gdb/copyright.py

   1 #! /usr/bin/env python
   2
   3 # Copyright (C) 2011-2015 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GDB.
   6 #
   7 # This program is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 """copyright.py
  21
  22 This script updates the list of years in the copyright notices in
  23 most files maintained by the GDB project.
  24
  25 Usage: cd src/gdb && python copyright.py
  26
  27 Always review the output of this script before committing it!
  28 A useful command to review the output is:
  29     % filterdiff -x \*.c -x \*.cc -x \*.h -x \*.exp updates.diff
  30 This removes the bulk of the changes which are most likely to be correct.
  31 """
  32
  33 import datetime
  34 import os
  35 import os.path
  36 import subprocess
  37
  38
  39 def get_update_list():
  40     """Return the list of files to update.
  41
  42     Assumes that the current working directory when called is the root
  43     of the GDB source tree (NOT the gdb/ subdirectory!).  The names of
  44     the files are relative to that root directory.
  45     """
  46     result = []
  47     for gdb_dir in ('gdb', 'sim', 'include/gdb'):
  48         for root, dirs, files in os.walk(gdb_dir, topdown=True):
  49             for dirname in dirs:
  50                 reldirname = "%s/%s" % (root, dirname)
  51                 if (dirname in EXCLUDE_ALL_LIST
  52                     or reldirname in EXCLUDE_LIST
  53                     or reldirname in NOT_FSF_LIST
  54                     or reldirname in BY_HAND):
  55                     # Prune this directory from our search list.
  56                     dirs.remove(dirname)
  57             for filename in files:
  58                 relpath = "%s/%s" % (root, filename)
  59                 if (filename in EXCLUDE_ALL_LIST
  60                     or relpath in EXCLUDE_LIST
  61                     or relpath in NOT_FSF_LIST
  62                     or relpath in BY_HAND):
  63                     # Ignore this file.
  64                     pass
  65                 else:
  66                     result.append(relpath)
  67     return result
  68
  69
  70 def update_files(update_list):
  71     """Update the copyright header of the files in the given list.
  72
  73     We use gnulib's update-copyright script for that.
  74     """
  75     # We want to use year intervals in the copyright notices, and
  76     # all years should be collapsed to one single year interval,
  77     # even if there are "holes" in the list of years found in the
  78     # original copyright notice (OK'ed by the FSF, case [gnu.org #719834]).
  79     os.environ['UPDATE_COPYRIGHT_USE_INTERVALS'] = '2'
  80
  81     # Perform the update, and save the output in a string.
  82     update_cmd = ['bash', 'gdb/gnulib/import/extra/update-copyright']
  83     update_cmd += update_list
  84
  85     p = subprocess.Popen(update_cmd, stdout=subprocess.PIPE,
  86                          stderr=subprocess.STDOUT)
  87     update_out = p.communicate()[0]
  88
  89     # Process the output.  Typically, a lot of files do not have
  90     # a copyright notice :-(.  The update-copyright script prints
  91     # a well defined warning when it did not find the copyright notice.
  92     # For each of those, do a sanity check and see if they may in fact
  93     # have one.  For the files that are found not to have one, we filter
  94     # the line out from the output, since there is nothing more to do,
  95     # short of looking at each file and seeing which notice is appropriate.
  96     # Too much work! (~4,000 files listed as of 2012-01-03).
  97     update_out = update_out.splitlines()
  98     warning_string = ': warning: copyright statement not found'
  99     warning_len = len(warning_string)
 100
 101     for line in update_out:
 102         if line.endswith('\n'):
 103             line = line[:-1]
 104         if line.endswith(warning_string):
 105             filename = line[:-warning_len]
 106             if may_have_copyright_notice(filename):
 107                 print line
 108         else:
 109             # Unrecognized file format. !?!
 110             print "*** " + line
 111
 112
 113 def may_have_copyright_notice(filename):
 114     """Check that the given file does not seem to have a copyright notice.
 115
 116     The filename is relative to the root directory.
 117     This function assumes that the current working directory is that root
 118     directory.
 119
 120     The algorigthm is fairly crude, meaning that it might return
 121     some false positives.  I do not think it will return any false
 122     negatives...  We might improve this function to handle more
 123     complex cases later...
 124     """
 125     # For now, it may have a copyright notice if we find the word
 126     # "Copyright" at the (reasonable) start of the given file, say
 127     # 50 lines...
 128     MAX_LINES = 50
 129
 130     fd = open(filename)
 131
 132     lineno = 1
 133     for line in fd:
 134         if 'Copyright' in line:
 135             return True
 136         lineno += 1
 137         if lineno > 50:
 138             return False
 139     return False
 140
 141
 142 def main ():
 143     """The main subprogram."""
