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|
summary: Ensure that the custom-device interface works.
details: |
The custom-device interface allows a gadget snap to provide custom slots
granting access to the devices it defines.
systems: [ubuntu-2*]
prepare: |
# Add our interface to the gadget snap
VERSION="$(tests.nested show version)"
rm -rf pc-gadget
snap download --basename=pc --channel="$VERSION/edge" pc
unsquashfs -d pc-gadget pc.snap
cat >> pc-gadget/meta/snap.yaml << EOF
slots:
v4l:
interface: custom-device
devices:
- /dev/video[0-9]
files:
read:
- /sys/bus/usb/devices
- /sys/class/video4linux
- /sys/kernel/debug/sleep_time
write:
- /proc/sys/vm/stat_interval
udev-tagging:
- kernel: video[0-9]
subsystem: v4l
environment:
var1: foo
var2: bar
attributes:
attr1: one
attr2: two
EOF
snap pack pc-gadget/ --filename=pc-gadget-v4l.snap
remote.push pc-gadget-v4l.snap
remote.exec sudo snap install --dangerous pc-gadget-v4l.snap
# create and install consumer snap
snap pack devices-plug
remote.push devices-plug_1.0_all.snap
remote.exec sudo snap install --dangerous devices-plug_1.0_all.snap
execute: |
echo "When the interface is connected"
remote.exec sudo snap connect devices-plug:v4l pc:v4l
echo "Verify that the udev rule has been generated"
UDEV_RULE="$(remote.exec grep -v '^#' /etc/udev/rules.d/70-snap.devices-plug.rules)"
# Since ENV and ATTR elements appear in random order, we first match the
# rule in its entirety, but without specifying the exact values of ENV and
# ATTR sub-rules:
echo "$UDEV_RULE" | MATCH '^KERNEL=="video\[0-9\]", SUBSYSTEM=="v4l"(, (ENV|ATTR){\w+}=="\w+")+, TAG\+="snap_devices-plug_cmd"$'
# Then we match them individually:
echo "$UDEV_RULE" | MATCH 'ENV{var1}=="foo"'
echo "$UDEV_RULE" | MATCH 'ENV{var2}=="bar"'
echo "$UDEV_RULE" | MATCH 'ATTR{attr1}=="one"'
echo "$UDEV_RULE" | MATCH 'ATTR{attr2}=="two"'
echo "Verify that the snap can write to the writable paths"
OLD_VALUE="$(remote.exec sudo devices-plug.cmd cat /proc/sys/vm/stat_interval)"
# The double quotation is needed or our command will get split and the
# shell redirection will not happen in the right session
remote.exec sudo devices-plug.cmd sh -c "'echo 3 > /proc/sys/vm/stat_interval'"
remote.exec sudo devices-plug.cmd cat /proc/sys/vm/stat_interval | MATCH "3"
remote.exec sudo devices-plug.cmd sh -c "'echo $OLD_VALUE > /proc/sys/vm/stat_interval'"
echo "And can read the readable paths"
remote.exec sudo devices-plug.cmd cat /sys/kernel/debug/sleep_time | MATCH "time"
|
