env.npm_execpath and $execPath

[NoriSte]

Hi
An issue found when working on my nprr package and npm-run-all makes me open this issue.

It seems that the env.npm_execpath is set to require.main.filename "instead" of $execPath (used instead to set env.npm_node_execpath). I don't know if it's right or not and I'm not aware of all the possible side-effects of changing it.

The original problem comes from my nprr package that runs a package.json script through npm.run()(by importing npm itself). Here's the code that does that.

The "guilty" LOC of this project:

npm-lifecycle/index.js

Line 96 in e2270ff

env.npm_execpath = require.main.filename

Original issue: mysticatea/npm-run-all#181

I think that the correct label for this issue should be "support".

Thank you for all
Stefano