 144     if not os.path.isfile("gnulib/import/extra/update-copyright"):
 145         print "Error: This script must be called from the gdb directory."
 146     root_dir = os.path.dirname(os.getcwd())
 147     os.chdir(root_dir)
 148
 149     update_list = get_update_list()
 150     update_files (update_list)
 151
 152     # Remind the user that some files need to be updated by HAND...
 153     if BY_HAND:
 154         print
 155         print "\033[31mREMINDER: The following files must be updated by hand." \
 156               "\033[0m"
 157         for filename in BY_HAND + MULTIPLE_COPYRIGHT_HEADERS:
 158             print "  ", filename
 159
 160 ############################################################################
 161 #
 162 # Some constants, placed at the end because they take up a lot of room.
 163 # The actual value of these constants is not significant to the understanding
 164 # of the script.
 165 #
 166 ############################################################################
 167
 168 # Files which should not be modified, either because they are
 169 # generated, non-FSF, or otherwise special (e.g. license text,
 170 # or test cases which must be sensitive to line numbering).
 171 #
 172 # Filenames are relative to the root directory.
 173 EXCLUDE_LIST = (
 174     'gdb/nat/glibc_thread_db.h',
 175     'gdb/CONTRIBUTE',
 176     'gdb/gnulib/import'
 177 )
 178
 179 # Files which should not be modified, either because they are
 180 # generated, non-FSF, or otherwise special (e.g. license text,
 181 # or test cases which must be sensitive to line numbering).
 182 #
 183 # Matches any file or directory name anywhere.  Use with caution.
 184 # This is mostly for files that can be found in multiple directories.
 185 # Eg: We want all files named COPYING to be left untouched.
 186
 187 EXCLUDE_ALL_LIST = (
 188     "COPYING", "COPYING.LIB", "CVS", "configure", "copying.c",
 189     "fdl.texi", "gpl.texi", "aclocal.m4",
 190 )
 191
 192 # The list of files to update by hand.
 193 BY_HAND = (
 194     # These files are sensitive to line numbering.
 195     "gdb/testsuite/gdb.base/step-line.inp",
 196     "gdb/testsuite/gdb.base/step-line.c",
 197 )
 198
 199 # Files containing multiple copyright headers.  This script is only
 200 # fixing the first one it finds, so we need to finish the update
 201 # by hand.
 202 MULTIPLE_COPYRIGHT_HEADERS = (
 203     "gdb/doc/gdb.texinfo",
 204     "gdb/doc/refcard.tex",
 205     "gdb/gdbarch.sh",
 206 )
 207
 208 # The list of file which have a copyright, but not head by the FSF.
 209 # Filenames are relative to the root directory.
 210 NOT_FSF_LIST = (
 211     "gdb/exc_request.defs",
 212     "gdb/gdbtk",
 213     "gdb/testsuite/gdb.gdbtk/",
 214     "sim/arm/armemu.h", "sim/arm/armos.c", "sim/arm/gdbhost.c",
 215     "sim/arm/dbg_hif.h", "sim/arm/dbg_conf.h", "sim/arm/communicate.h",
 216     "sim/arm/armos.h", "sim/arm/armcopro.c", "sim/arm/armemu.c",
 217     "sim/arm/kid.c", "sim/arm/thumbemu.c", "sim/arm/armdefs.h",
 218     "sim/arm/armopts.h", "sim/arm/dbg_cp.h", "sim/arm/dbg_rdi.h",
 219     "sim/arm/parent.c", "sim/arm/armsupp.c", "sim/arm/armrdi.c",
 220     "sim/arm/bag.c", "sim/arm/armvirt.c", "sim/arm/main.c", "sim/arm/bag.h",
 221     "sim/arm/communicate.c", "sim/arm/gdbhost.h", "sim/arm/armfpe.h",
 222     "sim/arm/arminit.c",
 223     "sim/common/cgen-fpu.c", "sim/common/cgen-fpu.h",
 224     "sim/common/cgen-accfp.c",
 225     "sim/mips/m16run.c", "sim/mips/sim-main.c",
 226     "sim/moxie/moxie-gdb.dts",
 227     # Not a single file in sim/ppc/ appears to be copyright FSF :-(.
