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Refactor into Python daemon and simplified shell

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This commit makes a major change to the organization and operation of the RPi BMC software. The 'shell' (`bmc.sh`) has been greatly simplified,
removing all instances of `wiringpi` GPIO code. The shell communicates with a new Python daemon via a pair of named pipes in `/run/bmcd`.

The Python daemon starts and immediately executes two threads:
1) The first manages reading from `/run/bmcd/bmcd.cmd`, which handles the passing of commands from `bmc.sh`, such as 'powersw_press' or 'locate_on'.
2) The second manages writing the current host state out to `/run/bmcd/bmcd.state`, to be read from `bmc.sh` when needed. It does this every second
   to avoid blocking.

An additional thread with an Event handler manages the flashing power LED for the `locate` functions.
This commit is contained in:
Joshua Boniface
2017-03-31 00:03:52 -04:00
parent a52f8b071f
commit e56002baf8
2 changed files with 122 additions and 74 deletions
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79
bmc.sh Normal file → Executable file
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@ -4,25 +4,18 @@ stty eof undef
stty intr undef
hostsystem="$( cat /etc/bmchost )"
packages=( screen wiringpi )
pkgfail=""
for package in ${packages[@]}; do
dpkg -l | grep "^ii ${package}" &>/dev/null || pkgfail="true"
done
if test -n "$pkgfail"; then
echo -n "Installing required packages... "
sudo apt update &>/dev/null
sudo apt install -y ${packages[@]} &>/dev/null
echo "done."
fi
bmcd_cmdpipe="/run/bmcd/bmcd.cmd"
bmcd_statepipe="/run/bmcd/bmcd.state"
help() {
echo -e "Available commands:"
echo -e " \e[1mstate\e[0m - Show the system power state"
echo -e " \e[1mconsole\e[0m - Connect to host via serial console; ^A+D to disconnect"
echo -e " \e[1mpowersw\e[0m - Press power switch on host"
echo -e " \e[1mresetsw\e[0m - Press reset switch on host"
echo -e " \e[1mpower\e[0m - Press power switch on host"
echo -e " \e[1mreset\e[0m - Press reset switch on host"
echo -e " \e[1mkill\e[0m - Forcibly power off host"
echo -e " \e[1mlocate\e[0m - Enable locator (flash power LED)"
echo -e " \e[1munlocate\e[0m - Disable locator"
echo -e " \e[1mhelp\e[0m - This help menu"
echo -e " \e[1mbmc\e[0m - Show BMC information"
echo -e " \e[1mhostname\e[0m - Set BMC hostname"
@ -60,33 +53,30 @@ setpassword() {
echo "Passwords to not match!"
fi
}
resetsw() {
echo -n "Pressing reset switch... "
gpio mode 0 out
gpio write 0 1
sleep 1
gpio write 0 0
sleep 1
echo "done."
resetsw_press() {
echo "Pressing reset switch."
echo "resetsw_press" > ${bmcd_cmdpipe}
}
powersw() {
if [ "$1" == "hard" ]; then
delay='sleep 10'
echo -n "Holding power switch... "
else
delay='sleep 1'
echo -n "Pressing power switch... "
fi
gpio mode 1 out
gpio write 1 1
$delay
gpio write 1 0
powersw_press() {
echo "Holding power switch."
echo "powersw_hold" > ${bmcd_cmdpipe}
sleep 2
echo "done."
}
powersw_hold() {
echo "Pressing power switch."
echo "powersw_press" > ${bmcd_cmdpipe}
sleep 2
}
locate_on() {
echo "Enabling locator - host power LED will flash."
echo "locate_on" > ${bmcd_cmdpipe}
}
locate_off() {
echo "Disabling locator."
echo "locate_off" > ${bmcd_cmdpipe}
}
readpower() {
gpio mode 2 in
powerstate_raw=$(gpio read 2)
powerstate_raw=$(cat ${bmcd_statepipe})
if [ "${powerstate_raw}" -eq 1 ]; then
powerstate="\e[32mOn\e[0m"
else
@ -118,26 +108,37 @@ case $input in
;;
'console')
echo "Starting console..."
# Connect to screen, or start it
sudo screen -r serialconsole &>/dev/null || sudo screen -S serialconsole /dev/ttyUSB0 115200
# If the user killed screen, restart it - just in case
pgrep screen &>/dev/null || sudo screen -S serialconsole /dev/ttyUSB0 115200
echo
;;
'powersw')
powersw soft
powersw_press
readpower
echo -e "Host state: $powerstate"
echo
;;
'resetsw')
resetsw
resetsw_press
readpower
echo -e "Host state: $powerstate"
echo
;;
'kill')
powersw hard
powersw_hold
readpower
echo -e "Host state: $powerstate"
echo
;;
'locate')
locate_on
echo
;;
'unlocate')
locate_off
echo
;;
'help')
help