Do task for all roles

[zakame]

Implement an --all flag to enable Cinnamon to run tasks on all roles, as described in #34.

[kentaro]

LGTM cc: @shibayu36

[shibayu36]

I think

$ cinnamon :all deploy

is better than

$ cinnamon --all deploy

--(option) is for global setting, but --all is only for role. Also the first argument for cinnamon command is for role. so I think using the special keyword like :all for the first argument is better than --all for the global option.

how do you think about that? @zakame

[zakame]

I thought about that too; in fact, we have a similar internal implementation of that at work, but that one simply aggregated all hosts from the roles into one, discarding role-specific parameters.

I chose the Getopt::Long option so I can call tasks on all roles regardless of CLI param ordering (the only ordering observed would be the way the tasks are called, e.g.)

$ cinnamon --all --config=my/alt/deploy.pl do:this do:that do:next

and in going along with the global option, I'd think --all would refer to the global role.

Finally, I don't know if other folks using Cinnamon may be doing their own hacks regarding this and have an :all role already on their configs, so in anticipating that, I think the long option would also be safer.