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Configure homebrew permissions to allow multiple users on MAC OSX. Any user from the admin group will be able to manage the homebrew and cask installation on the machine.
#!/bin/sh
# Configure homebrew permissions to allow multiple users on MAC OSX.
# Any user from the admin group will be able to manage the homebrew and cask installation on the machine.
# allow admins to manage homebrew's local install directory
chgrp -R admin /usr/local
chmod -R g+w /usr/local
# allow admins to homebrew's local cache of formulae and source files
chgrp -R admin /Library/Caches/Homebrew
chmod -R g+w /Library/Caches/Homebrew
# if you are using cask then allow admins to manager cask install too
chgrp -R admin /opt/homebrew-cask
chmod -R g+w /opt/homebrew-cask
@jmbldwn
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jmbldwn commented Dec 11, 2016

Curious, why do we need all of /usr/local to be admin, vs. just /usr/local/Cellar?

@mhariri
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mhariri commented Jan 25, 2017

some brew applications use other directories under /usr/local, for example mysql that uses /usr/local/var

@miketwo
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miketwo commented Apr 27, 2017

Might want to wrap the calls on /Library/Caches with an "if exists" -- mine didn't.

@Weltraumschaf
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Weltraumschaf commented Jun 6, 2017

Why is this not the default for brew?

@luanzhu
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luanzhu commented Jun 11, 2017

Thank you!

@carande
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carande commented Jun 11, 2017

Very useful!

@brianlow
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brianlow commented Jul 4, 2017

Changing perms on all of /usr/local breaks postgres (data directory has group of world access)

@jschank
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jschank commented Aug 12, 2017

I get the following when I attempt to use this:

chgrp: /Library/Caches/Homebrew: No such file or directory
chmod: /Library/Caches/Homebrew: No such file or directory
chgrp: /opt/homebrew-cask: No such file or directory
chmod: /opt/homebrew-cask: No such file or directory

Should the script create these directories, if they don't exist, so that they get created with the right permissions, when they get created by homebrew (assuming they get created by homebrew) or will the chgrp do the right thing if the directories get created later?

@ismdcf
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ismdcf commented Nov 21, 2017

Thanks was really helpful

@francos
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francos commented Dec 3, 2017

In MacOS High Sierra you can't change the owner, group or permissions of /usr/local so you have to use /usr/local/*. You might want to update the script to reflect this.

@BaljitKarwal
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BaljitKarwal commented Apr 16, 2018

@FrancoSabadini Thanks, /usr/local/* helped.

@AlJohri
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AlJohri commented May 7, 2018

Unsure why the * didn't fully work for me, but I needed to also run this for High Sierra.

chgrp -R admin /usr/local/var
chmod -R g+w /usr/local/var

@AlJohri
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AlJohri commented May 13, 2018

Down the line, I also needed to run:

chgrp -R admin /usr/local/Homebrew
chmod -R g+w /usr/local/Homebrew

maybe the permissions keep resetting themselves somehow? unsure. I was unable to run brew update because permission was denied to the .git directory until I ran the above command.

@AlJohri
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AlJohri commented May 13, 2018

Another one. I needed to do the same for /usr/local/etc:

$ brew upgrade imagemagick                                             
==> Upgrading 1 outdated package, with result:
imagemagick 7.0.7-30 -> 7.0.7-31
==> Upgrading imagemagick
Error: Permission denied @ unlink_internal - /usr/local/etc/ImageMagick-7/coder.xml

@coderxx
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coderxx commented Jul 22, 2018

Can't we just create a separate group like brew users or the like and add all users to this. Then change the ownership of these folders to that group?

@simplenotezy
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simplenotezy commented Sep 10, 2018

@coderxx this is exactly what I've done. Great thinking 🤓

@danstreeter
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danstreeter commented Jan 10, 2019

Worked great, thanks.

@alexcroox
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alexcroox commented Apr 25, 2019

This worked perfectly for me with multiple users on the same machine

https://medium.com/@leifhanack/homebrew-multi-user-setup-e10cb5849d59

@degrootestad
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degrootestad commented Feb 17, 2020

In MacOS High Sierra you can't change the owner, group or permissions of /usr/local so you have to use /usr/local/*. You might want to update the script to reflect this.

Tnx, very 'insightful'

@Blackjacx
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Blackjacx commented Aug 23, 2021

All of this doesn't work on macOS BigSur. Only the user who installed all the Homebrew stuff is able to upgrade them afterwards. For all the other users the system complains with Operation not permitted since th folder belongs to the other user. It seems like Homebrew does not respect the groups write permission and only looks for the user... :(

@cafca
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cafca commented Aug 30, 2021

@Blackjacx I am on Big Sur and this is mostly working for me, but I have to reset permissions every now and then after upgrading.

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