freebsd-skq/etc/rc.d/zfsbe
Andriy Gapon ebd3b79f20 rc.d/zfsbe: a new script designed for boot environment support
Currently zfsbe ensures that subordinate filesystems are mounted at the
right mount points.
The script assumes that the subordinate filesystems of a boot environment
have their canmount property set to noauto, so that they are not
automatically mounted on boot.  Whereas the root filesystem is mounted
by the kernel, there was nothing to mount its subordinates.
rc.d/zfsbe fills that gap.

Discussed with:	allanjude, will
MFC after:	3 weeks
Differential Revision: https://reviews.freebsd.org/D7797
2016-10-13 06:19:54 +00:00

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#!/bin/sh
#
# $FreeBSD$
#
# PROVIDE: zfsbe
# REQUIRE: mountcritlocal
# Handle boot environment subordinate filesystems
# that may have canmount property set to noauto.
# For these filesystems mountpoint relative to /
# must be the same as their dataset name relative
# to BE root dataset.
. /etc/rc.subr
name="zfsbe"
rcvar="zfs_enable"
start_cmd="be_start"
stop_cmd="be_stop"
required_modules="zfs"
mount_subordinate()
{
local _be
_be=$1
zfs list -rH -o mountpoint,name,canmount,mounted -s mountpoint -t filesystem $_be | \
while read _mp _name _canmount _mounted ; do
# skip filesystems that must not be mounted
[ "$_canmount" = "off" ] && continue
# skip filesystems that are already mounted
[ "$_mounted" = "yes" ] && continue
case "$_mp" in
"none" | "legacy" | "/" | "/$_be")
# do nothing for filesystems with unset or legacy mountpoint
# or those that would be mounted over /
;;
"/$_be/"*)
# filesystems with mountpoint relative to BE
mount -t zfs $_name ${_mp#/$_be}
;;
*)
# filesystems with mountpoint elsewhere
zfs mount $_name
;;
esac
done
}
be_start()
{
if [ `$SYSCTL_N security.jail.jailed` -eq 1 ]; then
:
else
mount -p | while read _dev _mp _type _rest; do
[ $_mp = "/" ] || continue
if [ $_type = "zfs" ] ; then
mount_subordinate $_dev
fi
break
done
fi
}
be_stop()
{
}
load_rc_config $name
run_rc_command "$1"