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# Create a temporary directory with name in $td, and handle POSIX-ish traps to
# remove it when the script exits.
td=
cleanup() {
[ -n "$td" ] && rm -fr -- "$td"
if [ "$1" != EXIT ] ; then
trap - "$1"
kill "-$1" "$$"
fi
}
for sig in EXIT HUP INT TERM ; do
# shellcheck disable=SC2064
trap "cleanup $sig" "$sig"
done
td=$(mktd "$self") || exit
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