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94 lines
3.4 KiB
94 lines
3.4 KiB
10 months ago
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import os
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import warnings
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from leapp.libraries.common.config.version import get_source_major_version
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try:
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import dnf
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except ImportError:
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dnf = None
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warnings.warn('Could not import the `dnf` python module.', ImportWarning)
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try:
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import hawkey
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except ImportError:
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hawkey = None
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warnings.warn('Could not import the `hawkey` python module.', ImportWarning)
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def _create_or_get_dnf_base(base=None):
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if not base:
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# The DNF command reads /etc/yum/vars/releasever, but the DNF library does not. It parses redhat-release
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# package to retrieve system's major version which it then uses as $releasever. However, some systems might
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# have repositories only for the exact system version (including the minor number). In a case when
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# /etc/yum/vars/releasever is present, read its contents so that we can access repositores on such systems.
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conf = dnf.conf.Conf()
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pkg_manager = 'yum' if get_source_major_version() == '7' else 'dnf'
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releasever_path = '/etc/{0}/vars/releasever'.format(pkg_manager)
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if os.path.exists(releasever_path):
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with open(releasever_path) as releasever_file:
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releasever = releasever_file.read().strip()
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conf.substitutions['releasever'] = releasever
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else:
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conf.substitutions['releasever'] = get_source_major_version()
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base = dnf.Base(conf=conf)
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base.init_plugins()
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base.read_all_repos()
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# configure plugins after the repositories are loaded
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# e.g. the amazon-id plugin requires loaded repositories
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# for the proper configuration.
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base.configure_plugins()
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base.fill_sack()
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return base
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def get_modules(base=None):
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"""
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Return info about all module streams as a list of libdnf.module.ModulePackage objects.
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"""
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if not dnf:
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return []
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base = _create_or_get_dnf_base(base)
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module_base = dnf.module.module_base.ModuleBase(base)
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# this method is absent on RHEL 7, in which case there are no modules anyway
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if not hasattr(module_base, 'get_modules'):
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return []
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return module_base.get_modules('*')[0]
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def get_enabled_modules():
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"""
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Return currently enabled module streams as a list of libdnf.module.ModulePackage objects.
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"""
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if not dnf:
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return []
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base = _create_or_get_dnf_base()
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modules = get_modules(base)
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# if modules are not supported (RHEL 7), base.sack._moduleContainer won't exist
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# luckily in that case modules are empty and the element won't even be accessed
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return [m for m in modules if base.sack._moduleContainer.isEnabled(m)]
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def map_installed_rpms_to_modules():
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"""
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Map installed modular packages to the module streams they come from.
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"""
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modules = get_modules()
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# empty on RHEL 7 because of no modules
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if not modules:
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return {}
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# create a reverse mapping from the RPMS to module streams
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# key: tuple of 4 strings representing a NVRA (name, version, release, arch) of an RPM
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# value: tuple of 2 strings representing a module and its stream
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rpm_streams = {}
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for module in modules:
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for rpm in module.getArtifacts():
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nevra = hawkey.split_nevra(rpm)
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rpm_key = (nevra.name, nevra.version, nevra.release, nevra.arch)
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rpm_streams[rpm_key] = (module.getName(), module.getStream())
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return rpm_streams
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