u-boot/tools/patman/tools.py
Simon Glass 3b3e3c0f6c patman: Adjust 'command' to return strings instead of bytes
At present all the 'command' methods return bytes. Most of the time we
actually want strings, so change this. We still need to keep the internal
representation as bytes since otherwise unicode strings might break over
a read() boundary (e.g. 4KB), causing errors. But we can convert the end
result to strings.

Add a 'binary' parameter to cover the few cases where bytes are needed.

Signed-off-by: Simon Glass <sjg@chromium.org>
2019-11-04 18:15:32 -07:00

518 lines
14 KiB
Python

# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (c) 2016 Google, Inc
#
from __future__ import print_function
import command
import glob
import os
import shutil
import struct
import sys
import tempfile
import tout
# Output directly (generally this is temporary)
outdir = None
# True to keep the output directory around after exiting
preserve_outdir = False
# Path to the Chrome OS chroot, if we know it
chroot_path = None
# Search paths to use for Filename(), used to find files
search_paths = []
tool_search_paths = []
# Tools and the packages that contain them, on debian
packages = {
'lz4': 'liblz4-tool',
}
# List of paths to use when looking for an input file
indir = []
def PrepareOutputDir(dirname, preserve=False):
"""Select an output directory, ensuring it exists.
This either creates a temporary directory or checks that the one supplied
by the user is valid. For a temporary directory, it makes a note to
remove it later if required.
Args:
dirname: a string, name of the output directory to use to store
intermediate and output files. If is None - create a temporary
directory.
preserve: a Boolean. If outdir above is None and preserve is False, the
created temporary directory will be destroyed on exit.
Raises:
OSError: If it cannot create the output directory.
"""
global outdir, preserve_outdir
preserve_outdir = dirname or preserve
if dirname:
outdir = dirname
if not os.path.isdir(outdir):
try:
os.makedirs(outdir)
except OSError as err:
raise CmdError("Cannot make output directory '%s': '%s'" %
(outdir, err.strerror))
tout.Debug("Using output directory '%s'" % outdir)
else:
outdir = tempfile.mkdtemp(prefix='binman.')
tout.Debug("Using temporary directory '%s'" % outdir)
def _RemoveOutputDir():
global outdir
shutil.rmtree(outdir)
tout.Debug("Deleted temporary directory '%s'" % outdir)
outdir = None
def FinaliseOutputDir():
global outdir, preserve_outdir
"""Tidy up: delete output directory if temporary and not preserved."""
if outdir and not preserve_outdir:
_RemoveOutputDir()
outdir = None
def GetOutputFilename(fname):
"""Return a filename within the output directory.
Args:
fname: Filename to use for new file
Returns:
The full path of the filename, within the output directory
"""
return os.path.join(outdir, fname)
def _FinaliseForTest():
"""Remove the output directory (for use by tests)"""
global outdir
if outdir:
_RemoveOutputDir()
outdir = None
def SetInputDirs(dirname):
"""Add a list of input directories, where input files are kept.
Args:
dirname: a list of paths to input directories to use for obtaining
files needed by binman to place in the image.
"""
global indir
indir = dirname
tout.Debug("Using input directories %s" % indir)
def GetInputFilename(fname):
"""Return a filename for use as input.
Args:
fname: Filename to use for new file
Returns:
The full path of the filename, within the input directory
"""
if not indir or fname[:1] == '/':
return fname
for dirname in indir:
pathname = os.path.join(dirname, fname)
if os.path.exists(pathname):
return pathname
raise ValueError("Filename '%s' not found in input path (%s) (cwd='%s')" %
(fname, ','.join(indir), os.getcwd()))
def GetInputFilenameGlob(pattern):
"""Return a list of filenames for use as input.
Args:
pattern: Filename pattern to search for
Returns:
A list of matching files in all input directories
"""
if not indir:
return glob.glob(fname)
files = []
for dirname in indir:
pathname = os.path.join(dirname, pattern)
files += glob.glob(pathname)
return sorted(files)
def Align(pos, align):
if align:
mask = align - 1
pos = (pos + mask) & ~mask
return pos
def NotPowerOfTwo(num):
return num and (num & (num - 1))
def SetToolPaths(toolpaths):
"""Set the path to search for tools
Args:
toolpaths: List of paths to search for tools executed by Run()
"""
global tool_search_paths
tool_search_paths = toolpaths
def PathHasFile(path_spec, fname):
"""Check if a given filename is in the PATH
Args:
path_spec: Value of PATH variable to check
fname: Filename to check
Returns:
True if found, False if not
"""
for dir in path_spec.split(':'):
if os.path.exists(os.path.join(dir, fname)):
return True
return False
def Run(name, *args, **kwargs):
"""Run a tool with some arguments
This runs a 'tool', which is a program used by binman to process files and
perhaps produce some output. Tools can be located on the PATH or in a
search path.
