+#!/usr/bin/env bash
+
+# FLG - Fast Lacells.db Generator
+#
+# Simple script to quickly download and generate lacells.db for LocalGSMBackend by n76
+# https://github.com/n76/Local-GSM-Backend
+# Uses Mozilla Location Service, OpenCellID and radiocells.org databases as source
+# Based on lacells-creator by wvengen and n76
+#
+# Licensed under GPLv3 or later
+# (C)2016 Sebastian Obrusiewicz
+# sobrus@o2.pl
+
+if [ -z "$IN_BUILDBOT" ]; then
+#DEFAULT_CONFIG_BEGIN
+ENABLE_OCI=1 #enable OpenCellID data source
+ENABLE_MOZ=1 #enable Mozilla Location Services (MLS) data source
+ENABLE_RCO=0 #enable radiocells.org data source (it can be quite slow)
+
+# See https://en.wikipedia.org/wiki/Mobile_country_code
+# 208 France
+MCC="" #contry codes separated with "|", for example "260|262". Leave dot+asterisk ".*" for all countries
+RCO_SRC_FILE="fr.sqlite" #radiocells.org source database file, set "openbmap.sqlite" for entire world database, see https://radiocells.org/downloads for smaller country specific files, for example "pl.sqlite" for Poland
+RADIO="" #you can remove LTE if your phone does not support it
+TOKEN="" #your OCID token, required to download from OpenCellID. Get your free token at https://opencellid.org/
+fi
+TMPDIR='.' #for temporary files only, use disk if you don't have enough RAM, AND remember to have enough disk space in /var/tmp for sqlite temporary files
+KEEP_FILES=1 #whether to keep (1) or delete (0) the CSV files after processing
+
+#do not edit following variables, unless you know what you're doing
+EMPTY=',,,,,,,,,,,,,' #dummy empty file for disabled sources
+OCI_FILE=$TMPDIR"/ocid.csv" #opencellid temporary file
+MOZ_FILE=$TMPDIR"/mozilla.csv" #mozilla temporary file
+RCO_FILE=$TMPDIR"/rco.csv" #radiocells.org temporary file
+#DEFAULT_CONFIG_END
+
+#USER_CONFIG_BEGIN
+BINDIR=$( dirname "$(readlink -f "$0")" ) #"
+if [[ -f "${BINDIR}/config" ]]; then
+ . "${BINDIR}/config"
+fi
+#USER_CONFIG_END
+
+function manage_backup
+{
+ file=$1
+ if [ -s $file ]
+ then
+ if [ $KEEP_FILES == "1" ]
+ then
+ gzip -kf $file
+ fi
+ elif [ -s $file".gz" ] && [ "${file##*.}" == "csv" ]
+ then
+ echo "Using" $file".gz backup file"
+ gzip -dkf $file".gz"
+ fi
+}
+
+
+function download_ocid
+{
+ URL="https://opencellid.org/ocid/downloads?token=${TOKEN}&type=full&file=cell_towers.csv.gz"
+ if [ $ENABLE_OCI == "1" ]
+ then
+ wget -qO- "$URL" | gunzip | egrep "^($RADIO),($MCC)," > $OCI_FILE
+ manage_backup $OCI_FILE
+ else
+ echo $EMPTY > $OCI_FILE
+ fi
+}
+
+function download_mozilla
+{
+ if [ $ENABLE_MOZ == "1" ]
+ then
+ NW=`date -u "+%Y-%m-%d"`
+ wget -qO- "https://d17pt8qph6ncyq.cloudfront.net/export/MLS-full-cell-export-${NW}T000000.csv.gz" | gunzip | egrep "^($RADIO),($MCC)," > $MOZ_FILE
+ manage_backup $MOZ_FILE
+ else
+ echo $EMPTY > $MOZ_FILE
+ fi
+}
+
+function download_radiocells
+{
+ if [ $ENABLE_RCO == "1" ]
+ then
+ RCO_SELECT="SELECT technology, mcc, mnc, area, cid, NULL, longitude, latitude, 1000 accuracy, measurements, NULL, NULL, NULL, NULL FROM cell_zone;"
+ wget -qO- "https://cdn.radiocells.org/"$RCO_SRC_FILE > $TMPDIR"/"$RCO_SRC_FILE
+ sqlite3 -header -csv $TMPDIR"/"$RCO_SRC_FILE "$RCO_SELECT" | egrep "^($RADIO),($MCC)," > $RCO_FILE
+ rm $TMPDIR"/"$RCO_SRC_FILE
+ manage_backup $RCO_FILE
+ else
+ echo $EMPTY > $RCO_FILE
+ fi
+}
+
+echo "Downloading data"
+
+download_ocid &
+OP=$!
+download_mozilla &
+MO=$!
+download_radiocells &
+RO=$!
+
+wait $OP
+wait $MO
+wait $RO
+
+if [ -s $MOZ_FILE ] && [ -s $OCI_FILE ] && [ -s $RCO_FILE ]
+then
+
+manage_backup lacells.db
+rm lacells.db
+
+echo "Generating database"
+
+sqlite3 lacells.db <<-SQL
+PRAGMA synchronous = OFF;
+PRAGMA journal_mode = OFF;
+
+CREATE TEMP TABLE cells_import (radio TEXT,mcc INTEGER,mnc INTEGER,lac INTEGER,cid INTEGER,unit STRING,longitude NUMERIC,latitude NUMERIC,accuracy INTEGER,samples INTEGER,changeable BOOLEAN,created INTEGER,updated INTEGER, avgSignal INTEGER);
+CREATE TABLE cells (mcc INTEGER,mnc INTEGER,lac INTEGER,cid INTEGER,longitude REAL,latitude REAL,altitude REAL,accuracy REAL,samples INTEGER);
+
+.header on
+.mode csv
+
+.import "$OCI_FILE" cells_import
+.import "$MOZ_FILE" cells_import
+.import "$RCO_FILE" cells_import
+
+UPDATE cells_import SET samples=1 WHERE samples IS NULL OR samples < 1;
+
+INSERT INTO cells
+SELECT mcc, mnc, lac, cid,
+ sum(longitude * samples) / sum(samples) as longitude,
+ sum(latitude * samples) / sum(samples) as latitude,
+ -1 as altitude,
+ sum(accuracy * samples) / sum(samples) as accuracy,
+ sum(samples) as samples
+FROM cells_import
+GROUP BY mcc, mnc, lac, cid;
+
+DROP TABLE cells_import;
+
+UPDATE cells SET accuracy=500 WHERE accuracy < 500;
+UPDATE cells SET accuracy=100000 WHERE accuracy > 100000;
+
+CREATE INDEX _idx1 ON cells (mcc, mnc, lac, cid);
+CREATE INDEX _idx2 ON cells (lac, cid);
+
+VACUUM;
+SQL
+
+else
+ echo "Download error"
+fi
+
+rm $OCI_FILE
+rm $MOZ_FILE
+rm $RCO_FILE