mirror of https://github.com/gnss-sdr/gnss-sdr
Add script to download latest Galileo almanac from EUSPA website
This commit is contained in:
Carles Fernandez
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#!/bin/sh
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# GNSS-SDR shell script that tries to download the latest Galileo Almanac file
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# published by the European GNSS Service Centre.
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#
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# Usage: ./download-galileo-almanac.sh
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#
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# SPDX-FileCopyrightText: 2022 Carles Fernandez-Prades <cfernandez(at)cttc.es>
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# SPDX-License-Identifier: GPL-3.0-or-later
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if ! [ -x "$(command -v wget)" ]; then
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echo "Please install wget before using this script."
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exit 1
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fi
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help()
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{
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echo "This script tries to download the most recent Galileo Almanac XML file"
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echo "published by the European GNSS Service Centre."
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echo "More info at https://www.gsc-europa.eu/product-almanacs"
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echo "If today there is no published file, the script will look up to one week ago."
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echo ""
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echo "Usage:"
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echo "./download-galileo-almanac.sh [OPTION]"
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echo " Options:"
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echo " -h, --help Prints this message"
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echo " -r, --rename Gets latest Galileo Almanac XML file and saves it as gal_almanac.xml"
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echo " -d, --date [date] Retrieves file for a specific date, with format YYYY-MM-DD"
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echo " -rd [date] Retrieves file for a specific date, with format YYYY-MM-DD"
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echo " and saves it as gal_almanac.xml"
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echo ""
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echo " Examples:"
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echo " ./download-galileo-almanac.sh # Gets latest Galileo Almanac XML file"
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echo " ./download-galileo-almanac.sh -r # Gets latest Galileo Almanac XML file, stores it as gal_almanac.xml"
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echo " ./download-galileo-almanac.sh -d 2022-03-15 # Gets Galileo Almanac XML file for that day"
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echo " ./download-galileo-almanac.sh -rd 2022-03-15 # Gets Galileo Almanac XML file for that day, stores it as gal_almanac.xml"
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}
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if (([ "$1" = "-h" ]) || ([ "$1" = "--help" ])) ; then
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help
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exit 0
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fi
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RENAME=""
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if (([ "$1" = "-r" ]) || ([ "$1" = "--rename" ])) ; then
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RENAME=" -O gal_almanac.xml "
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fi
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BASE_URL="https://www.gsc-europa.eu/sites/default/files/sites/all/files/"
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YEAR=$(date '+%Y')
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SPACING="-"
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MONTH=$(date '+%m')
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DAY=$(date '+%d')
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TERMINATION1="_0.xml"
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TERMINATION2=".xml"
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COUNTER=1
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MAX_COUNTER=7
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if (([ "$1" = "-d" ]) || ([ "$1" = "--date" ])) ; then
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if wget "$BASE_URL$2$TERMINATION2" >/dev/null 2>&1 ; then
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echo "Downloaded latest Galileo almanac from $BASE_URL$2$TERMINATION2"
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exit 0
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else
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echo "Couldn't find an XML file for that date."
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exit 1
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fi
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elif [ "$1" = "-rd" ] ; then
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if wget -O gal_almanac.xml "$BASE_URL$2$TERMINATION2" >/dev/null 2>&1 ; then
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echo "Downloaded latest Galileo almanac from $BASE_URL$2$TERMINATION2"
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exit 0
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else
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echo "Couldn't find an XML file for that date."
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rm gal_almanac.xml
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exit 1
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fi
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else
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echo "According to system time, today is $(date '+%Y-%m-%d'). Searching for the latest Galileo almanac ..."
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fi
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lowercase()
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{
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echo "$1" | sed "y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/"
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}
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OS=`lowercase \`uname\``
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date_before()
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{
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if [ "$OS" = "darwin" ]; then
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YEAR=$(date -v -"$COUNTER"d '+%Y')
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MONTH=$(date -v -"$COUNTER"d '+%m')
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DAY=$(date -v -"$COUNTER"d '+%d')
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else
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YEAR=$(date -d "$COUNTER day ago" '+%Y')
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MONTH=$(date -d "$COUNTER day ago" '+%m')
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DAY=$(date -d "$COUNTER day ago" '+%d')
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fi
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COUNTER=$(($COUNTER+1))
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}
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try_download()
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{
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while [ $COUNTER -le $MAX_COUNTER ]
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do
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url="$BASE_URL$YEAR$SPACING$MONTH$SPACING$DAY$TERMINATION2"
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if wget $RENAME $url >/dev/null 2>&1 ; then
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echo "Downloaded latest Galileo almanac from $url"
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exit 0
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else
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date_before
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try_download
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fi
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done
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}
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url="$BASE_URL$YEAR$SPACING$MONTH$SPACING$DAY$TERMINATION1"
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if wget $RENAME $url >/dev/null 2>&1 ; then
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echo "Downloaded latest Galileo almanac from $url"
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else
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try_download
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echo "Couldn't find a recent Galileo almanac."
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exit 1
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fi
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