[runit] Nginx run script

#!/bin/sh

# Configuration
owner='root:root'
confdir='/etc/nginx'
logdir='/var/log/nginx'
rundir='/run/nginx'
conf='nginx.conf'

exec 2>&1

if [ ! -d $confdir ]; then
  printf 'Configuration directory %s does not exist!\n' $confdir
  exit 1
fi

# Absolute path to config
conffile="${confdir}/${conf}"

if [ ! -f $conffile ]; then
  printf 'Main nginx configuration file %s does not exist!\n' $conffile
  exit 1
fi

if [ ! -d $rundir ]; then
  printf 'Run directory %s does not exist, creating...' $rundir
  rm -rf $rundir > /dev/null
  mkdir $rundir
  echo ' [done]'
fi

if [ $(stat -c '%U:%G' $rundir) != $owner ]; then
  printf 'Run directory %s has incorrect owner, changing...' $rundir
  chown $owner $rundir
  echo ' [done]'
fi

if [ $(stat -c '%U:%G' $logdir) != $owner ]; then
  printf 'Log directory %s has incorrect owner, changing...' $logdir
  chown -R $owner $logdir
  echo ' [done]'
fi

# Checking if somebody left this instance of nginx running as a daemon.
pidfile="${rundir}/nginx.pid"
if [ -f $pidfile ]; then
  read pid <$pidfile

  if [ -n "${pid}" -a -d "/proc/${pid}" ]; then
    echo 'Nginx has been daemonized! Please adjust your config so that it includes a \"daemon off;\" line.'
    exit 10
  fi
fi

# Cleaning up trash from previous instance.
rm -rf "${rundir}/*" > /dev/null

# Testing nginx config before launching
conftest=$(nginx -tqc $conffile)

if [ -n "${conftest}" ]; then
  echo 'Nginx configuration test failed!'
  echo $conftest
  exit 11
else
  printf 'Successfully tested nginx configuration. Starting from %s...\n' $root
  cd $root
  exec nginx -c $conffile
fi