Args:
name: Command name to run
args: Arguments to the tool
Returns:
CommandResult object
"""
try:
binary = kwargs.get('binary')
env = None
if tool_search_paths:
env = dict(os.environ)
env['PATH'] = ':'.join(tool_search_paths) + ':' + env['PATH']
all_args = (name,) + args
result = command.RunPipe([all_args], capture=True, capture_stderr=True,
env=env, raise_on_error=False, binary=binary)
if result.return_code:
raise Exception("Error %d running '%s': %s" %
(result.return_code,' '.join(all_args),
result.stderr))
return result.stdout
except:
if env and not PathHasFile(env['PATH'], name):
msg = "Please install tool '%s'" % name
package = packages.get(name)
if package:
msg += " (e.g. from package '%s')" % package
raise ValueError(msg)
raise
def Filename(fname):
"""Resolve a file path to an absolute path.
If fname starts with ##/ and chroot is available, ##/ gets replaced with
the chroot path. If chroot is not available, this file name can not be
resolved, `None' is returned.
If fname is not prepended with the above prefix, and is not an existing
file, the actual file name is retrieved from the passed in string and the
search_paths directories (if any) are searched to for the file. If found -
the path to the found file is returned, `None' is returned otherwise.
Args:
fname: a string, the path to resolve.
Returns:
Absolute path to the file or None if not found.
"""
if fname.startswith('##/'):
if chroot_path:
fname = os.path.join(chroot_path, fname[3:])
else:
return None
# Search for a pathname that exists, and return it if found
if fname and not os.path.exists(fname):
for path in search_paths:
pathname = os.path.join(path, os.path.basename(fname))
if os.path.exists(pathname):
return pathname
# If not found, just return the standard, unchanged path
return fname
def ReadFile(fname, binary=True):
"""Read and return the contents of a file.
Args:
fname: path to filename to read, where ## signifiies the chroot.
Returns:
data read from file, as a string.
"""
with open(Filename(fname), binary and 'rb' or 'r') as fd:
data = fd.read()
#self._out.Info("Read file '%s' size %d (%#0x)" %
#(fname, len(data), len(data)))
return data
def WriteFile(fname, data):
"""Write data into a file.
Args:
fname: path to filename to write
data: data to write to file, as a string
"""
#self._out.Info("Write file '%s' size %d (%#0x)" %
#(fname, len(data), len(data)))
with open(Filename(fname), 'wb') as fd:
fd.write(data)
def GetBytes(byte, size):
"""Get a string of bytes of a given size
This handles the unfortunate different between Python 2 and Python 2.
Args:
byte: Numeric byte value to use
size: Size of bytes/string to return
Returns:
A bytes type with 'byte' repeated 'size' times
"""
if sys.version_info[0] >= 3:
data = bytes([byte]) * size
else:
data = chr(byte) * size
return data
def ToUnicode(val):
"""Make sure a value is a unicode string
This allows some amount of compatibility between Python 2 and Python3. For
the former, it returns a unicode object.
Args:
val: string or unicode object
Returns:
unicode version of val
"""
if sys.version_info[0] >= 3:
return val
return val if isinstance(val, unicode) else val.decode('utf-8')
def FromUnicode(val):
"""Make sure a value is a non-unicode string
This allows some amount of compatibility between Python 2 and Python3. For
the former, it converts a unicode object to a string.
Args:
val: string or unicode object
Returns:
non-unicode version of val
"""
if sys.version_info[0] >= 3:
return val
return val if isinstance(val, str) else val.encode('utf-8')
def ToByte(ch):
"""Convert a character to an ASCII value
This is useful because in Python 2 bytes is an alias for str, but in
Python 3 they are separate types. This function converts the argument to
an ASCII value in either case.
Args:
ch: A string (Python 2) or byte (Python 3) value
Returns:
integer ASCII value for ch
"""
return ord(ch) if type(ch) == str else ch
def ToChar(byte):
"""Convert a byte to a character
This is useful because in Python 2 bytes is an alias for str, but in
Python 3 they are separate types. This function converts an ASCII value to
a value with the appropriate type in either case.
