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/*
* Copyright (C) 2023 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "host/commands/assemble_cvd/disk/disk.h"
#include <string>
#include <fruit/fruit.h>
#include <gflags/gflags.h>
#include "common/libs/utils/files.h"
#include "host/commands/assemble_cvd/boot_image_utils.h"
#include "host/commands/assemble_cvd/vendor_dlkm_utils.h"
#include "host/libs/avb/avb.h"
#include "host/libs/config/cuttlefish_config.h"
#include "host/libs/config/feature.h"
#include "host/libs/vm_manager/gem5_manager.h"
namespace cuttlefish {
using vm_manager::Gem5Manager;
class KernelRamdiskRepackerImpl : public KernelRamdiskRepacker {
public:
INJECT(KernelRamdiskRepackerImpl(
const CuttlefishConfig& config,
const CuttlefishConfig::InstanceSpecific& instance,
const Avb& avb))
: config_(config), instance_(instance), avb_(avb) {}
// SetupFeature
std::string Name() const override { return "KernelRamdiskRepacker"; }
std::unordered_set<SetupFeature*> Dependencies() const override { return {}; }
bool Enabled() const override {
// If we are booting a protected VM, for now, assume that image repacking
// isn't trusted. Repacking requires resigning the image and keys from an
// android host aren't trusted.
return !instance_.protected_vm();
}
protected:
static bool RebuildDlkmAndVbmeta(const std::string& build_dir,
const std::string& partition_name,
const std::string& output_image,
const std::string& vbmeta_image) {
// TODO(b/149866755) For now, we assume that vendor_dlkm is ext4. Add
// logic to handle EROFS once the feature stablizes.
const auto tmp_output_image = output_image + ".tmp";
if (!BuildDlkmImage(build_dir, false, partition_name, tmp_output_image)) {
LOG(ERROR) << "Failed to build `" << partition_name << "` image from "
<< build_dir;
return false;
}
if (!MoveIfChanged(tmp_output_image, output_image)) {
return false;
}
if (!BuildVbmetaImage(output_image, vbmeta_image)) {
LOG(ERROR) << "Failed to rebuild vbmeta vendor.";
return false;
}
return true;
}
bool RepackSuperAndVbmeta(const std::string& superimg_build_dir,
const std::string& vendor_dlkm_build_dir,
const std::string& system_dlkm_build_dir,
const std::string& ramdisk_path) {
const auto ramdisk_stage_dir = instance_.instance_dir() + "/ramdisk_staged";
if (!SplitRamdiskModules(ramdisk_path, ramdisk_stage_dir,
vendor_dlkm_build_dir, system_dlkm_build_dir)) {
LOG(ERROR) << "Failed to move ramdisk modules to vendor_dlkm";
return false;
}
const auto new_vendor_dlkm_img =
superimg_build_dir + "/vendor_dlkm_repacked.img";
if (!RebuildDlkmAndVbmeta(vendor_dlkm_build_dir, "vendor_dlkm",
new_vendor_dlkm_img,
instance_.new_vbmeta_vendor_dlkm_image())) {
LOG(ERROR) << "Failed to build vendor_dlkm image from "
<< vendor_dlkm_build_dir;
return false;
}
const auto new_system_dlkm_img =
superimg_build_dir + "/system_dlkm_repacked.img";
if (!RebuildDlkmAndVbmeta(system_dlkm_build_dir, "system_dlkm",
new_system_dlkm_img,
instance_.new_vbmeta_system_dlkm_image())) {
LOG(ERROR) << "Failed to build system_dlkm image from "
<< system_dlkm_build_dir;
return false;
}
const auto new_super_img = instance_.new_super_image();
if (!Copy(instance_.super_image(), new_super_img)) {
PLOG(ERROR) << "Failed to copy super image " << instance_.super_image()
<< " to " << new_super_img;
return false;
}
if (!RepackSuperWithPartition(new_super_img, new_vendor_dlkm_img,
"vendor_dlkm")) {
LOG(ERROR) << "Failed to repack super image with new vendor dlkm image.";
return false;
}
if (!RepackSuperWithPartition(new_super_img, new_system_dlkm_img,
"system_dlkm")) {
LOG(ERROR) << "Failed to repack super image with new system dlkm image.";
return false;
}
return true;
}
Result<void> ResultSetup() override {
CF_EXPECTF(FileHasContent(instance_.boot_image()), "File not found: {}",
instance_.boot_image());
// The init_boot partition is be optional for testing boot.img
// with the ramdisk inside.
