Added bmc.sh shell
This "shell" written in BASH provides the basic functionality of the Raspberry Pi BMC, making use of the WiringPi `gpio` command and `sudo` to allow privileged execution of certain functions by a non-root user.
This commit is contained in:
Joshua M. Boniface
GitHub
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#!/bin/bash
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stty eof undef
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stty intr undef
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hostsystem="$( cat /etc/bmchost )"
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packages=( screen wiringpi )
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pkgfail=""
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for package in ${packages[@]}; do
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dpkg -l | grep "^ii ${package}" &>/dev/null || pkgfail="true"
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done
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if test -n "$pkgfail"; then
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echo -n "Installing required packages... "
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sudo apt update &>/dev/null
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sudo apt install -y ${packages[@]} &>/dev/null
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echo "done."
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fi
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help() {
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echo -e "Available commands:"
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echo -e " \e[1mstate\e[0m - Show the system power state"
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echo -e " \e[1mconsole\e[0m - Connect to host via serial console; ^A+D to disconnect"
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echo -e " \e[1mpowersw\e[0m - Press power switch on host"
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echo -e " \e[1mresetsw\e[0m - Press reset switch on host"
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echo -e " \e[1mkill\e[0m - Forcibly power off host"
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echo -e " \e[1mhelp\e[0m - This help menu"
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echo -e " \e[1mbmc\e[0m - Show BMC information"
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echo -e " \e[1mhostname\e[0m - Set BMC hostname"
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echo -e " \e[1mpassword\e[0m - Set BMC password"
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echo -e " \e[1mshell\e[0m - Start a BMC bash shell"
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echo -e " \e[1mexit/logout\e[0m - Disconnect from the BMC"
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}
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bmcinfo() {
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echo -e "BMC information:"
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echo -e " IP address: $( ip -4 addr list eth0 | grep inet | awk '{ print $2 }' )"
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echo -e " Hostname: $( hostname )"
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echo -e " BMC temperature: $( /opt/vc/bin/vcgencmd measure_temp | awk -F'=' '{ print $2 }' )"
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}
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sethostname() {
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echo -n "Enter new hostname: "
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read newhostname
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sudo sed -i '/^127.0.1.1/d' /etc/hosts &>/dev/null
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sudo tee -a /etc/hosts <<<"127.0.1.1 $newhostname" &>/dev/null
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sudo hostname $newhostname &>/dev/null
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sudo tee /etc/hostname <<<"$newhostname" &>/dev/null
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echo "Hostname set to $newhostname"
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}
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setpassword() {
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echo -n "Enter new BMC password: "
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read -s password_1
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echo
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echo -n "Reenter new BMC password: "
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read -s password_2
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echo
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if [ "${password_1}" == "${password_2}" ]; then
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echo -n "Setting BMC password... "
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sudo chpasswd <<<"bmc:${password_1}"
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echo "done."
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else
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echo "Passwords to not match!"
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fi
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}
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resetsw() {
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echo -n "Pressing reset switch... "
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gpio mode 0 out
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gpio write 0 1
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gpio write 0 0
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sleep 1
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echo "done."
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}
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powersw() {
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if [ "$1" == "hard" ]; then
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delay='sleep 10'
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echo -n "Holding power switch... "
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else
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delay='sleep 1'
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echo -n "Pressing power switch... "
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fi
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gpio mode 1 out
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gpio write 1 1
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$delay
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gpio write 1 0
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sleep 2
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echo "done."
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}
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readpower() {
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gpio mode 2 in
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powerstate_raw=$(gpio read 2)
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if [ "${powerstate_raw}" -eq 1 ]; then
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powerstate="\e[32mOn\e[0m"
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else
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powerstate="\e[31mOff\e[0m"
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fi
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}
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readpower
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echo
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echo -e "--------------------"
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echo -e "| Raspberry Pi BMC |"
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echo -e "--------------------"
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echo
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echo -e "Host system: \e[1m${hostsystem}\e[0m"
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echo -e "Host state: $powerstate"
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echo
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help
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echo
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while true; do
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stty eof undef
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stty intr undef
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echo -en "\e[1m\e[34m[$(hostname)]>\e[0m "
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read input
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case $input in
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'state')
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readpower
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echo -e "Host state: $powerstate"
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echo
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;;
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'console')
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echo "Starting console..."
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sudo screen -r serialconsole &>/dev/null || sudo screen -S serialconsole /dev/ttyUSB0 115200
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echo
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;;
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'powersw')
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powersw soft
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readpower
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echo -e "Host state: $powerstate"
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echo
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;;
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'resetsw')
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resetsw
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readpower
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echo -e "Host state: $powerstate"
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echo
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;;
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'kill')
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powersw hard
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readpower
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echo -e "Host state: $powerstate"
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echo
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;;
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'help')
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help
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echo
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;;
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'bmc')
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bmcinfo
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echo
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;;
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'hostname')
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sethostname
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echo
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;;
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'password')
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setpassword
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echo
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;;
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'shell')
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stty sane
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/bin/bash
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help
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echo
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;;
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'exit'|'logout')
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exit 0
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;;
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'')
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continue
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;;
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*)
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echo "Invalid command."
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echo
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;;
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esac
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done
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