Updating X-Plane's US Nav Data from the FAA CIFP

#!/bin/bash

#######################################
# This script updates the US nav data #
# in X-Plane from the official FAA    #
# Coded Instrument Flight Procedures  #
# data in an automated fashion        #
#######################################

## Requirements
## 1. Set a working directory in the WORKING_DIR variable below (you create this)
## 2. Set the XPLANE_DIR variable to your X-Plane "Custom Data" directory
## 3. Download the appropriate "convert424toxplane" tool to the specified working directory

## Notes
## - Dropbox link to tool (could go stale):
##     https://www.dropbox.com/sh/k9gkuztcogzk8ik/AACWQljNVNAjlApLtpbGCM70a/linux?dl=0&subfolder_nav_tracking=1
## - Note the dependencies.txt file in the dropbox folder and ensure you have the proper libraries
##     (if you cannot find the exact versions called out, symlinking to a newer version worked for me)
##     (ie: # ln -s /usr/lib64/libboost_serialization.so.1.81.0 /usr/lib64/libboost_serialization.so.1.78.0)
## - Once executed, *ONLY* US nav data will be available in X-Plane

## User Variables
WORKING_DIR=</path/to/working/directory>
ULIMIT=$(ulimit -n)
XPLANE_DIR=</path/to/X-Plane Custom Data directory> ## NOTE: If using smb mount, set this as "$WORKING_DIR/mountdir"
## If using an smb mount back to a Windows box where X-Plane is installed, uncomment and set the following two
## variables appropriately. The expectation is that X-Plane's "Custom Data" directory is shared with that name
## and is accessible & writable by guest without a password. You could also change the mount parameters below if
## you want to use a specifc user, provide a password, change the mount path, etc.
#SMB_XPLANE_HOST=<IP or hostname of system running X-Plane>
#SMB_XPLANE_CUSTOM_DATA_SHARE="Custom Data"

## Uncomment the following two lines if using smb mount (adjusting if necessary)
#mkdir $WORKING_DIR/mountdir
#mount.smb3 //$SMB_XPLANE_HOST/"SMB_$XPLANE_CUSTOM_DATA_SHARE" $WORKING_DIR/mountdir -o user=guest,password=''

## Set variables to check to see if newer nav data is available
LATEST_CIFP_URL=`curl -s https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/cifp/download/ | grep Zip | tail -1 | cut -d'"' -f2`
LATEST_CIFP_LAST_MOD=`curl -sI $(curl -s https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/cifp/download/ | grep Zip | tail -1 | cut -d'"' -f2) | grep -i Last-Modified | cut -d" " -f3,4,5 | tr 'a-z' 'A-Z' | sed s/" "/""/g`
CURRENT_XPLANE_NAV_DATA=`head -n1 $XPLANE_DIR/earth_424.dat | awk -F" " '{print$3}' | cut -b-11 | sed s/"-"/""/g`
LATEST_CIFP_ZIP=`echo $LATEST_CIFP_URL |  awk -F "/" '{print $NF}'`

## Check to see if nav data needs an update
if [[ "$LATEST_CIFP_LAST_MOD" == "$CURRENT_XPLANE_NAV_DATA" ]];
then
        echo -e "\nNav data is current. No update necessary. Exiting.\n"
        echo -e "LATEST ONLINE RELEASE:         $LATEST_CIFP_LAST_MOD"
        echo -e "CURRENT X-PLANE RELEASE:       $CURRENT_XPLANE_NAV_DATA\n"
        umount -q $WORKING_DIR/mountdir
        rmdir $WORKING_DIR/mountdir
        exit
fi

bold=$(tput bold)
normal=$(tput sgr0)

## Safety Check
if [ ! -d "$WORKING_DIR" ]
then
        echo -e "\nWorking directory not found. Please verify WORKING_DIR variable is correct.\n"
        exit
else

## Retrieve latest CIFP archive
echo -e "\nLATEST ONLINE RELEASE:               $LATEST_CIFP_LAST_MOD"
echo -e "CURRENT X-PLANE RELEASE:       $CURRENT_XPLANE_NAV_DATA\n"
echo -e "\nDownloading latest CIFP archive.. ($LATEST_CIFP_URL)\n"
wget --quiet -N $LATEST_CIFP_URL

## Create dir for extraction & extract CIFP package
mkdir $WORKING_DIR/extracted
echo -e "Extracting archive..\n"
unzip -q -o $WORKING_DIR/$LATEST_CIFP_ZIP -d $WORKING_DIR/extracted

## Rename file for converter program
cd $WORKING_DIR/extracted
mv FAACIFP18 FAACIFP18.dat

## File descriptor check (needs at least 2048 set or convert will fail)
if (( $ULIMIT < 2048 ))
then
        echo $ULIMIT > $WORKING_DIR/orig_ulimit.out
        ORIG_ULIMIT=$(cat $WORKING_DIR/orig_ulimit.out)
        echo -e "${normal}ulimit of $ULIMIT is too low. Increasing to 2048.\n"
        ulimit -n 2048
fi

## Run conversion
echo -e "Running convert424toxplane..\n"
echo -e "==========PROGRAM OUTPUT=========="
$WORKING_DIR/convert424toxplane FAACIFP18.dat ""
echo -e "==================================\n"

## Copy files to X-Plane directory (via the smb mount in this case)
cp -r earth_nav.dat earth_fix.dat earth_awy.dat CIFP/ FAACIFP18.dat $XPLANE_DIR
cd $XPLANE_DIR
rm earth_424.dat
mv FAACIFP18.dat earth_424.dat
echo -e "Copied new data to X-Plane directory.\n"
echo -e "New Data Effective Date: ${bold}$(grep EFFECTIVE earth_424.dat | awk '{print $9 $10 $11}')\n"

## Cleanup
echo -e "${normal}Cleaning up..\n"
cd $WORKING_DIR
umount -q $XPLANE_DIR
ulimit -n $ORIG_ULIMIT
rm -rf aeronav.faa.gov extracted orig_ulimit.out $LATEST_CIFP_ZIP
rmdir mountdir
fi
exit