env.sh conflicts on OSX

[Lyndon Leggate]

Hi,

When running the source rl_coach/env.sh on a mac, the following errors are thrown:

hostname: illegal option -- i
usage: hostname [-fs] [name-of-host]
readlink: illegal option -- f
usage: readlink [-n] [file ...]

Looking around the web, readlink on OSX isn't standard (naturally). But a port of it can be installed by:

brew install coreutils

That then gives a greadlink that works in the same way as on other platforms (i.e. it supports the -f option).

I think the -i on hostname is trying to get the IP address of the local machine? On OSX that can be got with:

ipconfig getifaddr en0

But that's perhaps a little brittle as you need to specify which network interface to check. The following command is a little less brittle, but returns multiple IPs (for each interface):

ifconfig | grep "inet " | grep -Fv 127.0.0.1 | awk '{print $2}'

Or perhaps just limit the grep to give a single result:

ifconfig | grep "inet " | grep -m 1 -Fv 127.0.0.1 | awk '{print $2}'

I just tested that with my wifi + LAN on/off and it did detect the switch over correctly (i.e. always giving me an active IP). So maybe that's the solution?

[Chris Rhodes]

Yep it gets the IP of the host so it can be passed into any S3 clients as the endpoint url so minio can be used as an S3 store.

[Joseph Nielsen]

I documented all my workarounds for Mac Pro. Thanks for sharing!
https://gist.github.com/joezen777/6657bbe2bd4add5d1cdbd44db9761edb

[Chris Rhodes]

Much appreciated. I will look at baking it into the scripts/improving the setup for OSX. For now I will put that link in the readme

[Dan Jarvis]

FYI, I found this guide (based on joezen777's original guide) for installing on the Mac from the DeepRacer Slack group.

[Dan Jarvis]

Fix attempted in PR #78.

[breadcentric]

Please use https://github.com/aws-deepracer-community/deepracer-for-cloud

Closing