408 lines
16 KiB
Python
408 lines
16 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 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, fstab=None):
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self.script = []
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self.mounts = set()
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self._required_cache = 0
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self.version = version
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self.info = info
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if fstab is None:
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self.fstab = self.info.get("fstab", None)
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else:
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self.fstab = fstab
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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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@property
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def required_cache(self):
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"""Return the minimum cache size to apply the update."""
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return self._required_cache
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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 AssertOemProperty(self, name, value):
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"""Assert that a property on the OEM paritition matches a value."""
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if not name:
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raise ValueError("must specify an OEM property")
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if not value:
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raise ValueError("must specify the OEM value")
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if common.OPTIONS.oem_no_mount:
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cmd = ('getprop("{name}") == "{value}" || '
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'abort("This package expects the value \\"{value}\\" for '
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'\\"{name}\\"; this has value \\"" + '
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'getprop("{name}") + "\\".");').format(name=name, value=value)
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else:
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cmd = ('file_getprop("/oem/oem.prop", "{name}") == "{value}" || '
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'abort("This package expects the value \\"{value}\\" for '
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'\\"{name}\\" on the OEM partition; this has value \\"" + '
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'file_getprop("/oem/oem.prop", "{name}") + "\\".");').format(
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name=name, value=value)
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self.script.append(cmd)
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def AssertSomeFingerprint(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 = (' ||\n '.join([('getprop("ro.build.fingerprint") == "%s"') % i
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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 AssertSomeThumbprint(self, *fp):
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"""Assert that the current recovery build thumbprint is one of *fp."""
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if not fp:
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raise ValueError("must specify some thumbprints")
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cmd = (' ||\n '.join([('getprop("ro.build.thumbprint") == "%s"') % i
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for i in fp]) +
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' ||\n abort("Package expects build thumbprint of %s; this '
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'device has " + getprop("ro.build.thumbprint") + ".");') % (
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" or ".join(fp))
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self.script.append(cmd)
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def AssertFingerprintOrThumbprint(self, fp, tp):
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"""Assert that the current recovery build fingerprint is fp, or thumbprint
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is tp."""
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cmd = ('getprop("ro.build.fingerprint") == "{fp}" ||\n'
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' getprop("ro.build.thumbprint") == "{tp}" ||\n'
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' abort("Package expects build fingerprint of {fp} or '
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'thumbprint of {tp}; this device has a fingerprint of " '
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'+ getprop("ro.build.fingerprint") and a thumbprint of " '
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'+ getprop("ro.build.thumbprint") + ".");').format(fp=fp, tp=tp)
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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") + ").");') % (timestamp,
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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 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 Verify(self, filename):
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"""Check that the given file has one of the
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given hashes (encoded in the filename)."""
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self.script.append(
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'apply_patch_check("{filename}") && '
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'ui_print(" Verified.") || '
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'ui_print("\\"{filename}\\" has unexpected contents.");'.format(
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filename=filename))
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def FileCheck(self, filename, *sha1):
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"""Check that the given file 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._required_cache = max(self._required_cache, amount)
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self.script.append(('apply_patch_space(%d) || abort("Not enough free space '
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'on /cache to apply patches.");') % (amount,))
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def Mount(self, mount_point, mount_options_by_format=""):
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"""Mount the partition with the given mount_point.
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mount_options_by_format:
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[fs_type=option[,option]...[|fs_type=option[,option]...]...]
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where option is optname[=optvalue]
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E.g. ext4=barrier=1,nodelalloc,errors=panic|f2fs=errors=recover
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"""
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fstab = self.fstab
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if fstab:
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p = fstab[mount_point]
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mount_dict = {}
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if mount_options_by_format is not None:
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for option in mount_options_by_format.split("|"):
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if "=" in option:
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key, value = option.split("=", 1)
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mount_dict[key] = value
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mount_flags = mount_dict.get(p.fs_type, "")
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if p.context is not None:
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mount_flags = p.context + ("," + mount_flags if mount_flags else "")
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self.script.append('mount("%s", "%s", "%s", "%s", "%s");' % (
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p.fs_type, common.PARTITION_TYPES[p.fs_type], p.device,
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p.mount_point, mount_flags))
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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 TunePartition(self, partition, *options):
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fstab = self.fstab
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if fstab:
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p = fstab[partition]
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if p.fs_type not in ("ext2", "ext3", "ext4"):
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raise ValueError("Partition %s cannot be tuned\n" % (partition,))
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self.script.append(
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'tune2fs(' + "".join(['"%s", ' % (i,) for i in options]) +
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'"%s") || abort("Failed to tune partition %s");' % (
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p.device, partition))
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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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fstab = self.fstab
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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 not in ("/system", "/vendor"):
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raise ValueError(("WipeBlockDevice doesn't work on %s\n") % (partition,))
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fstab = self.fstab
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size = self.info.get(partition.lstrip("/") + "_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:
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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 DeleteFilesIfNotMatching(self, file_list):
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"""Delete the file in file_list if not matching the checksum."""
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if not file_list:
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return
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for name, sha1 in file_list:
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cmd = ('sha1_check(read_file("{name}"), "{sha1}") || '
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'delete("{name}");'.format(name=name, sha1=sha1))
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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,\0package_extract_file("%s")' % patchpairs[i:i+2])
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cmd.append(') ||\n abort("Failed to apply patch to %s");' % (srcfile,))
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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.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 == "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(
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"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:
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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,
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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:
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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 Unmount(self, mount_point):
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self.script.append('unmount("%s");' % mount_point)
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self.mounts.remove(mount_point)
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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=0o755)
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