Add apt-rpm (altlinux-specific) repositories support

[enp]

Hi,

Are you have a plans for apt-rpm (altlinux-specific) repositories support?

See https://www.altlinux.org/Ownrepo for reference how to create apt-rpm repositories in altlinux environment

Technically, apt-rpm index is just one file pkglist which is really simple to read via rpm-python binding:

import rpm

with open('pkglist.classic') as f:
    hdrs = rpm.readHeaderListFromFD(f.fileno())
    for hdr in hdrs:
        for tag in hdr.keys():
            print(f'{tag} => {hdr[tag]}')
    del hdrs

I suppose function writeHeaderListToFD should write similar data to index file back - I see mention of this function in https://fossies.org/linux/misc/old/rpm-5.2.1.tar.gz/rpm-5.2.1/CHANGES but no implementation in /usr/lib64/python3/site-packages/rpm/__init__.py

So, see C implementation of reading/writing pkglist file:

• https://git.altlinux.org/gears/a/apt-repo-tools.git?p=apt-repo-tools.git;a=blob;f=src/pkglist-query.cc
• https://git.altlinux.org/gears/a/apt-repo-tools.git?p=apt-repo-tools.git;a=blob;f=src/genpkglist

Is it possible to implement something like above in artipie with own rpm implementation?