[pkgsrc/trunk]: pkgsrc/pkgtools/rc.subr rc.subr: update to version 20210830

[khorben <khorben%pkgsrc.org@localhost>]

details:   https://anonhg.NetBSD.org/pkgsrc/rev/c91887ace6ad
branches:  trunk
changeset: 457702:c91887ace6ad
user:      khorben <khorben%pkgsrc.org@localhost>
date:      Mon Aug 30 21:45:02 2021 +0000

description:
rc.subr: update to version 20210830

This introduces the function load_rc_config_var(), as provided by NetBSD's own
rc.subr.

Tested on NetBSD/amd64 (unprivileged).

diffstat:

 pkgtools/rc.subr/Makefile      |   4 ++--
 pkgtools/rc.subr/files/rc.subr |  21 ++++++++++++++++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diffs (48 lines):

diff -r 6175d05aed0b -r c91887ace6ad pkgtools/rc.subr/Makefile
--- a/pkgtools/rc.subr/Makefile Mon Aug 30 20:22:44 2021 +0000
+++ b/pkgtools/rc.subr/Makefile Mon Aug 30 21:45:02 2021 +0000
@@ -1,7 +1,7 @@
-# $NetBSD: Makefile,v 1.35 2021/05/30 23:46:26 khorben Exp $
+# $NetBSD: Makefile,v 1.36 2021/08/30 21:45:02 khorben Exp $
 #
 
-PKGNAME=               rc.subr-20210517
+PKGNAME=               rc.subr-20210830
 CATEGORIES=            pkgtools
 
 MAINTAINER=            sbd%NetBSD.org@localhost
diff -r 6175d05aed0b -r c91887ace6ad pkgtools/rc.subr/files/rc.subr
--- a/pkgtools/rc.subr/files/rc.subr    Mon Aug 30 20:22:44 2021 +0000
+++ b/pkgtools/rc.subr/files/rc.subr    Mon Aug 30 21:45:02 2021 +0000
@@ -1,4 +1,4 @@
-# $NetBSD: rc.subr,v 1.17 2021/05/30 23:46:26 khorben Exp $
+# $NetBSD: rc.subr,v 1.18 2021/08/30 21:45:02 khorben Exp $
 #
 # Copyright (c) 1997-2002 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -869,6 +869,25 @@
        fi
 }
 
+#
+# load_rc_config_var cmd var
+#      Read the rc.conf(5) var for cmd and set in the
+#      current shell, using load_rc_config in a subshell to prevent
+#      unwanted side effects from other variable assignments.
+#
+load_rc_config_var()
+{
+       if [ $# -ne 2 ]; then
+               err 3 'USAGE: load_rc_config_var cmd var'
+       fi
+       eval $(eval '(
+               load_rc_config '$1' >/dev/null;
+               if [ -n "${'$2'}" ] || [ "${'$2'-UNSET}" != "UNSET" ]; then
+                       echo '$2'=\'\''${'$2'}\'\'';
+               fi
+       )' )
+}
+
 
 #
 # rc_usage commands