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u-boot/tools/u_boot_pylib/tools.py
Simon Glass 4583c00236 patman: Move library functions into a library directory 
The patman directory has a number of modules which are used by other tools
in U-Boot. This makes it hard to package the tools using pypi since the
common files must be copied along with the tool that uses them.

To address this, move these files into a new u_boot_pylib library. This
can be packaged separately and listed as a dependency of each tool.

Signed-off-by: Simon Glass <sjg@chromium.org>
2023-03-08 11:40:49 -08:00

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# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (c) 2016 Google, Inc
#
import glob
import os
import shlex
import shutil
import sys
import tempfile
import urllib.request
from u_boot_pylib import command
from u_boot_pylib 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 prepare_output_dir(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 ValueError(
f"Cannot make output directory 'outdir': 'err.strerror'")
tout.debug("Using output directory '%s'" % outdir)
else:
outdir = tempfile.mkdtemp(prefix='binman.')
tout.debug("Using temporary directory '%s'" % outdir)
def _remove_output_dir():
global outdir
shutil.rmtree(outdir)
tout.debug("Deleted temporary directory '%s'" % outdir)
outdir = None
def finalise_output_dir():
global outdir, preserve_outdir
"""Tidy up: delete output directory if temporary and not preserved."""
if outdir and not preserve_outdir:
_remove_output_dir()
outdir = None
def get_output_filename(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 get_output_dir():
"""Return the current output directory
Returns:
str: The output directory
"""
return outdir
def _finalise_for_test():
"""Remove the output directory (for use by tests)"""
global outdir
if outdir:
_remove_output_dir()
outdir = None
def set_input_dirs(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 get_input_filename(fname, allow_missing=False):
"""Return a filename for use as input.
Args:
fname: Filename to use for new file
allow_missing: True if the filename can be missing
Returns:
fname, if indir is None;
full path of the filename, within the input directory;
None, if file is missing and allow_missing is True
Raises:
ValueError if file is missing and allow_missing is False
"""
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
if allow_missing:
return None
raise ValueError("Filename '%s' not found in input path (%s) (cwd='%s')" %
(fname, ','.join(indir), os.getcwd()))
def get_input_filename_glob(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(pattern)
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 not_power_of_two(num):
return num and (num & (num - 1))
def set_tool_paths(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 path_has_file(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 get_host_compile_tool(env, name):
"""Get the host-specific version for a compile tool
This checks the environment variables that specify which version of
the tool should be used (e.g. ${HOSTCC}).
The following table lists the host-specific versions of the tools
this function resolves to:
Compile Tool | Host version
--------------+----------------
as | ${HOSTAS}
ld | ${HOSTLD}
cc | ${HOSTCC}
cpp | ${HOSTCPP}
c++ | ${HOSTCXX}
ar | ${HOSTAR}
nm | ${HOSTNM}
ldr | ${HOSTLDR}
strip | ${HOSTSTRIP}
objcopy | ${HOSTOBJCOPY}
objdump | ${HOSTOBJDUMP}
dtc | ${HOSTDTC}
Args:
name: Command name to run
Returns:
host_name: Exact command name to run instead
extra_args: List of extra arguments to pass
"""
host_name = None
extra_args = []
if name in ('as', 'ld', 'cc', 'cpp', 'ar', 'nm', 'ldr', 'strip',
'objcopy', 'objdump', 'dtc'):
host_name, *host_args = env.get('HOST' + name.upper(), '').split(' ')
elif name == 'c++':
host_name, *host_args = env.get('HOSTCXX', '').split(' ')
if host_name:
return host_name, extra_args
return name, []
def get_target_compile_tool(name, cross_compile=None):
"""Get the target-specific version for a compile tool
This first checks the environment variables that specify which
version of the tool should be used (e.g. ${CC}). If those aren't
specified, it checks the CROSS_COMPILE variable as a prefix for the
tool with some substitutions (e.g. "${CROSS_COMPILE}gcc" for cc).
The following table lists the target-specific versions of the tools
this function resolves to:
Compile Tool | First choice | Second choice
--------------+----------------+----------------------------
as | ${AS} | ${CROSS_COMPILE}as
ld | ${LD} | ${CROSS_COMPILE}ld.bfd
| | or ${CROSS_COMPILE}ld
cc | ${CC} | ${CROSS_COMPILE}gcc
cpp | ${CPP} | ${CROSS_COMPILE}gcc -E
c++ | ${CXX} | ${CROSS_COMPILE}g++
ar | ${AR} | ${CROSS_COMPILE}ar
nm | ${NM} | ${CROSS_COMPILE}nm
ldr | ${LDR} | ${CROSS_COMPILE}ldr
strip | ${STRIP} | ${CROSS_COMPILE}strip
objcopy | ${OBJCOPY} | ${CROSS_COMPILE}objcopy
objdump | ${OBJDUMP} | ${CROSS_COMPILE}objdump
dtc | ${DTC} | (no CROSS_COMPILE version)
Args:
name: Command name to run
Returns:
target_name: Exact command name to run instead
extra_args: List of extra arguments to pass
"""
env = dict(os.environ)
target_name = None
extra_args = []
if name in ('as', 'ld', 'cc', 'cpp', 'ar', 'nm', 'ldr', 'strip',
'objcopy', 'objdump', 'dtc'):
target_name, *extra_args = env.get(name.upper(), '').split(' ')
elif name == 'c++':
target_name, *extra_args = env.get('CXX', '').split(' ')
if target_name:
return target_name, extra_args
if cross_compile is None:
