apt-key was changed in Debian Stretch to warn when you attempt to do
something like
apt-key add <file >/dev/null
or the equivalent pipeline. The manual page says
COMMANDS
add filename
(...)
Note: Instead of using this command a keyring should be placed
directly in the /etc/apt/trusted.gpg.d/ directory with a descriptive name
and either "gpg" or "asc" as file extension.
So, the right thing to do is to copy the file to the right path instead of
calling apt-key add with it.
^ I got the above snippet from the very tangentially related
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851774
** Bug watch added: Debian Bug tracker #851774
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851774
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https://bugs.launchpad.net/bugs/1605861
Title:
apt-key output should not be parsed (stdout is not a terminal)
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