post_install() {
  local pkgver=$1
  odbcinst -v -q -d -n "ODBC Driver ${pkgver%%.*} for SQL Server" >/dev/null || \
    odbcinst -i -d -f opt/microsoft/msodbcsql/etc/odbcinst.ini
}

post_upgrade() {
  local newver=$1
  local oldver=$2

  pre_remove "$oldver"
  post_install "$newver"
}

pre_remove() {
  local pkgver=$1
  odbcinst -v -u -d -n "ODBC Driver ${pkgver%%.*} for SQL Server" >/dev/null
}