58 lines
1.9 KiB
Shell
58 lines
1.9 KiB
Shell
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#!/bin/sh
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# Keeps BRouter's segments of the operator's region current (ADR 0030, D11, D44):
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# every 5°×5° segment of BRouter's project whose south-west corner lies in
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# BROUTER_REGION (`west,south,east,north` in whole degrees, multiples of 5; Europe's
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# `-25,35,40,70` by default), downloaded where the project has a newer one than the
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# volume holds, then again every BROUTER_REFRESH_DAYS days (30). Each is written beside
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# its old self and moved over it, so BRouter never reads half a file. Segments of
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# the sea, which the project doesn't have, are skipped.
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set -eu
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base=https://brouter.de/brouter/segments4
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region=${BROUTER_REGION:--25,35,40,70}
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days=${BROUTER_REFRESH_DAYS:-30}
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cd /segments4
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IFS=, read -r west south east north <<END
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$region
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END
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name() {
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lon=$1 lat=$2
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if [ "$lon" -lt 0 ]; then ew="W$((-lon))"; else ew="E$lon"; fi
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if [ "$lat" -lt 0 ]; then ns="S$((-lat))"; else ns="N$lat"; fi
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echo "${ew}_${ns}.rd5"
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}
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refresh() {
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listing=$(curl -fsS "$base/") || { echo "The segments' listing didn't come." >&2; return 0; }
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fetched=0 kept=0
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lon=$west
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while [ "$lon" -le "$east" ]; do
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lat=$south
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while [ "$lat" -le "$north" ]; do
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file=$(name "$lon" "$lat")
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if echo "$listing" | grep -q "href=\"$file\""; then
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# Only where the project's is newer than ours (If-Modified-Since): a
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# current one comes back empty.
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if [ -e "$file" ]; then set -- -z "$file"; else set --; fi
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if curl -fsS -R --retry 3 "$@" -o "$file.part" "$base/$file" &&
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[ -s "$file.part" ]; then
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mv "$file.part" "$file"
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fetched=$((fetched + 1))
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else
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rm -f "$file.part"
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kept=$((kept + 1))
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fi
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fi
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lat=$((lat + 5))
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done
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lon=$((lon + 5))
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done
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echo "Segments: $fetched fetched, $kept current, $(du -sh . | cut -f1) in all."
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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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