message: Chgrp config dir to bitcoin in systemd service
  Rather than making the config dir world-readable, which potentially
  leaks RPC credentials, the group of the directory is changed to the one
  the service is executed as.
diff: @@ -19,6 +19,10 @@ ExecStart=/usr/bin/bitcoind -daemon \
  -conf=/etc/bitcoin/bitcoin.conf \
  -datadir=/var/lib/bitcoind
  +# Make sure the config directory is readable by the service user
  +PermissionsStartOnly=true
  +ExecStartPre=/bin/chgrp bitcoin /etc/bitcoin
  +
  # Process management
  ####################
  