Ceph

So, really, this applies to all the "Ceph global" options that the frontend doesn't have reason to do anything special with. These are all the 'global' options that are valid for most clients (rados, rbd, radosgw, ceph-fuse, etc. as well as ceph):

early_options:

--version: show version to stdout, exit
--conf/-c: set config file path
--cluster: set cluster name
-i (daemons only)/--id/--user(all): set 'id' part of type.id name
-n/--name: set 'type.id' name

"parse_argv" options:

--show-conf: dump cf with cerr << and exit
--show-config: expand_all_meta(), then _show_config to cout, exit
--show-config-value: find a value, expand_meta(), and show to cout, exit

--foreground/-f: set:
daemonize false
pid_file ""

-d: set:
daemonize false
log_file ""
pid_file ""
log_to_stderr true
err_to_stderr true
log_to_syslog false

--monmap/-M: set monmap from file
--mon-host/-m: set mon_host (mon to contact, otherwise random)
--bind: set public_addr
--keyfile/-K: keyfile
--keyring/-k: keyring file

--<config-option>=<val> or
--<config-option> <val>
dashes or underscores in config-option are legal
--no-<config-option> sets bools to false

Initial pull request:

https://github.com/ceph/ceph/pull/2483

Need to design a solution so that all clients can use the global options.