rstudio multi-user helper

build_logins.sh

#!/bin/bash

# Start an AWS instance with one of the AMIs provided by:
#  http://www.louisaslett.com/RStudio_AMI/
#
# Get this script.
# wget https://gist.githubusercontent.com/JoshData/615aa18cecb8a6596f59/raw/1b43765552862af98cb16d95dd236a81f6c5b464/build_logins.sh
# chmod +x build_logins.sh
#
# Then use this script to create many logins on the system.
#
#  sudo ./build_logins.sh 50
#
# * This creates 50 users named user1, user2, ...
# * The passwords are the same as the user names.
# * The home directory of each is set to /mnt/$user, so you can put
#   them on a large volume, and each is initialized with a copy of the
#   "rstudio" user's home directory, so you can login as rstudio (pw: rstudio)
# first, get it set up how you want, and then run this script to create clones.
#
# Running the script again trashes all of those users and regenerates new ones.

# stop rstudio because it runs instances as the users we are trying to delete
rstudio-server stop
sleep 1 # might take time to release

# clear out any previously generated logins
existing_users=$(grep ^user /etc/passwd | sed 's/:.*//')
if [ ! -z "$existing_users" ]; then
        for user in $existing_users; do
                deluser --remove-home $user > /dev/null
        done
fi

# make new ones, specify the count on the comand line!
for id in $(seq 1 $1); do
	userhome=/mnt/user$id
        adduser \
		--gid 1001 \
		--home $userhome \
		--no-create-home \
		--quiet --gecos "" \
		--shell /bin/false \
		--disabled-password \
		user$id < /dev/null
        cp -a /home/rstudio $userhome
        chown -R user$id $userhome
        echo "user$id:user$id" | chpasswd
done

# start again
rstudio-server start