59 lines
2.4 KiB
Python
59 lines
2.4 KiB
Python
"""Pinned tool acquisition for PM's private Python engine; never worker API."""
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from __future__ import annotations
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from pathlib import Path
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from pm import paths
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from pm.lock import Facts
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from pm.package import InstallError
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from pm.registry import get_package
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from pm.store import Store, current_target
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def _toolchain(*, realize: bool = True, explicit: bool = False) -> tuple[Path, Path] | None:
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"""Resolve uv and Python without host discovery or recursive worker dispatch.
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A read-only probe never installs. Windows bundle builds need a verified
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writable interpreter so their venv redirectors can run outside the MSIX.
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"""
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from pm.ensure import (
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_install, _installed_location, _lockfile, _refuse_lazy,
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ensure, lazy_installs_allowed, sealed,
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)
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if realize:
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ensure("uv", explicit=explicit)
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lockfile = _lockfile()
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target = current_target()
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binaries = {}
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for name in ("uv", "python"):
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package = get_package(name)
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location = _installed_location(package, lockfile, target)
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if location is None:
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if not realize:
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return None
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raise InstallError(name, "pinned tool is unavailable", "run `hermes pm install`")
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if name == "python" and target.startswith("win32") and sealed():
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writable = paths.writable_store_root()
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if location[1].root != writable:
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copied = _installed_location(package, lockfile, target, verify=explicit, roots=(writable,))
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if copied is None:
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if not realize:
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return None
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if not explicit and not lazy_installs_allowed():
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raise _refuse_lazy(name, "a writable Python is required for bundled builds")
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copy_store = Store(writable)
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copy_facts = Facts(writable / "facts.json")
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_install(package, lockfile, copy_facts, copy_store, target, copy_from=location)
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copied = copy_facts, copy_store
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location = copied
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facts, store = location
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binary = package.binary(store.entry(facts.get(name)["entry"]), target)
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if binary is None or not binary.is_file():
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if not realize:
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return None
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raise InstallError(name, "installed binary is missing", "run `hermes pm install`")
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binaries[name] = binary
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return binaries["uv"], binaries["python"]
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