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<H1>[Mageia-dev] RFC: Add versioned require in rpm on rpm-helper</H1>
<B>Pascal Terjan</B>
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TITLE="[Mageia-dev] RFC: Add versioned require in rpm on rpm-helper">pterjan at gmail.com
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<I>Mon Apr 16 16:00:06 CEST 2012</I>
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<PRE>On Mon, Apr 16, 2012 at 14:45, Colin Guthrie <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">mageia at colin.guthr.ie</A>> wrote:
><i> 'Twas brillig, and Pascal Terjan at 16/04/12 14:35 did gyre and gimble:
</I>>><i> On Mon, Apr 16, 2012 at 14:23, Colin Guthrie <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">mageia at colin.guthr.ie</A>> wrote:
</I>>>><i> 'Twas brillig, and Thierry Vignaud at 16/04/12 13:04 did gyre and gimble:
</I>>>>><i> On 16 April 2012 13:15, Colin Guthrie <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">mageia at colin.guthr.ie</A>> wrote:
</I>>>>>><i> <snip>
</I>>>>>><i>
</I>>>>>><i> So just to make sure I'm following this right:
</I>>>>>><i>  1. Versioned require will fix urpmi-based upgrades.
</I>>>>>><i>
</I>>>>>><i>  2. Installer (fresh-install) will be fine because basesystem-minimal
</I>>>>>><i> will pull in rpm which will pull in rpm-helper.  WE can be confident
</I>>>>>><i> this will happen early.
</I>>>>><i>
</I>>>>><i> No you cannot on upgrade.
</I>>>>><i> Package ordering will depends on versioned requires.
</I>>>><i>
</I>>>><i> I don't understand... This is a fresh install, where did upgrade come
</I>>>><i> into it?
</I>>>><i>
</I>>>><i> Just to clarify, the *fresh install* case is fine, it's the *upgrade*
</I>>>><i> case (which I specifically outlined separately below to avoid confusion
</I>>>><i> - although that clearly failed) that has the problem. Correct?
</I>>>><i>
</I>>>>>><i>  3. Installer (upgrade) will still be broken as it does not treat the
</I>>>>>><i> rpm package inside the chroot as any kind of priority update that is
</I>>>>>><i> installed early in the upgrade process.
</I>>>>><i>
</I>>>>><i> installer upgrade will be OK if systemd unit packages require a recent
</I>>>>><i> enough rpm-helper
</I>>>><i>
</I>>>><i> I wasn't really looking for solutions, just trying to understand the
</I>>>><i> problem clearly. Proposed solutions often cloud the thinking about the
</I>>>><i> problem itself.
</I>>>><i>
</I>>>><i>
</I>>>><i> So putting "Requires(pre): systemd-units" in all packages providing a
</I>>>><i> systemd unit seems wrong (it doesn't require systemd-units at all, so
</I>>>><i> this is a fake requires).
</I>>>><i>
</I>>>><i> Putting "Requires(pre): rpm-helper >= $ver" also seems somewhat overkill
</I>>>><i> and hard to maintain (e.g. what if some other new thing goes into
</I>>>><i> rpm-helper? We have to rebuild all packages that use any of the macros
</I>>>><i> inside it to get the appropriate versioned require which seems awkward
</I>>>><i> and hard to maintain[1]).
</I>>><i>
</I>>><i> If a package requires a new script, it means there is a call to this
</I>>><i> script, so I would expect that it was built after this new script was
</I>>><i> added.
</I>><i>
</I>><i> OK, but at present most of the packages that make use of %_post_service
</I>><i> and friends do not actually require rpm-helper at all. They simply rely
</I>><i> on it being there from basesystem-minimal.
</I>><i>
</I>><i> So I guess doing autorequires would work in most cases - this case i
</I>><i> somewhat special as we're retro fitting the requirement, and thus need a
</I>><i> mass-rebuild.
</I>><i>
</I>><i> I guess I can live with this if someone can do the necessary foo to add
</I>><i> the appropriate requires automatically.
</I>
I don't think this is possible without patching rpm :(
The scripts adding dependencies are working on the list of files in the package.
The dependencies for scriptlets are added by rpm-build itself (and
only for the interpreter).
><i> I can't help but feel this would still be more appropriately dealt with
</I>><i> in the installer by making it honour priority updates, even on a
</I>><i> not-currently-running machine.
</I>
Well this does not guarantee anything, the packages may become part of
the priority upgrade (like any depending on perl) and be installed
before the new rpm-helper
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