`sys.execute()` causes exception in OpenResty

[vanpelt]

For some reason: https://github.com/torch/sys/blob/master/init.lua#L37-L40 is returning nil when launched through OpenResty which causes an exception.

app.lua

local sys = require 'sys'

Running resty app.lua results in:

$ resty app.lua 
/Users/vanpelt/torch/install/share/lua/5.1/sys/init.lua:40: attempt to index local 's' (a nil value)

(sys.execute is being called to set sys.prefix)

I have no clue why popen is behaving strangely, but thought the nil output case should be handled. Any idea's why child processes are failing in this context?

[varun-suresh]

Did you figure out how to get around this problem? I'm running into the same problem as well.