if (!FileHasContent(instance_.init_boot_image())) {
LOG(WARNING) << "File not found: " << instance_.init_boot_image();
}
CF_EXPECTF(FileHasContent(instance_.vendor_boot_image()),
"File not found: {}", instance_.vendor_boot_image());
// Repacking a boot.img doesn't work with Gem5 because the user must always
// specify a vmlinux instead of an arm64 Image, and that file can be too
// large to be repacked. Skip repack of boot.img on Gem5, as we need to be
// able to extract the ramdisk.img in a later stage and so this step must
// not fail (..and the repacked kernel wouldn't be used anyway).
if (instance_.kernel_path().size() &&
config_.vm_manager() != VmmMode::kGem5) {
CF_EXPECT(RepackBootImage(avb_, instance_.kernel_path(), instance_.boot_image(),
instance_.new_boot_image(), instance_.instance_dir()),
"Failed to regenerate the boot image with the new kernel");
}
if (instance_.kernel_path().size() || instance_.initramfs_path().size()) {
const std::string new_vendor_boot_image_path =
instance_.new_vendor_boot_image();
// Repack the vendor boot images if kernels and/or ramdisks are passed in.
if (instance_.initramfs_path().size()) {
const auto superimg_build_dir = instance_.instance_dir() + "/superimg";
const auto ramdisk_repacked =
instance_.instance_dir() + "/ramdisk_repacked";
CF_EXPECTF(Copy(instance_.initramfs_path(), ramdisk_repacked),
"Failed to copy {} to {}", instance_.initramfs_path(),
ramdisk_repacked);
const auto vendor_dlkm_build_dir = superimg_build_dir + "/vendor_dlkm";
const auto system_dlkm_build_dir = superimg_build_dir + "/system_dlkm";
CF_EXPECT(
RepackSuperAndVbmeta(superimg_build_dir, vendor_dlkm_build_dir,
system_dlkm_build_dir, ramdisk_repacked));
bool success = RepackVendorBootImage(
ramdisk_repacked, instance_.vendor_boot_image(),
new_vendor_boot_image_path, config_.assembly_dir(),
instance_.bootconfig_supported());
if (!success) {
LOG(ERROR) << "Failed to regenerate the vendor boot image with the "
"new ramdisk";
} else {
// This control flow implies a kernel with all configs built in.
// If it's just the kernel, repack the vendor boot image without a
// ramdisk.
CF_EXPECT(
RepackVendorBootImageWithEmptyRamdisk(
instance_.vendor_boot_image(), new_vendor_boot_image_path,
config_.assembly_dir(), instance_.bootconfig_supported()),
"Failed to regenerate the vendor boot image without a ramdisk");
}
}
}
return {};
}
private:
const CuttlefishConfig& config_;
const CuttlefishConfig::InstanceSpecific& instance_;
const Avb& avb_;
};
fruit::Component<fruit::Required<const CuttlefishConfig,
const CuttlefishConfig::InstanceSpecific,
const Avb>,
KernelRamdiskRepacker>
KernelRamdiskRepackerComponent() {
return fruit::createComponent()
.addMultibinding<SetupFeature, KernelRamdiskRepackerImpl>()
.bind<KernelRamdiskRepacker, KernelRamdiskRepackerImpl>();
}
} // namespace cuttlefish
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