message: guix: Check for a sane services database
  On bare systems, it is possible to be lacking a services database. Check
  for basic entries before attempting a build.
  See the error message in the diff for more context.
diff: @@ -18,7 +18,7 @@ source "$(dirname "${BASH_SOURCE[0]}")/libexec/prelude.bash"
  # Required non-builtin commands should be invocable
  ################
  -check_tools cat mkdir make git guix
  +check_tools cat mkdir make getent git guix
  ################
  # GUIX_BUILD_OPTIONS should be empty
  @@ -186,6 +186,29 @@ fi
  #
  # However, the internal API is likely to change more than the CLI invocation
  +################
  +# Services database must have basic entries
  +################
  +
  +if ! getent services http https ftp; then
  +cat << EOF
  +ERR: Your system's C library can not find service database entries for at least
  + one of the following services: http, https, ftp.
  +
  +Hint: Most likely, /etc/services does not exist yet (common for docker images
  + and minimal distros), or you don't have permissions to access it.
  +
  + If /etc/services does not exist yet, you may want to install the
  + appropriate package for your distro which provides it.
  +
  + On Debian/Ubuntu: netbase
  + On Arch Linux: iana-etc
  +
  + For more information, see: getent(1), services(5)
  +
  +EOF
  +
  +fi
  #########
  # SETUP #
  