whatrequires.py

import solv
import sys

pool = solv.Pool()
pool.setarch()

for r in ('rawhide', 'rawhide-source'):
    repo = pool.add_repo(r)
    f = solv.xfopen(f'/var/cache/dnf/{r}.solv')
    repo.add_solv(f)
    f.close()

pool.addfileprovides()
pool.createwhatprovides()

sel = pool.select(sys.argv[1], solv.Selection.SELECTION_NAME | solv.Selection.SELECTION_WITH_SOURCE)
s = pool.best_solvables(sel.solvables())[0]
if s.arch != 'src':
    src = s.lookup_sourcepkg()[:-4]
    sel = pool.select(src, solv.Selection.SELECTION_CANON | solv.Selection.SELECTION_SOURCE_ONLY)
    if sel.isempty():
        raise Exception(s)
    s = sel.solvables()[0]

ss = f'{s}.rpm'
for p in pool.solvables:
    if p.arch == 'src' or p.lookup_sourcepkg() != ss:
        continue

    sel = pool.Selection_all()
    sel.matchsolvable(p, 0, solv.SOLVABLE_REQUIRES)
    if sel.isempty():
        continue

    print(f'{p} is required by:')
    for pp in sel.solvables():
        if pp.arch not in {'src', 'nosrc'} and pp.lookup_sourcepkg() == ss:
            continue
        print(f'  - {pp}')
        for dep in pp.lookup_deparray(solv.SOLVABLE_REQUIRES):
            print(f'    - {dep}')