View difference between Paste ID: nUwsxYEx and ns7MqCBi

 #!/bin/bash
 
 # Copyright 2014 Dagg Stompler <daggs@gmx.com>
 #
 # This script manages sound card selection for non PuleAudio based systems.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 2 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 PREFIX="ms_alsa_"
-INSTANCE="$(basename $0)"
+INSTANCE="${BASH_SOURCE[0]}"
 SERVED=0
 CONF_FILE_PATH="/etc/conf.d/multiseat_alsa_sound.conf"
 LINKS_PATH="/usr/local/bin"
 GROUP="users"
 INT_REGEX='^[0-9]+$'
 LABELS_DB_PATH="/usr/share/misc"
 
-if [ "${INSTANCE}" == "bash" ]; then
+if [ -z "${INSTANCE}" ]; then
-	INSTANCE="${BASH_SOURCE[0]}"
+	INSTANCE="$(basename $0)"
 fi
 
 # entry 0 must be install.
 declare -a CONNECTORS=("${LINKS_PATH}/install" "${LINKS_PATH}/uninstall" "/etc/profile.d/update_asoundrc.sh" "${LINKS_PATH}/list_seats")
 declare -a ASOUNDRC_ADDONS=("defaults.pcm.card" "defaults.ctl.card" "defaults.pcm.device" "defaults.ctl.device")
 declare cards_info=()
 declare assignments=()
 
 populate_cards()
 {
 	OLDIFS=${IFS}
 	IFS=$'\n'
 	i=0
 
 	for card in $(egrep -lR "^id: " /proc/asound/card* | egrep "pcm[0-9]{1,}p" | egrep -v "sub[0-9]{1,}"); do
 		local line=""
 		local folder="$(realpath $(dirname ${card})/..)"
 		local card_path_id="$(basename ${folder})"
 		local vendor=""
 		local device=""
 		local type_usb=0
 
 		if [ -f "${folder}/usbid" ]; then
 			vendor=$(cat ${folder}/usbid | cut -f1 -d:)
 			device=$(cat ${folder}/usbid | cut -f2 -d:)
 			type_usb=1
 		else
 			vendor=$(cat /sys/class/sound/${card_path_id}/device/vendor | sed 's/0x//g')
 			device=$(cat /sys/class/sound/${card_path_id}/device/device | sed 's/0x//g')
 		fi
 		line+="${vendor};${device}"
 		line+=";$(grep "^name: " ${card} | sed 's/^name: //g');${type_usb}"
 		cards_info[${i}]=${line}
 		i=$((i+1))
 	done
 	IFS=${OLDIFS}
 }
 
 get_card_label()
 {
 	local vid="$1"
 	local did="$2"
 	local type_usb="$3"
 	local db_file=${LABELS_DB_PATH}
 
 	if [ ${type_usb} -eq 1 ]; then
 		db_file+="/usb.ids"
 	else
 		db_file+="/pci.ids"
 	fi
 	local sline=$(egrep -n "^[0-9a-f]{4} " ${db_file} | grep -A1 ${vid} | head -1 | cut -f 1 -d ':')
 	local eline=$(egrep -n "^[0-9a-f]{4} " ${db_file} | grep -A1 ${vid} | tail -1 | cut -f 1 -d ':')
 	local label="$(sed -n "${sline},${eline}p" ${db_file} | grep ${did} | head -1 | cut -d' ' -f2- | sed 's/^\s*//g')"
 
 	echo "${label}"
 }
 
 install_files()
 {
 	echo "installing..."
 	rm ${CONF_FILE_PATH} -rf
 	for i in $(seq 0 $((${#assignments[@]}-1))); do
 		echo "${assignments[${i}]}" >> ${CONF_FILE_PATH}
 	done
 
