437 lines
14 KiB
Python
Executable file
437 lines
14 KiB
Python
Executable file
#!/usr/bin/env python
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#
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# Copyright (C) 2011 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Build image output_image_file from input_directory and properties_file.
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Usage: build_image input_directory properties_file output_image_file
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"""
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import os
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import os.path
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import subprocess
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import sys
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import commands
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import shutil
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import tempfile
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FIXED_SALT = "aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7"
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def RunCommand(cmd):
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""" Echo and run the given command
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Args:
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cmd: the command represented as a list of strings.
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Returns:
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The exit code.
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"""
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print "Running: ", " ".join(cmd)
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p = subprocess.Popen(cmd)
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p.communicate()
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return p.returncode
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def GetVerityTreeSize(partition_size):
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cmd = "build_verity_tree -s %d"
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cmd %= partition_size
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status, output = commands.getstatusoutput(cmd)
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if status:
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print output
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return False, 0
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return True, int(output)
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def GetVerityMetadataSize(partition_size):
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cmd = "system/extras/verity/build_verity_metadata.py -s %d"
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cmd %= partition_size
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status, output = commands.getstatusoutput(cmd)
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if status:
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print output
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return False, 0
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return True, int(output)
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def AdjustPartitionSizeForVerity(partition_size):
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"""Modifies the provided partition size to account for the verity metadata.
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This information is used to size the created image appropriately.
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Args:
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partition_size: the size of the partition to be verified.
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Returns:
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The size of the partition adjusted for verity metadata.
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"""
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success, verity_tree_size = GetVerityTreeSize(partition_size)
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if not success:
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return 0
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success, verity_metadata_size = GetVerityMetadataSize(partition_size)
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if not success:
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return 0
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return partition_size - verity_tree_size - verity_metadata_size
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def BuildVerityTree(sparse_image_path, verity_image_path, prop_dict):
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cmd = "build_verity_tree -A %s %s %s" % (
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FIXED_SALT, sparse_image_path, verity_image_path)
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print cmd
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status, output = commands.getstatusoutput(cmd)
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if status:
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print "Could not build verity tree! Error: %s" % output
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return False
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root, salt = output.split()
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prop_dict["verity_root_hash"] = root
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prop_dict["verity_salt"] = salt
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return True
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def BuildVerityMetadata(image_size, verity_metadata_path, root_hash, salt,
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block_device, signer_path, key):
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cmd_template = (
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"system/extras/verity/build_verity_metadata.py %s %s %s %s %s %s %s")
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cmd = cmd_template % (image_size, verity_metadata_path, root_hash, salt,
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block_device, signer_path, key)
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print cmd
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status, output = commands.getstatusoutput(cmd)
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if status:
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print "Could not build verity metadata! Error: %s" % output
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return False
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return True
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def Append2Simg(sparse_image_path, unsparse_image_path, error_message):
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"""Appends the unsparse image to the given sparse image.
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Args:
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sparse_image_path: the path to the (sparse) image
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unsparse_image_path: the path to the (unsparse) image
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Returns:
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True on success, False on failure.
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"""
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cmd = "append2simg %s %s"
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cmd %= (sparse_image_path, unsparse_image_path)
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print cmd
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status, output = commands.getstatusoutput(cmd)
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if status:
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print "%s: %s" % (error_message, output)
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return False
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return True
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def BuildVerifiedImage(data_image_path, verity_image_path,
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verity_metadata_path):
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if not Append2Simg(data_image_path, verity_metadata_path,
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"Could not append verity metadata!"):
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return False
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if not Append2Simg(data_image_path, verity_image_path,
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"Could not append verity tree!"):
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return False
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return True
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def UnsparseImage(sparse_image_path, replace=True):
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img_dir = os.path.dirname(sparse_image_path)
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unsparse_image_path = "unsparse_" + os.path.basename(sparse_image_path)
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unsparse_image_path = os.path.join(img_dir, unsparse_image_path)
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if os.path.exists(unsparse_image_path):
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if replace:
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os.unlink(unsparse_image_path)
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else:
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return True, unsparse_image_path
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inflate_command = ["simg2img", sparse_image_path, unsparse_image_path]
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exit_code = RunCommand(inflate_command)
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if exit_code != 0:
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os.remove(unsparse_image_path)
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return False, None
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return True, unsparse_image_path
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def MakeVerityEnabledImage(out_file, prop_dict):
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"""Creates an image that is verifiable using dm-verity.
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Args:
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out_file: the location to write the verifiable image at
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prop_dict: a dictionary of properties required for image creation and
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verification
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Returns:
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True on success, False otherwise.
