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