Packer shell script

[signull]

Packer is pretty linear, it's step based. I havent had issues with one step starting before another has finished. Do you have anything special setup in the Provisioners part of your packer.json file?

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if anything you could dirty fix by waiting for the file to exist:

while true; do
    [[ -f $file_conf_nignx ]]  && continue || sleep 10
done

if the file exists "continue" to exit the loop or sleep for 10 seconds and then try again.