# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import os
import re
import common
class EdifyGenerator(object):
"""Class to generate scripts in the 'edify' recovery script language
used from donut onwards."""
def __init__(self, version, info):
self.script = []
self.mounts = set()
self.version = version
self.info = info
def MakeTemporary(self):
"""Make a temporary script object whose commands can latter be
appended to the parent script with AppendScript(). Used when the
caller wants to generate script commands out-of-order."""
x = EdifyGenerator(self.version, self.info)
x.mounts = self.mounts
return x
@staticmethod
def _WordWrap(cmd, linelen=80):
"""'cmd' should be a function call with null characters after each
parameter (eg, "somefun(foo,\0bar,\0baz)"). This function wraps cmd
to a given line length, replacing nulls with spaces and/or newlines
to format it nicely."""
indent = cmd.index("(")+1
out = []
first = True
x = re.compile("^(.{,%d})\0" % (linelen-indent,))
while True:
if not first:
out.append(" " * indent)
first = False
m = x.search(cmd)
if not m:
parts = cmd.split("\0", 1)
out.append(parts[0]+"\n")
if len(parts) == 1:
break
else:
cmd = parts[1]
continue
out.append(m.group(1)+"\n")
cmd = cmd[m.end():]
return "".join(out).replace("\0", " ").rstrip("\n")
def AppendScript(self, other):
"""Append the contents of another script (which should be created
with temporary=True) to this one."""
self.script.extend(other.script)
def AssertOemProperty(self, name, value):
"""Assert that a property on the OEM paritition matches a value."""
if not name:
raise ValueError("must specify an OEM property")
if not value:
raise ValueError("must specify the OEM value")
cmd = ('file_getprop("/oem/oem.prop", "%s") == "%s" || '
'abort("This package expects the value \\"%s\\" for '
'\\"%s\\" on the OEM partition; '
'this has value \\"" + file_getprop("/oem/oem.prop") + "\\".");'
) % (name, value, name, value)
self.script.append(cmd)
def AssertSomeFingerprint(self, *fp):
"""Assert that the current recovery build fingerprint is one of *fp."""
if not fp:
raise ValueError("must specify some fingerprints")
cmd = (
' ||\n '.join([('getprop("ro.build.fingerprint") == "%s"')
% i for i in fp]) +
' ||\n abort("Package expects build fingerprint of %s; this '
'device has " + getprop("ro.build.fingerprint") + ".");'
) % (" or ".join(fp),)
self.script.append(cmd)
def AssertSomeThumbprint(self, *fp):
"""Assert that the current recovery build thumbprint is one of *fp."""
if not fp:
raise ValueError("must specify some thumbprints")
cmd = (
' ||\n '.join([('getprop("ro.build.thumbprint") == "%s"')
% i for i in fp]) +
' ||\n abort("Package expects build thumbprint of %s; this '
'device has " + getprop("ro.build.thumbprint") + ".");'
) % (" or ".join(fp),)
self.script.append(cmd)
def AssertOlderBuild(self, timestamp, timestamp_text):
"""Assert that the build on the device is older (or the same as)
the given timestamp."""
self.script.append(
('(!less_than_int(%s, getprop("ro.build.date.utc"))) || '
'abort("Can\'t install this package (%s) over newer '
'build (" + getprop("ro.build.date") + ").");'
) % (timestamp, timestamp_text))
def AssertDevice(self, device):
"""Assert that the device identifier is the given string."""
cmd = ('getprop("ro.product.device") == "%s" || '
'abort("This package is for \\"%s\\" devices; '
'this is a \\"" + getprop("ro.product.device") + "\\".");'
) % (device, device)
self.script.append(cmd)
def AssertSomeBootloader(self, *bootloaders):
"""Asert that the bootloader version is one of *bootloaders."""
cmd = ("assert(" +
" ||\0".join(['getprop("ro.bootloader") == "%s"' % (b,)
for b in bootloaders]) +
");")
self.script.append(self._WordWrap(cmd))
def ShowProgress(self, frac, dur):
"""Update the progress bar, advancing it over 'frac' over the next
'dur' seconds. 'dur' may be zero to advance it via SetProgress
commands instead of by time."""
