Only set mode of new patch if the target file was removed before.
If the file is writable by the user, but owned by a different user, the
chmod will otherwise fail with "Operation not permitted".
Additionally make very sure that the file is only written if either the number
of links is <= 1 or the file was successfully removed.
Maybe this minimal COW code should be replaced by something from util.
import getopt
def fancyopts(args, options, state):
long = []
short = ''
map = {}
dt = {}
for s, l, d, c in options:
pl = l.replace('-', '_')
map['-'+s] = map['--'+l] = pl
if isinstance(d, list):
state[pl] = d[:]
else:
state[pl] = d
dt[pl] = type(d)
if (d is not None and d is not True and d is not False and
not callable(d)):
if s: s += ':'
if l: l += '='
if s: short = short + s
if l: long.append(l)
opts, args = getopt.getopt(args, short, long)
for opt, arg in opts:
if dt[map[opt]] is type(fancyopts): state[map[opt]](state, map[opt], arg)
elif dt[map[opt]] is type(1): state[map[opt]] = int(arg)
elif dt[map[opt]] is type(''): state[map[opt]] = arg
elif dt[map[opt]] is type([]): state[map[opt]].append(arg)
elif dt[map[opt]] is type(None): state[map[opt]] = True
elif dt[map[opt]] is type(False): state[map[opt]] = True
return args