This change fixes this system journal warning for
`fileSystems.<name>.fsType = "nfs4"` configurations:
systemd-fstab-generator[714]: Checking was requested for "192.168.0.6:/data", but it is not a device.
most of these are hidden because they're either part of a submodule that
doesn't have its type rendered (eg because the submodule type is used in
an either type) or because they are explicitly hidden. some of them are
merely hidden from nix-doc-munge by how their option is put together.
conversions were done using https://github.com/pennae/nix-doc-munge
using (probably) rev f34e145 running
nix-doc-munge nixos/**/*.nix
nix-doc-munge --import nixos/**/*.nix
the tool ensures that only changes that could affect the generated
manual *but don't* are committed, other changes require manual review
and are discarded.
While it might seem odd, 0.0.0.0/0 or ::/0 gateways are valid and
commonly used on point-to-point links (e.g. a wireguard tunnel) to
indicate that all traffic needs to be sent to a given interface.
systemd-networkd actually documents this as a valid configuration in its
man pages [1].
Tested to do the right thing in one of my NixOS containers using
a Wireguard tunnel as its default route.
[1] https://www.freedesktop.org/software/systemd/man/systemd.network.html#DefaultRouteOnDevice=
...if cfgExpandOnBoot == "all", otherwise it fails during runtime:
```
Aug 06 19:38:05 nixos zpool-expand-pools-start[981]: /nix/store/ka3vivdray82mi9dql12yf258gkw643l-unit-script-zpool-expand-pools-start/bin/zpool-expand-pools-start: line 3: zpool: command not found
```
This commit prevents warning messages like
```
systemd-fstab-generator: Checking was requested for "/path/to/device", but it is not a device.
```
in `dmesg` when one of the filesystems 9p, cifs, prl_fs or vmhgfs is added to the list of `fileSystems`.
This happens because the generated /etc/fstab entry contains a non-zero fsck pass number, which doesn't make sense for these filesystems.
now nix-doc-munge will not introduce whitespace changes when it replaces
manpage references with the MD equivalent.
no change to the manpage, changes to the HTML manual are whitespace only.
make (almost) all links appear on only a single line, with no
unnecessary whitespace, using double quotes for attributes. this lets us
automatically convert them to markdown easily.
the few remaining links are extremely long link in a gnome module, we'll
come back to those at a later date.
our xslt already replaces double line breaks with a paragraph close and
reopen. not using explicit para tags lets nix-doc-munge convert more
descriptions losslessly.
only whitespace changes to generated documents, except for two
strongswan options gaining paragraph two breaks they arguably should've
had anyway.
the conversion procedure is simple:
- find all things that look like options, ie calls to either `mkOption`
or `lib.mkOption` that take an attrset. remember the attrset as the
option
- for all options, find a `description` attribute who's value is not a
call to `mdDoc` or `lib.mdDoc`
- textually convert the entire value of the attribute to MD with a few
simple regexes (the set from mdize-module.sh)
- if the change produced a change in the manual output, discard
- if the change kept the manual unchanged, add some text to the
description to make sure we've actually found an option. if the
manual changes this time, keep the converted description
this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.
Without this change, configurations like
```nix
fileSystems."/path/to/bindMountedDirectory" = {
device = "/path/to/originalDirectory";
options = [ "bind" ];
};
```
will lead to a warning message in `dmesg`:
```
systemd-fstab-generator: Checking was requested for "/path/to/originalDirectory", but it is not a device.
```
This happens because the generated /etc/fstab entry contains a non-zero fsck pass number, which doesn't make sense for a bind mount.
