def merge_conda_files(files: List[Path], result_file: Path) -> None:
"""
Merges the given Conda environment files using the conda_merge package, and writes the merged file to disk.
:param files: The Conda environment files to read.
:param result_file: The location where the merge results should be written.
"""
# This code is a slightly modified version of conda_merge. That code can't be re-used easily
# it defaults to writing to stdout
env_definitions = [conda_merge.read_file(str(f)) for f in files]
unified_definition = {}
NAME = "name"
CHANNELS = "channels"
DEPENDENCIES = "dependencies"
name = conda_merge.merge_names(env.get(NAME) for env in env_definitions)
if name:
unified_definition[NAME] = name
try:
channels = conda_merge.merge_channels(
env.get(CHANNELS) for env in env_definitions)
except conda_merge.MergeError:
logging.error("Failed to merge channel priorities.")
raise
if channels:
unified_definition[CHANNELS] = channels
deps = conda_merge.merge_dependencies(
env.get(DEPENDENCIES) for env in env_definitions)
if deps:
unified_definition[DEPENDENCIES] = deps
with result_file.open("w") as f:
ruamel.yaml.dump(unified_definition,
f,
indent=2,
default_flow_style=False)
def test_merge_names():
"""Should leave only the last name"""
names = ['a', None, 'b', 'c', None, '']
assert cm.merge_names(names) == 'c'
assert cm.merge_names([]) is None
assert cm.merge_names([None, None]) is None