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# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
"""Definitions that control how Spack creates Spec hashes."""
import spack.dependency as dp
hashes = []
class SpecHashDescriptor(object):
"""This class defines how hashes are generated on Spec objects.
Spec hashes in Spack are generated from a serialized (e.g., with
YAML) representation of the Spec graph. The representation may only
include certain dependency types, and it may optionally include a
canonicalized hash of the package.py for each node in the graph.
We currently use different hashes for different use cases."""
def __init__(self, deptype, package_hash, name, override=None):
self.deptype = dp.canonical_deptype(deptype)
self.package_hash = package_hash
self.name = name
hashes.append(self)
# Allow spec hashes to have an alternate computation method
self.override = override
@property
def attr(self):
"""Private attribute stored on spec"""
return '_' + self.name
#: Default Hash descriptor, used by Spec.dag_hash() and stored in the DB.
dag_hash = SpecHashDescriptor(
deptype=('link', 'run'), package_hash=False, name='hash')
#: Hash descriptor that includes build dependencies.
build_hash = SpecHashDescriptor(
deptype=('build', 'link', 'run'), package_hash=False, name='build_hash')
#: Hash descriptor used only to transfer a DAG, as is, across processes
process_hash = SpecHashDescriptor(
deptype=('build', 'link', 'run', 'test'),
package_hash=False,
name='process_hash'
)
#: Full hash used in build pipelines to determine when to rebuild packages.
full_hash = SpecHashDescriptor(
deptype=('build', 'link', 'run'), package_hash=True, name='full_hash')
#: Package hash used as part of full hash
package_hash = SpecHashDescriptor(
deptype=(), package_hash=True, name='package_hash',
override=lambda s: s.package.content_hash())
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