How to circumvent "apt-key output should not be parsed"?

Question

I'm automating my Docker installation. Something like this:

if apt-key fingerprint 0EBFCD88 | grep "Key fingerprint = 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88" > /dev/null
then
  # proceed
fi

This worked fine in older versions of apt-key, but recent versions have two issues:

1. A different output format: I can hack around that

2. A warning:

   Warning: apt-key output should not be parsed (stdout is not a terminal)
   

Clearly, I can hack around this as well, just redirect stderr to /dev/null. It just made me curious:

How do these fine folks suggest I verify my key fingerprints? Or am I getting this fundamentally wrong by wanting to automate it, does that defeat the point? (I think not, since I still manually lifted the expected fingerprint from the website, but feel free to tell me otherwise...)

Answer 1

From apt-key sources, you can set APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE to a non-empty value to disable this warning.

You can also use "grep -q" so you don't need to redirect stdout in /dev/null either.