latest_checkpoint.lib #2

# Function to get latest checkpoint MD5 by journal number
get_latest_checkpoint_md5() {
    local checkpoint_dir="$1"
    local latest_md5=""
    local max_journal=0
    
    # Use glob with nullglob to handle no matches gracefully
    shopt -s nullglob
    for md5_file in "${checkpoint_dir}"/checkpoint*.md5; do
        # Extract journal number from filename
        if [[ $(basename "$md5_file") =~ checkpoint\.ckp\.([0-9]+)\.md5$ ]]; then
            journal_num="${BASH_REMATCH[1]}"
            # Remove leading zeros for numeric comparison
            journal_num=$((10#$journal_num))
            
            if (( journal_num > max_journal )); then
                max_journal=$journal_num
                latest_md5="$md5_file"
            fi
        fi
    done
    shopt -u nullglob
    
    echo "$latest_md5"
}

# Sample Usage:
# LatestCheckpointMD5=$(get_latest_checkpoint_md5 "${ShowCheckpoints[i]}")