Config interface needs to be better documented

[Sergey Borovkov]

Previously we could install config with snap install snap-name config.yaml. This functionality is currently missing.

[Zygmunt Krynicki (zyga)]

The config support is being reimplemented. We will probably dupe this bug somewhere later to track it in one place.

To give you some perspective:
 - snapd hook support (30% done)
 - snapd config storage (not started)
 - snapd config hook
 - snap config API

At the end of the story you will have similar (but better and easier to integrate) configuration support.

[Jamie Bennett (jamiebennett)]

snap config is now implemented but the options it has are a little limited today. We will continue to enhance this over the coming months.

[Viktor Petersson (vpetersson)]

@Jamie Is this documentation up to date? https://developer.ubuntu.com/en/snappy/guides/config/

[Michael Vogt (mvo)]

@Viktor: This guide is unfortunately out-of-date, it applies to 15.04 only.

[Michael Vogt (mvo)]

I'm inclined to mark this as fix-released as we have support for the config interface for snaps now. You can put a meta/hooks/configure hook into your snap and that will run when doing "snap set $snap $option=value" etc. However this is not well documented currently, so maybe we need to leave the bug open because of that?

[Michael Vogt (mvo)]

There is a little bit of documentation now at https://github.com/snapcore/snapd/wiki/Configuration

[Kyle Fazzari (kyrofa)]

Note that there is also https://github.com/snapcore/snapd/wiki/hooks .

[Zygmunt Krynicki (zyga)]

I'm inclined to close this bug as WONTFIX.

The reporter seems to be asking for a way to install a single snap while supplying that snap with a configuration that is somehow applied during the installation process. There is no design for this feature in snapd 2.x. It may have existed in snapd 1.x, which was before my time in the project.

I'm happy to accept additional bugs to improve specific aspect of the configuration system but this bug does not seem to talk about that thing in particular.

[Zygmunt Krynicki (zyga)]

I've added the snapd task, which has a little bit more eyeballs from the snappy team, and marking this as WONTFIX given my rationale above. Please do feel free to reopen if I misunderstood this bug or to open additional bugs for specific improvements to documentation.