- hostnames are construed from a reverse DNS notation of folder names
BREAKING CHANGE (without practical impact):
fup needs to be udpated to parse the reverse DNS notation back into
a hostname DNS label + a DNS domain (to set networking.domain).
However, since until now, no recursive hosts where allowed, this
can be safely done soonishly.
profiles and suites is created with the old mkProfileAttrs, this makes
the new auto-importing strategies backwards compatible. But warnings are
printed when using profiles and suites instructing you on how to switch
your profiles folder format and add suites to importables
The function picks up `.nix` files and stops recursing when it hits
a folder with a `default.nix`
This allows it to be used to collect hosts, overlays, and profiles
```
$ btrfs subvol show / >/dev/null; printf "%s\n" "$?"
ERROR: Could not search B-tree: Operation not permitted
1
```
Btrfs's `ioctl()` `BTRFS_IOC_TREE_SEARCH` requires elevation.
`btrfs subvol show <path>` may be called by `nixos-generate-config`, and
if `btrfs subvol show <path>` fails then `nixos-generate-config` fails.
Fixes `flk up` failures due to the presence of Btrfs volumes.
This sets shorthandOnlyDefinesConfig to false by default. Which means
those definitions can easily make use of the `imports` key. Without this,
they would have to pass a function to the options.
