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-rw-r--r--tools/buildman/cfgutil.py235
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diff --git a/tools/buildman/cfgutil.py b/tools/buildman/cfgutil.py
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+# SPDX-License-Identifier: GPL-2.0+
+# Copyright 2022 Google LLC
+# Written by Simon Glass <sjg@chromium.org>
+#
+
+"""Utility functions for dealing with Kconfig .confing files"""
+
+import re
+
+from patman import tools
+
+RE_LINE = re.compile(r'(# )?CONFIG_([A-Z0-9_]+)(=(.*)| is not set)')
+RE_CFG = re.compile(r'(~?)(CONFIG_)?([A-Z0-9_]+)(=.*)?')
+
+def make_cfg_line(opt, adj):
+ """Make a new config line for an option
+
+ Args:
+ opt (str): Option to process, without CONFIG_ prefix
+ adj (str): Adjustment to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+
+ Returns:
+ str: New line to use, one of:
+ CONFIG_opt=y - option is enabled
+ # CONFIG_opt is not set - option is disabled
+ CONFIG_opt=val - option is getting a new value (val is
+ in quotes if this is a string)
+ """
+ if adj[0] == '~':
+ return f'# CONFIG_{opt} is not set'
+ if '=' in adj:
+ return f'CONFIG_{adj}'
+ return f'CONFIG_{opt}=y'
+
+def adjust_cfg_line(line, adjust_cfg, done=None):
+ """Make an adjustment to a single of line from a .config file
+
+ This processes a .config line, producing a new line if a change for this
+ CONFIG is requested in adjust_cfg
+
+ Args:
+ line (str): line to process, e.g. '# CONFIG_FRED is not set' or
+ 'CONFIG_FRED=y' or 'CONFIG_FRED=0x123' or 'CONFIG_FRED="fred"'
+ adjust_cfg (dict of str): Changes to make to .config file before
+ building:
+ key: str config to change, without the CONFIG_ prefix, e.g.
+ FRED
+ value: str change to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+ done (set of set): Adds the config option to this set if it is changed
+ in some way. This is used to track which ones have been processed.
+ None to skip.
+
+ Returns:
+ tuple:
+ str: New string for this line (maybe unchanged)
+ str: Adjustment string that was used
+ """
+ out_line = line
+ m_line = RE_LINE.match(line)
+ adj = None
+ if m_line:
+ _, opt, _, _ = m_line.groups()
+ adj = adjust_cfg.get(opt)
+ if adj:
+ out_line = make_cfg_line(opt, adj)
+ if done is not None:
+ done.add(opt)
+
+ return out_line, adj
+
+def adjust_cfg_lines(lines, adjust_cfg):
+ """Make adjustments to a list of lines from a .config file
+
+ Args:
+ lines (list of str): List of lines to process
+ adjust_cfg (dict of str): Changes to make to .config file before
+ building:
+ key: str config to change, without the CONFIG_ prefix, e.g.
+ FRED
+ value: str change to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+
+ Returns:
+ list of str: New list of lines resulting from the processing
+ """
+ out_lines = []
+ done = set()
+ for line in lines:
+ out_line, _ = adjust_cfg_line(line, adjust_cfg, done)
+ out_lines.append(out_line)
+
+ for opt in adjust_cfg:
+ if opt not in done:
+ adj = adjust_cfg.get(opt)
+ out_line = make_cfg_line(opt, adj)
+ out_lines.append(out_line)
+
+ return out_lines
+
+def adjust_cfg_file(fname, adjust_cfg):
+ """Make adjustments to a .config file
+
+ Args:
+ fname (str): Filename of .config file to change
+ adjust_cfg (dict of str): Changes to make to .config file before
+ building:
+ key: str config to change, without the CONFIG_ prefix, e.g.
+ FRED
+ value: str change to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+ """
+ lines = tools.ReadFile(fname, binary=False).splitlines()
+ out_lines = adjust_cfg_lines(lines, adjust_cfg)
+ out = '\n'.join(out_lines) + '\n'
+ tools.WriteFile(fname, out, binary=False)
+
+def convert_list_to_dict(adjust_cfg_list):
+ """Convert a list of config changes into the dict used by adjust_cfg_file()
+
+ Args:
+ adjust_cfg_list (list of str): List of changes to make to .config file
+ before building. Each is one of (where C is the config option with
+ or without the CONFIG_ prefix)
+
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig
+
+ Returns:
+ dict of str: Changes to make to .config file before building:
+ key: str config to change, without the CONFIG_ prefix, e.g. FRED
+ value: str change to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+
+ Raises:
+ ValueError: if an item in adjust_cfg_list has invalid syntax
+ """
+ result = {}
+ for cfg in adjust_cfg_list or []:
+ m_cfg = RE_CFG.match(cfg)
+ if not m_cfg:
+ raise ValueError(f"Invalid CONFIG adjustment '{cfg}'")
+ negate, _, opt, val = m_cfg.groups()
+ result[opt] = f'%s{opt}%s' % (negate or '', val or '')
+
+ return result
+
+def check_cfg_lines(lines, adjust_cfg):
+ """Check that lines do not conflict with the requested changes
+
+ If a line enables a CONFIG which was requested to be disabled, etc., then
+ this is an error. This function finds such errors.
+
+ Args:
+ lines (list of str): List of lines to process
+ adjust_cfg (dict of str): Changes to make to .config file before
+ building:
+ key: str config to change, without the CONFIG_ prefix, e.g.
+ FRED
+ value: str change to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+
+ Returns:
+ list of tuple: list of errors, each a tuple:
+ str: cfg adjustment requested
+ str: line of the config that conflicts
+ """
+ bad = []
+ done = set()
+ for line in lines:
+ out_line, adj = adjust_cfg_line(line, adjust_cfg, done)
+ if out_line != line:
+ bad.append([adj, line])
+
+ for opt in adjust_cfg:
+ if opt not in done:
+ adj = adjust_cfg.get(opt)
+ out_line = make_cfg_line(opt, adj)
+ bad.append([adj, f'Missing expected line: {out_line}'])
+
+ return bad
+
+def check_cfg_file(fname, adjust_cfg):
+ """Check that a config file has been adjusted according to adjust_cfg
+
+ Args:
+ fname (str): Filename of .config file to change
+ adjust_cfg (dict of str): Changes to make to .config file before
+ building:
+ key: str config to change, without the CONFIG_ prefix, e.g.
+ FRED
+ value: str change to make (C is config option without prefix):
+ C to enable C
+ ~C to disable C
+ C=val to set the value of C (val must have quotes if C is
+ a string Kconfig)
+
+ Returns:
+ str: None if OK, else an error string listing the problems
+ """
+ lines = tools.ReadFile(fname, binary=False).splitlines()
+ bad_cfgs = check_cfg_lines(lines, adjust_cfg)
+ if bad_cfgs:
+ out = [f'{cfg:20} {line}' for cfg, line in bad_cfgs]
+ content = '\\n'.join(out)
+ return f'''
+Some CONFIG adjustments did not take effect. This may be because
+the request CONFIGs do not exist or conflict with others.
+
+Failed adjustments:
+
+{content}
+'''
+ return None
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