#!/bin/sh
#
# Obnam test: test lock files.
#
# Copyright 2012-2014  Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

die()
{
    echo "$@" 1>&2
    exit 1
}

[ "$#" = 2 ] || die "Bad usage, read source!"

NCLIENTS="$1"
COUNTER="$2"
directory="$(mktemp -d)"
pids="$(mktemp)"

for i in $(seq "$NCLIENTS")
do
    ./lock-and-increment "$directory" "$COUNTER" &
    echo "$!" >> "$pids"
done

errors=0
for pid in $(cat "$pids")
do
    if ! wait "$pid"
    then
        echo "at least one client failed" 1>&2
        errors=1
    fi
done

n=$(cat "$directory/counter")
wanted=$(expr "$COUNTER" '*' "$NCLIENTS")
if [ "$n" != "$wanted" ]
then
    echo "counted to $n should be $wanted" 1>&2
    errors=1
fi

rm -rf "$directory" "$pids"
exit $errors