1 /*
2 * Copyright (C) 2023 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "host/commands/assemble_cvd/disk/disk.h"
18
19 #include <memory>
20 #include <string>
21 #include <unordered_set>
22
23 #include "common/libs/fs/shared_buf.h"
24 #include "common/libs/fs/shared_fd.h"
25 #include "common/libs/utils/files.h"
26 #include "common/libs/utils/result.h"
27 #include "common/libs/utils/size_utils.h"
28 #include "host/commands/assemble_cvd/bootconfig_args.h"
29 #include "host/libs/avb/avb.h"
30 #include "host/libs/config/cuttlefish_config.h"
31 #include "host/libs/config/data_image.h"
32 #include "host/libs/config/feature.h"
33 #include "host/libs/config/known_paths.h"
34 #include "host/libs/vm_manager/gem5_manager.h"
35
36 namespace cuttlefish {
37
GeneratePersistentBootconfig(const CuttlefishConfig & config,const CuttlefishConfig::InstanceSpecific & instance)38 Result<void> GeneratePersistentBootconfig(
39 const CuttlefishConfig& config,
40 const CuttlefishConfig::InstanceSpecific& instance) {
41 if (instance.protected_vm()) {
42 return {};
43 }
44 // Cuttlefish for the time being won't be able to support OTA from a
45 // non-bootconfig kernel to a bootconfig-kernel (or vice versa) IF the
46 // device is stopped (via stop_cvd). This is rarely an issue since OTA
47 // testing run on cuttlefish is done within one launch cycle of the device.
48 // If this ever becomes an issue, this code will have to be rewritten.
49 if (!instance.bootconfig_supported()) {
50 return {};
51 }
52 const auto bootconfig_path = instance.persistent_bootconfig_path();
53 if (!FileExists(bootconfig_path)) {
54 CF_EXPECT(CreateBlankImage(bootconfig_path, 1 /* mb */, "none"),
55 "Failed to create image at " << bootconfig_path);
56 }
57
58 auto bootconfig_fd = SharedFD::Open(bootconfig_path, O_RDWR);
59 CF_EXPECT(bootconfig_fd->IsOpen(),
60 "Unable to open bootconfig file: " << bootconfig_fd->StrError());
61
62 const auto bootconfig_args =
63 CF_EXPECT(BootconfigArgsFromConfig(config, instance));
64 const auto bootconfig =
65 CF_EXPECT(BootconfigArgsString(bootconfig_args, "\n")) + "\n";
66
67 LOG(DEBUG) << "bootconfig size is " << bootconfig.size();
68 ssize_t bytesWritten = WriteAll(bootconfig_fd, bootconfig);
69 CF_EXPECT(WriteAll(bootconfig_fd, bootconfig) == bootconfig.size(),
70 "Failed to write bootconfig to \"" << bootconfig_path << "\"");
71 LOG(DEBUG) << "Bootconfig parameters from vendor boot image and config are "
72 << ReadFile(bootconfig_path);
73
74 CF_EXPECT(bootconfig_fd->Truncate(bootconfig.size()) == 0,
75 "`truncate --size=" << bootconfig.size() << " bytes "
76 << bootconfig_path
77 << "` failed:" << bootconfig_fd->StrError());
78
79 if (config.vm_manager() == VmmMode::kGem5) {
80 const off_t bootconfig_size_bytes_gem5 =
81 AlignToPowerOf2(bytesWritten, PARTITION_SIZE_SHIFT);
82 CF_EXPECT(bootconfig_fd->Truncate(bootconfig_size_bytes_gem5) == 0);
83 bootconfig_fd->Close();
84 } else {
85 bootconfig_fd->Close();
86 const off_t bootconfig_size_bytes = AlignToPowerOf2(
87 kMaxAvbMetadataSize + bootconfig.size(), PARTITION_SIZE_SHIFT);
88
89 std::unique_ptr<Avb> avbtool = GetDefaultAvb();
90 CF_EXPECT(avbtool->AddHashFooter(bootconfig_path, "bootconfig",
91 bootconfig_size_bytes));
92 }
93 return {};
94 }
95
96 } // namespace cuttlefish
97