Makes it easier to configure `rust-motd`. Currently, it takes care of
the following things:
* Creating a timer to regularly refresh the `motd`-text and a hardened
service (which is still root to get access to e.g. fs-mounts, but
read-only because of hardening flags).
* Disabling `PrintLastLog` in `sshd.conf` if the last-login feature of
`rust-motd` is supposed to be used.
* Ensure that the banner is actually shown when connecting via `ssh(1)`
to a remote server with this being enabled.
This config is removed when removing[1] fonts.fontconfig.hinting.style
option.
However, when adding[2] that option back, this config is missing.
[1]: 65592837b6
[2]: 659096dd89
Long story short: the SSH agent protocol doesn't support telling from
which tty the request is coming from, so the the pinentry curses prompt
appears on the login tty and messes up the output and may hang.
The current trick to workaround this is informing the gnupg agent every
time you start a shell: this assumes you will run `ssh` in the latest
tty, if you don't the latest tty will be messed up this time.
The ideal solution would be updating the tty exactly when (and where)
you run `ssh`. This is actually possible using a catch-all Match block
in ssh_config and using the `exec` feature that hooks a command to the
current shell.
Source for the new trick: https://unix.stackexchange.com/a/499133/110465
no change in rendered output. the html manual could render <screen>
blocks differently, but so far it hasn't (and if we need to make a
distinction we can use a special info string).
this notable also now interprets a markdown-flavored list in
triton_sd_config as actual markdown and renders it differently, but this
is arguably for the better (and probably the original intention).
no other rendering changes.
there seems to be a lot of markdown in the prometheus module that
should've been docbook instead. temporarily convert it to docbook to
keep the diff for the docbook->md conversion of prometheus inspectable.
When `nix.registry.<name>.flake` option is used, additional attributes of the flake were not written to the flake registry file because of a missing parenthesis.
