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#!/usr/bin/python3
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#
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# check-kabi - Red Hat kABI reference checking tool
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#
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# We use this script to check against reference Module.kabi files.
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#
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# Author: Jon Masters <jcm@redhat.com>
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# Copyright (C) 2007-2009 Red Hat, Inc.
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#
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# This software may be freely redistributed under the terms of the GNU
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# General Public License (GPL).
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# Changelog:
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#
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# 2018/06/01 - Update for python3 by Petr Oros.
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# 2009/08/15 - Updated for use in RHEL6.
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# 2007/06/13 - Initial rewrite in python by Jon Masters.
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__author__ = "Jon Masters <jcm@redhat.com>"
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__version__ = "2.0"
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__date__ = "2009/08/15"
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__copyright__ = "Copyright (C) 2007-2009 Red Hat, Inc"
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__license__ = "GPL"
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import getopt
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import string
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import sys
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true = 1
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false = 0
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def load_symvers(symvers, filename):
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    """Load a Module.symvers file."""
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    symvers_file = open(filename, "r")
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    while true:
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        in_line = symvers_file.readline()
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        if in_line == "":
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            break
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        if in_line == "\n":
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            continue
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        checksum, symbol, directory, type = in_line.split()
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        symvers[symbol] = in_line[0:-1]
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def load_kabi(kabi, filename):
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    """Load a Module.kabi file."""
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    kabi_file = open(filename, "r")
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    while true:
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        in_line = kabi_file.readline()
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        if in_line == "":
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            break
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        if in_line == "\n":
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            continue
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        checksum, symbol, directory, type = in_line.split()
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        kabi[symbol] = in_line[0:-1]
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def check_kabi(symvers, kabi):
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    """Check Module.kabi and Module.symvers files."""
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    fail = 0
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    warn = 0
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    changed_symbols = []
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    moved_symbols = []
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    for symbol in kabi:
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        abi_hash, abi_sym, abi_dir, abi_type = kabi[symbol].split()
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        if symbol in symvers:
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            sym_hash, sym_sym, sym_dir, sym_type = symvers[symbol].split()
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            if abi_hash != sym_hash:
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                fail = 1
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                changed_symbols.append(symbol)
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            if abi_dir != sym_dir:
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                warn = 1
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                moved_symbols.append(symbol)
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        else:
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            fail = 1
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            changed_symbols.append(symbol)
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    if fail:
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        print("*** ERROR - ABI BREAKAGE WAS DETECTED ***")
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        print("")
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        print("The following symbols have been changed (this will cause an ABI breakage):")
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        print("")
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        for symbol in changed_symbols:
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            print(symbol)
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        print("")
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    if warn:
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        print("*** WARNING - ABI SYMBOLS MOVED ***")
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        print("")
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        print("The following symbols moved (typically caused by moving a symbol from being")
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        print("provided by the kernel vmlinux out to a loadable module):")
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        print("")
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        for symbol in moved_symbols:
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            print(symbol)
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        print("")
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    """Halt the build, if we got errors and/or warnings. In either case,
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       double-checkig is required to avoid introducing / concealing
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       KABI inconsistencies."""
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    if fail or warn:
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        sys.exit(1)
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    sys.exit(0)
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def usage():
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    print("""
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check-kabi: check Module.kabi and Module.symvers files.
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    check-kabi [ -k Module.kabi ] [ -s Module.symvers ]
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""")
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if __name__ == "__main__":
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    symvers_file = ""
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    kabi_file = ""
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    opts, args = getopt.getopt(sys.argv[1:], 'hk:s:')
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    for o, v in opts:
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        if o == "-s":
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            symvers_file = v
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        if o == "-h":
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            usage()
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            sys.exit(0)
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        if o == "-k":
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            kabi_file = v
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    if (symvers_file == "") or (kabi_file == ""):
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        usage()
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        sys.exit(1)
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    symvers = {}
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    kabi = {}
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    load_symvers(symvers, symvers_file)
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    load_kabi(kabi, kabi_file)
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    check_kabi(symvers, kabi)