Documentation/Example of server.parser.add_option

[glensc]

I'm trying to find anything to add new mount option.

Nothing useful found from README files, found something in examples/xml.py

    server.parser.add_option(mountopt="root", metavar="PATH", default='/',
                             help="mirror filesystem from under PATH [default: %default]")
    server.parse(values=server, errex=1)

    try:
        if server.fuse_args.mount_expected():
            os.chdir(server.root)
    except OSError:
        print("can't enter root of underlying filesystem", file=sys.stderr)
        sys.exit(1)

tried to replicate that to my program as

    server.parser.add_option(mountopt="cache_path", metavar="PATH", default="cache",
                             help="Cache downloads under PATH [default: %default]")
    server.parse(values=server, errex=1)
    server.main()

class MyFS(fuse.Fuse):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.cache_path = None

    def fsinit(self):
        print("fsinit, cache_path=", self.cache_path)

it appears in --help output as expected:

Options:
    --version              show program's version number and exit
    -h, --help             show this help message and exit
    -o opt,[opt...]        mount options
    -o cache_path=PATH     Cache downloads under PATH [default: cache]

yet cache_path remains None

from reading xml.py code, I understand the parse function adds it as property of object passed as values keyword argument, but in reality it does not seem to have effect.

[glensc]

Seems some unexpected behavior, the default="cache" argument to add_option() doesn't set the value to the default specified in that argument if no -o cache_path option is given.

the value remains to whatever was set in __init__