Args:
byte: A byte or str value
"""
return chr(byte) if type(byte) != str else byte
def ToChars(byte_list):
"""Convert a list of bytes to a str/bytes type
Args:
byte_list: List of ASCII values representing the string
Returns:
string made by concatenating all the ASCII values
"""
return ''.join([chr(byte) for byte in byte_list])
def ToBytes(string):
"""Convert a str type into a bytes type
Args:
string: string to convert
Returns:
Python 3: A bytes type
Python 2: A string type
"""
if sys.version_info[0] >= 3:
return string.encode('utf-8')
return string
def ToString(bval):
"""Convert a bytes type into a str type
Args:
bval: bytes value to convert
Returns:
Python 3: A bytes type
Python 2: A string type
"""
return bval.decode('utf-8')
def Compress(indata, algo, with_header=True):
"""Compress some data using a given algorithm
Note that for lzma this uses an old version of the algorithm, not that
provided by xz.
This requires 'lz4' and 'lzma_alone' tools. It also requires an output
directory to be previously set up, by calling PrepareOutputDir().
Args:
indata: Input data to compress
algo: Algorithm to use ('none', 'gzip', 'lz4' or 'lzma')
Returns:
Compressed data
"""
if algo == 'none':
return indata
fname = GetOutputFilename('%s.comp.tmp' % algo)
WriteFile(fname, indata)
if algo == 'lz4':
data = Run('lz4', '--no-frame-crc', '-c', fname, binary=True)
# cbfstool uses a very old version of lzma
elif algo == 'lzma':
outfname = GetOutputFilename('%s.comp.otmp' % algo)
Run('lzma_alone', 'e', fname, outfname, '-lc1', '-lp0', '-pb0', '-d8')
data = ReadFile(outfname)
elif algo == 'gzip':
data = Run('gzip', '-c', fname, binary=True)
else:
raise ValueError("Unknown algorithm '%s'" % algo)
if with_header:
hdr = struct.pack('<I', len(data))
data = hdr + data
return data
def Decompress(indata, algo, with_header=True):
"""Decompress some data using a given algorithm
Note that for lzma this uses an old version of the algorithm, not that
provided by xz.
This requires 'lz4' and 'lzma_alone' tools. It also requires an output
directory to be previously set up, by calling PrepareOutputDir().
Args:
indata: Input data to decompress
algo: Algorithm to use ('none', 'gzip', 'lz4' or 'lzma')
Returns:
Compressed data
"""
if algo == 'none':
return indata
if with_header:
data_len = struct.unpack('<I', indata[:4])[0]
indata = indata[4:4 + data_len]
fname = GetOutputFilename('%s.decomp.tmp' % algo)
with open(fname, 'wb') as fd:
fd.write(indata)
if algo == 'lz4':
data = Run('lz4', '-dc', fname, binary=True)
elif algo == 'lzma':
outfname = GetOutputFilename('%s.decomp.otmp' % algo)
Run('lzma_alone', 'd', fname, outfname)
data = ReadFile(outfname, binary=True)
elif algo == 'gzip':
data = Run('gzip', '-cd', fname, binary=True)
else:
raise ValueError("Unknown algorithm '%s'" % algo)
return data
CMD_CREATE, CMD_DELETE, CMD_ADD, CMD_REPLACE, CMD_EXTRACT = range(5)
IFWITOOL_CMDS = {
CMD_CREATE: 'create',
CMD_DELETE: 'delete',
CMD_ADD: 'add',
CMD_REPLACE: 'replace',
CMD_EXTRACT: 'extract',
}
def RunIfwiTool(ifwi_file, cmd, fname=None, subpart=None, entry_name=None):
"""Run ifwitool with the given arguments:
Args:
ifwi_file: IFWI file to operation on
cmd: Command to execute (CMD_...)
fname: Filename of file to add/replace/extract/create (None for
CMD_DELETE)
subpart: Name of sub-partition to operation on (None for CMD_CREATE)
entry_name: Name of directory entry to operate on, or None if none
"""
args = ['ifwitool', ifwi_file]
args.append(IFWITOOL_CMDS[cmd])
if fname:
args += ['-f', fname]
if subpart:
args += ['-n', subpart]
if entry_name:
args += ['-d', '-e', entry_name]
Run(*args)
def ToHex(val):
"""Convert an integer value (or None) to a string
Returns:
hex value, or 'None' if the value is None
"""
return 'None' if val is None else '%#x' % val
def ToHexSize(val):
"""Return the size of an object in hex
Returns:
hex value of size, or 'None' if the value is None
"""
return 'None' if val is None else '%#x' % len(val)