Remove 4.4 kernel

We already have 4.9.x, 4.14.x, and 4,19.x as LTS releases.
4.9.x has a longer lifetime as 4.4.x as well and fewer security
fixes can be backported to 4.4.x. Remove it.

Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>

kernel/Makefile

@@ -267,7 +267,6 @@ $(eval $(call kernel,4.14.91,4.14.x,$(EXTRA),$(DEBUG)))
 $(eval $(call kernel,4.14.91,4.14.x,,-dbg))
 $(eval $(call kernel,4.14.78,4.14.x,-rt,))
 $(eval $(call kernel,4.9.148,4.9.x,$(EXTRA),$(DEBUG)))
-$(eval $(call kernel,4.4.169,4.4.x,$(EXTRA),$(DEBUG)))
 
 else ifeq ($(ARCH),aarch64)
 $(eval $(call kernel,4.19.13,4.19.x,$(EXTRA),$(DEBUG)))

test/cases/020_kernel/000_config_4.4.x/test.sh

@@ -1,25 +0,0 @@
-#!/bin/sh
-# SUMMARY: Sanity check on the kernel config file
-# disabled for arm64, no 4.4 build
-# LABELS: amd64
-# REPEAT:
-
-set -e
-
-# Source libraries. Uncomment if needed/defined
-#. "${RT_LIB}"
-. "${RT_PROJECT_ROOT}/_lib/lib.sh"
-
-NAME=kconfig
-
-clean_up() {
-	rm -rf ${NAME}-*
-}
-trap clean_up EXIT
-
-# Test code goes here
-linuxkit build -format kernel+initrd -name "${NAME}" test.yml
-RESULT="$(linuxkit run ${NAME})"
-echo "${RESULT}" | grep -q "suite PASSED"
-
-exit 0

test/cases/020_kernel/000_config_4.4.x/test.yml

@@ -1,15 +0,0 @@
-kernel:
-  image: linuxkit/kernel:4.4.169
-  cmdline: "console=ttyS0 console=ttyAMA0"
-init:
-  - linuxkit/init:c563953a2277eb73a89d89f70e4b6dcdcfebc2d1
-  - linuxkit/runc:83d0edb4552b1a5df1f0976f05f442829eac38fe
-onboot:
-  - name: check-kernel-config
-    image: linuxkit/test-kernel-config:1aaef970b5f70791d74d6f980ad38af4035948f8
-  - name: poweroff
-    image: linuxkit/poweroff:afe8f7dd0d47a7991c54519b0f09124cb8c4e300
-    command: ["/bin/sh", "/poweroff.sh", "3"]
-trust:
-  org:
-    - linuxkit

test/cases/020_kernel/010_kmod_4.4.x/Dockerfile

@@ -1,23 +0,0 @@
-# This Dockerfile extracts the kernel headers from the kernel image
-# and then compiles a simple hello world kernel module against them.
-# In the last stage, it creates a package, which can be used for
-# testing.
-
-FROM linuxkit/kernel:4.4.169 AS ksrc
-
-# Extract headers and compile module
-FROM linuxkit/alpine:3683c9a66cd4da40bd7d6c7da599b2dcd738b559 AS build
-RUN apk add build-base libelf-dev
-
-COPY --from=ksrc /kernel-dev.tar /
-RUN tar xf kernel-dev.tar
-
-WORKDIR /kmod
-COPY ./src/* ./
-RUN make all
-
-# Package
-FROM alpine:3.8
-COPY --from=build /kmod/hello_world.ko /
-COPY check.sh /check.sh
-ENTRYPOINT ["/bin/sh", "/check.sh"]

test/cases/020_kernel/010_kmod_4.4.x/check.sh

@@ -1,15 +0,0 @@
-#!/bin/sh
-function failed {
-	printf "Kernel module test suite FAILED\n"
-	/sbin/poweroff -f
-}
-
-uname -a
-modinfo hello_world.ko || failed
-insmod hello_world.ko || failed
-[ -n "$(dmesg | grep -o 'Hello LinuxKit')" ] || failed
-rmmod hello_world || failed
-
-printf "Kernel module test suite PASSED\n"
-
-/sbin/poweroff -f

test/cases/020_kernel/010_kmod_4.4.x/src/Makefile

@@ -1,6 +0,0 @@
-obj-m += hello_world.o
-KVER=$(shell basename /usr/src/linux-headers-*)
-all:
-	make -C /usr/src/$(KVER) M=$(PWD) modules
-clean:
-	make -C /usr/src/$(KVER) M=$(PWD) clean

test/cases/020_kernel/010_kmod_4.4.x/src/hello_world.c

@@ -1,22 +0,0 @@
-/*  
- * A simple Hello World kernel module 
- */
-#include <linux/module.h>
-#include <linux/kernel.h>
-
-int init_hello(void)
-{
-	printk(KERN_INFO "Hello LinuxKit\n");
-	return 0;
-}
-
-void exit_hello(void)
-{
-	printk(KERN_INFO "Goodbye LinuxKit.\n");
-}
-
-module_init(init_hello);
-module_exit(exit_hello);
-MODULE_AUTHOR("Rolf Neugebauer <rolf.neugebauer@docker.com>");
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("A simple Hello World kernel module for testing");

test/cases/020_kernel/010_kmod_4.4.x/test.sh

@@ -1,31 +0,0 @@
-#!/bin/sh
-# SUMMARY: Test build and insertion of kernel modules
-# LABELS:
-# REPEAT:
-
-set -e
-
-# Source libraries. Uncomment if needed/defined
-#. "${RT_LIB}"
-. "${RT_PROJECT_ROOT}/_lib/lib.sh"
-
-NAME=kmod
-IMAGE_NAME=kmod-test
-
-clean_up() {
-	docker rmi ${IMAGE_NAME} || true
-	rm -rf ${NAME}-*
-}
-trap clean_up EXIT
-
-# Make sure we have the latest kernel image
-docker pull linuxkit/kernel:4.4.169
-# Build a package
-docker build -t ${IMAGE_NAME} .
-
-# Build and run a LinuxKit image with kernel module (and test script)
-linuxkit build -format kernel+initrd -name "${NAME}" test.yml
-RESULT="$(linuxkit run ${NAME})"
-echo "${RESULT}" | grep -q "Hello LinuxKit"
-
-exit 0

test/cases/020_kernel/010_kmod_4.4.x/test.yml

@@ -1,20 +0,0 @@
-kernel:
-  image: linuxkit/kernel:4.4.169
-  cmdline: "console=ttyS0 console=ttyAMA0"
-init:
-  - linuxkit/init:c563953a2277eb73a89d89f70e4b6dcdcfebc2d1
-  - linuxkit/runc:83d0edb4552b1a5df1f0976f05f442829eac38fe
-onboot:
-  - name: check
-    image: kmod-test
-    binds:
-     - /dev:/dev
-     - /lib/modules:/lib/modules
-    capabilities:
-     - all
-  - name: poweroff
-    image: linuxkit/poweroff:afe8f7dd0d47a7991c54519b0f09124cb8c4e300
-    command: ["/bin/sh", "/poweroff.sh", "3"]
-trust:
-  org:
-    - linuxkit