From 8b022e4a9cbb05d4d8b0a6dfdd6471d00056f373 Mon Sep 17 00:00:00 2001 From: California Sullivan Date: Thu, 6 Jul 2017 18:30:46 -0700 Subject: classes: Add uefi-comboapp bbclass This bbclass pulls in the portion of code that builds a UEFI combo application from meta-refkit to meta-intel. The combo app contains an EFI stub from systemd, which allows you to boot a kernel directly, a kernel, an initramfs, and a command line. This class is compatible as either an EFI_PROVIDER or IMAGE_CLASSES target, and does not include the entire _dsk type image creation seen in meta-refkit. Signed-off-by: California Sullivan Signed-off-by: Saul Wold --- classes/uefi-comboapp.bbclass | 155 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 155 insertions(+) create mode 100644 classes/uefi-comboapp.bbclass (limited to 'classes') diff --git a/classes/uefi-comboapp.bbclass b/classes/uefi-comboapp.bbclass new file mode 100644 index 00000000..77196863 --- /dev/null +++ b/classes/uefi-comboapp.bbclass @@ -0,0 +1,155 @@ +# This class brings a more generic version of the UEFI combo app from refkit to meta-intel. +# It uses a combo file, containing kernel, initramfs and +# command line, presented to the BIOS as UEFI application, by prepending +# it with the efi stub obtained from systemd-boot. + +# Don't add syslinux or build an ISO +PCBIOS_forcevariable = "0" +NOISO_forcevariable = "1" + +# image-live.bbclass will default INITRD_LIVE to the image INITRD_IMAGE creates. +# We want behavior to be consistent whether or not "live" is in IMAGE_FSTYPES, so +# we default INITRD_LIVE to the INITRD_IMAGE as well. +INITRD_IMAGE ?= "core-image-minimal-initramfs" +INITRD_LIVE ?= " ${@ ('${DEPLOY_DIR_IMAGE}/' + d.getVar('INITRD_IMAGE', expand=True) + '-${MACHINE}.cpio.gz') if d.getVar('INITRD_IMAGE', True) else ''}" + +do_uefiapp[depends] += " \ + intel-microcode:do_deploy \ + systemd-boot:do_deploy \ + virtual/kernel:do_deploy \ + " + +# INITRD_IMAGE is added to INITRD_LIVE, which we use to create our initrd, so depend on it if it is set +do_uefiapp[depends] += "${@ '${INITRD_IMAGE}:do_image_complete' if d.getVar('INITRD_IMAGE') else ''}" + +# The image does without traditional bootloader. +# In its place, instead, it uses a single UEFI executable binary, which is +# composed by: +# - an UEFI stub +# The linux kernel can generate a UEFI stub, however the one from systemd-boot can fetch +# the command line from a separate section of the EFI application, avoiding the need to +# rebuild the kernel. +# - the kernel +# - an initramfs (optional) + +python do_uefiapp() { + import glob, re + from subprocess import check_call + + build_dir = d.getVar('B') + deploy_dir_image = d.getVar('DEPLOY_DIR_IMAGE') + + cmdline = '%s/cmdline.txt' % build_dir + linux = '%s/%s' % (deploy_dir_image, d.getVar('KERNEL_IMAGETYPE')) + initrd = '%s/initrd' % build_dir + + stub_path = '%s/linux*.efi.stub' % deploy_dir_image + stub = glob.glob(stub_path)[0] + app = re.sub(r"\S*(ia32|x64)(.efi)\S*", r"boot\1\2", os.path.basename(stub)) + executable = '%s/%s' % (deploy_dir_image, app) + + if d.getVar('INITRD_LIVE'): + with open(initrd, 'wb') as dst: + for cpio in d.getVar('INITRD_LIVE').split(): + with