Deprecate linux-kvm usage

Remove kvm-image altogether.

Previously for minimal image replace_kernel function replaced virtual
images with kvm, and called force_boot_without_initramfs. Now simply
call force_boot_without_initramfs for minimal image without replacing
kernel flavour.

This also means minimal images can now be built for arm64 and armhf.

Signed-off-by: Dimitri John Ledkov <dimitri.ledkov@canonical.com>

live-build/ubuntu-cpc/hooks.d/base/disk-image-uefi.binary

@@ -485,10 +485,9 @@ EOF
         chroot mountpoint grub-install --target=i386-pc "${loop_device}"
     fi
 
-    # Use the linux-kvm kernel for minimal images where available
-    # linux-kvm currently only exists for amd64
-    if [ "${SUBPROJECT:-}" = "minimized" ] && [ "$ARCH" = "amd64" ]; then
-        replace_kernel mountpoint linux-kvm
+    # Use initrdless boot for minimal images
+    if [ "${SUBPROJECT:-}" = "minimized" ]; then
+        force_boot_without_initramfs ${mountpoint}
     fi
 
     # This call to rewrite the debian package manifest is added here to capture

live-build/ubuntu-cpc/hooks.d/base/disk-image.binary

@@ -131,10 +131,9 @@ if [ "${should_install_grub}" -eq 1 ]; then
     rm mountpoint/tmp/device.map
 fi
 
-# Use the linux-kvm kernel for minimal images where available
-# linux-kvm currently only exists for amd64
-if [ "${SUBPROJECT:-}" = "minimized" ] && [ "$ARCH" = "amd64" ]; then
-    replace_kernel mountpoint linux-kvm
+# Use initrdless boot for minimal images
+if [ "${SUBPROJECT:-}" = "minimized" ]; then
+    force_boot_without_initramfs ${mountpoint}
 fi
 
 if [ "$ARCH" = "s390x" ]; then

live-build/ubuntu-cpc/hooks.d/base/kvm-image.binary

@@ -1,63 +0,0 @@
-#!/bin/bash -eux
-# vi: ts=4 expandtab
-#
-# Generate KVM image
-#
-
-echo "Building KVM image"
-IMAGE_STR="# CLOUD_IMG: This file was created/modified by the Cloud Image build process"
-case ${SUBPROJECT:-} in
-    minimized)
-        echo "Skipping minimized $0 builds"
-        exit 0
-        ;;
-    *)
-        ;;
-esac
-
-# Only allow amd64 builds for now
-case $ARCH in
-        amd64)
-            ;;
-        *)
-            echo "Linux KVM images are not supported for $ARCH yet.";
-            exit 0;;
-esac
-
-. config/functions
-
-mount_d=$(mktemp -d)
-
-create_derivative uefi kvm #sets ${derivative_img}
-mount_disk_image ${derivative_img} ${mount_d}
-
-# unmount disk image and remove created folders on exit
-# even though we unmount manually before we convert to
-# qcow2, we have this here just in case we error out before
-# that step
-cleanup_kvm() {
-    if [ -d "$mount_d" ]; then
-        umount_disk_image "$mount_d"
-    fi
-    rm -rf ${mount_d} ${derivative_img}
-}
-trap cleanup_kvm EXIT
-
-
-divert_grub "${mount_d}"
-replace_kernel ${mount_d} "linux-kvm"
-chroot "${mount_d}" update-grub
-undivert_grub "${mount_d}"
-
-# Remove indices 
-env DEBIAN_FRONTEND=noninteractive chroot "${mount_d}" apt-get \
-    clean
-
-create_manifest ${mount_d} livecd.ubuntu-cpc.disk-kvm.manifest
-
-# unmount disk image to prevent corruption
-# and remove it so the trap doesn't try to unmount it again
-umount_disk_image ${mount_d}
-rm -rf ${mount_d}
-
-convert_to_qcow2 ${derivative_img} livecd.ubuntu-cpc.disk-kvm.img

live-build/ubuntu-cpc/hooks.d/base/series/kvm

@@ -1,5 +0,0 @@
-depends disk-image
-base/kvm-image.binary
-provides livecd.ubuntu-cpc.disk-kvm.img
-provides livecd.ubuntu-cpc.disk-kvm.manifest
-provides livecd.ubuntu-cpc.disk-kvm.filelist