gdb: fix bugs in gdb/copyright.py, make it use glob patterns

gdb/copyright.py currently changes some files that it shouldn't:

 - despite having a `gnulib/import` entry in EXCLUDE_LIST, it does
   change the files under that directory
 - it is missing `sim/Makefile.in`

Change the exclude list logic to use glob patterns.  This makes it
easier to specify exclusions of full directories or files by basename,
while simplifying the code.

Merge EXCLUDE_LIST and NOT_FSF_LIST, since there's no fundamental reason
to keep them separate (they are treated identically).  I kept the
comment that explains that some files are excluded due to not being
FSF-licensed.

Merge EXCLUDE_ALL_LIST in EXCLUDE_LIST, converting the entries to glob
patterns that match everywhere in the tree (e.g. `**/configure`).

Tested by running the script on the parent commit of d01e823438
("Update copyright dates to include 2025") and diff'ing the result with
d01e823438.  The only differences are:

 - the files that we don't want to modify (gnulib/import and
   sim/Makefile.in)
 - the files that need to be modified by hand

Running the script on latest master produces no diff.

Change-Id: I318dc3bff34e4b3a9b66ea305d0c3872f69cd072
Reviewed-By: Guinevere Larsen <guinevere@redhat.com>

gdb/copyright.py

@@ -36,6 +36,7 @@ import argparse
 import locale
 import os
 import os.path
+import pathlib
 import subprocess
 import sys
 from typing import Iterable
@@ -68,19 +69,15 @@ def get_update_list():
         .split("\0")
     )
 
+    full_exclude_list = EXCLUDE_LIST + BY_HAND
+
     def include_file(filename: str):
-        (dirname, basename) = os.path.split(filename)
-        dirbasename = os.path.basename(dirname)
-        return not (
-            basename in EXCLUDE_ALL_LIST
-            or dirbasename in EXCLUDE_ALL_LIST
-            or dirname in EXCLUDE_LIST
-            or dirname in NOT_FSF_LIST
-            or dirname in BY_HAND
-            or filename in EXCLUDE_LIST
-            or filename in NOT_FSF_LIST
-            or filename in BY_HAND
-        )
+        path = pathlib.Path(filename)
+        for pattern in full_exclude_list:
+            if path.full_match(pattern):
+                return False
+
+        return True
 
     return filter(include_file, result)
 
@@ -212,8 +209,14 @@ def main(argv: list[str]) -> int | None:
 # generated, non-FSF, or otherwise special (e.g. license text,
 # or test cases which must be sensitive to line numbering).
 #
-# Filenames are relative to the root directory.
+# Entries are treated as glob patterns.
 EXCLUDE_LIST = (
+    "**/aclocal.m4",
+    "**/configure",
+    "**/COPYING.LIB",
+    "**/COPYING",
+    "**/fdl.texi",
+    "**/gpl.texi",
     "gdb/copying.c",
     "gdb/nat/glibc_thread_db.h",
     "gdb/CONTRIBUTE",
@@ -221,45 +224,11 @@ EXCLUDE_LIST = (
     "gdbsupport/unordered_dense.h",
     "gnulib/doc/gendocs_template",
     "gnulib/doc/gendocs_template_min",
-    "gnulib/import",
+    "gnulib/import/**",
     "gnulib/config.in",
     "gnulib/Makefile.in",
-)
-
-# Files which should not be modified, either because they are
-# generated, non-FSF, or otherwise special (e.g. license text,
-# or test cases which must be sensitive to line numbering).
-#
-# Matches any file or directory name anywhere.  Use with caution.
-# This is mostly for files that can be found in multiple directories.
-# Eg: We want all files named COPYING to be left untouched.
-
-EXCLUDE_ALL_LIST = (
-    "COPYING",
-    "COPYING.LIB",
-    "configure",
-    "fdl.texi",
-    "gpl.texi",
-    "aclocal.m4",
-)
-
-# The list of files to update by hand.
-BY_HAND: tuple[str, ...] = (
-    # Nothing at the moment :-).
-)
-
-# Files containing multiple copyright headers.  This script is only
-# fixing the first one it finds, so we need to finish the update
-# by hand.
-MULTIPLE_COPYRIGHT_HEADERS = (
-    "gdb/doc/gdb.texinfo",
-    "gdb/doc/refcard.tex",
-    "gdb/syscalls/update-netbsd.sh",
-)
-
-# The list of file which have a copyright, but not held by the FSF.
-# Filenames are relative to the root directory.
-NOT_FSF_LIST = (
+    "sim/Makefile.in",
+    # The files below have a copyright, but not held by the FSF.
     "gdb/exc_request.defs",
     "gdb/gdbtk",
     "gdb/testsuite/gdb.gdbtk/",
@@ -296,9 +265,27 @@ NOT_FSF_LIST = (
     "sim/mips/sim-main.c",
     "sim/moxie/moxie-gdb.dts",
     # Not a single file in sim/ppc/ appears to be copyright FSF :-(.
-    "sim/ppc",
+    "sim/ppc/**",
     "sim/testsuite/mips/mips32-dsp2.s",
 )
 
+# The list of files to update by hand.
+#
+# Entries are treated as glob patterns.
+BY_HAND: tuple[str, ...] = (
+    # Nothing at the moment :-).
+)
+
+# Files containing multiple copyright headers.  This script is only
+# fixing the first one it finds, so we need to finish the update
+# by hand.
+#
+# Entries are treated as glob patterns.
+MULTIPLE_COPYRIGHT_HEADERS = (
+    "gdb/doc/gdb.texinfo",
+    "gdb/doc/refcard.tex",
+    "gdb/syscalls/update-netbsd.sh",
+)
+
 if __name__ == "__main__":
     sys.exit(main(sys.argv[1:]))