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#!/bin/bash

# instant-rsyncd lets you quickly set up and start a simple, unprivileged rsync
# daemon with a single module in the current directory.  I've found it
# invaluable for quick testing, and I use it when writing a list of commands
# that people can paste into a terminal to reproduce a daemon-related bug.
# Sysadmins deploying an rsync daemon for the first time may find it helpful as
# a starting point.
#
# Usage: instant-rsyncd MODULE PORT RSYNCD-USERNAME [RSYNC-PATH]
# The script asks for the rsyncd user's password twice on stdin, once to set it
# and once to log in to test the daemon.
# -- Matt McCutchen <matt@mattmccutchen.net>

set -e

dir="$(pwd)"

echo
echo "This will setup an rsync daemon in $dir"

if [ $# = 0 ]; then
	IFS='' read -p 'Module name to create (or return to exit): ' module
	[ ! "$module" ] && exit
else
	module="$1"
	shift
fi

if [ $# = 0 ]; then
	IFS='' read -p 'Port number the daemon should listen on [873]: ' port
else
	port="$1"
	shift
fi
[ "$port" ] || port=873

if [ $# = 0 ]; then
	IFS='' read -p 'User name for authentication (empty for none): ' user
else
	user="$1"
	shift
fi

if [ "$user" ]; then
	IFS='' read -s -p 'Desired password: ' password
	echo
fi

rsync="$1"
[ "$rsync" ] || rsync=rsync

moduledir="${dir%/}/$module"

mkdir "$module"

cat >rsyncd.conf <<EOF
log file = rsyncd.log
pid file = rsyncd.pid
port = $port
use chroot = no

[$module]
    path = $module
    read only = false
EOF

if [ "$user" ]; then
	cat >>rsyncd.conf <<-EOF
	    auth users = $user
	    secrets file = $module.secrets
	EOF
	touch "$module".secrets
	chmod go-rwx "$module".secrets
	echo "$user:$password" >"$module".secrets
	user="$user@"
fi

cat >start <<EOF
#!/bin/bash
set -e
cd \`dirname \$0\`
! [ -e rsyncd.pid ] || {
	echo "Is the daemon already running?  If not, delete rsyncd.pid."
	exit 1
}
$rsync --daemon --config=rsyncd.conf
EOF
chmod +x start

cat >stop <<"EOF"
#!/bin/bash
set -e
cd `dirname $0`
! [ -e rsyncd.pid ] || kill -s SIGTERM $(< rsyncd.pid)
EOF
chmod +x stop

path="rsync://$user$(hostname):$port/$module/"

if ./start; then
	sleep .2
	echo
	echo "I ran the start command for the daemon.  The log file rsyncd.log says:"
	echo
	cat rsyncd.log
	echo
	echo "You can start and stop it with ./start and ./stop respectively."
	echo "You can customize the configuration file rsyncd.conf."
	echo
	echo "Give rsync the following path to access the module:"
	echo "    $path"
	echo
	if [ "$user" ]; then
		echo "Let's test the daemon now.  Enter the password you chose at the prompt."
	else
		echo "Let's test the daemon now."
	fi
	echo
	echo '$' $rsync --list-only "$path"
	$rsync --list-only "$path"
	echo
	echo "You should see an empty folder; it's $moduledir."
else
	echo "Something went wrong.  Do you see an error message?"
fi