self.script.append("show_progress(%f, %d);" % (frac, int(dur)))
def SetProgress(self, frac):
"""Set the position of the progress bar within the chunk defined
by the most recent ShowProgress call. 'frac' should be in
[0,1]."""
self.script.append("set_progress(%f);" % (frac,))
def PatchCheck(self, filename, *sha1):
"""Check that the given file (or MTD reference) has one of the
given *sha1 hashes, checking the version saved in cache if the
file does not match."""
self.script.append(
'apply_patch_check("%s"' % (filename,) +
"".join([', "%s"' % (i,) for i in sha1]) +
') || abort("\\"%s\\" has unexpected contents.");' % (filename,))
def FileCheck(self, filename, *sha1):
"""Check that the given file (or MTD reference) has one of the
given *sha1 hashes."""
self.script.append('assert(sha1_check(read_file("%s")' % (filename,) +
"".join([', "%s"' % (i,) for i in sha1]) +
'));')
def CacheFreeSpaceCheck(self, amount):
"""Check that there's at least 'amount' space that can be made
available on /cache."""
self.script.append(('apply_patch_space(%d) || abort("Not enough free space '
'on /system to apply patches.");') % (amount,))
def Mount(self, mount_point, mount_options_by_format=""):
"""Mount the partition with the given mount_point.
mount_options_by_format:
[fs_type=option[,option]...[|fs_type=option[,option]...]...]
where option is optname[=optvalue]
E.g. ext4=barrier=1,nodelalloc,errors=panic|f2fs=errors=recover
"""
fstab = self.info.get("fstab", None)
if fstab:
p = fstab[mount_point]
mount_dict = {}
if mount_options_by_format is not None:
for option in mount_options_by_format.split("|"):
if "=" in option:
key, value = option.split("=", 1)
mount_dict[key] = value
self.script.append('mount("%s", "%s", "%s", "%s", "%s");' %
(p.fs_type, common.PARTITION_TYPES[p.fs_type],
p.device, p.mount_point, mount_dict.get(p.fs_type, "")))
self.mounts.add(p.mount_point)
def UnpackPackageDir(self, src, dst):
"""Unpack a given directory from the OTA package into the given
destination directory."""
self.script.append('package_extract_dir("%s", "%s");' % (src, dst))
def Comment(self, comment):
"""Write a comment into the update script."""
self.script.append("")
for i in comment.split("\n"):
self.script.append("# " + i)
self.script.append("")
def Print(self, message):
"""Log a message to the screen (if the logs are visible)."""
self.script.append('ui_print("%s");' % (message,))
def FormatPartition(self, partition):
"""Format the given partition, specified by its mount point (eg,
"/system")."""
reserve_size = 0
fstab = self.info.get("fstab", None)
if fstab:
p = fstab[partition]
self.script.append('format("%s", "%s", "%s", "%s", "%s");' %
(p.fs_type, common.PARTITION_TYPES[p.fs_type],
p.device, p.length, p.mount_point))
def WipeBlockDevice(self, partition):
if partition not in ("/system", "/vendor"):
raise ValueError(("WipeBlockDevice doesn't work on %s\n") % (partition,))
fstab = self.info.get("fstab", None)
size = self.info.get(partition.lstrip("/") + "_size", None)
device = fstab[partition].device
self.script.append('wipe_block_device("%s", %s);' % (device, size))
def DeleteFiles(self, file_list):
"""Delete all files in file_list."""
if not file_list: return
cmd = "delete(" + ",\0".join(['"%s"' % (i,) for i in file_list]) + ");"
self.script.append(self._WordWrap(cmd))
def RenameFile(self, srcfile, tgtfile):
"""Moves a file from one location to another."""
if self.info.get("update_rename_support", False):
self.script.append('rename("%s", "%s");' % (srcfile, tgtfile))
else:
raise ValueError("Rename not supported by update binary")
def SkipNextActionIfTargetExists(self, tgtfile, tgtsha1):
"""Prepend an action with an apply_patch_check in order to
skip the action if the file exists. Used when a patch
is later renamed."""
cmd = ('sha1_check(read_file("%s"), %s) || ' % (tgtfile, tgtsha1))
self.script.append(self._WordWrap(cmd))
def ApplyPatch(self, srcfile, tgtfile, tgtsize, tgtsha1, *patchpairs):
"""Apply binary patches (in *patchpairs) to the given srcfile to
produce tgtfile (which may be "-" to indicate overwriting the
source file."""
