o Implement the stop_boot subroutine [1]. This subroutine can be used by

  scripts in rc.d to stop rc(8) from booting into multi-user mode when
  a critical or severe error condition is encountered.

o Modify scripts in etc/rc.d that already implemented this functionality
  independently.

o Document it.

[1] - This subroutine was implemented in FreeBSD in rc.d/fsck. I moved it
      to rc.subr(8). Our version differs slightly in that it takes an
      optional argument to stop the boot even if "autoboot" is not set.

Obtained from: NetBSD
MFC after: 2 weeks

1 files changed, 22 insertions, 0 deletions

diff --git a/etc/rc.subr b/etc/rc.subr
index 8cdb6e7..061f0b9 100644
--- a/etc/rc.subr
+++ b/etc/rc.subr
@@ -40,6 +40,7 @@
 #
 
 : ${rcvar_manpage:='rc.conf(5)'}
+: ${RC_PID:=$$}; export RC_PID
 
 #
 #	Operating System dependent/independent variables
@@ -161,6 +162,27 @@ reverse_list()
 	echo $_revlist
 }
 
+# stop_boot always
+#	If booting directly to multiuser or $always is enabled,
+#	send SIGTERM to the parent (/etc/rc) to abort the boot.
+#	Otherwise just exit.
+#
+stop_boot()
+{
+	local always
+
+	if [ -n "$1" ] && checkyesno $1; then
+		always=true
+	else
+		always=false
+	fi
+	if [ "$autoboot" = yes -o "$always" = true ]; then
+		echo "ERROR: ABORTING BOOT (sending SIGTERM to parent)!"
+		kill -TERM ${RC_PID}
+	fi
+	exit 1
+}
+
 #
 # mount_critical_filesystems type
 #	Go through the list of critical filesystems as provided in