 	local link_path="$(realpath $0)"
 	local target_path
 	if [ ! -e ${LINKS_PATH} ]; then
 		mkdir -p ${LINKS_PATH}
 	fi
 	for option in "${CONNECTORS[@]}"; do
 		target_path="$(dirname ${option})/${PREFIX}$(basename ${option})"
 		if [ ! -h "${target_path}" ]; then
 			echo "creating link ${target_path}..."
 			ln -s ${link_path} ${target_path}
 		fi
 	done
 	chown root:${GROUP} $0 ${CONF_FILE_PATH}
 	chmod 754 $0 ${CONF_FILE_PATH}
 	IFS=$'\n'
 	for entry in $(getent passwd); do
 		username="$(echo ${entry} | cut -d: -f1)"
 		if [ $(groups ${username} | grep -c users) -eq 1 ]; then
 			local home="$(getent passwd ${username} | cut -d: -f6)"
 			rm -rf ${home}/.asoundrc
 			for option in "${ASOUNDRC_ADDONS[@]}"; do
 				echo "${option} 0" >> ${home}/.asoundrc
 			done
 		fi
 	done
 	unset IFS
 }
 
 get_seat_id()
 {
 	local seat=$(echo ${DISPLAY} | sed 's/^://g')
 
 	if ! [[ ${seat} =~ ${INT_REGEX} ]]; then
 		echo "invalid seat id"
 		exit 1
 	fi
 	echo ${seat}
 }
 
 get_data_from_entry()
 {
 	local entry="$*"
 	local vid=$(echo ${entry} | cut -f 1 -d ';')
 	local did=$(echo ${entry} | cut -f 2 -d ';')
 	local hdr=$(echo ${entry} | cut -f 3 -d ';')
 	local is_type_usb=$(echo ${entry} | cut -f 4 -d ';')
 	local line=""
 
 	for card in $(egrep -lR "^id: " /proc/asound/card* | egrep "pcm[0-9]{1,}p" | egrep -v "sub[0-9]{1,}"); do
 		local folder="$(realpath $(dirname ${card})/..)"
 		local card_path_id="$(basename ${folder})"
 		local vendor=""
 		local device=""
 		local header=""
 		local type_usb=0
 
 		if [ -f "${folder}/usbid" ]; then
 			vendor=$(cat ${folder}/usbid | cut -f1 -d:)
 			device=$(cat ${folder}/usbid | cut -f2 -d:)
 			type_usb=1
 		else
 			vendor=$(cat /sys/class/sound/${card_path_id}/device/vendor | sed 's/0x//g')
 			device=$(cat /sys/class/sound/${card_path_id}/device/device | sed 's/0x//g')
 		fi
 		header="$(grep "^name: " ${card} | sed 's/^name: //g')"
 		if [ "${vid}" == "${vendor}" -a "${did}" == "${device}" -a  "${hdr}" == "${header}" -a ${is_type_usb} -eq ${type_usb} ]; then
 			line="${card}"
 			break
 		fi
 	done
 	echo "${line}"
  }
 
 get_card_id()
 {
 	local path_to_file=$(get_data_from_entry $*)
 
 	if [ -z "${path_to_file}" ]; then
 		echo ""
 	else
 		echo "$(egrep "^card: " ${path_to_file} | cut -f 2 -d ':' | sed 's/ //g')"
 	fi
 }
 
 get_dev_id()
 {
 	local path_to_file=$(get_data_from_entry $*)
 
 	if [ -z "${path_to_file}" ]; then
 		echo ""
 	else
 		echo "$(egrep "^device: " ${path_to_file} | cut -f 2 -d ':' | sed 's/ //g')"
 	fi
 }
 
 list_seats()
 {
 	IFS=$'\n'
 	echo "Seats sound config:"
 	for entry in $(cat ${CONF_FILE_PATH}); do
 		local key=$(echo ${entry} | cut -f1 -d=)
 		local value=$(echo ${entry} | cut -f2 -d=)
 		local vid=$(echo ${value} | cut -f 1 -d ';')
 		local did=$(echo ${value} | cut -f 2 -d ';')
 		local type_usb=$(echo ${value} | cut -f 4 -d ';')
 		local label="$(get_card_label ${vid} ${did} ${type_usb})"
 		echo -n "	 - $(echo ${key} | sed 's/t/t /g')) Vendor ID ${vid}, Device ID ${did}: ${label}, type: "
 		if [ ${type_usb} -eq 1 ]; then
 			echo "usb."
 		else
 			echo "pci."
 		fi
 	done
 	unset IFS
 }
 