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"""
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# get properties
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image_size = prop_dict["partition_size"]
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block_dev = prop_dict["verity_block_device"]
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signer_key = prop_dict["verity_key"] + ".pk8"
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signer_path = prop_dict["verity_signer_cmd"]
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# make a tempdir
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tempdir_name = tempfile.mkdtemp(suffix="_verity_images")
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# get partial image paths
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verity_image_path = os.path.join(tempdir_name, "verity.img")
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verity_metadata_path = os.path.join(tempdir_name, "verity_metadata.img")
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# build the verity tree and get the root hash and salt
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if not BuildVerityTree(out_file, verity_image_path, prop_dict):
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shutil.rmtree(tempdir_name, ignore_errors=True)
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return False
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# build the metadata blocks
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root_hash = prop_dict["verity_root_hash"]
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salt = prop_dict["verity_salt"]
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if not BuildVerityMetadata(image_size, verity_metadata_path, root_hash, salt,
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block_dev, signer_path, signer_key):
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shutil.rmtree(tempdir_name, ignore_errors=True)
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return False
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# build the full verified image
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if not BuildVerifiedImage(out_file,
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verity_image_path,
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verity_metadata_path):
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shutil.rmtree(tempdir_name, ignore_errors=True)
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return False
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shutil.rmtree(tempdir_name, ignore_errors=True)
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return True
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def BuildImage(in_dir, prop_dict, out_file):
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"""Build an image to out_file from in_dir with property prop_dict.
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Args:
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in_dir: path of input directory.
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prop_dict: property dictionary.
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out_file: path of the output image file.
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Returns:
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True iff the image is built successfully.
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"""
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# system_root_image=true: build a system.img that combines the contents of /system
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# and the ramdisk, and can be mounted at the root of the file system.
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origin_in = in_dir
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fs_config = prop_dict.get("fs_config")
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if (prop_dict.get("system_root_image") == "true"
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and prop_dict["mount_point"] == "system"):
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in_dir = tempfile.mkdtemp()
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# Change the mount point to "/"
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prop_dict["mount_point"] = "/"
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if fs_config:
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# We need to merge the fs_config files of system and ramdisk.
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fd, merged_fs_config = tempfile.mkstemp(prefix="root_fs_config",
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suffix=".txt")
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os.close(fd)
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with open(merged_fs_config, "w") as fw:
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if "ramdisk_fs_config" in prop_dict:
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with open(prop_dict["ramdisk_fs_config"]) as fr:
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fw.writelines(fr.readlines())
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with open(fs_config) as fr:
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fw.writelines(fr.readlines())
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fs_config = merged_fs_config
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build_command = []
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fs_type = prop_dict.get("fs_type", "")
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run_fsck = False
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is_verity_partition = "verity_block_device" in prop_dict
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verity_supported = prop_dict.get("verity") == "true"
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# adjust the partition size to make room for the hashes if this is to be
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# verified
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if verity_supported and is_verity_partition:
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partition_size = int(prop_dict.get("partition_size"))
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adjusted_size = AdjustPartitionSizeForVerity(partition_size)
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if not adjusted_size:
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return False
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prop_dict["partition_size"] = str(adjusted_size)
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prop_dict["original_partition_size"] = str(partition_size)
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if fs_type.startswith("ext"):
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build_command = ["mkuserimg.sh"]
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if "extfs_sparse_flag" in prop_dict:
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build_command.append(prop_dict["extfs_sparse_flag"])
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run_fsck = True
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build_command.extend([in_dir, out_file, fs_type,
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prop_dict["mount_point"]])
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build_command.append(prop_dict["partition_size"])
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if "journal_size" in prop_dict:
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build_command.extend(["-j", prop_dict["journal_size"]])
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if "timestamp" in prop_dict:
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build_command.extend(["-T", str(prop_dict["timestamp"])])
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if fs_config:
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build_command.extend(["-C", fs_config])
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if "block_list" in prop_dict:
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build_command.extend(["-B", prop_dict["block_list"]])
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build_command.extend(["-L", prop_dict["mount_point"]])
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if "selinux_fc" in prop_dict:
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build_command.append(prop_dict["selinux_fc"])
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elif fs_type.startswith("squash"):
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build_command = ["mksquashfsimage.sh"]
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build_command.extend([in_dir, out_file])
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build_command.extend(["-m", prop_dict["mount_point"]])
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if "selinux_fc" in prop_dict:
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build_command.extend(["-c", prop_dict["selinux_fc"]])
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elif fs_type.startswith("f2fs"):
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build_command = ["mkf2fsuserimg.sh"]
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build_command.extend([out_file, prop_dict["partition_size"]])
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else:
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build_command = ["mkyaffs2image", "-f"]
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if prop_dict.get("mkyaffs2_extra_flags", None):
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build_command.extend(prop_dict["mkyaffs2_extra_flags"].split())
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build_command.append(in_dir)
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build_command.append(out_file)
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if "selinux_fc" in prop_dict:
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build_command.append(prop_dict["selinux_fc"])
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build_command.append(prop_dict["mount_point"])
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if in_dir != origin_in:
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# Construct a staging directory of the root file system.