 228     "sim/ppc/filter.h", "sim/ppc/gen-support.h", "sim/ppc/ld-insn.h",
 229     "sim/ppc/hw_sem.c", "sim/ppc/hw_disk.c", "sim/ppc/idecode_branch.h",
 230     "sim/ppc/sim-endian.h", "sim/ppc/table.c", "sim/ppc/hw_core.c",
 231     "sim/ppc/gen-support.c", "sim/ppc/gen-semantics.h", "sim/ppc/cpu.h",
 232     "sim/ppc/sim_callbacks.h", "sim/ppc/RUN", "sim/ppc/Makefile.in",
 233     "sim/ppc/emul_chirp.c", "sim/ppc/hw_nvram.c", "sim/ppc/dc-test.01",
 234     "sim/ppc/hw_phb.c", "sim/ppc/hw_eeprom.c", "sim/ppc/bits.h",
 235     "sim/ppc/hw_vm.c", "sim/ppc/cap.h", "sim/ppc/os_emul.h",
 236     "sim/ppc/options.h", "sim/ppc/gen-idecode.c", "sim/ppc/filter.c",
 237     "sim/ppc/corefile-n.h", "sim/ppc/std-config.h", "sim/ppc/ld-decode.h",
 238     "sim/ppc/filter_filename.h", "sim/ppc/hw_shm.c",
 239     "sim/ppc/pk_disklabel.c", "sim/ppc/dc-simple", "sim/ppc/misc.h",
 240     "sim/ppc/device_table.h", "sim/ppc/ld-insn.c", "sim/ppc/inline.c",
 241     "sim/ppc/emul_bugapi.h", "sim/ppc/hw_cpu.h", "sim/ppc/debug.h",
 242     "sim/ppc/hw_ide.c", "sim/ppc/debug.c", "sim/ppc/gen-itable.h",
 243     "sim/ppc/interrupts.c", "sim/ppc/hw_glue.c", "sim/ppc/emul_unix.c",
 244     "sim/ppc/sim_calls.c", "sim/ppc/dc-complex", "sim/ppc/ld-cache.c",
 245     "sim/ppc/registers.h", "sim/ppc/dc-test.02", "sim/ppc/options.c",
 246     "sim/ppc/igen.h", "sim/ppc/registers.c", "sim/ppc/device.h",
 247     "sim/ppc/emul_chirp.h", "sim/ppc/hw_register.c", "sim/ppc/hw_init.c",
 248     "sim/ppc/sim-endian-n.h", "sim/ppc/filter_filename.c",
 249     "sim/ppc/bits.c", "sim/ppc/idecode_fields.h", "sim/ppc/hw_memory.c",
 250     "sim/ppc/misc.c", "sim/ppc/double.c", "sim/ppc/psim.h",
 251     "sim/ppc/hw_trace.c", "sim/ppc/emul_netbsd.h", "sim/ppc/psim.c",
 252     "sim/ppc/ppc-instructions", "sim/ppc/tree.h", "sim/ppc/README",
 253     "sim/ppc/gen-icache.h", "sim/ppc/gen-model.h", "sim/ppc/ld-cache.h",
 254     "sim/ppc/mon.c", "sim/ppc/corefile.h", "sim/ppc/vm.c",
 255     "sim/ppc/INSTALL", "sim/ppc/gen-model.c", "sim/ppc/hw_cpu.c",
 256     "sim/ppc/corefile.c", "sim/ppc/hw_opic.c", "sim/ppc/gen-icache.c",
 257     "sim/ppc/events.h", "sim/ppc/os_emul.c", "sim/ppc/emul_generic.c",
 258     "sim/ppc/main.c", "sim/ppc/hw_com.c", "sim/ppc/gen-semantics.c",
 259     "sim/ppc/emul_bugapi.c", "sim/ppc/device.c", "sim/ppc/emul_generic.h",
 260     "sim/ppc/tree.c", "sim/ppc/mon.h", "sim/ppc/interrupts.h",
 261     "sim/ppc/cap.c", "sim/ppc/cpu.c", "sim/ppc/hw_phb.h",
 262     "sim/ppc/device_table.c", "sim/ppc/lf.c", "sim/ppc/lf.c",
 263     "sim/ppc/dc-stupid", "sim/ppc/hw_pal.c", "sim/ppc/ppc-spr-table",
 264     "sim/ppc/emul_unix.h", "sim/ppc/words.h", "sim/ppc/basics.h",
 265     "sim/ppc/hw_htab.c", "sim/ppc/lf.h", "sim/ppc/ld-decode.c",
 266     "sim/ppc/sim-endian.c", "sim/ppc/gen-itable.c",
 267     "sim/ppc/idecode_expression.h", "sim/ppc/table.h", "sim/ppc/dgen.c",
 268     "sim/ppc/events.c", "sim/ppc/gen-idecode.h", "sim/ppc/emul_netbsd.c",
 269     "sim/ppc/igen.c", "sim/ppc/vm_n.h", "sim/ppc/vm.h",
 270     "sim/ppc/hw_iobus.c", "sim/ppc/inline.h",
 271     "sim/testsuite/sim/bfin/s21.s", "sim/testsuite/sim/mips/mips32-dsp2.s",
 272 )
 273
 274 if __name__ == "__main__":
 275     main()
 276