1 // 2 // Copyright (C) 2015 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 #ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_PAYLOAD_GENERATION_CONFIG_H_ 18 #define UPDATE_ENGINE_PAYLOAD_GENERATOR_PAYLOAD_GENERATION_CONFIG_H_ 19 20 #include <cstddef> 21 22 #include <memory> 23 #include <string> 24 #include <vector> 25 26 #include <brillo/key_value_store.h> 27 28 #include "update_engine/payload_consumer/payload_constants.h" 29 #include "update_engine/payload_generator/filesystem_interface.h" 30 #include "update_engine/update_metadata.pb.h" 31 32 namespace chromeos_update_engine { 33 34 struct PostInstallConfig { 35 // Whether the postinstall config is empty. 36 bool IsEmpty() const; 37 38 // Whether this partition carries a filesystem with post-install program that 39 // must be run to finalize the update process. 40 bool run = false; 41 42 // The path to the post-install program relative to the root of this 43 // filesystem. 44 std::string path; 45 46 // The filesystem type used to mount the partition in order to run the 47 // post-install program. 48 std::string filesystem_type; 49 }; 50 51 struct PartitionConfig { 52 explicit PartitionConfig(std::string name) : name(name) {} 53 54 // Returns whether the PartitionConfig is not an empty image and all the 55 // fields are set correctly to a valid image file. 56 bool ValidateExists() const; 57 58 // Open then filesystem stored in this partition and stores it in 59 // |fs_interface|. Returns whether opening the filesystem worked. 60 bool OpenFilesystem(); 61 62 // The path to the partition file. This can be a regular file or a block 63 // device such as a loop device. 64 std::string path; 65 66 // The size of the data in |path|. If rootfs verification is used (verity) 67 // this value should match the size of the verity device for the rootfs, and 68 // the size of the whole kernel. This value could be smaller than the 69 // partition and is the size of the data update_engine assumes verified for 70 // the source image, and the size of that data it should generate for the 71 // target image. 72 uint64_t size = 0; 73 74 // The FilesystemInterface implementation used to access this partition's 75 // files. 76 std::unique_ptr<FilesystemInterface> fs_interface; 77 78 std::string name; 79 80 PostInstallConfig postinstall; 81 }; 82 83 // The ImageConfig struct describes a pair of binaries kernel and rootfs and the 84 // metadata associated with the image they are part of, like build number, size, 85 // etc. 86 struct ImageConfig { 87 // Returns whether the ImageConfig is an empty image. 88 bool ValidateIsEmpty() const; 89 90 // Load |rootfs_size| and |kernel.size| from the respective image files. For 91 // the kernel, the whole |kernel.path| file is assumed. For the rootfs, the 92 // size is detected from the filesystem. 93 // Returns whether the image size was properly detected. 94 bool LoadImageSize(); 95 96 // Load postinstall config from a key value store. 97 bool LoadPostInstallConfig(const brillo::KeyValueStore& store); 98 99 // Returns whether the |image_info| field is empty. 100 bool ImageInfoIsEmpty() const; 101 102 // The ImageInfo message defined in the update_metadata.proto file describes 103 // the metadata of the image. 104 ImageInfo image_info; 105 106 // The updated partitions. 107 std::vector<PartitionConfig> partitions; 108 }; 109 110 struct PayloadVersion { 111 PayloadVersion() : PayloadVersion(0, 0) {} 112 PayloadVersion(uint64_t major_version, uint32_t minor_version); 113 114 // Returns whether the PayloadVersion is valid. 115 bool Validate() const; 116 117 // Return whether the passed |operation| is allowed by this payload. 118 bool OperationAllowed(InstallOperation_Type operation) const; 119 120 // Whether this payload version is a delta payload. 121 bool IsDelta() const; 122 123 // Tells whether the update is done in-place, that is, whether the operations 124 // read and write from the same partition. 125 bool InplaceUpdate() const; 126 127 // The major version of the payload. 128 uint64_t major; 129 130 // The minor version of the payload. 131 uint32_t minor; 132 133 // Wheter the IMGDIFF operation is allowed based on the available compressor 134 // in the delta_generator and the one supported by the target. 135 bool imgdiff_allowed = false; 136 }; 137 138 // The PayloadGenerationConfig struct encapsulates all the configuration to 139 // build the requested payload. This includes information about the old and new 140 // image as well as the restrictions applied to the payload (like minor-version 141 // and full/delta payload). 142 struct PayloadGenerationConfig { 143 // Returns whether the PayloadGenerationConfig is valid. 144 bool Validate() const; 145 146 // Image information about the new image that's the target of this payload. 147 ImageConfig target; 148 149 // Image information pertaining the old image, if any. This is only valid 150 // if is_full is false, so we are requested a delta payload. 151 ImageConfig source; 152 153 // Wheter the requested payload is a delta payload. 154 bool is_delta = false; 155 156 // The major/minor version of the payload. 157 PayloadVersion version; 158 159 // The size of the rootfs partition, that not necessarily is the same as the 160 // filesystem in either source or target version, since there is some space 161 // after the partition used to store the verity hashes and or the bootcache. 162 uint64_t rootfs_partition_size = 0; 163 164 // The |hard_chunk_size| is the maximum size that a single operation should 165 // write in the destination. Operations bigger than chunk_size should be 166 // split. A value of -1 means no hard chunk size limit. A very low limit 167 // means more operations, and less of a chance to reuse the data. 168 ssize_t hard_chunk_size = -1; 169 170 // The |soft_chunk_size| is the preferred chunk size to use when there's no 171 // significant impact to the operations. For example, REPLACE, MOVE and 172 // SOURCE_COPY operations are not significantly impacted by the chunk size, 173 // except for a few bytes overhead in the manifest to describe extra 174 // operations. On the other hand, splitting BSDIFF operations impacts the 175 // payload size since it is not possible to use the redundancy *between* 176 // chunks. 177 size_t soft_chunk_size = 2 * 1024 * 1024; 178 179 // TODO(deymo): Remove the block_size member and maybe replace it with a 180 // minimum alignment size for blocks (if needed). Algorithms should be able to 181 // pick the block_size they want, but for now only 4 KiB is supported. 182 183 // The block size used for all the operations in the manifest. 184 size_t block_size = 4096; 185 }; 186 187 } // namespace chromeos_update_engine 188 189 #endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_PAYLOAD_GENERATION_CONFIG_H_ 190
