[copyright][license] Switch to yearless copyright and some cleanup in the linux-kernel files

* Switch to yearless copyright per FB policy
* Fix up SPDX-License-Identifier lines in `contrib/linux-kernel` sources
* Add zstd copyright/license header to the `contrib/linux-kernel` sources
* Update the `tests/test-license.py` to check for yearless copyright
* Improvements to `tests/test-license.py`
* Check `contrib/linux-kernel` in `tests/test-license.py`

tests/DEPRECATED-test-zstd-speed.py

@@ -2,7 +2,7 @@
 # THIS BENCHMARK IS BEING REPLACED BY automated-bencmarking.py
 
 # ################################################################
-# Copyright (c) 2016-2021, Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
+# Copyright (c) Przemyslaw Skibinski, Yann Collet, Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/Makefile

@@ -1,5 +1,5 @@
 # ################################################################
-# Copyright (c) 2015-2021, Yann Collet, Facebook, Inc.
+# Copyright (c) Yann Collet, Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/automated_benchmarking.py

@@ -1,5 +1,5 @@
 # ################################################################
-# Copyright (c) 2021-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/bigdict.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/checkTag.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/datagencli.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/decodecorpus.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fullbench.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/Makefile

@@ -1,5 +1,5 @@
 # ################################################################
-# Copyright (c) 2016-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/fuzz/block_decompress.c

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/block_round_trip.c

@@ -1,5 +1,5 @@
 /**
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/decompress_dstSize_tooSmall.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/dictionary_decompress.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/dictionary_loader.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/dictionary_round_trip.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/dictionary_stream_round_trip.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fse_read_ncount.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fuzz.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fuzz.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 
 # ################################################################
-# Copyright (c) 2016-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fuzz_data_producer.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fuzz_data_producer.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fuzz_helpers.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/fuzz_helpers.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/raw_dictionary_round_trip.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/regression_driver.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/sequence_compression_api.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/simple_compress.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/simple_decompress.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/simple_round_trip.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/stream_decompress.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/stream_round_trip.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/zstd_frame_info.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/zstd_helpers.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzz/zstd_helpers.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/fuzzer.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/gzip/Makefile

@@ -1,5 +1,5 @@
 # ################################################################
-# Copyright (c) 2017-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/invalidDictionaries.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/legacy.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/longmatch.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/paramgrill.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/poolTests.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/rateLimiter.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 # ################################################################
-# Copyright (c) 2018-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/regression/Makefile

@@ -1,5 +1,5 @@
 # ################################################################
-# Copyright (c) 2015-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/regression/config.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/config.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/data.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/data.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/levels.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/method.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/method.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/result.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/result.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/regression/test.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/roundTripCrash.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/seqgen.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/seqgen.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2021, Facebook, Inc.
+ * Copyright (c) Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/test-license.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 
 # ################################################################
-# Copyright (c) 2016-2021, Facebook, Inc.
+# Copyright (c) Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the
@@ -10,16 +10,12 @@
 # You may select, at your option, one of the above-listed licenses.
 # ################################################################
 
-import datetime
 import enum
 import glob
 import os
+import re
 import sys
 
-YEAR = datetime.datetime.now().year
-
-YEAR_STR = str(YEAR)
-
 ROOT = os.path.join(os.path.dirname(__file__), "..")
 
 RELDIRS = [
@@ -28,22 +24,26 @@ RELDIRS = [
     "lib",
     "programs",
     "tests",
+    "contrib/linux-kernel",
 ]
 
-DIRS = [os.path.join(ROOT, d) for d in RELDIRS]
+REL_EXCLUDES = [
+    "contrib/linux-kernel/test/include",
+]
 
-class File(enum.Enum):
-    C = 1
-    H = 2
-    MAKE = 3
-    PY = 4
+def to_abs(d):
+    return os.path.normpath(os.path.join(ROOT, d)) + "/"
 
