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Strongswan

#!/bin/bash
#
# Wait until a given file appears
#
# Params:
# $1 - filename
# $2 - maximum time to wait in seconds, default is 5 seconds

if [[ $# -lt 1 || $# -gt 2 ]]
then
	echo "invalid arguments"
	exit 1
fi

secs=$2
[ ! $secs ] && secs=5

let steps=$secs*10
for i in `seq 1 $steps`
do
	# -f does not work for special files (e.g. UNIX domain sockets), use ls
	# instead
	ls $1 >/dev/null 2>&1
	[ $? -eq 0 ] && exit 0
	sleep 0.1
done

echo "File '$1' not available after $secs second(s)"
exit 1