#!/usr/bin/python -tt

# take a list of pkg names
# and a repo url

# for each pkg, resolve out its deps
# if anything new shows up - add it to the list of things to be resolved
# wash rinse repeat



import yum
import sys


provides_cache = {}


def resolve_deps(pkg, base):
    deps = []
    for req in pkg.requires:
        if req in provides_cache:
            deps.append(provides_cache[req])
            continue
        try:
            po = base.returnPackageByDep(req)
        except yum.Errors.YumBaseError, e:
            print "unresolved dep for %s of pkg %s" % (req[0], pkg.name)
            continue
        provides_cache[req] = po.name
        deps.append(po.name)

    return deps        
                


def main():

    repourl = 'http://download.fedoraproject.org/pub/fedora/linux/development/$basearch/os/'

    start_list = ['yum', '@core', 'anaconda', 'glibc', 'kernel']

    new_items = True
    parsed_items = []
    total_items = []
    total_items.extend(start_list)

    my = yum.YumBase()
    my.repos.disableRepo('*')
    my.add_enable_repo('myrepo', baseurls=[repourl])
    cachedir = yum.misc.getCacheDir()
    suffix='/$basearch/$releasever'
    my.repos.setCacheDir(cachedir + yum.parser.varReplace(suffix, my.yumvar))


    while new_items:
        new_items = False
        these_items = total_items
        for name in these_items:
            if name.startswith('@'):
                grpid = name[1:]
                group = my.comps.return_group(grpid)
                for pkg in group.mandatory_packages.keys() + group.default_packages.keys():
                    if n not in total_items:
                        new_items = True
                        total_items.append(n)
                total_items.remove(name)
                continue
            if name not in parsed_items:
                pkg = my.pkgSack.searchNevra(name=name)[0]
                deps = resolve_deps(pkg, my)
                for n in deps:
                     if n not in total_items:
                        new_items = True
                        total_items.append(n)
                parsed_items.append(name)

    print '\n'.join(sorted(total_items))            
                
if __name__ == '__main__':
    main()