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# substitutions.py
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# Config file substitutions.
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#
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# Copyright (C) 2012-2016 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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import os
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import re
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import dnf
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import dnf.exceptions
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ENVIRONMENT_VARS_RE = re.compile(r'^DNF_VAR_[A-Za-z0-9_]+$')
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class Substitutions(dict):
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# :api
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def __init__(self):
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super(Substitutions, self).__init__()
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self._update_from_env()
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def _update_from_env(self):
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numericvars = ['DNF%d' % num for num in range(0, 10)]
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for key, val in os.environ.items():
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if ENVIRONMENT_VARS_RE.match(key):
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self[key[8:]] = val # remove "DNF_VAR_" prefix
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elif key in numericvars:
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self[key] = val
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def update_from_etc(self, installroot, varsdir=("/etc/yum/vars/", "/etc/dnf/vars/")):
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# :api
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for vars_path in varsdir:
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fsvars = []
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try:
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dir_fsvars = os.path.join(installroot, vars_path.lstrip('/'))
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fsvars = os.listdir(dir_fsvars)
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except OSError:
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continue
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for fsvar in fsvars:
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filepath = os.path.join(dir_fsvars, fsvar)
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if os.path.isfile(filepath):
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try:
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with open(filepath) as fp:
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val = fp.readline()
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if val and val[-1] == '\n':
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val = val[:-1]
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except (OSError, IOError):
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continue
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self[fsvar] = val
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