scripts/g2-next at master · camuso/scripts · GitHub

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#!/bin/bash
#
# g2-next
#

[ -n "$MYDIR" ] || {
	declare MYDIR=
	MYDIR="$(dirname -- "${0}")"
}

[ -n "$MYLIB" ] || {
	declare MYLIB=
	MYLIB="${MYDIR}/lib"
}

[ "$ui_loaded" ] || source "${MYLIB}/ui.source"

declare -i termbkgnd=
declare usagestr="$(
cat <<EOF

$(basename "$0")\0
EOF
)"

usage() {
	echo -e "$usagestr"
}

# control_c: run if user hits control-c
#
# Global
#   CTLC_EXIT - bash environment variable
#
control_c() {
	echo -e "\nCtrl-c detected\nCleaning up and exiting."
	exit $CTLC_EXIT
}

# exitme
#
# Globals
#   ui exit codes - see lib/ui.source
#   ui_err_msg array
#
# Arguments
#   $1 - exit code
#   $2 - optional string to precede cli message
#
exitme() {
	local -i code=$1
	local str="$2"

	((code == ui_exit_ok)) && exit "$code"
	ui_print_climsg "$code" "$str"
	usage
	exit "$code"
}

# init
#
# GLOBALS
#
init() {
	ui_setbg termbkgnd

	echo "b_color: $b_color"
}

choose_kernel() {
	local gstr="$1"
	local choice
	local kstr
	local -i idx=1
	local -i total
	local -i nwidth

	total=$(wc -l < <(grep index <<< "$g2raw"))
	nwidth=${#total}

	echo -e "${MNU}Choose one of these kernels for next boot$OFF"
	while read line; do
		grep -q '^kernel' <<< "$line" || continue
		kstr=$(cut -d= -f2 <<< "$line")
		echo -en "  $MNU"
		ui_padfield "$idx. " " " "$nwidth"
		echo -e "$OFF$kstr"
		let ++idx
	done <<< "$gstr"

	loop_range 1 "$total" choice
	grub2-reboot "$((choice -1 ))"

}

main() {
	local g2raw
	local kern

        # Trap for control-c
        trap control_c SIGINT

	init

	g2raw="$(grubby --info=ALL | grep -A1 index)"
	choose_kernel "$g2raw" kern

	exitme $ui_exit_ok
}

main "$@"