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summary: Ensure that the GPIO control interface works.
details: |
The gpio-control interface allows read/write access to GPIO devices.
# TODO: extend to support ubuntu-core VM, but gpio-sim module is not included in the pc-kernel
# TODO: extend to support ubuntu-core-arm
# TODO: extend the test to cover PI
systems: [ubuntu-24.04-*]
prepare: |
# set up a simulated GPIO device, see
# https://www.kernel.org/doc/html/latest/admin-guide/gpio/gpio-sim.html
apt install -y "linux-modules-extra-$(uname -r)"
modprobe gpio-sim
mkdir /sys/kernel/config/gpio-sim/snaptest
mkdir /sys/kernel/config/gpio-sim/snaptest/gpio-bank0
mkdir /sys/kernel/config/gpio-sim/snaptest/gpio-bank0/line0
echo snap-test > /sys/kernel/config/gpio-sim/snaptest/gpio-bank0/line0/name
echo 1 > /sys/kernel/config/gpio-sim/snaptest/live
echo "Given the test-snapd-gpio-control snap is installed"
snap install test-snapd-gpio-control
restore: |
echo 0 > /sys/kernel/config/gpio-sim/snaptest/live || true
rmdir /sys/kernel/config/gpio-sim/snaptest/gpio-bank0/line0 || true
rmdir /sys/kernel/config/gpio-sim/snaptest/gpio-bank0 || true
rmdir /sys/kernel/config/gpio-sim/snaptest || true
rmmod gpio-sim || true
execute: |
echo "The interface is not connected by default"
#shellcheck disable=SC1117
snap connections test-snapd-gpio-control | MATCH '^gpio-control +test-snapd-gpio-control:gpio-control +-'
echo "When the interface is connected"
snap connect test-snapd-gpio-control:gpio-control
echo "Then the snap is able list GPIO devices"
# example gpiodetect output:
# gpiochip0 [pinctrl-bcm2711] (58 lines)
# gpiochip1 [raspberrypi-exp-gpio] (8 lines)
# there could be additional devices already present
test-snapd-gpio-control.gpiodetect | MATCH 'gpiochip[0-9]+ .* \(.* lines\)'
# and our gpio sim device
test-snapd-gpio-control.gpiodetect | MATCH 'gpiochip[0-9]+ .*gpio-sim.* \(1 lines\)'
# and we can list lines
test-snapd-gpio-control.gpioinfo | MATCH 'line\s+0:\s+"snap-test"'
echo "When the plug is disconnected"
snap disconnect test-snapd-gpio-control:gpio-control
echo "Then the snap is not able to access the GPIO devices"
if test-snapd-gpio-control.gpiodetect 2> call.error; then
echo "Expected permission error with disconnected plug"
exit 1
fi
MATCH "unable to open chip '/dev/gpiochip[0-9]+': Operation not permitted" < call.error
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