#!/bin/sh

set_sysctl(){
  # Set sysctl value(s) and persist them to /etc/sysctl.conf.
  # $1..$N = sysctl values (as "name=value" strings)
  # The '|' character is unsupported within the sysctl value.
  while [ $# -gt 0 ]; do
    sysctl "$1"
    sed -i.bak "/^${1%%=*}=/{
h
s|=.*|=${1#*=}|
}
\${
x
/^\$/{
s||${1}|
H
}
x
}" /etc/sysctl.conf
    shift
  done
  rm -f /etc/sysctl.conf.bak
}

set_loader_conf(){
  # Set the FreeBSD bootloader options in /boot/loader.conf.
  # The host will be rebooted if the file is changed.
  # $1..$N = bootloader options (as "name=value" strings)
  # The '|' character is unsupported within the option value.
  [ "$BOXCONF_OS" = freebsd ] || bug 'set_loader_conf can only be used on FreeBSD'

  while [ $# -gt 0 ]; do
    grep -qxF "${1%%=*}=\"${1#*=}\"" /boot/loader.conf || BOXCONF_NEED_REBOOT=true
    sed -i.bak "/^${1%%=*}=/{
h
s|=.*|=\"${1#*=}\"|
}
\${
x
/^\$/{
s||${1%%=*}=\"${1#*=}\"|
H
}
x
}" /boot/loader.conf
    shift
  done
  rm -f /boot/loader.conf.bak
}

load_kernel_module(){
  # Ensure the given kernel modules are loaded.
  # $1..$N = module names
  case $BOXCONF_OS in
    freebsd)
      while [ $# -gt 0 ]; do
        kldstat -qn "$1" || kldload -v "$1"
        shift
      done
      ;;
    *)
      die "load_kernel_module unimplemented for ${BOXCONF_OS}"
      ;;
  esac
}