debarchwildcardtest/daklib_arch.py

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2014-11-26 11:24:57 +00:00
"""architecture matching
@copyright: 2014, Ansgar Burchardt <ansgar@debian.org>
@license: GPL-2+
"""
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
def _load_table(path):
table = []
with open(path, 'r') as fh:
for line in fh:
if not line or line.startswith('#'):
continue
table.append(line.split())
return table
_cached_cputable = None
def _cputable():
global _cached_cputable
if _cached_cputable is None:
_cached_cputable = _load_table('/usr/share/dpkg/cputable')
return _cached_cputable
_cached_arch2triplet = None
_cached_triplet2arch = None
def _triplettable():
global _cached_arch2triplet, _cached_triplet2arch
if _cached_arch2triplet is None or _cached_triplet2arch is None:
table = _load_table('/usr/share/dpkg/triplettable')
arch2triplet = {}
triplet2arch = {}
for row in table:
if '<cpu>' in row[0] or '<cpu>' in row[1]:
for cpu in _cputable():
replaced_row = [ column.replace('<cpu>', cpu[0]) for column in row ]
arch2triplet[replaced_row[1]] = replaced_row[0]
triplet2arch[replaced_row[0]] = replaced_row[1]
else:
arch2triplet[row[1]] = row[0]
triplet2arch[row[0]] = row[1]
_cached_arch2triplet = arch2triplet
_cached_triplet2arch = triplet2arch
return _cached_triplet2arch, _cached_arch2triplet
class InvalidArchitecture(Exception):
pass
def Debian_arch_to_Debian_triplet(arch):
parts = arch.split('-')
# Handle architecture wildcards
if 'any' in parts:
if len(parts) == 3:
return parts
elif len(parts) == 2:
return 'any', parts[0], parts[1]
else:
return 'any', 'any', 'any'
if len(parts) == 2 and parts[0] == 'linux':
arch = parts[1]
triplet = _triplettable()[1].get(arch, None)
if triplet is None:
return None
return triplet.split('-', 2)
def match_architecture(arch, wildcard):
# 'all' has no valid triplet
if arch == 'all' or wildcard == 'all':
return arch == wildcard
if wildcard is 'any' or arch == wildcard:
return True
triplet_arch = Debian_arch_to_Debian_triplet(arch)
triplet_wildcard = Debian_arch_to_Debian_triplet(wildcard)
if triplet_arch is None or len(triplet_arch) != 3:
raise InvalidArchitecture('{0} is not a valid architecture name'.format(arch))
if triplet_wildcard is None or len(triplet_wildcard) != 3:
raise InvalidArchitecture('{0} is not a valid architecture name or wildcard'.format(wildcard))
for i in range(0,3):
if triplet_arch[i] != triplet_wildcard[i] and triplet_wildcard[i] != 'any':
return False
return True