[Rpm-maint] [rpm-software-management/rpm] RFE: Handle disttag (#589)

[Ivan Zakharyaschev]

On Sat, 10 Nov 2018, Jeff Johnson wrote:

> I should point out that there are far bigger issues than the separator if DistTag is incorporated as a package identifier:
> 
> 1) precedence of comparison: is it EVRD (as is common with %{?dist} usage) or is it DEVR (as some might wish)

To satisfy everyone, two variants can be introduced: an epoch-like disttag 
and a release-like disttag. Wouldn't it be quite fun? (Then, of course, 
I'd put the epoch-like disttag between the name and the epoch in the 
format.)

> 2) interoperability when mixtures of packages are installed with/without DistTag.
> 
> 3) the dbiFindByLabelFoo() reads every package header in Packages (~100Mb), possibly multiple times, trying various matches. The proper way to perform a query like this is to create indices for each field and do a join to minimize the amount of data that must be read. A change to an rpmdb of that magnitude is highly unlikely.
> 
> (aside)
> There is also the issues of patterns in queries: a join will not solve that problem. RPM5 uses a btree with a prefix key to find candidates to retrieve rather than retrieving every header. But I digress ...
> 
> Warning:
> My comments here will be deleted within a week: I have negative interest in participating in a DistTag discussion that I have already had, and already implemented. Have fun!


-- 
Best regards,
Ivan


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