if len(patchpairs) % 2 != 0 or len(patchpairs) == 0:
raise ValueError("bad patches given to ApplyPatch")
cmd = ['apply_patch("%s",\0"%s",\0%s,\0%d'
% (srcfile, tgtfile, tgtsha1, tgtsize)]
for i in range(0, len(patchpairs), 2):
cmd.append(',\0%s, package_extract_file("%s")' % patchpairs[i:i+2])
cmd.append(');')
cmd = "".join(cmd)
self.script.append(self._WordWrap(cmd))
def WriteRawImage(self, mount_point, fn, mapfn=None):
"""Write the given package file into the partition for the given
mount point."""
fstab = self.info["fstab"]
if fstab:
p = fstab[mount_point]
partition_type = common.PARTITION_TYPES[p.fs_type]
args = {'device': p.device, 'fn': fn}
if partition_type == "MTD":
self.script.append(
'write_raw_image(package_extract_file("%(fn)s"), "%(device)s");'
% args)
elif partition_type == "EMMC":
if mapfn:
args["map"] = mapfn
self.script.append(
'package_extract_file("%(fn)s", "%(device)s", "%(map)s");' % args)
else:
self.script.append(
'package_extract_file("%(fn)s", "%(device)s");' % args)
else:
raise ValueError("don't know how to write \"%s\" partitions" % (p.fs_type,))
def SetPermissions(self, fn, uid, gid, mode, selabel, capabilities):
"""Set file ownership and permissions."""
if not self.info.get("use_set_metadata", False):
self.script.append('set_perm(%d, %d, 0%o, "%s");' % (uid, gid, mode, fn))
else:
if capabilities is None: capabilities = "0x0"
cmd = 'set_metadata("%s", "uid", %d, "gid", %d, "mode", 0%o, ' \
'"capabilities", %s' % (fn, uid, gid, mode, capabilities)
if selabel is not None:
cmd += ', "selabel", "%s"' % ( selabel )
cmd += ');'
self.script.append(cmd)
def SetPermissionsRecursive(self, fn, uid, gid, dmode, fmode, selabel, capabilities):
"""Recursively set path ownership and permissions."""
if not self.info.get("use_set_metadata", False):
self.script.append('set_perm_recursive(%d, %d, 0%o, 0%o, "%s");'
% (uid, gid, dmode, fmode, fn))
else:
if capabilities is None: capabilities = "0x0"
cmd = 'set_metadata_recursive("%s", "uid", %d, "gid", %d, ' \
'"dmode", 0%o, "fmode", 0%o, "capabilities", %s' \
% (fn, uid, gid, dmode, fmode, capabilities)
if selabel is not None:
cmd += ', "selabel", "%s"' % ( selabel )
cmd += ');'
self.script.append(cmd)
def MakeSymlinks(self, symlink_list):
"""Create symlinks, given a list of (dest, link) pairs."""
by_dest = {}
for d, l in symlink_list:
by_dest.setdefault(d, []).append(l)
for dest, links in sorted(by_dest.iteritems()):
cmd = ('symlink("%s", ' % (dest,) +
",\0".join(['"' + i + '"' for i in sorted(links)]) + ");")
self.script.append(self._WordWrap(cmd))
def AppendExtra(self, extra):
"""Append text verbatim to the output script."""
self.script.append(extra)
def Unmount(self, mount_point):
self.script.append('unmount("%s");' % (mount_point,))
self.mounts.remove(mount_point);
def UnmountAll(self):
for p in sorted(self.mounts):
self.script.append('unmount("%s");' % (p,))
self.mounts = set()
def AddToZip(self, input_zip, output_zip, input_path=None):
"""Write the accumulated script to the output_zip file. input_zip
is used as the source for the 'updater' binary needed to run
script. If input_path is not None, it will be used as a local
path for the binary instead of input_zip."""
self.UnmountAll()
common.ZipWriteStr(output_zip, "META-INF/com/google/android/updater-script",
"\n".join(self.script) + "\n")
if input_path is None:
data = input_zip.read("OTA/bin/updater")
else:
data = open(input_path, "rb").read()
common.ZipWriteStr(output_zip, "META-INF/com/google/android/update-binary",
data, perms=0755)