open(cpio, 'rb') as src: + dst.write(src.read()) + initrd_cmd = "--add-section .initrd=%s --change-section-vma .initrd=0x3000000 " % initrd + else: + initrd_cmd = "" + + uuid = d.getVar('DISK_SIGNATURE_UUID') + root = 'root=PARTUUID=%s' % uuid if uuid else '' + + with open(cmdline, 'w') as f: + f.write('%s %s' % (d.getVar('APPEND'), root)) + + objcopy_cmd = ("objcopy " + "--add-section .cmdline=%s --change-section-vma .cmdline=0x30000 " + "--add-section .linux=%s --change-section-vma .linux=0x40000 " + "%s %s %s") % \ + (cmdline, linux, initrd_cmd, stub, executable) + + check_call(objcopy_cmd, shell=True) +} + +do_uefiapp[vardeps] += "APPEND DISK_SIGNATURE_UUID INITRD_LIVE KERNEL_IMAGETYPE" + +do_uefiapp_deploy() { + rm -rf ${IMAGE_ROOTFS}/boot/* + mkdir -p ${IMAGE_ROOTFS}/boot/EFI/BOOT + cp --preserve=timestamps ${DEPLOY_DIR_IMAGE}/boot*.efi ${IMAGE_ROOTFS}/boot/EFI/BOOT/ +} + +do_uefiapp_deploy[depends] += "${PN}:do_uefiapp" + +do_uefiapp_sign() { + if [ -f ${UEFIAPP_SIGNING_KEY} ] && [ -f ${UEFIAPP_SIGNING_CERT} ]; then + for i in `find ${DEPLOY_DIR_IMAGE}/ -name 'boot*.efi'`; do + sbsign --key ${UEFIAPP_SIGNING_KEY} --cert ${UEFIAPP_SIGNING_CERT} $i + sbverify --cert ${UEFIAPP_SIGNING_CERT} $i.signed + mv $i.signed $i + done + fi +} + +do_uefiapp_sign[depends] += "${PN}:do_uefiapp_deploy \ + sbsigntool-native:do_populate_sysroot" + +# This decides when/how we add our tasks to the image +python () { + import os + import hashlib + + secureboot = bb.utils.contains('IMAGE_FEATURES', 'secureboot', True, False, d) + # Ensure that if the signing key or cert change, we rerun the uefiapp process + if secureboot: + for varname in ('UEFIAPP_SIGNING_CERT', 'UEFIAPP_SIGNING_KEY'): + filename = d.getVar(varname) + if filename is None: + bb.fatal('%s is not set.' % varname) + if not os.path.isfile(filename): + bb.fatal('%s=%s is not a file.' % (varname, filename)) + with open(filename, 'rb') as f: + data = f.read() + hash = hashlib.sha256(data).hexdigest() + d.setVar('%s_HASH' % varname, hash) + + # Must reparse and thus rehash on file changes. + bb.parse.mark_dependency(d, filename) + + image_fstypes = d.getVar('IMAGE_FSTYPES', True) + initramfs_fstypes = d.getVar('INITRAMFS_FSTYPES', True) + + # Don't add any of these tasks to initramfs images + if initramfs_fstypes not in image_fstypes: + bb.build.addtask('uefiapp', 'do_image', 'do_rootfs', d) + bb.build.addtask('uefiapp_deploy', 'do_image', 'do_rootfs', d) + # Only sign if secureboot is enabled + if secureboot: + bb.build.addtask('uefiapp_sign', 'do_image', 'do_rootfs', d) +} + +do_uefiapp[vardeps] += "UEFIAPP_SIGNING_CERT_HASH UEFIAPP_SIGNING_KEY_HASH" + +# Legacy hddimg support below this line +efi_hddimg_populate() { + DEST=$1 + cp --preserve=timestamps -r ${DEPLOY_DIR_IMAGE}/boot*.efi ${DEST}/ +} + +build_efi_cfg() { + # The command line is built into the combo app, so this is a null op + : +} + +populate_kernel_append() { + # The kernel and initrd are built into the app, so we don't need these + if [ -f $dest/initrd ]; then + rm $dest/initrd + fi + if [ -f $dest/vmlinuz ]; then + rm $dest/vmlinuz + fi +} + +IMAGE_FEATURES[validitems] += "secureboot" -- cgit v1.2.3-54-g00ecf