Un-revert a snap

[YC Cheng]

Not sure if the new "refresh" design will check if the local installed one
have the same channel/revision or even hash that match the one from server.
(I think we should.) And if yes, are we going to add something like
"--force" in case of some mix channel situation ?

2016-10-27 20:42 GMT+08:00 Gustavo Niemeyer <gustavo.niemeyer at canonical.com>
:

> We actually have that already in the upcoming version. You'll be able to
> say "snap refresh --revison=N <snap>", similarly to how we can revert.
>
> That said, I think the expectation exposed in the first message is a
> reasonable one. We should probably not blacklist the current revision if
> the snap name was explicitly selected in the command line.
>
> On Oct 27, 2016 4:39 AM, "Didier Roche" <didrocks at ubuntu.com> wrote:
>
>> 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>:
>>
>>> 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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>>
>>
>>
>>
>>
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