5fad2039bb
The system partitions has regions that we shouldn't write and can't depend on the contents of. Adds a new script to generate a map of these regions (using the sparse image as input), and include the map in the package zip so it can be used when writing or patching the system partition. Also fixes a bug where the wrong SELinux file contexts are used when generating incrementals. Change-Id: Iaca5b967a3b7d1df843c7c21becc19b3f1633dad
333 lines
13 KiB
Python
333 lines
13 KiB
Python
# Copyright (C) 2009 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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import os
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import re
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import common
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class EdifyGenerator(object):
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"""Class to generate scripts in the 'edify' recovery script language
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used from donut onwards."""
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def __init__(self, version, info):
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self.script = []
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self.mounts = set()
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self.version = version
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self.info = info
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def MakeTemporary(self):
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"""Make a temporary script object whose commands can latter be
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appended to the parent script with AppendScript(). Used when the
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caller wants to generate script commands out-of-order."""
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x = EdifyGenerator(self.version, self.info)
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x.mounts = self.mounts
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return x
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@staticmethod
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def _WordWrap(cmd, linelen=80):
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"""'cmd' should be a function call with null characters after each
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parameter (eg, "somefun(foo,\0bar,\0baz)"). This function wraps cmd
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to a given line length, replacing nulls with spaces and/or newlines
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to format it nicely."""
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indent = cmd.index("(")+1
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out = []
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first = True
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x = re.compile("^(.{,%d})\0" % (linelen-indent,))
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while True:
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if not first:
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out.append(" " * indent)
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first = False
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m = x.search(cmd)
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if not m:
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parts = cmd.split("\0", 1)
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out.append(parts[0]+"\n")
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if len(parts) == 1:
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break
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else:
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cmd = parts[1]
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continue
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out.append(m.group(1)+"\n")
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cmd = cmd[m.end():]
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return "".join(out).replace("\0", " ").rstrip("\n")
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def AppendScript(self, other):
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"""Append the contents of another script (which should be created
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with temporary=True) to this one."""
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self.script.extend(other.script)
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def AssertSomeFingerprint(self, *fp):
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"""Assert that the current system build fingerprint is one of *fp."""
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if not fp:
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raise ValueError("must specify some fingerprints")
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cmd = (
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' ||\n '.join([('file_getprop("/system/build.prop", '
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'"ro.build.fingerprint") == "%s"')
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% i for i in fp]) +
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' ||\n abort("Package expects build fingerprint of %s; this '
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'device has " + getprop("ro.build.fingerprint") + ".");'
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) % (" or ".join(fp),)
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self.script.append(cmd)
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def AssertRecoveryFingerprint(self, *fp):
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"""Assert that the current recovery build fingerprint is one of *fp."""
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if not fp:
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raise ValueError("must specify some fingerprints")
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cmd = (
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' ||\n '.join([('getprop("ro.build.fingerprint") == "%s"')
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% i for i in fp]) +
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' ||\n abort("Package expects build fingerprint of %s; this '
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'device has " + getprop("ro.build.fingerprint") + ".");'
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) % (" or ".join(fp),)
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self.script.append(cmd)
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def AssertOlderBuild(self, timestamp, timestamp_text):
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"""Assert that the build on the device is older (or the same as)
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the given timestamp."""
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self.script.append(
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('(!less_than_int(%s, getprop("ro.build.date.utc"))) || '
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'abort("Can\'t install this package (%s) over newer '
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'build (" + getprop("ro.build.date") + ").");'
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) % (timestamp, timestamp_text))
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def AssertDevice(self, device):
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"""Assert that the device identifier is the given string."""
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cmd = ('getprop("ro.product.device") == "%s" || '
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'abort("This package is for \\"%s\\" devices; '
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'this is a \\"" + getprop("ro.product.device") + "\\".");'
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) % (device, device)
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self.script.append(cmd)
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def AssertSomeBootloader(self, *bootloaders):
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"""Asert that the bootloader version is one of *bootloaders."""
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cmd = ("assert(" +
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" ||\0".join(['getprop("ro.bootloader") == "%s"' % (b,)
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for b in bootloaders]) +
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");")
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self.script.append(self._WordWrap(cmd))
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def ShowProgress(self, frac, dur):
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"""Update the progress bar, advancing it over 'frac' over the next
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'dur' seconds. 'dur' may be zero to advance it via SetProgress
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commands instead of by time."""
