110 lines
2.5 KiB
Bash
110 lines
2.5 KiB
Bash
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#!/bin/bash
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# This script checks for a new version of BasicAircraftLookup from
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# the VRS website and, if one is available, downloads it and updates
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# the dump1090 webmap json files.
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set -e
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# defaults that can be overridden:
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VRS_URL=${VRS_URL:-http://www.virtualradarserver.co.uk/Files/BasicAircraftLookup.sqb.gz}
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CACHEDIR=${CACHEDIR:-/var/cache/dump1090-mutability}
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JSONDIR=${JSONDIR:-$CACHEDIR/db}
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SQBDIR=${SQBDIR:-$CACHEDIR/sqb}
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LOGFILE=${LOGFILE:-/var/log/dump1090-mutability.log}
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UPDATESCRIPT=${UPDATESCRIPT:-/usr/share/dump1090-mutability/vrs-basicaircraft-to-json.py}
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if [ -f /etc/default/dump1090-mutability ]
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then
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. /etc/default/dump1090-mutability
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fi
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ETAGFILE=$SQBDIR/BasicAircraftLookup.sqb.etag
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SQBFILE=$SQBDIR/BasicAircraftLookup.sqb
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CHECKMODIFIED=true
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LOGTOFILE=false
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while [ "$#" -gt 0 ]
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do
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case "$1" in
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-f|--force) CHECKMODIFIED=false ;;
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-l|--log-to-file) LOGTOFILE=true ;;
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*) echo "unrecognized option: $1" >&2; exit 1 ;;
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esac
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shift
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done
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if $LOGTOFILE; then exec >>$LOGFILE 2>&1; fi
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log() {
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date "+%c $*" >&2
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}
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mkdir -p $CACHEDIR $JSONDIR $SQBDIR
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rm -f $ETAGFILE.new $SQBFILE.new
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log "Checking VRS server for an updated database.."
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# get ETag
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curl --silent --fail --include --head $VRS_URL | grep ETag >$ETAGFILE.new
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# check for existing file
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RETRIEVE=true
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ARGS=""
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if $CHECKMODIFIED && [ -f $SQBFILE ]
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then
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if [ -s $ETAGFILE -a -s $ETAGFILE.new ]
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then
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if cmp -s $ETAGFILE $ETAGFILE.new
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then
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log "Database not modified."
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RETRIEVE=false
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else
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log "Database modified, will retrieve a new copy."
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fi
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else
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# do an if-modified-since
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log "Database possibly modified, will try to retrieve a new copy."
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ARGS="-z $SQBFILE"
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fi
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fi
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if $RETRIEVE
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then
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log "Retrieving database.."
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curl --silent --fail --remote-time --retry 2 $ARGS -o $SQBFILE.new $VRS_URL
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mv $ETAGFILE.new $ETAGFILE
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if [ -f $SQBFILE.new ]
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then
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log "Decompressing database.."
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zcat $SQBFILE.new >$SQBFILE
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touch -r $SQBFILE.new $SQBFILE
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rm $SQBFILE.new
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else
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log "Database not modified."
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fi
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fi
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UPDATE=true
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if $CHECKMODIFIED
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then
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if test -f $JSONDIR/last_update; then
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if ! test $SQBFILE -nt $JSONDIR/last_update; then UPDATE=false; fi
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fi
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fi
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if $UPDATE
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then
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log "Updating JSON files from database.."
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mkdir -p $JSONDIR/new
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$UPDATESCRIPT $SQBFILE $JSONDIR/new
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rm -f $JSONDIR/*.json
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mv $JSONDIR/new/*.json $JSONDIR/
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touch -r $SQBFILE $JSONDIR/last_update
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rmdir $JSONDIR/new
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log "Done."
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else
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log "No update to JSON files needed."
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fi
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