converter: generate random and unique filesystem path

[tormath1]

Hi,

In the current behavior of ign-converter, we rely on a fsMap in order to mitigate a change between Ignition 2.x and 3.x:

map[string]string{"var": "/var"}

without this map or the correct values in it, we fail the translation in case we hit a filesystem with no associated path:

ign-converter/translate/v24tov31/v24tov31.go

Lines 50 to 54 in 984c88c

	for _, fs := range cfg.Storage.Filesystems {
	if _, ok := fsMap[fs.Name]; !ok {
	return util.NoFilesystemError(fs.Name)
	}
	}

Did we already consider in the past generating a random path associated to this filesystem name in order to circumvent this requirement ?

This is a proof-of-concept using randomized name: main...tormath1:tormath1/generate-path-upstream and the logic has been tested in Flatcar CI.

Thanks :)

[bgilbert]

We did discuss it in the past — actually I think I may have proposed it — but ultimately we decided against it. Unfortunately I don't remember why, I don't think we recorded it anywhere, and the lead developer at the time is no longer involved in the project.

[tormath1]

@bgilbert ok I see - good to know that you already considered it.

If well documented, it could be a default behavior:

• user provides a fsMap, it behaves as currently
• user does not provide a fsMap, it generates random path

If we really don't want to be a default behavior, we could even consider to supply a particular value (like we already do with map[string]string{"root": "/"]) - like map[string]string{"rand": ""}.