stop using repo2solv

[dcermak]

libzypp depends on libsolv-tools due to a single line of code where repo2solv is invoked:

libzypp/zypp/RepoManager.cc

Line 452 in fb7deaf

cmd.push_back( PathInfo( "/usr/bin/repo2solv" ).isFile() ? "repo2solv" : "repo2solv.sh" );

Would it be possible to drop this external call and use parts of libsolv directly? I know that https://github.com/openSUSE/libsolv/blob/master/tools/repo2solv.c is not exactly small, but maybe not all of its functionality is absolutely required?

This would allow us to make our containers a bit smaller by dropping the libsolv-tools dependency entirely.

[bzeller]

Since we are currently rewriting code to be executed async we'd need to build our own repo2solv binary ( libsolv has no thread support )... which probably would not be smaller than the one we are currently shipping..

[bzeller]

Once we are there we can try and build a binary that only does what we want and links libsolv directly and see if its smaller.

[mlandres]

We're currently using repo2solv and rpmdb2solv. And we wan't dumpsolv to be available on the system.
(we may depend on mergesolv in the future)

Maybe @mlschroe likes to split a few things into a basic libsolv-tools and move the stuff also covered by repo2solv into an extra package (updateinfoxml2solv, susetags2solv, rpmmd2solv, rpms2solv, helix2solv, deltainfoxml2solv..)

[lnussel]

libsolv could also expose those features as library function