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self.script.append("show_progress(%f, %d);" % (frac, int(dur)))
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def SetProgress(self, frac):
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"""Set the position of the progress bar within the chunk defined
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by the most recent ShowProgress call. 'frac' should be in
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[0,1]."""
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self.script.append("set_progress(%f);" % (frac,))
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def PatchCheck(self, filename, *sha1):
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"""Check that the given file (or MTD reference) has one of the
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given *sha1 hashes, checking the version saved in cache if the
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file does not match."""
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self.script.append(
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'apply_patch_check("%s"' % (filename,) +
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"".join([', "%s"' % (i,) for i in sha1]) +
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') || abort("\\"%s\\" has unexpected contents.");' % (filename,))
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def FileCheck(self, filename, *sha1):
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"""Check that the given file (or MTD reference) has one of the
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given *sha1 hashes."""
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self.script.append('assert(sha1_check(read_file("%s")' % (filename,) +
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"".join([', "%s"' % (i,) for i in sha1]) +
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'));')
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def CacheFreeSpaceCheck(self, amount):
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"""Check that there's at least 'amount' space that can be made
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available on /cache."""
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self.script.append(('apply_patch_space(%d) || abort("Not enough free space '
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'on /system to apply patches.");') % (amount,))
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def Mount(self, mount_point):
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"""Mount the partition with the given mount_point."""
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fstab = self.info.get("fstab", None)
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if fstab:
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p = fstab[mount_point]
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self.script.append('mount("%s", "%s", "%s", "%s");' %
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(p.fs_type, common.PARTITION_TYPES[p.fs_type],
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p.device, p.mount_point))
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self.mounts.add(p.mount_point)
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def UnpackPackageDir(self, src, dst):
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"""Unpack a given directory from the OTA package into the given
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destination directory."""
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self.script.append('package_extract_dir("%s", "%s");' % (src, dst))
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def Comment(self, comment):
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"""Write a comment into the update script."""
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self.script.append("")
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for i in comment.split("\n"):
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self.script.append("# " + i)
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self.script.append("")
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def Print(self, message):
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"""Log a message to the screen (if the logs are visible)."""
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self.script.append('ui_print("%s");' % (message,))
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def FormatPartition(self, partition):
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"""Format the given partition, specified by its mount point (eg,
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"/system")."""
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reserve_size = 0
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fstab = self.info.get("fstab", None)
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if fstab:
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p = fstab[partition]
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self.script.append('format("%s", "%s", "%s", "%s", "%s");' %
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(p.fs_type, common.PARTITION_TYPES[p.fs_type],
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p.device, p.length, p.mount_point))
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def WipeBlockDevice(self, partition):
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if partition != "/system":
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raise ValueError(("WipeBlockDevice currently only works "
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"on /system, not %s\n") % (partition,))
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fstab = self.info.get("fstab", None)
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size = self.info.get("system_size", None)
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device = fstab[partition].device
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self.script.append('wipe_block_device("%s", %s);' % (device, size))
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def DeleteFiles(self, file_list):
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"""Delete all files in file_list."""
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if not file_list: return
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cmd = "delete(" + ",\0".join(['"%s"' % (i,) for i in file_list]) + ");"
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self.script.append(self._WordWrap(cmd))
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def RenameFile(self, srcfile, tgtfile):
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"""Moves a file from one location to another."""
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if self.info.get("update_rename_support", False):
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self.script.append('rename("%s", "%s");' % (srcfile, tgtfile))
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else:
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raise ValueError("Rename not supported by update binary")
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def SkipNextActionIfTargetExists(self, tgtfile, tgtsha1):
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"""Prepend an action with an apply_patch_check in order to
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skip the action if the file exists. Used when a patch
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is later renamed."""
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cmd = ('sha1_check(read_file("%s"), %s) || ' % (tgtfile, tgtsha1))
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self.script.append(self._WordWrap(cmd))
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def ApplyPatch(self, srcfile, tgtfile, tgtsize, tgtsha1, *patchpairs):
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"""Apply binary patches (in *patchpairs) to the given srcfile to
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produce tgtfile (which may be "-" to indicate overwriting the
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source file."""
