zfs discuss - Apr 2006 - Workaround for lack of client-side crossing of NFSv4 server-side mountpoints

Attached is an executable automount map that emulates the -hosts special
map, except that automountd updates executable automount map entries
much more often than -hosts ones (not at all).

So now I can see ZFS filesystems show up or disappear in
/znet/<servername>/... dynamically.

Only problem: automountd(1M) limits map entries to 4095 characters (so
this doesn''t work for borg :/).

This crappy limit comes from $SRC/cmd/fs.d/autofs/automount.h:

#define LINESZ          4096

So, you can put this in your /etc/auto_master:

/znet		auto_zhosts	-nosuid,nobrowse

And the attached script in /etc/auto_zhosts (don''t forget to chmod +x).

Cheers,

Nico
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#!/bin/ksh

exec 2>/dev/null

if [[ $# -eq 0 ]]
then
	logger -p daemon.error -t ${0##*/} "Incorrect usage by automountd!"
	exit 1
fi

entry="/ $1:/"
showmount -e $1|sort|grep ''^/''|while read p junk
do
	entry="$entry $p $1:$p"
done

print "$entry"

logger -p daemon.debug -t ${0##*/} "$entry"