Re: Renaming a package, proper values for replaces/conflicts?

[Andreas Metzler <ametzler@downhill.at.eu.org>]

On 2004-03-07 Colin Watson <cjwatson@debian.org> wrote:
> On Sun, Mar 07, 2004 at 11:23:40AM +0100, Andreas Metzler wrote:
>> When jumping from 4.3 to 4.5 I'd like to rename pgrep to pcregrep and
>> to provide seamless upgrades I'd introduce a dummy package pgrep
>> depending on pcregrep, however replaces/conflicts gives me a headache.

>> Package: pcregrep
>> Architecture: any
>> Depends: ${shlibs:Depends}
>> Conflicts: pgrep(<<4.5)
>> Replaces: pgrep(<<4.5)

>> Package: pgrep
>> Section: oldlibs
>> Architecture: all
>> Depends: pcregrep

>> This looks correct, doesn't it? Any[1] version of pgrep fulfilling (<<4.5)
>> is no dummy package and contains /usr/bin/pcregrep, therefore pcregrep
>> must conflict with it.

> I think you just need Replaces: pgrep (<< 4.5), not Conflicts: at all.
> It's a straightforward file conflict. Conflicts: makes the upgrade
> painful because it adds extra complexity to the unpack order: this is
> why policy recommends against it.

So it is no bug that this file-conflict

| X:/ dpkg -i /apt-zusatz/pgrep_4.3-0.0.1_i386.deb 
| dpkg - warning: downgrading pgrep from 4.5-0.1 to 4.3-0.0.1.
| (Reading database ... 9669 files and directories currently installed.)
| Preparing to replace pgrep 4.5-0.1 (using
| .../pgrep_4.3-0.0.1_i386.deb) ...
| Unpacking replacement pgrep ...
| dpkg: error processing /apt-zusatz/pgrep_4.3-0.0.1_i386.deb
| (--install):
|  trying to overwrite `/usr/bin/pcregrep', which is also in package
|  pcregrep
| Errors were encountered while processing:
|   /apt-zusatz/pgrep_4.3-0.0.1_i386.deb

is not expressed in Conflicts: because basically we only care about
upgrading?
                cu andreas
-- 
"See, I told you they'd listen to Reason," [SPOILER] Svfurlr fnlf,
fuhggvat qbja gur juveyvat tha.
Neal Stephenson in "Snow Crash"