yml yaml file extension

[Thomas Kriechbaumer]

netplan currently only accepts *.yaml files.
However, it is quite common for YAML files to have a .yml file extension.
https://en.wikipedia.org/wiki/YAML

I would propose allowing both file extensions when searching for config files, i.e., here:
https://github.com/CanonicalLtd/netplan/blob/b2c6d87503f86e684c8aa693fe2295a0c27768b0/netplan/configmanager.py#L98 (and possible other places)

It would also be nice for netplan to at least give a "No config files found!" error message to avoid endless frustration with sysadmins wondering why their configs are not found and applied.

[Thomas Kriechbaumer (w-thomas-q)]

Somebody is defacing the URLs in my initial bug description!

The links I provided are:
https://en.wikipedia.org/wiki/YAML

https://github.com/CanonicalLtd/netplan/blob/b2c6d87503f86e684c8aa693fe2295a0c27768b0/netplan/configmanager.py#L98 (and possible other places)

[Mathieu Trudel-Lapierre (cyphermox)]

Sure. This seems like a simple fix / enhancement.

[Scott Mcdermott (smemsh)]

just got burned by this. could not figure out why it wouldn't work, spent some time banging head. there's no error emitted, just fails to produce anything.

lack of error is arguably worse than not globbing for the standard extension of yaml files...

[Lukas Märdian (slyon)]

In a discussion upstream the .yml file extension was rejected, because it isn't part of the YAML standard:
https://github.com/CanonicalLtd/netplan/pull/106

But it was agreed upon, that netplan should warn users if they try to load a valid netplan config from a .yml file and note that they should be using the .yaml file extension.