Un-revert a snap

[Didier Roche]

Le 27/10/2016 à 08:32, YC Cheng a écrit :
> I think we need a way to just Un-revert from rev 20 to rev 29 without
> remove rev 29.
>
> Shall we fire a bug for that if we don't have such method exists now ?

I think it's not that easy considering the associated data. You need to
swap them to restart from the latest version of data from rev 20 to copy
to 29. Explicitely removing that version makes sense in that context.
Have an unrevert command won't convey that notion.

Didier
>
>
> 2016-10-27 14:13 GMT+08:00 Didier Roche <didrocks at ubuntu.com
> <mailto:didrocks at ubuntu.com>>:
>
>     Le 27/10/2016 à 03:01, Marcos Alano a écrit :
>     > Hello guys,
>
>     Hey Marcos,
>     >
>     >
>     > Sorry if I'm in the wrong mailing list. That's the only one
>     about snap i
>     > could found. The question is: how I revert-revert (un-revert) a
>     snap? I
>     > can install a snap:
>     >
>     > (sudo snap install hello) after thatr I can upgrade a snap (snap
>     refresh
>     > hello --channel=beta hello) and finally revert (sudo snap revert
>     hello).
>     > But after that if I try to re-upgrade I just can't:
>     >
>     > $ sudo snap refresh --beta hello
>     >
>     > error: cannot refresh "hello": snap "hello" has no updates available
>     >
>     > I'm doing something wrong?
>
>     You are not doing it wrong :) The revert command "blacklists" this
>     particular snap revisions on purpose, so that you don't reupdate
>     to it.
>     However, there is a way to get back to it! You can remove explicitely
>     that revision (without removing the current snap). Data associated to
>     the reverted revision will be cleaned up as well.
>     Then, you can refresh.
>
>     In a concrete example with the hello snap:
>     20 is the revision in the stable channel, 29 corresponds to the
>     revision
>     in the beta channel.
>
>     # Install and update
>     $ snap install hello
>     $ snap list hello
>     Name   Version  Rev  Developer  Notes
>     hello         2.10     20   canonical  -
>     $ snap refresh hello --beta
>     $ snap list hello
>     Name   Version  Rev  Developer  Notes
>     hello         2.10.1   29   canonical  -
>
>     # Revert
>     $ snap revert hello
>     $ snap list hello
>     Name   Version  Rev  Developer  Notes
>     hello         2.10     20   canonical  -
>
>     # Remove reverted version (and associated data)
>     $ snap remove hello --revision=29
>     hello removed
>     $ snap list hello
>     Name   Version  Rev  Developer  Notes
>     hello         2.10     20   canonical  -
>
>     # Reupdate
>     $ snap refresh hello --beta
>     $ snap list hello
>     Name   Version  Rev  Developer  Notes
>     hello         2.10.1   29   canonical  -
>
>     I hope that answer your questions :)
>     Cheers,
>     Didier
>
>
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