#!/bin/sh
set -e

# Do nothing if the script already ran.
# The pre_install step can be run multiple times.
[ -e /usr/bin/update-alternatives.orig ] && exit 0

dpkg-divert --divert /usr/bin/update-alternatives.orig --rename /usr/bin/update-alternatives
cat >/usr/bin/update-alternatives <<'EOT'
#!/bin/sh
echo "LOG-ALTERNATIVES: dpkg=${DPKG_MAINTSCRIPT_PACKAGE}: piuparts=${PIUPARTS_OBJECTS}: $0 $@" >>/tmp/log-alternatives.log
exec /usr/bin/update-alternatives.orig "$@"
EOT
chmod +x /usr/bin/update-alternatives