#! /bin/sh
# postinst script for stackdriver-agent
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

. /usr/share/debconf/confmodule

case "$1" in
    configure)
      # Check if the application default credentials file is in the system
      # location.
      if [ ! -f /etc/google/auth/application_default_credentials.json ]; then
          # See if the instance has the correct monitoring scopes.
          INSTANCE_SCOPES=$(curl --silent --connect-timeout 1 -f -H "Metadata-Flavor: Google" http://169.254.169.254/computeMetadata/v1/instance/service-accounts/default/scopes 2>/dev/null || /bin/true)
          if [ `echo "$INSTANCE_SCOPES" | grep -cE '(monitoring.write|monitoring|cloud-platform)$'` -lt 1 ]; then
              echo >&2 "The instance has neither the application default" \
                "credentials file nor the correct monitoring scopes;" \
                "The agent will likely fail."
          fi
      fi
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

db_stop

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

# Automatically added by dh_installinit
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ]; then
	if [ -x "/etc/init.d/stackdriver-agent" ]; then
		update-rc.d stackdriver-agent defaults >/dev/null
		invoke-rc.d stackdriver-agent start || exit $?
	fi
fi
# End automatically added section


exit 0