merge_lockfile.py

"""PDM Lock merge strategy driver.

To automatically relock after merging like ``git -X theirs ...``.

Used with an entry in ``pyproject.toml``::

    [tool.pdm.scripts]
    merge_lockfile = "tasks/merge_lockfile.py"
    lockall = "pdm lock -G:all"

and an entry in ``.git/config``::

    [merge "pdm-lock-theirs-relock"]
      name = A merge driver used to resolve pdm.lock updates from main
      driver = pdm run merge_lockfile %O %A %B && pdm run lockall

"""
import sys

from pathlib import Path


ancestors_version, current_version, other_branch_version = sys.argv[1:]

print(f"{ancestors_version=}", f"{current_version=}", f"{other_branch_version=}")

# Write to current version and exit 0 to signal successful merge
with Path.open(other_branch_version) as fp, Path.open(current_version, "w") as wfp:
    wfp.write(fp.read())

# We'll exit 0 by default if the above succeeded.
# sys.exit(0)

# Optionally, we could re-lock here.