cross_compile = env.get('CROSS_COMPILE', '')
if name in ('as', 'ar', 'nm', 'ldr', 'strip', 'objcopy', 'objdump'):
target_name = cross_compile + name
elif name == 'ld':
try:
if run(cross_compile + 'ld.bfd', '-v'):
target_name = cross_compile + 'ld.bfd'
except:
target_name = cross_compile + 'ld'
elif name == 'cc':
target_name = cross_compile + 'gcc'
elif name == 'cpp':
target_name = cross_compile + 'gcc'
extra_args = ['-E']
elif name == 'c++':
target_name = cross_compile + 'g++'
else:
target_name = name
return target_name, extra_args
def get_env_with_path():
"""Get an updated environment with the PATH variable set correctly
If there are any search paths set, these need to come first in the PATH so
that these override any other version of the tools.
Returns:
dict: New environment with PATH updated, or None if there are not search
paths
"""
if tool_search_paths:
env = dict(os.environ)
env['PATH'] = ':'.join(tool_search_paths) + ':' + env['PATH']
return env
def run_result(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
for_host: True to resolve the command to the version for the host
for_target: False to run the command as-is, without resolving it
to the version for the compile target
raise_on_error: Raise an error if the command fails (True by default)
Returns:
CommandResult object
"""
try:
binary = kwargs.get('binary')
for_host = kwargs.get('for_host', False)
for_target = kwargs.get('for_target', not for_host)
raise_on_error = kwargs.get('raise_on_error', True)
env = get_env_with_path()
if for_target:
name, extra_args = get_target_compile_tool(name)
args = tuple(extra_args) + args
elif for_host:
name, extra_args = get_host_compile_tool(env, name)
args = tuple(extra_args) + args
name = os.path.expanduser(name) # Expand paths containing ~
all_args = (name,) + args
result = command.run_pipe([all_args], capture=True, capture_stderr=True,
env=env, raise_on_error=False, binary=binary)
if result.return_code:
if raise_on_error:
raise ValueError("Error %d running '%s': %s" %
(result.return_code,' '.join(all_args),
result.stderr or result.stdout))
return result
except ValueError:
if env and not path_has_file(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 tool_find(name):
"""Search the current path for a tool
This uses both PATH and any value from set_tool_paths() to search for a tool
Args:
name (str): Name of tool to locate
Returns:
str: Full path to tool if found, else None
"""
name = os.path.expanduser(name) # Expand paths containing ~
paths = []
pathvar = os.environ.get('PATH')
if pathvar:
paths = pathvar.split(':')
if tool_search_paths:
paths += tool_search_paths
for path in paths:
fname = os.path.join(path, name)
if os.path.isfile(fname) and os.access(fname, os.X_OK):
return fname
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
for_host: True to resolve the command to the version for the host
for_target: False to run the command as-is, without resolving it
to the version for the compile target
Returns:
CommandResult object
"""
result = run_result(name, *args, **kwargs)
if result is not None:
return result.stdout
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 read_file(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 write_file(fname, data, binary=True):
"""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), binary and 'wb' or 'w') as fd:
fd.write(data)
def get_bytes(byte, size):
"""Get a string of bytes of a given size
Args:
byte: Numeric byte value to use
size: Size of bytes/string to return
Returns:
A bytes type with 'byte' repeated 'size' times
"""
return bytes([byte]) * size
def to_bytes(string):
"""Convert a str type into a bytes type
Args:
string: string to convert
Returns:
A bytes type
"""
return string.encode('utf-8')
def to_string(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 to_hex(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 to_hex_size(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)
def print_full_help(fname):
"""Print the full help message for a tool using an appropriate pager.
Args:
fname: Path to a file containing the full help message
"""
pager = shlex.split(os.getenv('PAGER', ''))
if not pager:
lesspath = shutil.which('less')
pager = [lesspath] if lesspath else None
if not pager:
pager = ['more']
command.run(*pager, fname)
def download(url, tmpdir_pattern='.patman'):
"""Download a file to a temporary directory
Args:
url (str): URL to download
tmpdir_pattern (str): pattern to use for the temporary directory
Returns:
Tuple:
Full path to the downloaded archive file in that directory,
or None if there was an error while downloading
Temporary directory name
"""
print('- downloading: %s' % url)
leaf = url.split('/')[-1]
tmpdir = tempfile.mkdtemp(tmpdir_pattern)
response = urllib.request.urlopen(url)
fname = os.path.join(tmpdir, leaf)
fd = open(fname, 'wb')
meta = response.info()
size = int(meta.get('Content-Length'))
done = 0
block_size = 1 << 16
status = ''
# Read the file in chunks and show progress as we go
while True:
buffer = response.read(block_size)
if not buffer:
print(chr(8) * (len(status) + 1), '\r', end=' ')
break
done += len(buffer)
fd.write(buffer)
status = r'%10d MiB [%3d%%]' % (done // 1024 // 1024,
done * 100 // size)
status = status + chr(8) * (len(status) + 1)
print(status, end=' ')
sys.stdout.flush()
print('\r', end='')
sys.stdout.flush()
fd.close()
if done != size:
print('Error, failed to download')
os.remove(fname)
fname = None
return fname, tmpdir
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