tests/kernel-modules-components: test early modules

Test that modules from kernel-modules components are available early
after rebooting.

tests/nested/manual/kernel-modules-components/task.yaml

@@ -80,3 +80,26 @@ execute: |
   remote.exec sudo snap remove pc-kernel+wifi-comp
   not remote.exec grep mac80211_hwsim /lib/modules/*/modules.dep
   not remote.exec sudo modprobe mac80211_hwsim
+
+  # Rule to force module loading on system start (we randomly choose
+  # the rtc device add event for this)
+  rule='ACTION==\"add\", SUBSYSTEM==\"rtc\", KERNEL==\"rtc*\", RUN{builtin}+=\"kmod load mac80211_hwsim\"\n'
+  remote.exec "sudo sh -c 'printf \"$rule\" > /etc/udev/rules.d/70-load-wifi.rules'"
+
+  # Install jointly kernel with component
+  remote.push pc-kernel_*.snap
+  boot_id=$(tests.nested boot-id)
+  remote_chg_id=$(remote.exec sudo snap install --no-wait --dangerous pc-kernel_*.snap "$comp_file")
+  tests.nested wait-for reboot "$boot_id"
+  remote.exec "snap change $remote_chg_id" | NOMATCH Error
+  # Check that the module has been loaded by the udev rule
+  remote.exec ip link show wlan0
+
+  # Install again, but force a failure to check revert
+  boot_id=$(tests.nested boot-id)
+  remote_chg_id=$(remote.exec sudo snap install --no-wait --dangerous pc-kernel_*.snap "$comp_file")
+  remote.retry --wait 1 -n 100 'sudo rm /run/mnt/ubuntu-boot/EFI/ubuntu/try-kernel.efi'
+  tests.nested wait-for reboot "$boot_id"
+  remote.retry --wait 5 -n 60 "snap change $remote_chg_id | MATCH Error"
+  # Module is still loaded
+  remote.exec ip link show wlan0