Just noting that I was bitten by the locking bug too, which I solved
thusly:
TLOCK="$(mktemp -p /var/lock)"
LOCK="/var/lock/ifupdown-mountnfs"
if ln "$TLOCK "$LOCK" 2>/dev/null; then
do_start
rm -f "$LOCK"
fi
rm -f "$TLOCK"
(Here's another variant with one file less, but I'm not sure if it's
as atomic as the above. In this case either works, I think.)
LOCK="/var/lock/ifupdown-mountnfs"
if ln -s - "$LOCK" 2>/dev/null; then
do_start
rm -f "$LOCK"
fi
I think using /var/lock for its intended purpose might be a nice
idea. It's also automatically cleaned by /etc/init.d/bootclean - but
it specifically doesn't remove directories from neither /var/lock
nor /var/run, which is the problem you run into when the script is
interrupted for various reasons. So please don't use mkdir for locking.
-Samuel
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