Replace mdev with udev: (#263)

## Description

<!--- Please describe what this PR is going to change -->
This gets us persistent network interface naming.

@rpardini , you did a bunch of work creating
`images/hook-mdev/persistent-storage.sh`, when/if you have some cycles,
would you mind checking this out and verifying if you see the same
functionality?

## Why is this needed

<!--- Link to issue you have raised -->

Fixes: #

## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->


## How are existing users impacted? What migration steps/scripts do we
need?

<!--- Fixes a bug, unblocks installation, removes a component of the
stack etc -->
<!--- Requires a DB migration script, etc. -->


## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

Author: jacobweinstock

.gitignore

@@ -4,7 +4,6 @@ dist/
 .env
 !/hook-bootkit/
 !/hook-docker/
-!/hook-mdev/
 hook*.*.yaml
 !linuxkit-templates
 out/

README.md

@@ -150,7 +150,7 @@ The most important environment variables are:
 
 - There's a distributed GitHub Actions build workflow `"matrix"`.
   - The bash build system produces JSON objects that drive the matrix stages:
-    - One matrix is per-arch, and builds all the containers whose source is hosted in this repo (bootkit, docker, mdev)
+    - One matrix is per-arch, and builds all the containers whose source is hosted in this repo (bootkit, docker, udev)
     - Second matrix is per-flavor(/kernel), and builds the kernel
     - Third matrix, depending on the other two, is per-flavor(/kernel), and builds Hook itself (via LinuxKit) and prepares a .tar.gz into GH artifacts
 

bash/hook-lk-containers.sh

@@ -9,7 +9,7 @@ function build_all_hook_linuxkit_containers() {
 	# # NOTE: linuxkit containers must be in the images/ directory
 	build_hook_linuxkit_container hook-bootkit "HOOK_CONTAINER_BOOTKIT_IMAGE"
 	build_hook_linuxkit_container hook-docker "HOOK_CONTAINER_DOCKER_IMAGE"
-	build_hook_linuxkit_container hook-mdev "HOOK_CONTAINER_MDEV_IMAGE"
+	build_hook_linuxkit_container hook-udev "HOOK_CONTAINER_UDEV_IMAGE"
 	build_hook_linuxkit_container hook-containerd "HOOK_CONTAINER_CONTAINERD_IMAGE"
 	build_hook_linuxkit_container hook-runc "HOOK_CONTAINER_RUNC_IMAGE"
 	build_hook_linuxkit_container hook-embedded "HOOK_CONTAINER_EMBEDDED_IMAGE"

bash/json-matrix.sh

@@ -21,7 +21,7 @@
 # - CI_RUNNER_LK is the runner to use for all linuxkit builds
 # - CI_RUNNER_AMD64 is the runner to use for all AMD64 things
 # - CI_RUNNER is the runner to use for everything
-## LK containers (hook-bootkit, hook-docker, hook-mdev): (3):
+## LK containers (hook-bootkit, hook-docker, hook-udev): (3):
 # - CI_RUNNER_LK_CONTAINERS_AMD64 is the runner to use for amd64 linuxkit containers builds
 # - CI_RUNNER_LK_CONTAINERS is the runner to use for all linuxkit containers builds
 # - CI_RUNNER_AMD64 is the runner to use for all AMD64 things

files/dhcp.sh

@@ -9,11 +9,11 @@ set -x
 
 run_dhcp_client() {
 	one_shot="$1"
-	al="eth*"
+	al="en*"
 
 	vlan_id=$(sed -n 's/.* vlan_id=\([0-9]*\).*/\1/p' /proc/cmdline)
 	if [ -n "$vlan_id" ]; then
-		al="eth*.*"
+		al="en*.*"
 	fi
 
 	if [ "$one_shot" = "true" ]; then

files/dhcpcd.conf

@@ -1,4 +1,4 @@
-# Default values for dhcpcd from linuxkit/dhcpcd:v0.8 with `allowinterfaces eth*` removed
+# Default values for dhcpcd from linuxkit/dhcpcd:v0.8 with `allowinterfaces en*` removed
 # This allows the `--allowinterfaces` flag of dhcpcd to specify the allowinterfaces.
 hostname
 clientid

files/vlan.sh

@@ -71,8 +71,8 @@ function add_vlan_interface() {
 			ifname="$(get_interface_name ${hw_addr})"
 			echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', found interface: '${ifname}'" >&2
 		else
-			echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no hw_addr found in kernel commandline; default ifname to eth0." >&2
-			ifname="eth0"
+			echo "VLAN handling - vlan_id: '${vlan_id}', hw_addr: '${hw_addr}', no hw_addr found in kernel commandline; cannot set vlan interface." >&2
+			ifname=""
 		fi
 
 		if [ -n "$ifname" ]; then

images/hook-mdev/Dockerfile

@@ -0,0 +1,9 @@
+FROM debian:12-slim AS base
+
+RUN DEBIAN_FRONTEND=noninteractive apt update && \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends udev && \
+    apt-get clean autoclean && \
+    apt-get autoremove --yes && \
+    rm -rf /var/lib/apt /var/lib/dpkg /var/lib/cache /var/lib/log /var/cache/* /usr/lib/apt/* /usr/share/*
+
+CMD ["/etc/init.d/udev", "start"]