Recently I was writing bunch of automation scripts that were waiting for some file on a disk to appear.
I was in need of some kind of timeout if
operation that would wait for few minutes for that file, and fail if that file will not appear.
As I like to do I set up to search something like on internet, unsuccessfully. So I wrote it myself.
TIMEOUT_MINUTES=10
WAIT_SECONDS=5
START=1
END=$((($TIMEOUT_MINUTES * 60) / $WAIT_SECONDS))
for i in $(seq $START $END); do
if [ ! -f "/deploy/transfer_ok" ]
then
sleep $WAIT_SECONDS
else
break
fi
done
if [ ! -f "/deploy/transfer_ok" ]
then
echo "File transfer_ok not found."
exit 1
fi
echo "Complete."
Let's go over it to explain.
First few lines are basically our settings.
We want to wait up to 20 minutes, check each 5 seconds.
START
and END
will calculate how many tries we will do.
The for
cycle will go over a sequence created from START
and END
. Every step will check if the file is not present on disk. If no it will sleep for the WAIT_SECONDS
seconds. If so it will break the cycle.
After we are out of the loop, we will check one more time. If the file is still not present we will exit the script with error code.
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