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When we run brew install --cask i am getting this error

sudo: unknown user: brew

sudo: error initializing audit plugin sudoers_audit

Error: Running Homebrew as root is extremely dangerous and no longer supported.

As Homebrew does not drop privileges on installation you would be giving all

build scripts full access to your system.

 

I think this does what you need it to do, I'd advise changin some of the variable to utilize something other than python commands to obtain user, etc but yeah, I think this is what you're looking for.

 

#!/bin/bash

# Script to install Homebrew on a Mac.
# Author: richard at richard - purves dot com
# Version: 1.0 - 21st May 2017

# Set up variables and functions here
consoleuser="$(python -c 'from SystemConfiguration import SCDynamicStoreCopyConsoleUser; import sys; username = (SCDynamicStoreCopyConsoleUser(None, None, None) or [None])[0]; username = [username,""][username in [u"loginwindow", None, u""]]; sys.stdout.write(username + "
");')"
brandid="com.application.id"
tn="/path/to/terminal-notifier.app/Contents/MacOS/terminal-notifier"
cd="/path/to/cocoaDialog.app/Contents/MacOS/cocoaDialog"

# Logging stuff starts here
LOGFOLDER="/private/var/log/"
LOG=$LOGFOLDER"Homebrew.log"

if [ ! -d "$LOGFOLDER" ];
then
mkdir $LOGFOLDER
fi

function logme()
{
# Check to see if function has been called correctly
if [ -z "$1" ]
then
echo $( date )" - logme function call error: no text passed to function! Please recheck code!"
echo $( date )" - logme function call error: no text passed to function! Please recheck code!" >> $LOG
exit 1
fi

# Log the passed details
echo -e $( date )" - $1" >> $LOG
echo -e $( date )" - $1"
}

function notify()
{
su -l "$consoleuser" -c " "'"'$tn'"'" -sender "'"'$brandid'"'" -title "'"'$title'"'" -message "'"'$1'"'" "
logme "$1"
}

# Check and start logging - done twice for local log and for JAMF
logme "Homebrew Installation"

# Let's start here by caffinating the mac so it stays awake or bad things happen.
caffeinate -d -i -m -u &
caffeinatepid=$!
logme "Caffinating the mac under process id: $caffeinatepid"

# Have the xcode command line tools been installed?
notify "Checking for Xcode Command Line Tools installation"
check=$( pkgutil --pkgs | grep com.apple.pkg.CLTools_Executables | wc -l | awk '{ print $1 }' )

if [[ "$check" != 1 ]];
then
notify "Installing Xcode Command Tools"
# This temporary file prompts the 'softwareupdate' utility to list the Command Line Tools
touch /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
clt=$(softwareupdate -l | grep -B 1 -E "Command Line (Developer|Tools)" | awk -F"*" '/^ +\\*/ {print $2}' | sed 's/^ *//' | tail -n1)
softwareupdate -i "$clt"
rm -f /tmp/.com.apple.dt.CommandLineTools.installondemand.in-progress
/usr/bin/xcode-select --switch /Library/Developer/CommandLineTools
fi

# Is homebrew already installed?
which -s brew
if [[ $? = 1 ]];
then
# Install Homebrew. This doesn't like being run as root so we must do this manually.
notify "Installing Homebrew"

# Curl down the latest tarball and install to /usr/local
curl -L https://github.com/Homebrew/brew/tarball/master | tar xz --strip 1 -C /usr/local

# Manually make all the appropriate directories and set permissions
mkdir -p /usr/local/Cellar /usr/local/Homebrew /usr/local/Frameworks /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/opt /usr/local/sbin /usr/local/share /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var
chown -R $consoleuser /usr/local
chmod g+rwx /usr/local/Cellar /usr/local/Homebrew /usr/local/Frameworks /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/opt /usr/local/sbin /usr/local/share /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var
chmod 755 /usr/local/share/zsh /usr/local/share/zsh/site-functions
chgrp admin /usr/local/Cellar /usr/local/Homebrew /usr/local/Frameworks /usr/local/bin /usr/local/etc /usr/local/include /usr/local/lib /usr/local/opt /usr/local/sbin /usr/local/share /usr/local/share/zsh /usr/local/share/zsh/site-functions /usr/local/var

# Create a system wide cache folder
mkdir -p /Library/Caches/Homebrew
chmod g+rwx /Library/Caches/Homebrew
chown $consoleuser:wheel /Library/Caches/Homebrew

# Install the MD5 checker or the recipes will fail
su -l "$consoleuser" -c "/usr/local/bin/brew install md5sha1sum"
su -l "$consoleuser" -c "echo "'"export PATH=/usr/local/opt/openssl/bin:$PATH"'" >> ~/.bash_profile"

# Remove temporary folder
rm -rf /usr/local/Homebrew
else
# Run an update and quit
notify "Updating Homebrew"
su -l "$consoleuser" -c "/usr/local/bin/brew update" 2>&1 | tee -a ${LOG}
exit 0
fi

# Make sure everything is up to date
notify "Updating Homebrew"
su -l "$consoleuser" -c "/usr/local/bin/brew update" 2>&1 | tee -a ${LOG}

# Notify user that all is completed
notify "Installation complete"

# No more caffeine please. I've a headache.
kill "$caffeinatepid"

exit 0

 

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