On Wed, Nov 10, 2021 at 11:50 AM Kamil Paral <kpa...@redhat.com> wrote:
>
> On Tue, Nov 9, 2021 at 3:47 PM Ben Cotton <bcot...@redhat.com> wrote:
>>
>> So I still disagree with you, but my position is softening. I'd rather
>> we have a clearly-defined and understood set of criteria that I
>> disagree with in some places than to try to make every criterion match
>> my preferences. :-) So while I disagree, I'm happy to move forward
>> with this.
>
>
> Hmm, let's try something different first. I'll provide a list of scenarios 
> below, and I'd like everyone participating in this discussion to respond 
> whether they think that scenario should be blocking or non-blocking (for 
> Final), and ideally why. Perhaps we can distill some reasonable requirements 
> if we don't talk about it abstractly or with dnf-like comparisons, but with 
> actual examples.
>
> Scenario 1:
> User clicks Install on pkg A. She waits until that is done. Pkg A gets 
> installed correctly. Then she clicks Install on pkg B. That returns an error. 
> After closing and re-opening the package manager, pkg B can be installed. (In 
> other words, only one operation can be performed, and then the manager needs 
> to get restarted).
>
> Scenario 2:
> User clicks Install on pkg A. She waits until that is done. Pkg A gets 
> installed correctly. Then she clicks Remove on pkg A. That returns an error. 
> After closing and re-opening the package manager, pkg A can be removed. (This 
> problem only affects two subsequent operations on the same package. 
> Performing multiple operations on distinct packages works fine).
>
> Scenario 3:
> User clicks Install on pkg A. Before that is finished, she navigates the 
> interface elsewhere. E.g. seeing the home screen, searching for something, 
> showing the installed apps, showing the updates, etc. Because of this 
> interaction, pkg A installation process is incorrectly aborted (cancelled), 
> i.e. it doesn't get installed. It's a bug, not a design decision. The system 
> is in a consistent state, internal databases are valid.
>
> Scenario 4:
> User clicks Install on pkg A. Before that is finished, she clicks Install on 
> pkg B. Because of this interaction, pkg A installation process is incorrectly 
> aborted (cancelled), i.e. it doesn't get installed, and pkg B installation is 
> started (and finished correctly). It's a bug, not a design decision. The 
> system is in a consistent state, internal databases are valid.
>
> Scenario 5:
> User clicks Install on pkg A. Before that is finished, she clicks Install on 
> pkg B. A cryptic error shows up (the user doesn't understand it), e.g. 
> "installation constraint failed: failed to acquire a lock: pkg B". It's a 
> bug, not a design decision. Repeating that action only shows the error again. 
> Pkg A is eventually installed OK, but pkg B installation wasn't even started. 
> Once pkg A is installed, pkg B installation can be started and finished OK.
>
> Scenario 6:
> User clicks Install on pkg A. Before that is finished, she clicks Install on 
> pkg B. An understandable dialog pops up: "Please wait until pkg A 
> installation is finished". Once pkg A is installed, pkg B installation can be 
> started.
>
> Scenario 7:
> User clicks Install on pkg A. Before that is finished, she performs a 
> different valid action. That can be navigating to a different screen, or 
> clicking Install on pkg B (the particular action is not important in this 
> scenario). That second action triggers a bug and pkg A installation is 
> incorrectly aborted in a non-clean manner. The system ends up in an 
> *inconsistent* state, i.e. internal databases (like the rpmdb or dnfdb) are 
> damaged. No further package operations (installations/removals/updates) are 
> possible, everything results in a cryptic error. Rebooting the system doesn't 
> help.

My take, all except 6 are blocking.



-- 
Chris Murphy
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