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import ctypes
from ctypes.util import find_library
import operator
def load_alpm(name=None):
# Load the alpm library and set up some of the functions we might use
if name is None:
name = find_library('alpm')
if name is None:
# couldn't locate the correct library
return None
try:
alpm = ctypes.cdll.LoadLibrary(name)
except OSError:
return None
try:
alpm.alpm_version.argtypes = ()
alpm.alpm_version.restype = ctypes.c_char_p
alpm.alpm_pkg_vercmp.argtypes = (ctypes.c_char_p, ctypes.c_char_p)
alpm.alpm_pkg_vercmp.restype = ctypes.c_int
except AttributeError:
return None
return alpm
ALPM = load_alpm()
class AlpmAPI(object):
OPERATOR_MAP = {
'=': operator.eq,
'==': operator.eq,
'!=': operator.ne,
'<': operator.lt,
'<=': operator.le,
'>': operator.gt,
'>=': operator.ge,
}
def __init__(self):
self.alpm = ALPM
self.available = ALPM is not None
def version(self):
if not self.available:
return None
return ALPM.alpm_version()
def vercmp(self, ver1, ver2):
if not self.available:
return None
return ALPM.alpm_pkg_vercmp(str(ver1), str(ver2))
def compare_versions(self, ver1, oper, ver2):
func = self.OPERATOR_MAP.get(oper, None)
if func is None:
raise Exception("Invalid operator %s specified" % oper)
if not self.available:
return None
res = self.vercmp(ver1, ver2)
return func(res, 0)
def main():
api = AlpmAPI()
print api.version()
print api.vercmp(1, 2)
print api.compare_versions(1, '<', 2)
if __name__ == '__main__':
main()
# vim: set ts=4 sw=4 et:
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