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Date: Wed, 18 Apr 2012 17:12:05 -0600
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To: Cygwin-L <cygwin AT cygwin DOT com>
Subject: Re: Can RPM packages be installed into Cygwin?
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On 4/18/2012 12:21 PM, De-Jian Zhao wrote:
> Is there a way to export the package info or lib
> info of setup.exe to rpm? If they can share information, the problem
> will be easily solved.

Big "if".

I said it before, but a .src.rpm built for one Linux distribution 
typically will not just recompile as-is on another Linux.  Expecting 
effortless portability to an entirely different platform like Cygwin is 
a pipe dream.

You seem to be envisioning a world where the RPM spec file says it 
requires libfoo-1.2.3.so or whatever, and that someone has ported that 
to Cygwin.  Then all you'd need to do is change RPM so it knows how to 
mung file names to cygfoo-1.2.3.dll or whatever.

That *could* happen.

What actually happens more commonly is:

- The Fedora spec file says it depends on the foo-devel package, which 
contains the .so file in question.

- The SuSE spec file says it depends on the foo-shared-lib package 
instead, because that's what the same package is called there.

- The Repoforge spec file depends on the platform spec file, but also on 
a passel of other infrastructure that has no direct correspondence to 
anything else, and without it it won't even rebuild on supported platforms.

- The third-party spec file which was built to support the first-party 
foo package from the upstream vendor (as opposed to the version in the 
distro) says it depends on the first-party foo-community-shared package.

So, which one should this mythical Cygwin .pkg -> RPM DB tool convert 
the dependencies to?

The first scenario above also ignores versioning issues.

This mythical automatic package porting tool you imagine cannot be 
magicked into existence with a "But if you just..." observation.  There 
is no "just".  It would probably take more work to build the automatic 
dependency translation tool than to just manually port everything.

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