 install()
 {
 	if [ "$(whoami)" != "root" ]; then
 		echo "this program must be run as root"
 		exit 1
 	fi
 	local i=0
 	populate_cards
 
 	avail_enteries=("${cards_info[@]}")
 	local selection=""
 	local seat_id=0
 	local avail_card
 
 	while [ 1 ]; do
 		echo "Available cards:"
 		avail_card=0
 		while [ ${#avail_enteries[@]} -gt ${avail_card} ]; do
 			local vid=$(echo ${avail_enteries[${avail_card}]} | cut -f 1 -d ';')
 			local did=$(echo ${avail_enteries[${avail_card}]} | cut -f 2 -d ';')
 			local type_usb=$(echo ${avail_enteries[${avail_card}]} | cut -f 4 -d ';')
 			local label="$(get_card_label ${vid} ${did} ${type_usb})"
 			echo "	$((avail_card+1)). ${vid}:${did}, Label: ${label}, type $(echo ${avail_enteries[${avail_card}]} | cut -f 3 -d ';')"
 			avail_card=$((${avail_card} + 1))
 		done
 
 		echo -n "please select card for seat ${seat_id}, I to install or q to quit: "
 		read selection
 		if [ "${selection}" = "I" -o "${selection}" = "q" ]; then
 			break
 		fi
 		if ! [[ ${selection} =~ ${INT_REGEX} ]]; then
 			echo "invalid seletion, please select again."
 			continue
 		elif [ ${selection} -lt 1 -o ${selection} -gt ${#avail_enteries[@]} ]; then
 			echo "invalid seletion, please select again."
 			continue
 		fi
 		local pos=$((${selection} - 1))
 		assignments=("${assignments[@]}" "Seat${seat_id}=$(echo ${avail_enteries[${pos}]})")
 		seat_id=$((seat_id + 1))
 		local last_entry_idx=${#avail_enteries[@]}
 		last_entry_idx=$((last_entry_idx-1))
 		avail_enteries[${pos}]=${avail_enteries[${last_entry_idx}]}
 		unset avail_enteries[${last_entry_idx}]
 	done
  	if [ "${selection}" = "I" ]; then
  		install_files
  	fi
  }
 
 uninstall()
 {
 	for option in "${CONNECTORS[@]}"; do
 		target_path="$(dirname ${option})/${PREFIX}$(basename ${option})"
 		if [ -h "${target_path}" ]; then
 			rm -f ${target_path}
 		fi
 	done
 }
 
 update_asoundrc()
 {
 	if [ "$(whoami)" != "root" -a -f ~/.asoundrc -a $(who | grep "${USER}" | grep -cv "pts") -eq 1 ]; then
 		local entry=$(grep "^Seat$(get_seat_id)=" ${CONF_FILE_PATH} | cut -f 2 -d '=')
 		sed -i "s/\.card [0-9]*/\.card $(get_card_id ${entry})/g" ~/.asoundrc
 		sed -i "s/\.device [0-9]*/\.device $(get_dev_id ${entry} )/g" ~/.asoundrc
 	fi
 }
 
 for option in "${CONNECTORS[@]}"; do
 	cmd="${PREFIX}$(basename ${option})"
 	if [ "$(basename ${INSTANCE})" = "${cmd}" ]; then
 		func=$(echo "$(basename ${option})" | sed 's/\.sh$//g')
 		${func} $*
 		SERVED=1
 		break
 	fi
 done
 
 if [ ${SERVED} -eq 0 ]; then
 	entry=${CONNECTORS[0]}
 	if [ ! -h "$(dirname ${entry})/${PREFIX}$(basename ${entry})" ]; then
 		$(basename ${entry}) $*
 	else
 		echo -n "possible commands: "
 		line=""
 		for option in "${CONNECTORS[@]}"; do
 			line="${line} ${PREFIX}$(basename ${option}), "
 		done
 		echo "$(echo ${line} | sed 's/,$/./g')"
 	fi
 fi