no function clause matching cuttlefish_vmargs:'-stringify/1-lc$^0/1-0-'(undefined) [JIRA: RIAK-2498]

[rlipscombe]

escript: exception error: no function clause matching 
                 cuttlefish_vmargs:'-stringify/1-lc$^0/1-0-'(undefined) (src/cuttlefish_vmargs.erl, line 13)
  in function  cuttlefish_escript:engage_cuttlefish/1 (src/cuttlefish_escript.erl, line 390)
  in call from cuttlefish_escript:generate/1 (src/cuttlefish_escript.erl, line 259)

[rlipscombe]

It appears that you're required to have at least one setting with a vm_args mapping, and you have to have it in both the schema and in the source config file. This could do with either a better error message or a mention in the documentation (or both).

(I'm building this up from scratch because we're using relx for our releases).

[RJ]

I ran into this too, i'm including a vmargs setting in my main schema too for now as a workaround.

Fix in cuttlefish_vmargs is probably just a clause to turn undefined into an empty list. I don't think any vmargs settings are strictly necessary.

stringify(undefined) -> [];
stringify(.....

[rlipscombe]

Having just found this again after more than 5 years, I'm going to expand on my comment. You need at least schema/vm_args.schema containing:

{mapping, "nodename", "vm_args.-sname", []}.

...and you need a nodename = foo setting in app.conf.

[rlipscombe]

...but #152 (comment) works fine, once you persuade rebar3 to actually rebuild the damn thing.