minideb/snapshot

#!/bin/bash

set -e
set -u
set -o pipefail

snapshot_list_tmp_dir=$(mktemp -d)
mkdir -p "${snapshot_list_tmp_dir}"

get_latest_month_query(){
    snapshot_archive_tmp_file="${snapshot_list_tmp_dir}/archive.html"

    ! curl -sSfL "https://snapshot.debian.org/archive/debian/" > "$snapshot_archive_tmp_file" && echo "Error when accessing https://snapshot.debian.org/archive/debian/" && return 1

    month_query=$(grep -Po "(\?year=\d\d\d\d&month=\d+)" "${snapshot_archive_tmp_file}" | tail -1)

    [[ -z "$month_query" ]] && echo "Not found snapshots using the following regex: (?year=\d\d\d\d&month=\d+)" && return 1

    echo "$month_query" && return 0
}

get_latest_debian_snapshot_id() {
    ! month_query=$(get_latest_month_query) && return 1

    snapshot_list_tmp_file="${snapshot_list_tmp_dir}/month-snapshots.html"

    ! curl -sSfL "https://snapshot.debian.org/archive/debian/$month_query" > "$snapshot_list_tmp_file" && echo "Not found snapshots for these parameters: query=${month_query}" && return 1

    snapshot_id=$(grep -Po "(\d+T.*Z)" "${snapshot_list_tmp_file}" | tail -1)

    [[ -z "$snapshot_id" ]] && echo "Not found snapshot id using the following regex: (\d+T.*Z)" && return 1

    mkdir -p build
    echo "$snapshot_id" > build/snapshot_id && return 0
}

get_latest_debian_snapshot_id