xe-update-stats

#!/bin/sh
#
# add to /etc/rc.local
# [ -x /usr/local/bin/xe-update-stats ] && /usr/local/bin/xe-update-stats init

# add to `crontab -e`
# 1-59    *       *       *       *       /bin/sh /usr/local/bin/xe-update-stats

# Get actual pvbus driver - sometimes there are two.
pvdev=""
for pvbus in $(echo /dev/pvbus*); do
	type="$(hostctl -qtf "$pvbus" | cut -d: -f2 | tr -d ' ')"
	if [ "$type" = "Xen" ]; then
		pvdev=$pvbus
	fi
done

if [ "$pvdev" = "" ]; then
	echo "Unable to communicate with Xen dom0: no appropriate pvbus device found."
	exit 1
fi

invocation="hostctl -f $pvdev"

if [ "$1" = "init" ]; then

  ostype=$(sysctl -n kern.ostype)
  osrelease=$(sysctl -n kern.osrelease)

  # XenServer Tools version
  $invocation attr/PVAddons/MajorVersion 6
  $invocation attr/PVAddons/MinorVersion 2
  $invocation attr/PVAddons/MicroVersion 0
  $invocation attr/PVAddons/BuildVersion 76888
  $invocation attr/PVAddons/Installed 1

  for ifline in $(dmesg | grep address | sed -E -e 's/^(xnf.+)\ at.*address\ ([a-fA-F0-9:]+)/\1=\2/' | sort); do
    mac="$(echo "$ifline" | cut -d= -f2)"
    if="$(echo "$ifline" | cut -d= -f1)"
    for vif in $($invocation device/vif); do
      if [ "$mac" = "$($invocation device/vif/"$vif"/mac)" ]; then
        ip4="$(ifconfig "$if" | grep 'inet[^6]' | cut -d ' ' -f2)"
        ip6="$(ifconfig "$if" | grep 'inet6' | cut -d ' ' -f2 | cut -d% -f1)"
        if [ -n "$ip4" ]; then
          $invocation attr/eth"$vif"/ip "$ip4"
        fi
        if [ -n "$ip6" ]; then
          $invocation attr/eth"$vif"/ipv6/0/addr "$ip6"
        fi
      fi
    done
  done

  # OS version
  $invocation data/os_name "$ostype $osrelease"
  $invocation data/os_uname "$osrelease"
  $invocation data/os_distro "$ostype"
  $invocation data/os_majorver "$(echo "$osrelease" | sed -e 's/\..*$//')"
  $invocation data/os_minorver "$(echo "$osrelease" | sed -e 's/^.*\.//')"

  # Update XenStore
  $invocation data/updated 1

fi

$invocation data/meminfo_total "$(vmstat -s | awk -v pagesize="$(/sbin/sysctl -n hw.pagesize)" '/pages managed$/ { print $1 * pagesize / 1024 }')"

$invocation data/meminfo_free "$(vmstat -s | awk -v pagesize="$(/sbin/sysctl -n hw.pagesize)" '/pages free$/ { print $1 * pagesize / 1024 }')"

This script has been modified to pass all shellcheck warnings (even though as far as I can tell there's zero chance of one being relevant) and actually look for the correct pvbus device because I've got a VM that also has a HyperV one for some reason on 7.7. A nice extra is that it will now bounce out with a meaningful error if run on something that's not OpenBSD.