source-config

#! /bin/bash
# creates a configuration for target system that can be piped to a file

find_bins() {
	# params:
	#	list of exec to find
	#	results var
	[ $# -ne 2 ] && exit 1
	local execs
	local result_var
	local p
	local paths
	local IFS
	local e
	local uid
	declare -a execs=($1)
	result_var=$2
	uid=$(id -u )
	
	#find and check bins
	for e in ${execs[*]}; do
		p=$(which $e 2> /dev/null)
		if [[ $? -ne 0 || $e = "date" ]]; then
			# try to find it
			guess_bin $e
			p="${_guess_bin}"
		fi
		
		# root doesn't need sudo
		if [[ $e == sudo && $uid -eq 0 ]]; then
			p='    '
		fi
		paths="${paths}${p}"$'\n'
	done

	printf -v "${result_var}" '%s' "${paths}"
	
}

guess_bin() {
	# params
	#	exec
	[ $# -ne 1 ] && exit 1
	local ex
	local path_list
	local k
	local cmd
	local IFS
	local out
	ex=$1
	path_list="/sbin /bin /usr/sbin /usr/bin /usr/gnu/bin"
	
	#build command to run
	IFS=' '
	for k in $path_list; do
		if [ -x $k/$ex ]; then 
			out=$k/$ex;
			if [ $ex = date ]; then
				test_date "$out"
				if [ $? -eq 0 ]; then
					break
				else
					out=
				fi
			fi
		else
			out="     "
		fi;
	done
	
	printf -v "_${FUNCNAME}" '%s' "${out}"
}

test_date() {
	# params
	# path to date commmand to test
	local ex
	ex=$1
	$ex --date="-2 days" > /dev/null 2>&1
}

usage() {
	echo "Usage: $(basename $0 .sh)"
	exit 0
}

declare -a VARS=('SUDO=%s' 'ZFS="$SUDO %s"' 'GZIP=%s' 'XZ=%s' 'NC=%s' 'SOCAT=%s' 'MBUFFER=%s' 'CAT=%s' 'OPENSSL=%s' 'LOGGER=%s' 'MAILX=%s' 'SHUF=%s' 'DATE=%s')
#EXECS="sudo zfs zcat xzcat nc socat mbuffer cat openssl logger mailx pv shuf date"
EXECS="sudo zfs gzip xz nc socat mbuffer cat openssl logger mailx pv shuf date"
BINS=
CONFIG_PATH=/etc/zfs-repl
 

#HOST_CONF=$CONFIG_PATH/$HOST.conf

CONFIG="# local source for zfs-repl"$'\n'

find_bins "$EXECS" "BINS"
IFS=$'\n'
i=0
for v in $BINS; do
	printf -v t "${VARS[$i]}" "$v"
	CONFIG="${CONFIG}${t}"$'\n'
	i=$(( i + 1 ))
done

echo "$CONFIG"

tee  << EOF
##### settings
# uncomment the settings below to over ride the defaults in the zfs-repl script
# settings in this file can be over ridden by command line options to zfs-repl script
#
# minimally set the email addresses
mail_from=
mail_to=
mail_subject="zfs-replication log"

#process files/paths
LOCK_PATH=/var/lock
LOG_FILE=/var/log/zfs-repl.log

#log to syslog (true/false)
#SYSLOG=true

#date format used in log file
# see 'man date' or 'info date' for options
#DATE_FORMAT="+%Y-%m-%d %H:%M:%S"

# default transport protocol (see 'zfs-repl --help' for valid options)
#PROTOCOL=MBUFFER

# ssh cipher to use
#SSH_CIPHER="-c blowfish"

#netcat local and remote options
# see 'man nc' for options
#NC_OPTS=
#RMT_NC_OPTS="-l"

#mbuffer local and remote options
# see 'man mbuffer' for options
#MBUFFER_OPTS="-s 128k -m 256M -q -v 1"
#RMT_MBUFFER_OPTS="-s 128k -m 256M -q -v 1"

#socat local and remote options
# see 'man socat' for options
#SOCAT_OPTS=
#RMT_SOCAT_OPTS=
#socat local and remote TCP transport options
#SOCAT_TCP_OPTS="retry=5"
#RMT_SOCAT_TCP_OPTS=

# seconds to wait for non-ssh protocols to initiate send/receive connection before timing out
#REPL_INIT_TIMEOUT=120

# default compression tool and compression level (see 'zfs-repl --help' for valid options)
#COMPRESSION=GZIP
#COMP_LEVEL=6

# for non-ssh protocols set the default port
# 'auto' picks a number within the range specified in PORT_RANGE
# this is helpful when your running multiple concurrent replications to the same host
#PROTOCOL_PORT='auto'
#PORT_RANGE=60000-65000

# always email replication log (true/false)
#SENDMAIL=false

# email repliction log when an error occurs (true/false)
#ERR_MAIL=true

#encrypt replication over non-ssh protocols (true/false)
#ENCRYPT=false

#encryption password.  if left null/blank, a new password will be generated for each replication session
#ENCRYPT_PASSWORD=
EOF