generage-ubuntu-csv-entry.sh

#!/bin/bash

set -e

CSV=/usr/share/distro-info/ubuntu.csv

if [[ $# != 1 ]]; then
  echo "Usage:   $0 <series>"
  echo "Example: $0 <jammy>"
  exit 1
fi

generate_csv_entry_for_series() {
  # Read latest entry into an array
  mapfile -d, -t latest < <(tail -n1 $CSV | tr -d '\n')

  new_series=$1
  new_codename="${new_series^}"
  new_codename="${new_codename} ${new_codename:0:1}ANIMAL"
  new_created=${latest[4]}
  new_release=$(date '+%Y-%m-%d' --date="$new_created + 26 week")
  new_eol=$(date '+%Y-%m-%d' --date="$new_release + 39 week")

  new_version=$(date '+%y.%m' --date="$new_release")
  new_version_year=${new_version:0:2}
  new_version_month=${new_version:3:5}
  ((new_version_year % 2 == 0 && new_version_month == 4)) && new_version="$new_version LTS"

  echo "$new_version,$new_codename,$new_series,$new_created,$new_release,$new_eol"
}

generate_csv_entry_for_series "$1"

The EOL date will be wrong for LTS releases, but we don't care: this is a temporary hack for the very first days after a new cycle opens.