commands: add `spack license update-copyright-year`

This adds a new subcommand to `spack license` that automatically updates
the copyright year in files that should have a license header.

- [x] add `spack license update-copyright-year` command
- [x] add test

2 files changed, 58 insertions, 17 deletions

diff --git a/lib/spack/spack/cmd/license.py b/lib/spack/spack/cmd/license.py
index 84a4a02282..ed57fccc6c 100644
--- a/lib/spack/spack/cmd/license.py
+++ b/lib/spack/spack/cmd/license.py
@@ -9,6 +9,7 @@ import os
 import re
 from collections import defaultdict
 
+import llnl.util.filesystem as fs
 import llnl.util.tty as tty
 
 import spack.paths
@@ -77,15 +78,15 @@ def _all_spack_files(root=spack.paths.prefix):
                 visited.add(path)
 
 
-def _licensed_files(root=spack.paths.prefix):
-    for relpath in _all_spack_files(root):
+def _licensed_files(args):
+    for relpath in _all_spack_files(args.root):
         if any(regex.match(relpath) for regex in licensed_files):
             yield relpath
 
 
 def list_files(args):
     """list files in spack that should have license headers"""
-    for relpath in sorted(_licensed_files()):
+    for relpath in sorted(_licensed_files(args)):
         print(os.path.join(spack.paths.spack_root, relpath))
 
 
@@ -93,6 +94,8 @@ def list_files(args):
 # bool(value) evaluates to True
 OLD_LICENSE, SPDX_MISMATCH, GENERAL_MISMATCH = range(1, 4)
 
+strict_date = r'Copyright 2013-2021'
+
 
 class LicenseError(object):
     def __init__(self):
@@ -118,17 +121,15 @@ class LicenseError(object):
 
 def _check_license(lines, path):
     license_lines = [
-        r'Copyright 2013-(?:201[789]|202\d) Lawrence Livermore National Security, LLC and other',  # noqa: E501
+        r'Copyright 2013-(?:202[01]) Lawrence Livermore National Security, LLC and other',  # noqa: E501
         r'Spack Project Developers\. See the top-level COPYRIGHT file for details.',  # noqa: E501
         r'SPDX-License-Identifier: \(Apache-2\.0 OR MIT\)'
     ]
 
-    strict_date = r'Copyright 2013-2020'
-
     found = []
 
     for line in lines:
-        line = re.sub(r'^[\s#\.]*', '', line)
+        line = re.sub(r'^[\s#\%\.]*', '', line)
         line = line.rstrip()
         for i, license_line in enumerate(license_lines):
             if re.match(license_line, line):
@@ -175,7 +176,7 @@ def verify(args):
 
     license_errors = LicenseError()
 
-    for relpath in _licensed_files(args.root):
+    for relpath in _licensed_files(args):
         path = os.path.join(args.root, relpath)
         with open(path) as f:
             lines = [line for line in f][:license_lines]
@@ -190,15 +191,28 @@ def verify(args):
         tty.msg('No license issues found.')
 
 
-def setup_parser(subparser):
-    sp = subparser.add_subparsers(metavar='SUBCOMMAND', dest='license_command')
-    sp.add_parser('list-files', help=list_files.__doc__)
+def update_copyright_year(args):
+    """update copyright for the current year in all licensed files"""
+
+    llns_and_other = ' Lawrence Livermore National Security, LLC and other'
+    for filename in _licensed_files(args):
+        fs.filter_file(
+            r'Copyright \d{4}-\d{4}' + llns_and_other,
+            strict_date + llns_and_other,
+            os.path.join(args.root, filename)
+        )
 
-    verify_parser = sp.add_parser('verify', help=verify.__doc__)
-    verify_parser.add_argument(
+
+def setup_parser(subparser):
+    subparser.add_argument(
         '--root', action='store', default=spack.paths.prefix,
         help='scan a different prefix for license issues')
 
+    sp = subparser.add_subparsers(metavar='SUBCOMMAND', dest='license_command')
+    sp.add_parser('list-files', help=list_files.__doc__)
+    sp.add_parser('verify', help=verify.__doc__)
+    sp.add_parser('update-copyright-year', help=update_copyright_year.__doc__)
+
 
 def license(parser, args):
     if not git:
@@ -209,5 +223,6 @@ def license(parser, args):
     commands = {
         'list-files': list_files,
         'verify': verify,
+        'update-copyright-year': update_copyright_year,
     }
     return commands[args.license_command](args)
diff --git a/lib/spack/spack/test/cmd/license.py b/lib/spack/spack/test/cmd/license.py
index 614d093c5f..6063a8d9a8 100644
--- a/lib/spack/spack/test/cmd/license.py
+++ b/lib/spack/spack/test/cmd/license.py
@@ -1,4 +1,4 @@
-# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
@@ -8,6 +8,7 @@ import re
 
 from llnl.util.filesystem import touch, mkdirp
 
+import spack.cmd.license
 import spack.paths
 from spack.main import SpackCommand
 
@@ -31,7 +32,7 @@ def test_verify(tmpdir):
     lgpl_header = source_dir.join('lgpl_header.py')
     with lgpl_header.open('w') as f:
         f.write("""\
-# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: LGPL-2.1-only
@@ -48,13 +49,13 @@ def test_verify(tmpdir):
     correct_header = source_dir.join('correct_header.py')
     with correct_header.open('w') as f:
         f.write("""\
-# Copyright 2013-2020 Lawrence Livermore National Security, LLC and other
+# Copyright 2013-2021 Lawrence Livermore National Security, LLC and other
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 """)
 
-    out = license('verify', '--root', str(tmpdir), fail_on_error=False)
+    out = license('--root', str(tmpdir), 'verify', fail_on_error=False)
 
     assert str(no_header) in out
     assert str(lgpl_header) in out
@@ -66,3 +67,28 @@ def test_verify(tmpdir):
     assert re.search(r'files with old license header:\s*1', out)
 
     assert license.returncode == 1
+
+
+def test_update_copyright_year(tmpdir):
+    source_dir = tmpdir.join('lib', 'spack', 'spack')
+    mkdirp(str(source_dir))
+
+    years = list(range(2018, 2021))
+
+    for year in years:
+        outdated = source_dir.join('header_%d.py' % year)
+        with outdated.open('w') as f:
+            f.write("""\
+# Copyright 2013-%d Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+""" % year)
+
+    license('--root', str(tmpdir), 'update-copyright-year')
+
+    for year in years:
+        outdated = source_dir.join('header_%d.py' % year)
+        first_line = outdated.open().read().split("\n")[0]
+        assert str(year) not in first_line
+        assert spack.cmd.license.strict_date in first_line