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December 18, 2015 02:21
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Limit bash script to one running instance, while keeping it open to other calls
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#!/bin/bash | |
user_id_num=$(id -u) | |
pid_file="/tmp/foobar-$user_id_num/foobar-$user_id_num.pid" | |
lock_file="/tmp/foobar-$user_id_num/running.lock" | |
ps_id=$$ | |
function alertRunningPS () { | |
local PID=$(cat "$pid_file" 2> /dev/null) | |
echo "Lockfile present. ps id file: $PID" | |
echo "Checking if process is actually running or something left over from crash..." | |
if kill -0 $PID 2> /dev/null; then | |
echo "Already running, exiting" | |
exit 1 | |
else | |
echo "Not running, removing lock and continuing" | |
rm -f "$lock_file" | |
lockfile -r 0 "$lock_file" | |
fi | |
} | |
echo "Hello, checking some stuff before locking stuff" | |
# Lock further operations to one process | |
mkdir -p /tmp/foobar-$user_id_num | |
lockfile -r 0 "$lock_file" || alertRunningPS | |
# Do stuff here | |
echo -n $ps_id > "$pid_file" | |
echo "Running stuff in ONE ps" | |
sleep 30s | |
rm -f "$lock_file" | |
rm -f "$pid_file" | |
exit 0 |
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