Saturday, October 3, 2015

Arduino on OS X

Hi everybody!

Quick little blurb today..

Today I installed Arduino using homebrew/cask on my laptop, and was running into a little issue...

chmod: Unable to change file mode on /opt/homebrew-cask/Caskroom/arduino/1.6.5-r5/ Operation not permitted

Part of my issue was that I have an unusual homebrew install (installed with my 'admin' user, but my day to day user is not an admin).

I ended up following the steps outlined on this stackexchange post, and it didn't actually solve my problem, but it got my homebrew setup a lot happier for my non-admin user.

Then, I did the last thing any good programmer will do, and actually read what the error message was telling me!  The arduino process was trying to chmod a file, which meant that it's mode must be incorrect...

bash-3.2$ ls -la /opt/homebrew-cask/Caskroom/arduino/1.6.5-r5/ 
-rw-rw-r--  1 admin  admin  369784 Apr 14 16:30 /opt/homebrew-cask/Caskroom/arduino/1.6.5-r5/

I did an inspection of all the files in the avr/bin/ directory, and none of them had owner OR group execute permissions!

A quick little command fixed up my issue!

bash-3.2$ chmod g+x /opt/homebrew-cask/Caskroom/arduino/1.6.5-r5/*

I can now load sketches to my Arduino, and connect to the serial port!

Thanks for reading everyone!  I hope this helps someone with the same problem!

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