juju-log is not compatible with python version

[Roger Peppe]

The python version of the juju-log command allows
some arguments starting with "--" to go through
as the message.

For instance:

   juju-log '--> foo'

will log the message "--> foo" in the python version,
but give an error in the Go version.

The python version does not ignore *all* flags.
For instance,

   juju-log '-->foo'

will yield an error in both versions,

Unfortunately the python charm helpers rely on this
functionality, so break under Go:

http://bazaar.launchpad.net/~charmers/charm-tools/trunk/view/head:/helpers/python/charmhelpers/__init__.py#L51

We have several possible solutions here:
1) Fix the charms so they don't print log messages starting with "--"
2) Fix juju so that the log command ignores all flags (not *too* unreasonable as we
don't support log levels)
3) Fix gnuflag so that it's more like python argparse in this respect.
4) ???

[William Reade (fwereade)]

1) is not really workable, because we don't control all charms.
2) feels pretty nasty, and I'd rather avoid it.
3) feels like the least worst solution; if it offends your sensibilities too much, adding a flag (as we did with AllowIntersperse) may be the way forward.

(I can't think of a (4).)

[Tim Penhey (thumper)]

Perhaps we just fix gnuflag to ignore parameters that start with - or -- that have an embedded space?