How to automate prompts during apt upgrades in bash?
I am running several Raspberry Pi 4 on Bookworm. On these, I have a bash file as follows:
sudo apt -y update
read -t 600 -p "Pausing 10 minutes between Update and Upgrade"
sudo apt -y upgrade
read -t 600 -p "Pausing 10 minutes between Upgrade and AutoRemove"
sudo apt -y autoremove
Sometimes I get the below screen:
I also run this as a cron job (once a quarter) that calls the above script, but it fails when run via the cron. How can I recognize that this GUI prompt is up and input the right answer?
Important Note: This doesn't happen always, so I want it to recognize when it happens and only then provide the correct input.
For the specific case of dpkg frontends such as apt, it's built to be able to disable interactive prompts altogether -- you don't need to automate the prompts, you can just turn them off.
Export the environment variable DEBIAN_FRONTEND=noninteractive while you run apt, and you'll get no more interactive prompts; if you need to assert specific settings, you can set them noninteractively with utilities from debconf-utils -- see its documentation.
Concretely:
sudo DEBIAN_FRONTEND=noninteractive apt -y update
read -t 600 -p "Pausing 10 minutes between Update and Upgrade"
sudo DEBIAN_FRONTEND=noninteractive apt -y upgrade
read -t 600 -p "Pausing 10 minutes between Upgrade and AutoRemove"
sudo DEBIAN_FRONTEND=noninteractive apt -y autoremove
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