Add new rc.conf parameter "jail_reverse_stop"

When a user defines "jail_list" in rc.conf the jails are started in the
order defined. Currently the jails are not are stopped in reverse order
which may break dependencies between jails/services and prevent a clean
shutdown. The new parameter "jail_reverse_stop" will shutdown jails in
"jail_list" in reverse order when set to "YES".

Please note that this does not affect manual invocation of the jail rc
script. If a user runs the command

  # service jail stop jail1 jail2 jail3

the jails will be stopped in exactly the order specified regardless of
jail_reverse_stop being defined in rc.conf.

PR:		196152
Approved by:	jamie
MFC after:	1 week
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D5233

1 files changed, 8 insertions, 2 deletions

diff --git a/etc/rc.d/jail b/etc/rc.d/jail
index b33f1b9..2d48989 100755
--- a/etc/rc.d/jail
+++ b/etc/rc.d/jail
@@ -521,7 +521,11 @@ jail_stop()
 		command=$jail_program
 		rc_flags=$jail_flags
 		command_args="-f $jail_conf -r"
-		$jail_jls name | while read _j; do
+		if checkyesno jail_reverse_stop; then
+			$jail_jls name | tail -r
+		else
+			$jail_jls name
+		fi | while read _j; do
 			echo -n " $_j"
 			_tmp=`mktemp -t jail` || exit 3
 			$command $rc_flags $command_args $_j >> $_tmp 2>&1
@@ -536,6 +540,7 @@ jail_stop()
 		return
 	;;
 	esac
+	checkyesno jail_reverse_stop && set -- $(reverse_list $@)
 	for _j in $@; do
 		_j=$(echo $_j | tr /. _)
 		_jv=$(echo -n $_j | tr -c '[:alnum:]' _)
@@ -571,5 +576,6 @@ jail_warn()
 load_rc_config $name
 case $# in
 1)	run_rc_command $@ ${jail_list:-_ALL} ;;
-*)	run_rc_command $@ ;;
+*)	jail_reverse_stop="no"
+	run_rc_command $@ ;;
 esac