#!/bin/bash

export PATH=/bin:/usr/bin:/sbin:/usr/sbin
shopt -s expand_aliases

dryRun=0

echo "*** ZeroTier One install/update ***"

if [ "$UID" -ne 0 ]; then
	echo "Not running as root so doing dry run (no modifications to system)..."
	dryRun=1
fi

if [ $dryRun -gt 0 ]; then
	alias ln="echo '>> dry run: ln'"
	alias rm="echo '>> dry run: rm'"
	alias mv="echo '>> dry run: mv'"
	alias chown="echo '>> dry run: chown'"
	alias chgrp="echo '>> dry run: chgrp'"
	alias chkconfig="echo '>> dry run: chkconfig'"
	alias zerotier-cli="echo '>> dry run: zerotier-cli'"
	alias service="echo '>> dry run: service'"
fi

scriptPath="`dirname "$0"`/`basename "$0"`"
if [ ! -r "$scriptPath" ]; then
	scriptPath="$0"
	if [ ! -r "$scriptPath" ]; then
		echo "Installer cannot determine its own path; $scriptPath is not readable."
		exit 2
	fi
fi

endMarkerIndex=`grep -a -b -E '^################' "$scriptPath" | head -c 16 | cut -d : -f 1`
if [ "$endMarkerIndex" -le 100 ]; then
	echo 'Internal error: unable to find end of script / start of binary data marker.'
	exit 2
fi
blobStart=`expr $endMarkerIndex + 17`
if [ "$blobStart" -le "$endMarkerIndex" ]; then
	echo 'Internal error: unable to find end of script / start of binary data marker.'
	exit 2
fi

echo 'Extracting files...'
if [ $dryRun -gt 0 ]; then
	echo ">> dry run: tail -c +$blobStart \"$scriptPath\" | gunzip -c | tar -xvop -C / -f -"
else
	tail -c +$blobStart "$scriptPath" | gunzip -c | tar -xvop -C / -f -
fi

if [ $dryRun -eq 0 -a ! -d "/var/lib/zerotier-one" ]; then
	echo 'Archive extraction failed, cannot find zerotier-one binary in "/var/lib/zerotier-one".'
	exit 2
fi

echo 'Installing zerotier-cli command line utility...'

rm -f /usr/bin/zerotier-cli
ln -sf /var/lib/zerotier-one/zerotier-one /usr/bin/zerotier-cli

echo 'Installing and (re-)starting zerotier-one daemon...'

chkconfig zerotier-one on
service zerotier-one restart

sleep 1
zerotier-cli info

exit 0

# Do not remove the last line or add a carriage return to it! The installer
# looks for an unterminated line beginning with 16 #'s in itself to find
# the binary blob data, which is appended after it.

################