2

if I have a deployment.sh, it has two parameters: environment and release version.

deployment.sh uat release1
deployment.sh prod release1

I want to make at any time: the deployment.sh with same environment and release version can be run in singleton. But deployment.sh uat release1 and deployment.sh prod release1 can be run concurrently.

How to do this. Thx

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Robert Chen
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  • See https://unix.stackexchange.com/questions/48505/how-to-make-sure-only-one-instance-of-a-bash-script-runs?rq=1 for more ideas. – Alex Tullenhoff Jun 30 '20 at 03:42

1 Answers1

5

One way of doing this is file locking which is explicitly for picking just one among several processes. See man flock:

#! /bin/bash

category="$1"
if [ 'uat' != "$category" ] && [ 'prod' != "$category" ]; then
    exit 2
fi


(
    flock -n 9 || exit 1
    # ... commands executed under lock ...
) 9>/var/lock/"$category"
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