This is the default name of the docker container. That's why I reported
it here. For me it is a problem with the install script. It shouldn't
fail to install within a default docker container.
regarding b) how do I make docker select that automatically? I wasn't
able to find any way to install postfix silently except by the commands
and environment variables listed above.
{quote}
Fqdn's are a defined standard, and if your name would be like one it should
work.
Never the less we try to catch and handle some common issues.
It might be worth for your to look at your hostname in general (report your
full name here please) and the code that the install runs you can find in
/var/lib/dpkg/info/postfix.postinst - check the function myfqdn for that.
If therein is an issue that could be improved to support your kind of hostname
better that might be worth a talk.
{quote}
I already provided that. The hostname is just "cc1a572af0dc" without
domain. It is set by docker. I don't know how I would influence that at
build time.
I also provided where in the post install script it fails and why. It fails
within that function when you try to work around the missing domain part in the
fqdn by appending the "search" part from /etc/resolv.conf. That part generates
an invalid host name and writes that into the postfix configuration and than
tries to start postfix using it which makes dpkg fail.
THe resolv.conf is also written by docker and therefore also outside of my
control.
And here is an asciinema recording, maybe that helps to show what the problem
is:
* https://asciinema.org/a/MszFQIxhFi5l5Agh8EQAGC26n
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https://bugs.launchpad.net/bugs/1906970
Title:
dpkg hook hostname error
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