`npm install truffle -g` doesn't work on Mac for 4.1.x versions

• [ x] I’ve asked for help in the Truffle Gitter before filing this issue.

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Truffle NPM Module doesn’t install properly on a Mac OS

Truffle npm module 4.1.x versions does not install properly on a Mac OS.

Steps to Reproduce

1. Be on a Mac OS. My particular machine is Mac OS High Sierra 10.13.4, but I was experiencing this issue before I upgraded to High Sierra.
2. Open up terminal and execute npm install truffle -g

Expected Behavior

It should install without error.

Actual Results

➜  ~ npm i truffle -g
npm ERR! path /usr/local/lib/node_modules/truffle/build/cli.bundled.js
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall open
npm ERR! Error: EACCES: permission denied, open '/usr/local/lib/node_modules/truffle/build/cli.bundled.js'
npm ERR!  { Error: EACCES: permission denied, open '/usr/local/lib/node_modules/truffle/build/cli.bundled.js'
npm ERR!   cause:
npm ERR!    { Error: EACCES: permission denied, open '/usr/local/lib/node_modules/truffle/build/cli.bundled.js'
npm ERR!      errno: -13,
npm ERR!      code: 'EACCES',
npm ERR!      syscall: 'open',
npm ERR!      path: '/usr/local/lib/node_modules/truffle/build/cli.bundled.js' },
npm ERR!   stack: 'Error: EACCES: permission denied, open \'/usr/local/lib/node_modules/truffle/build/cli.bundled.js\'',
npm ERR!   errno: -13,
npm ERR!   code: 'EACCES',
npm ERR!   syscall: 'open',
npm ERR!   path: '/usr/local/lib/node_modules/truffle/build/cli.bundled.js' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/admin/.npm/_logs/2018-04-25T18_53_07_022Z-debug.log

Environment

• Operating System: Mac OS
• Ethereum client:
• Truffle version (truffle version): 4.1.x
• node version (node --version): 8.11.1 (also tried using 10.x and 7.x) with no luck
• npm version (npm --version): 5.6.0

Further Steps Taken to Resolve this issue

• Installing with sudo does not work
• Changing permission on global node_modules folder does not work (already has proper permissions
• npm install truffle@4.0.7 works and is the last version that does not throw the error.

Possible Causes

• Some change in the package.json or installation process that occurred from the tag 4.0.7 to 4.1.x

[Superjisan]

@cgewecke I figured out the issue. There was some antivirus software that was blocking access to some directories in our local. You can close this issue.

[cgewecke]

@Superjisan I’m using a node version manager called nvm because Truffle is built for 6.9.1 and sometimes it’s helpful to toggle down and make sure everything works.

• How are you installing? From node?
• when did you install Node?

One thing that occurs to me is that if this problem had begun with 4.0.7 we would have had dozens of reports since then, but yours is the first. Perhaps something has changed outside truffle more recently that’s causing it. Based on the sample of OS data above doesn’t seem like there’s much of pattern there. . .

@Joebob12 Anything else you can add might help isolate the cause of this, thanks!