From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Tue, 11 Mar 2025 19:50:33 +0000 (+0900)
Subject: resolve question marks in /etc/hostname to characters hashed from machine ID (#36647)
X-Git-Tag: v258-rc1~1111
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ced634a62de036345b879144edf1c9f8498f0418;p=thirdparty%2Fsystemd.git

resolve question marks in /etc/hostname to characters hashed from machine ID (#36647)

So I have a bunch of particle os instances around, that I frequently
factory reset. and it's confusing, since they all have the same name.
Let's do something about this, and extend the hostname setup logic a bit
to deal better with "cattle" rather than "pet" deployments.
Specifically: if a hostname in /etc/hostname contains a bunch of
question marks we'll replace it with hex chars hashed from the machine
id.

This allows us to do something like this:

hostnamectl set-hostname --static 'funky-????-????-???'

and we'll end up with a hostname like `funky-baf4-b653-e230`
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ced634a62de036345b879144edf1c9f8498f0418