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ramdisk_dir = prop_dict.get("ramdisk_dir")
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if ramdisk_dir:
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shutil.rmtree(in_dir)
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shutil.copytree(ramdisk_dir, in_dir, symlinks=True)
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staging_system = os.path.join(in_dir, "system")
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shutil.rmtree(staging_system, ignore_errors=True)
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shutil.copytree(origin_in, staging_system, symlinks=True)
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try:
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exit_code = RunCommand(build_command)
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finally:
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if in_dir != origin_in:
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# Clean up temporary directories and files.
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shutil.rmtree(in_dir, ignore_errors=True)
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if fs_config:
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os.remove(fs_config)
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if exit_code != 0:
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return False
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# create the verified image if this is to be verified
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if verity_supported and is_verity_partition:
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if not MakeVerityEnabledImage(out_file, prop_dict):
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return False
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if run_fsck and prop_dict.get("skip_fsck") != "true":
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success, unsparse_image = UnsparseImage(out_file, replace=False)
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if not success:
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return False
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# Run e2fsck on the inflated image file
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e2fsck_command = ["e2fsck", "-f", "-n", unsparse_image]
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exit_code = RunCommand(e2fsck_command)
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os.remove(unsparse_image)
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return exit_code == 0
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def ImagePropFromGlobalDict(glob_dict, mount_point):
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"""Build an image property dictionary from the global dictionary.
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Args:
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glob_dict: the global dictionary from the build system.
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mount_point: such as "system", "data" etc.
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"""
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d = {}
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if "build.prop" in glob_dict:
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bp = glob_dict["build.prop"]
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if "ro.build.date.utc" in bp:
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d["timestamp"] = bp["ro.build.date.utc"]
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def copy_prop(src_p, dest_p):
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if src_p in glob_dict:
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d[dest_p] = str(glob_dict[src_p])
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common_props = (
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"extfs_sparse_flag",
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"mkyaffs2_extra_flags",
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"selinux_fc",
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"skip_fsck",
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"verity",
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"verity_key",
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"verity_signer_cmd"
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)
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for p in common_props:
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copy_prop(p, p)
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d["mount_point"] = mount_point
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if mount_point == "system":
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copy_prop("fs_type", "fs_type")
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# Copy the generic sysetem fs type first, override with specific one if
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# available.
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copy_prop("system_fs_type", "fs_type")
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copy_prop("system_size", "partition_size")
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copy_prop("system_journal_size", "journal_size")
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copy_prop("system_verity_block_device", "verity_block_device")
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copy_prop("system_root_image","system_root_image")
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copy_prop("ramdisk_dir","ramdisk_dir")
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elif mount_point == "data":
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# Copy the generic fs type first, override with specific one if available.
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copy_prop("fs_type", "fs_type")
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copy_prop("userdata_fs_type", "fs_type")
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copy_prop("userdata_size", "partition_size")
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elif mount_point == "cache":
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copy_prop("cache_fs_type", "fs_type")
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copy_prop("cache_size", "partition_size")
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elif mount_point == "vendor":
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copy_prop("vendor_fs_type", "fs_type")
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copy_prop("vendor_size", "partition_size")
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copy_prop("vendor_journal_size", "journal_size")
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copy_prop("vendor_verity_block_device", "verity_block_device")
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elif mount_point == "oem":
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copy_prop("fs_type", "fs_type")
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copy_prop("oem_size", "partition_size")
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copy_prop("oem_journal_size", "journal_size")
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return d
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def LoadGlobalDict(filename):
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"""Load "name=value" pairs from filename"""
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d = {}
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f = open(filename)
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for line in f:
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line = line.strip()
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if not line or line.startswith("#"):
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continue
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k, v = line.split("=", 1)
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d[k] = v
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f.close()
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return d
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def main(argv):
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if len(argv) != 3:
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print __doc__
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sys.exit(1)
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in_dir = argv[0]
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glob_dict_file = argv[1]
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out_file = argv[2]
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glob_dict = LoadGlobalDict(glob_dict_file)
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if "mount_point" in glob_dict:
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# The caller knows the mount point and provides a dictionay needed by BuildImage().
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image_properties = glob_dict
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else:
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image_filename = os.path.basename(out_file)
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mount_point = ""
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if image_filename == "system.img":
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mount_point = "system"
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elif image_filename == "userdata.img":
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mount_point = "data"
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elif image_filename == "cache.img":
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mount_point = "cache"
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elif image_filename == "vendor.img":
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mount_point = "vendor"
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elif image_filename == "oem.img":
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mount_point = "oem"
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else:
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print >> sys.stderr, "error: unknown image file name ", image_filename
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exit(1)
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image_properties = ImagePropFromGlobalDict(glob_dict, mount_point)
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if not BuildImage(in_dir, image_properties, out_file):
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print >> sys.stderr, "error: failed to build %s from %s" % (out_file,
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in_dir)
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exit(1)
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if __name__ == '__main__':
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main(sys.argv[1:])
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