add-user.sh

#!/usr/bin/env bash
set -e
set -x

NEWUSER="${1}"
NEWHOME="/home/${NEWUSER}"
NEWGROUPS=""
if [ $(ls -1 /home/ | wc -l) -eq 0 ]; then
  # first user can be a super user
  NEWGROUPS="-G adm,cdrom,dip,lpadmin,plugdev,sambashare,docker,sudo"
  OUTFILE="/etc/sudoers.d/${NEWUSER}"
  if [ ! -f ${OUTFILE} ]; then
    cat >${OUTFILE} <<EOF
## Uncomment the line below to allow sudo without password
## THIS IS NOT RECOMMENDED!
#
#${NEWUSER} ALL=(ALL) NOPASSWD: ALL
EOF
    chmod o-rwx ${OUTFILE}
  fi
fi
NEWSKEL="/etc/skel"

# password is admin
useradd -d ${NEWHOME} ${NEWGROUPS} -m -k ${NEWSKEL} -p '$6$ZukFU3LL$jGgdl2h6oSt/j06odeBaTPyWCwobck.GQA1DJVwEmYkji1DMDMj3WA66dCBpCer5hpavx8ArScr5lLvS4VXMg/' -s /bin/bash -U ${NEWUSER}

#usermod -a -G ${NEWGROUPS} ${NEWUSER}

install -d -m 700 -o ${NEWUSER} -g ${NEWUSER} ${NEWHOME}/.vim
install -d -m 700 -o ${NEWUSER} -g ${NEWUSER} ${NEWHOME}/.vim/backups
install -d -m 700 -o ${NEWUSER} -g ${NEWUSER} ${NEWHOME}/.vim/swaps
install -d -m 700 -o ${NEWUSER} -g ${NEWUSER} ${NEWHOME}/.vim/undo

mv ${NEWHOME} ${NEWHOME}.original
zfs create system${NEWHOME}
chown -R ${NEWUSER}:${NEWUSER} ${NEWHOME}
find ${NEWHOME}.original -maxdepth 1 -mindepth 1 -exec mv {} ${NEWHOME} \;
rmdir ${NEWHOME}.original

if [ -d /root/ubuntu-zfs/skel ]; then
  for i in /root/ubuntu-zfs/skel/.* /root/ubuntu-zfs/skel/*; do
    case ${i##*/} in
      . | ..)
        echo "Skipping ${i##*/}"
        ;;
      *)
        OUTFILE="${NEWHOME}/${i##*/}"
        [ -f ${OUTFILE} -a ! -f ${OUTFILE}.original ] && cp -a ${OUTFILE} ${OUTFILE}.original
        [ -f ${i} ] && install -m 600 -o ${NEWUSER} -g ${NEWUSER} ${i} ${OUTFILE}
        if [ -d ${i} ]; then
          cp -a ${i} ${NEWHOME}
          chown -R ${NEWUSER}:${NEWUSER} ${OUTFILE}
          # remove group and other permissions
          find ${OUTFILE} -exec chmod go-rwx {} \;
        fi
        ;;
    esac
  done
fi

if [ -e /root/.apt-cache ]; then
  mv /root/.apt-cache ${NEWHOME}/.apt-cache
  chown -R ${NEWUSER}:${NEWUSER} ${NEWHOME}/.apt-cache
fi