-SUFFIX = {
-    File.C: ".c",
-    File.H: ".h",
-    File.MAKE: "Makefile",
-    File.PY: ".py",
-}
+DIRS = [to_abs(d) for d in RELDIRS]
+EXCLUDES = [to_abs(d) for d in REL_EXCLUDES]
+
+SUFFIXES = [
+    ".c",
+    ".h",
+    "Makefile",
+    ".mk",
+    ".py",
+]
 
 # License should certainly be in the first 10 KB.
 MAX_BYTES = 10000
@@ -69,10 +69,13 @@ LICENSE_EXCEPTIONS = {
     # From divsufsort
     "divsufsort.c",
     "divsufsort.h",
+    # License is slightly different because it references GitHub
+    "linux_zstd.h",
 }
 
 
 def valid_copyright(lines):
+    YEAR_REGEX = re.compile("\d\d\d\d|present")
     for line in lines:
         line = line.strip()
         if "Copyright" not in line:
@@ -81,8 +84,9 @@ def valid_copyright(lines):
             return (False, f"Copyright line '{line}' contains 'present'!")
         if "Facebook, Inc" not in line:
             return (False, f"Copyright line '{line}' does not contain 'Facebook, Inc'")
-        if YEAR_STR not in line:
-            return (False, f"Copyright line '{line}' does not contain {YEAR}")
+        year = YEAR_REGEX.search(line)
+        if year is not None:
+            return (False, f"Copyright line '{line}' contains {year.group(0)}; it should be yearless")
         if " (c) " not in line:
             return (False, f"Copyright line '{line}' does not contain ' (c) '!")
         return (True, "")
@@ -107,35 +111,45 @@ def valid_file(filename):
     with open(filename, "r") as f:
         lines = f.readlines(MAX_BYTES)
     lines = lines[:min(len(lines), MAX_LINES)]
-                
+
     ok = True
     if os.path.basename(filename) not in COPYRIGHT_EXCEPTIONS:
         c_ok, c_msg = valid_copyright(lines)
         if not c_ok:
-            print(f"{filename}: {c_msg}")
+            print(f"{filename}: {c_msg}", file=sys.stderr)
             ok = False
     if os.path.basename(filename) not in LICENSE_EXCEPTIONS:
         l_ok, l_msg = valid_license(lines)
         if not l_ok:
-            print(f"{filename}: {l_msg}")
+            print(f"{filename}: {l_msg}", file=sys.stderr)
             ok = False
     return ok
 
 
+def exclude(filename):
+    for x in EXCLUDES:
+        if filename.startswith(x):
+            return True
+    return False
+
 def main():
     invalid_files = []
     for directory in DIRS:
-        for suffix in SUFFIX.values():
-            files = set(glob.glob(f"{directory}/*{suffix}"))
-            files |= set(glob.glob(f"{directory}/**/*{suffix}"))
+        for suffix in SUFFIXES:
+            files = set(glob.glob(f"{directory}/**/*{suffix}", recursive=True))
             for filename in files:
+                if exclude(filename):
+                    continue
                 if not valid_file(filename):
                     invalid_files.append(filename)
     if len(invalid_files) > 0:
-        print(f"Invalid files: {invalid_files}")
+        print("Fail!", file=sys.stderr)
+        for f in invalid_files:
+            print(f)
+        return 1
     else:
-        print("Pass!")
-    return len(invalid_files)
+        print("Pass!", file=sys.stderr)
+        return 0
 
 if __name__ == "__main__":
     sys.exit(main())

tests/test-zstd-versions.py

@@ -2,7 +2,7 @@
 """Test zstd interoperability between versions"""
 
 # ################################################################
-# Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+# Copyright (c) Yann Collet, Facebook, Inc.
 # All rights reserved.
 #
 # This source code is licensed under both the BSD-style license (found in the

tests/zbufftest.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the

tests/zstreamtest.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2021, Yann Collet, Facebook, Inc.
+ * Copyright (c) Yann Collet, Facebook, Inc.
  * All rights reserved.
  *
  * This source code is licensed under both the BSD-style license (found in the