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19133b7184
At present the only straightforward way to write tests that need a slightly different configuration is to create a new board with its own configuration. This is cumbersome. It would be useful if buildman could adjust the configuration of a build on the fly. In preparation for this, add a utility library which can modify a .config file according to various parameters passed to it. Signed-off-by: Simon Glass <sjg@chromium.org>
235 lines
8.1 KiB
Python
235 lines
8.1 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright 2022 Google LLC
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# Written by Simon Glass <sjg@chromium.org>
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#
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"""Utility functions for dealing with Kconfig .confing files"""
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import re
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from patman import tools
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RE_LINE = re.compile(r'(# )?CONFIG_([A-Z0-9_]+)(=(.*)| is not set)')
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RE_CFG = re.compile(r'(~?)(CONFIG_)?([A-Z0-9_]+)(=.*)?')
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def make_cfg_line(opt, adj):
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"""Make a new config line for an option
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Args:
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opt (str): Option to process, without CONFIG_ prefix
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adj (str): Adjustment to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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Returns:
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str: New line to use, one of:
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CONFIG_opt=y - option is enabled
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# CONFIG_opt is not set - option is disabled
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CONFIG_opt=val - option is getting a new value (val is
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in quotes if this is a string)
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"""
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if adj[0] == '~':
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return f'# CONFIG_{opt} is not set'
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if '=' in adj:
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return f'CONFIG_{adj}'
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return f'CONFIG_{opt}=y'
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def adjust_cfg_line(line, adjust_cfg, done=None):
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"""Make an adjustment to a single of line from a .config file
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This processes a .config line, producing a new line if a change for this
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CONFIG is requested in adjust_cfg
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Args:
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line (str): line to process, e.g. '# CONFIG_FRED is not set' or
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'CONFIG_FRED=y' or 'CONFIG_FRED=0x123' or 'CONFIG_FRED="fred"'
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adjust_cfg (dict of str): Changes to make to .config file before
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building:
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key: str config to change, without the CONFIG_ prefix, e.g.
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FRED
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value: str change to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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done (set of set): Adds the config option to this set if it is changed
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in some way. This is used to track which ones have been processed.
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None to skip.
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Returns:
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tuple:
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str: New string for this line (maybe unchanged)
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str: Adjustment string that was used
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"""
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out_line = line
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m_line = RE_LINE.match(line)
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adj = None
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if m_line:
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_, opt, _, _ = m_line.groups()
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adj = adjust_cfg.get(opt)
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if adj:
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out_line = make_cfg_line(opt, adj)
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if done is not None:
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done.add(opt)
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return out_line, adj
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def adjust_cfg_lines(lines, adjust_cfg):
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"""Make adjustments to a list of lines from a .config file
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Args:
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lines (list of str): List of lines to process
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adjust_cfg (dict of str): Changes to make to .config file before
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building:
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key: str config to change, without the CONFIG_ prefix, e.g.
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FRED
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value: str change to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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Returns:
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list of str: New list of lines resulting from the processing
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"""
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out_lines = []
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done = set()
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for line in lines:
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out_line, _ = adjust_cfg_line(line, adjust_cfg, done)
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out_lines.append(out_line)
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for opt in adjust_cfg:
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if opt not in done:
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adj = adjust_cfg.get(opt)
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out_line = make_cfg_line(opt, adj)
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out_lines.append(out_line)
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return out_lines
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def adjust_cfg_file(fname, adjust_cfg):
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"""Make adjustments to a .config file
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Args:
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fname (str): Filename of .config file to change
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adjust_cfg (dict of str): Changes to make to .config file before
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building:
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key: str config to change, without the CONFIG_ prefix, e.g.
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FRED
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value: str change to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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"""
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lines = tools.ReadFile(fname, binary=False).splitlines()
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out_lines = adjust_cfg_lines(lines, adjust_cfg)
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out = '\n'.join(out_lines) + '\n'
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tools.WriteFile(fname, out, binary=False)
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def convert_list_to_dict(adjust_cfg_list):
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"""Convert a list of config changes into the dict used by adjust_cfg_file()
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Args:
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adjust_cfg_list (list of str): List of changes to make to .config file
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before building. Each is one of (where C is the config option with
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or without the CONFIG_ prefix)
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig
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Returns:
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dict of str: Changes to make to .config file before building:
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key: str config to change, without the CONFIG_ prefix, e.g. FRED
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value: str change to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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Raises:
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ValueError: if an item in adjust_cfg_list has invalid syntax
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"""
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result = {}
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for cfg in adjust_cfg_list or []:
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m_cfg = RE_CFG.match(cfg)
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if not m_cfg:
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raise ValueError(f"Invalid CONFIG adjustment '{cfg}'")
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negate, _, opt, val = m_cfg.groups()
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result[opt] = f'%s{opt}%s' % (negate or '', val or '')
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return result
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def check_cfg_lines(lines, adjust_cfg):
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"""Check that lines do not conflict with the requested changes
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If a line enables a CONFIG which was requested to be disabled, etc., then
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this is an error. This function finds such errors.
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Args:
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lines (list of str): List of lines to process
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adjust_cfg (dict of str): Changes to make to .config file before
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building:
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key: str config to change, without the CONFIG_ prefix, e.g.
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FRED
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value: str change to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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Returns:
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list of tuple: list of errors, each a tuple:
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str: cfg adjustment requested
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str: line of the config that conflicts
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"""
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bad = []
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done = set()
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for line in lines:
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out_line, adj = adjust_cfg_line(line, adjust_cfg, done)
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if out_line != line:
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bad.append([adj, line])
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for opt in adjust_cfg:
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if opt not in done:
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adj = adjust_cfg.get(opt)
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out_line = make_cfg_line(opt, adj)
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bad.append([adj, f'Missing expected line: {out_line}'])
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return bad
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def check_cfg_file(fname, adjust_cfg):
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"""Check that a config file has been adjusted according to adjust_cfg
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Args:
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fname (str): Filename of .config file to change
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adjust_cfg (dict of str): Changes to make to .config file before
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building:
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key: str config to change, without the CONFIG_ prefix, e.g.
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FRED
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value: str change to make (C is config option without prefix):
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C to enable C
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~C to disable C
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C=val to set the value of C (val must have quotes if C is
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a string Kconfig)
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Returns:
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str: None if OK, else an error string listing the problems
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"""
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lines = tools.ReadFile(fname, binary=False).splitlines()
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bad_cfgs = check_cfg_lines(lines, adjust_cfg)
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if bad_cfgs:
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out = [f'{cfg:20} {line}' for cfg, line in bad_cfgs]
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content = '\\n'.join(out)
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return f'''
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Some CONFIG adjustments did not take effect. This may be because
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the request CONFIGs do not exist or conflict with others.
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Failed adjustments:
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{content}
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'''
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return None
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