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if len(patchpairs) % 2 != 0 or len(patchpairs) == 0:
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raise ValueError("bad patches given to ApplyPatch")
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cmd = ['apply_patch("%s",\0"%s",\0%s,\0%d'
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% (srcfile, tgtfile, tgtsha1, tgtsize)]
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for i in range(0, len(patchpairs), 2):
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cmd.append(',\0%s, package_extract_file("%s")' % patchpairs[i:i+2])
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cmd.append(');')
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cmd = "".join(cmd)
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self.script.append(self._WordWrap(cmd))
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def WriteRawImage(self, mount_point, fn, mapfn=None):
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"""Write the given package file into the partition for the given
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mount point."""
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fstab = self.info["fstab"]
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if fstab:
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p = fstab[mount_point]
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partition_type = common.PARTITION_TYPES[p.fs_type]
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args = {'device': p.device, 'fn': fn}
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if partition_type == "MTD":
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self.script.append(
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'write_raw_image(package_extract_file("%(fn)s"), "%(device)s");'
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% args)
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elif partition_type == "EMMC":
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if mapfn:
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args["map"] = mapfn
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self.script.append(
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'package_extract_file("%(fn)s", "%(device)s", "%(map)s");' % args)
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else:
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self.script.append(
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'package_extract_file("%(fn)s", "%(device)s");' % args)
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else:
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raise ValueError("don't know how to write \"%s\" partitions" % (p.fs_type,))
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def SetPermissions(self, fn, uid, gid, mode, selabel, capabilities):
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"""Set file ownership and permissions."""
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if not self.info.get("use_set_metadata", False):
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self.script.append('set_perm(%d, %d, 0%o, "%s");' % (uid, gid, mode, fn))
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else:
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if capabilities is None: capabilities = "0x0"
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cmd = 'set_metadata("%s", "uid", %d, "gid", %d, "mode", 0%o, ' \
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'"capabilities", %s' % (fn, uid, gid, mode, capabilities)
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if selabel is not None:
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cmd += ', "selabel", "%s"' % ( selabel )
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cmd += ');'
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self.script.append(cmd)
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def SetPermissionsRecursive(self, fn, uid, gid, dmode, fmode, selabel, capabilities):
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"""Recursively set path ownership and permissions."""
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if not self.info.get("use_set_metadata", False):
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self.script.append('set_perm_recursive(%d, %d, 0%o, 0%o, "%s");'
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% (uid, gid, dmode, fmode, fn))
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else:
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if capabilities is None: capabilities = "0x0"
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cmd = 'set_metadata_recursive("%s", "uid", %d, "gid", %d, ' \
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'"dmode", 0%o, "fmode", 0%o, "capabilities", %s' \
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% (fn, uid, gid, dmode, fmode, capabilities)
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if selabel is not None:
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cmd += ', "selabel", "%s"' % ( selabel )
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cmd += ');'
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self.script.append(cmd)
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def MakeSymlinks(self, symlink_list):
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"""Create symlinks, given a list of (dest, link) pairs."""
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by_dest = {}
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for d, l in symlink_list:
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by_dest.setdefault(d, []).append(l)
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for dest, links in sorted(by_dest.iteritems()):
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cmd = ('symlink("%s", ' % (dest,) +
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",\0".join(['"' + i + '"' for i in sorted(links)]) + ");")
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self.script.append(self._WordWrap(cmd))
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def AppendExtra(self, extra):
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"""Append text verbatim to the output script."""
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self.script.append(extra)
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def UnmountAll(self):
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for p in sorted(self.mounts):
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self.script.append('unmount("%s");' % (p,))
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self.mounts = set()
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def AddToZip(self, input_zip, output_zip, input_path=None):
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"""Write the accumulated script to the output_zip file. input_zip
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is used as the source for the 'updater' binary needed to run
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script. If input_path is not None, it will be used as a local
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path for the binary instead of input_zip."""
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self.UnmountAll()
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common.ZipWriteStr(output_zip, "META-INF/com/google/android/updater-script",
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"\n".join(self.script) + "\n")
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if input_path is None:
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data = input_zip.read("OTA/bin/updater")
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else:
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data = open(input_path, "rb").read()
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common.ZipWriteStr(output_zip, "META-INF/com/google/android/update-binary",
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data, perms=0755)
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def Syspatch(self, filename, target_mapfile, target_sha,
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source_mapfile, source_sha, patchfile):
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"""Applies a compressed binary patch to a block device."""
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call = 'syspatch("%s", "%s", "%s", "%s", "%s", "%s");'
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self.script.append(call % (filename, target_mapfile, target_sha,
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source_mapfile, source_sha, patchfile))
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