nixpkgs/pkgs/development/interpreters/python/catch_conflicts/catch_conflicts.py
Johannes Bornhold 249b34aadc
python: Move catch_conflicts.py into subdirectory (#23600)
Python does add the script's directory into "sys.path". For the case of
"catch_conflicts.py" this means "/nix/store" is added to "sys.path". This can
result in very long delays if the store contains a lot of entries.

(moved from master commit 76213d102c)
2017-04-01 12:22:36 +02:00

31 lines
908 B
Python

import pkg_resources
import collections
import sys
do_abort = False
packages = collections.defaultdict(list)
for f in sys.path:
for req in pkg_resources.find_distributions(f):
if req not in packages[req.project_name]:
# some exceptions inside buildPythonPackage
if req.project_name in ['setuptools', 'pip', 'wheel']:
continue
packages[req.project_name].append(req)
for name, duplicates in packages.items():
if len(duplicates) > 1:
do_abort = True
print("Found duplicated packages in closure for dependency '{}': ".format(name))
for dup in duplicates:
print(" " + repr(dup))
if do_abort:
print("")
print(
'Package duplicates found in closure, see above. Usually this '
'happens if two packages depend on different version '
'of the same dependency.')
sys.exit(1)