extensions: image-output-vhdx: add output for dynamic .vhdx (in a zip…

… file, to avoid sparseness errors)

- new VHDX output format (for generic Hyper-V on Windows 10/11/2019/etc)
- it is always stored (no compression) in a .zip file, to avoid sparseness errors
- when building, transfer the .zip file over to Windows, and uncompress it there (not on WSL2 itself/Linux/other machine)

extensions/image-output-vhdx.sh

@@ -0,0 +1,58 @@
+enable_extension "image-output-qcow2"
+
+#### *run before installing host dependencies*
+function add_host_dependencies__vhdx_host_deps() {
+	declare -g EXTRA_BUILD_DEPS="${EXTRA_BUILD_DEPS} qemu-utils"
+}
+
+#### *allow extensions to prepare their own config, after user config is done*
+function extension_prepare_config__prepare_vhdx_config() {
+	declare -g VHDX_KEEP_QCOW2="${VHDX_KEEP_QCOW2:-no}" # keep the qcow2 image after conversion to OVF
+	declare -g VHDX_KEEP_IMG="${VHDX_KEEP_IMG:-no}"     # keep the .img image after conversion to OVF
+}
+
+#### *custom post build hook*
+function post_build_image__920_create_vhdx() {
+	local VHDX_VM_NAME="${VHDX_VM_NAME:-${version}}"          # The name of the VM when imported into Fusion/Player/Workstation; no spaces please
+	local original_qcow2_image="${QCOW2_IMAGE_FILE}"          # Original from qcow2 output extension
+	local temp_qcow2_image="${DESTIMG}/${version}_temp.qcow2" # shadow qcow2 for resize
+
+	local base_hyperv_dir="${VHDX_VM_NAME}_hyperv"                                 # directory for vmx format, name only
+	local full_hyperv_dirname="${DESTIMG}/${base_hyperv_dir}"                      # directory for vmx format, full path
+	local full_pwsh_filename="${full_hyperv_dirname}/${VHDX_VM_NAME}.createVM.ps1" # vmx in vmx format dir
+	local base_file_vhdx="${VHDX_VM_NAME}-disk1-efi-rootfs.vhdx"                   # target temp vhdx (filename)
+	local full_file_vhdx="${full_hyperv_dirname}/${base_file_vhdx}"                # target temp vhdx (full path)
+	local final_vmx_zip_file="${DESTIMG}/${VHDX_VM_NAME}.hyperv.zip"               # final vmx zip artifact - defaults to UEFI boot
+	mkdir -p "${full_hyperv_dirname}"                                              # pre-create it
+
+	display_alert "Converting image to Microsoft Hyper-V VHDX format" "${EXTENSION}" "info"
+	run_host_command_logged qemu-img create -f qcow2 -F qcow2 -b "${original_qcow2_image}" "${temp_qcow2_image}"             # create a new, temporary, qcow2 with the original as backing image
+	run_host_command_logged qemu-img resize "${temp_qcow2_image}" +47G                                                       # resize the temporary
+	run_host_command_logged qemu-img convert -f qcow2 -O vhdx -o subformat=dynamic "${temp_qcow2_image}" "${full_file_vhdx}" # convert the big temp to vhdx
+	run_host_command_logged rm -vf "${temp_qcow2_image}"                                                                     # remove the temporary large qcow2, free space
+	if [[ "${VHDX_KEEP_QCOW2}" != "yes" ]]; then                                                                             # check if told to keep the qcow2 image
+		display_alert "Discarding qcow2 image after" "conversion to VHDX" "debug"                                               # debug
+		run_host_command_logged rm -vf "${original_qcow2_image}"                                                                # remove the original qcow2, free space
+	fi                                                                                                                       # /check
+	if [[ "${VHDX_KEEP_IMG}" != "yes" ]]; then                                                                               # check if told to keep the img image
+		display_alert "Discarding .img image after" "conversion to VHDX" "debug"                                                # debug
+		run_host_command_logged rm -vf "${DESTIMG}/${version}.img" "${DESTIMG}/${version}.img.txt"                              # remove the original .img and .img.txt if there
+	fi                                                                                                                       # /check
+	run_host_command_logged qemu-img info "${full_file_vhdx}"                                                                # show info
+
+	display_alert "Creating powershell script file" "${EXTENSION}" "info"
+
+	cat <<- POWERSHELL > "${full_pwsh_filename}"
+		# some powershell stuff @TODO
+	POWERSHELL
+
+	# Now wrap the .vmx in a zip, with minimal compression. (release will .zst it later)
+	display_alert "Zipping/storing Hyper-V VHDX" "${EXTENSION}" "info"
+	cd "${DESTIMG}" || false
+	run_host_command_logged zip -0 "${final_vmx_zip_file}" "${base_hyperv_dir}"/*
+	cd - || false
+
+	display_alert "Done, cleaning up" "${EXTENSION}" "info"
+	rm -rf "${full_hyperv_dirname}"
+	return 0
+}