		\

gnu/packages/dns.scm

@@ -16,6 +16,7 @@
 ;;; Copyright © 2020 Pierre Langlois <pierre.langlois@gmx.com>
 ;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
 ;;; Copyright © 2020 Leo Famulari <leo@famulari.name>
+;;; Copyright © 2020 Brice Waegeneire <brice@waegenei.re>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1001,3 +1002,34 @@ (define-public maradns
 consists of a UDP-only authoritative DNS server for hosting domains, and a UDP
 and TCP-capable recursive DNS server for finding domains on the internet.")
     (license license:bsd-2)))
+
+(define-public openresolv
+  (package
+    (name "openresolv")
+    (version "3.10.0")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://roy.marples.name/downloads/openresolv/"
+                                  "openresolv-" version ".tar.xz"))
+              (sha256
+               (base32
+                "01ms6c087la4hk0f0w6n2vpsb7dg4kklah2rqyhz88p0vr9bqy20"))
+              (patches
+               (search-patches "openresolv-restartcmd-guix.patch"))))
+    (build-system gnu-build-system)
+    (arguments
+     `(#:tests? #f                      ; No test suite
+       #:configure-flags
+       (list (string-append "--sysconfdir=/etc"))
+       #:make-flags
+       (list (string-append "SYSCONFDIR=/" (assoc-ref %outputs "out") "/etc"))))
+    (home-page "https://roy.marples.name/projects/openresolv/")
+    (synopsis "Resolvconf POSIX compliant implementation, a middleman for resolv.conf")
+    (description "openresolv is an implementation of @command{resolvconf}, the
+middleman between the network configuration services and
+@file{/etc/resolv.conf}.  @command{resolvconf} itself is just a script that
+stores, removes and lists a full @file{resolv.conf} generated for the
+interface.  It then calls all the helper scripts it knows about so it can
+configure the real @file{/etc/resolv.conf} and optionally any local
+nameservers other than libc.")
+    (license license:bsd-2)))

gnu/packages/patches/openresolv-restartcmd-guix.patch

@@ -0,0 +1,34 @@
+From 7f0ce36828ec1e130bee857b8236ca091e4d8a2c Mon Sep 17 00:00:00 2001
+From: Brice Waegeneire <brice@waegenei.re>
+Date: Sat, 9 May 2020 15:52:06 +0200
+Subject: [PATCH] Add RESTARTCMD for Guix System.
+
+---
+
+openresolv need to know how to restart the nscd service, this patch teach it
+to do it on Guix System by using shepherd.
+
+ resolvconf.in | 7 +++++++
+ 1 file changed, 7 insertions(+)
+
+diff --git a/resolvconf.in b/resolvconf.in
+index 3cad04d..5ef5294 100644
+--- a/resolvconf.in
++++ b/resolvconf.in
+@@ -369,6 +369,13 @@ detect_init()
+ 			then
+ 				/etc/rc.d/$1 restart
+ 			fi'
++	elif [ -e /gnu/store ] && [ -e /run/current-system/profile ]; then
++		# Guix System
++		RESTARTCMD='
++			if /run/current-system/profile/bin/herd status $1 2>&1
++			then
++				/run/current-system/profile/bin/herd restart $1
++			fi'
+ 	else
+ 		for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do
+ 			[ -d $x ] || continue
+-- 
+2.26.0
+