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_bc_user=bitcoin
_bc_group=bitcoin

post_install() {
  _mkuser
  chown -R $_bc_user:$_bc_group /etc/bitcoin /srv/bitcoin
  printf "%b\n" "$bitcoin"
}

post_upgrade() {
  _mkuser
  chown -R $_bc_user:$_bc_group /etc/bitcoin /srv/bitcoin
  printf "%b\n" "$bitcoin"
}

post_remove() {
  _rmuser
  rm -rf /srv/bitcoin
}

_mkuser() {
  getent passwd $_bc_user &>/dev/null || {
    echo -n "Creating bitcoin user... "
    grep -E "^$_bc_group:" /etc/group >/dev/null || groupadd $_bc_group
    useradd -m -d /etc/bitcoin -g $_bc_group -s /usr/bin/nologin $_bc_user 2>/dev/null
    echo "done"
  }
}

_rmuser() {
  echo -n "Removing bitcoin user... "
  userdel -rf $_bc_user 2>/dev/null
  echo "done"
}

read -d '' bitcoin <<'EOF'
########################################################################
########################################################################
##                                                                    ##
##  Bitcoin Core                                                      ##
##  ____________                                                      ##
##                                                                    ##
##  To start bitcoin-core:                                            ##
##                                                                    ##
##      # systemctl start bitcoin                                     ##
##                                                                    ##
##  To communicate with bitcoin-core as a normal user:                ##
##                                                                    ##
##      $ mkdir -p ~/.bitcoin                                         ##
##      $ cat > ~/.bitcoin/bitcoin.conf <<'EOF'                       ##
##      rpcconnect=127.0.0.1                                          ##
##      rpcport=8332                                                  ##
##      rpcuser=bitcoin                                               ##
##      rpcpassword=secret                                            ##
##      EOF                                                           ##
##                                                                    ##
##      $ bitcoin-cli getmininginfo                                   ##
##                                                                    ##
##  Config:        /etc/bitcoin/bitcoin.conf                          ##
##  Blockchain:    /srv/bitcoin                                       ##
##  Documentation: /usr/share/doc/bitcoin                             ##
##                                                                    ##
########################################################################
########################################################################
EOF