43 lines
1.6 KiB
Shell
43 lines
1.6 KiB
Shell
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#!/bin/sh
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# Keeps the instance's own map tiles current (Halkyon Train's ADR 0030, D50): the
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# newest of Protomaps' daily builds of the planet, cut to MAP_REGION (`west,south,
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# east,north` in degrees; by default Europe's, the box BRouter's segments cover) at
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# zooms 0 to 15, into /tiles/europe.pmtiles; again every MAP_REFRESH_DAYS days (30)
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# where a newer build has come. The cut is written into /tiles/next/ and moved over
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# the old one, so the server never reads half a file; until it is done, the old one
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# serves. Both at once take twice a cut's room.
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set -eu
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builds=https://build-metadata.protomaps.dev/builds.json
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region=${MAP_REGION:--25,35,45,75}
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days=${MAP_REFRESH_DAYS:-30}
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cd /tiles
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mkdir -p next
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refresh() {
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build=$(curl -fsS "$builds" | grep -o '"key": *"[0-9]\{8\}\.pmtiles"' |
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grep -o '[0-9]\{8\}\.pmtiles' | sort | tail -n 1) || build=
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if [ -z "$build" ]; then
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echo "Protomaps' builds didn't come; the tiles stay as they are." >&2
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return 0
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fi
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if [ -e europe.build ] && [ "$(cat europe.build)" = "$build" ]; then
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echo "The tiles are $build's, the newest."
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return 0
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fi
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rm -f next/europe.pmtiles
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if pmtiles extract "https://build.protomaps.com/$build" next/europe.pmtiles \
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--bbox="$region" --maxzoom=15 --download-threads=4; then
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mv next/europe.pmtiles europe.pmtiles
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echo "$build" >europe.build
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echo "The tiles are $build's now, $(du -h europe.pmtiles | cut -f1)."
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else
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rm -f next/europe.pmtiles
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echo "The cut of $build failed; the tiles stay as they are." >&2
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fi
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}
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while :; do
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refresh
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sleep $((days * 86400))
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done
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