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|
#!/bin/sh
timeout=30
match=false
if test $# -eq 0; then
cat <<EOF 1>&2
Usage:
$0 [ --timeout <seconds> | --no-match <regex> | --match <regex> ] -- <command>...
Repeatedly grep the output from <command>... until <regex> either
matches (--match) or does not match (--no-match); Pause for one second
between grep attempts.
Options:
--timeout <seconds>
Set the timeout (nr attempts * 1 second); default is
${timeout} attempts which is roughly ${timeout} seconds.
--match <regex>
Keep trying until the <regex> matches the output from <command>...
--no-match <regex>
Keep trying until the <regex> does not match the output from
<command>...
For instance, to wait for the connection east-west appears:
$0 --match east-west -- ipsec whack --trafficstatus
and to then wait for it to disappear:
$0 --no-match east-west -- ipsec whack --trafficstatus
EOF
exit 1
fi
# parse options
regex=
match=
while test "$#" -gt 1; do
case "$1" in
--timeout ) shift ; timeout=$1 ; shift ;;
--match ) match=true ; shift ; regex=$1 ; shift ;;
--no-match ) match=false ; shift ; regex=$1 ; shift ;;
-- ) shift; break ;;
--* ) echo "unknown option: $1" 1>&2 ; exit 1 ;;
* ) break ;;
esac
done
if test "${regex}" = ""; then
echo "missing --match <regex> or --no-match <regex>" 1>&2
exit 1
fi
# parse <command>...
if test "$#" -eq 0; then
echo "missing command" 1>&2
exit 1
fi
# "$@" is left containing the command to run
count=0
while true ; do
input=$("$@")
if output=$(echo "${input}" | grep "${regex}"); then
if ${match} ; then
echo "${output}"
exit 0
fi
elif ! ${match} ; then
exit 0
fi
count=$(expr ${count} + 1)
if test ${count} -ge ${timeout} ; then
echo timeout waiting ${timeout} seconds for "$@" to $(${match} && echo match || echo mismatch) "${regex}" 1>&2
echo "${input}" | tail -1000 | sed -e 's/^/output: /'
exit 1
fi
sleep 1
done
|
