[Rpm-maint] RFC: RPMTAG_IDENTITY (whitelist filter)

[Panu Matilainen]

On 8/23/18 12:01 AM, Vladimir D. Seleznev wrote:
> You convinced me that there should be whitelist filter, so I rewrote
> code for it. Follow Panu suggestion [1] I wrote .C generator to filter
> proper rpm tags. 

Sorry for the terribly late response, I keep intending and intending and 
somehow almost a month passed :(

Also shows that its a while since the initial discussion: I don't recall 
suggesting that :D but nevermind.

Another possibility that wouldn't need a separate generator script would 
be just including that info in the tag table itself, similarly to how 
"extension" is there, although I think there's no API to access it ATM 
(another idea that was never finished). Might as well make it a flags 
bitfield where we can cram such stuff and rpmTagGetFlags() or so to 
fetch the data...

> But currently it does not allow this suggestion [2] by
> jbj@:
> 
> "The members (and ordering) of the IDENTITY tag set might also
> need to be configurable without recompiling."
> 
> Currently I have no idea what is better way to do that. May be one of
> solution can be to define some macro that contains tag that should be in
> calculation, but this doest seem to be convenient and practical.
> 
> Also its value may be needs a prefix for versioning tag value. When new
> tags are marked to be involve to calculating the prefix changes. I think
> the prefix should also include a vendor identifier e.g. fc, alt, mga,
> suse etc.

I dunno why it should be vendor specific, we rather try to avoid such 
things in the first place.

> 
> While here is marker for tags that values should be involve to identity
> calculation, I think here should be special case for some of string
> array tags: a marker for processing array before calculation. For
> example, we want to filter some of value from package provides but we
> don't want to exclude the whole array from identity calculation. I think
> it could be done with one more marker with argument of array processing
> function that return (char *) — the result of string processing. There
> is difficulty that RPMTAG_PROVIDE* is three separate tags and I have no
> idea how to take it in consideration.

Why do you want to filter provides?

	- Panu -

> 
> About patches: they are RFC, 0002 is mostly draft: there are obviously
> marked more than needed tags. I forgot to enhance commit message for
> 0003, so I'll do it in the next iteration.
> 
> Please comment.
> 
> [1] http://lists.rpm.org/pipermail/rpm-maint/2018-April/007725.html
> [2] http://lists.rpm.org/pipermail/rpm-maint/2018-April/007721.html
> 
> 
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