89 lines
2.7 KiB
Python
89 lines
2.7 KiB
Python
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#!/usr/bin/python3
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# SPDX-License-Identifier: GPL-2.0
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# Author: Clark Williams <williams@redhat.com>
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# Copyright (C) 2022 Red Hat, Inc.
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#
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# merge.py - a direct replacement for merge.pl in the redhat/configs directory
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#
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# invocation: python merge.py overrides baseconfig [arch]
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#
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# This script merges two kernel configuration files, an override file and a
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# base config file and writes the results to stdout.
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#
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# The script reads the overrides into a dictionary, then reads the baseconfig
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# file, looking for overrides and replacing any found, then printing the result
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# to stdout. Finally any remaining (new) configs in the override are appended to the
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# end of the output
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import sys
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import re
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import os.path
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def usage(msg):
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'''print a usage message and exit'''
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sys.stderr.write(msg + "\n")
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sys.stderr.write("usage: merge.py overrides baseconfig [arch]\n")
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sys.exit(1)
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isset = re.compile(r'^(CONFIG_\w+)=')
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notset = re.compile(r'^#\s+(CONFIG_\w+)\s+is not set')
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# search an input line for a config (set or notset) pattern
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# if we get a match return the config that is being changed
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def find_config(line):
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'''find a configuration line in the input and return the config name'''
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m = isset.match(line)
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if (m is not None):
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return m.group(1)
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m = notset.match(line)
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if (m is not None):
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return m.group(1)
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return None
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#########################################################
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if len(sys.argv) < 3:
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usage("must have two input files")
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override_file = sys.argv[1]
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baseconfig_file = sys.argv[2]
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if not os.path.exists(override_file):
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usage(f"overrides config file {override_file:s} does not exist!")
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if not os.path.exists(baseconfig_file):
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usage(f"base configs file {baseconfig_file:s} does not exist")
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if len(sys.argv) == 4:
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print(f"# {sys.argv[3]:s}")
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# read each line of the override file and store any configuration values
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# in the overrides dictionary, keyed by the configuration name.
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overrides = {}
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with open(override_file, "rt", encoding="utf-8") as f:
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for line in [l.strip() for l in f.readlines()]:
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c = find_config(line)
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if c and c not in overrides:
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overrides[c] = line
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# now read and print the base config, checking each line
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# that defines a config value and printing the override if
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# it exists
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with open(baseconfig_file, "rt", encoding="utf-8") as f:
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for line in [ l.strip() for l in f.readlines() ]:
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c = find_config(line)
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if c and c in overrides:
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print(overrides[c])
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del overrides[c]
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else:
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print(line)
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# print out the remaining configs (new values)
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# from the overrides file
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for v in overrides.values():
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print (v)
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sys.exit(0)
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