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#!/bin/bashset -euo pipefail# SJP 28 Nov 2021 — extended for deployment# Download BOM synoptic chart (IDY00030) and publish as PNG.# BOM permits anonymous FTP for personal use.# Charts are valid at 00, 06, 12, 18 UTC; files appear ~2h later.# Deployed to /opt/synoptic/synopticChart.sh on cremonde for pestrel.com.ARCHIVE_DIR=/var/lib/synoptic/archiveRAW_DIR=/var/lib/synoptic/archive/rawLATEST=/srv/www/pestrel/synopticLatest.pngrequire_cmd() { local cmd="$1" if ! command -v "$cmd" >/dev/null 2>&1; then echo "Required command not found: ${cmd}" >&2 exit 127 fi}require_cmd curlrequire_cmd magickrequire_cmd gs# Return the datetime string for the most recently published chart slot.# BOM chart slots: 0000, 0600, 1200, 1800 UTC.DeriveTime() { local nowDate nowTime fileTime nowDate=$(date -u +%Y%m%d) nowTime=$(date -u +%H%M) if [ "$nowTime" -ge 1800 ]; then fileTime=1800 elif [ "$nowTime" -ge 1200 ]; then fileTime=1200 elif [ "$nowTime" -ge 0600 ]; then fileTime=0600 else fileTime=0000 fi echo "${nowDate}${fileTime}"}dateTime=$(DeriveTime)latestChart="IDY00030.${dateTime}.pdf"# -q no config file lookup -f fail on error -s silentcurlExit=0curl -q -fs -o "${latestChart}" "ftp://ftp.bom.gov.au/anon/gen/fwo/${latestChart}" \ || curlExit=$?if [ "$curlExit" -gt 0 ]; then if [ "$curlExit" -eq 78 ]; then echo "No file at remote site: ${latestChart} (curl exit ${curlExit})" >&2 fi exit "$curlExit"fimagick -density 300 "${latestChart}" -resize 1920x1080 "${dateTime}.png"mv "${latestChart}" "${RAW_DIR}/"cp "${dateTime}.png" "${ARCHIVE_DIR}/"mv "${dateTime}.png" "${LATEST}"chmod 644 "${LATEST}"
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