[src/trunk]: src Like /etc/rc.d/network, add the ability to put a '!' charact...

[brad <brad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0fa483f98ca6
branches:  trunk
changeset: 365876:0fa483f98ca6
user:      brad <brad%NetBSD.org@localhost>
date:      Sat Apr 30 13:48:09 2022 +0000

description:
Like /etc/rc.d/network, add the ability to put a '!' character as the
first character in /etc/gpio.conf and have the rest evaluated in a
shell.  It is useful to be able to do actions after setting up gpio
pins or attaching gpioiic(4).

diffstat:

 etc/rc.d/gpio              |  19 +++++++++++++++----
 share/man/man5/gpio.conf.5 |   5 ++++-
 2 files changed, 19 insertions(+), 5 deletions(-)

diffs (55 lines):

diff -r 35d8e15632d2 -r 0fa483f98ca6 etc/rc.d/gpio
--- a/etc/rc.d/gpio     Sat Apr 30 13:20:09 2022 +0000
+++ b/etc/rc.d/gpio     Sat Apr 30 13:48:09 2022 +0000
@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $NetBSD: gpio,v 1.1 2009/07/25 16:20:10 mbalmer Exp $
+# $NetBSD: gpio,v 1.2 2022/04/30 13:48:09 brad Exp $
 #
 
 # PROVIDE: gpio
@@ -18,10 +18,21 @@
        if [ -f /etc/gpio.conf ]; then
                echo "Configuring GPIO."
                cat /etc/gpio.conf |
+               collapse_backslash_newline |
                while read -r args; do
-                       args=${args%%#*}                # strip comments
-                       test -z "$args" && continue
-                       /usr/sbin/gpioctl -q $args
+                       case "$args" in
+                       "!"*)
+                               # Run arbitrary command in a subshell.
+                               ( eval "${args#*!}" )
+                               ;;
+                       *)
+                               (
+                                   args=${args%%#*}            # strip comments
+                                   test -z "$args" && continue
+                                   /usr/sbin/gpioctl -q $args
+                               )
+                               ;;
+                       esac
                done
        fi
 }
diff -r 35d8e15632d2 -r 0fa483f98ca6 share/man/man5/gpio.conf.5
--- a/share/man/man5/gpio.conf.5        Sat Apr 30 13:20:09 2022 +0000
+++ b/share/man/man5/gpio.conf.5        Sat Apr 30 13:48:09 2022 +0000
@@ -1,4 +1,4 @@
-.\"        $NetBSD: gpio.conf.5,v 1.2 2009/08/01 13:14:40 mbalmer Exp $
+.\"        $NetBSD: gpio.conf.5,v 1.3 2022/04/30 13:48:09 brad Exp $
 .\"
 .\" Copyright (c) 2009 Marc Balmer <marc%msys.ch@localhost>
 .\" All rights reserved.
@@ -40,6 +40,9 @@
 Lines starting with a hash
 .Pq Sq #
 and empty lines are ignored.
+If a line starts with
+.Sq \&! ,
+the rest of line will get evaluated as shell script fragment.
 All other lines are passed to
 .Xr gpioctl 8 .
 .Sh FILES