🌱 Enforce correct file headers

Makefile

@@ -1,18 +1,16 @@
-#!/usr/bin/env bash
-
-#  Copyright 2020 The Kubernetes Authors.
+# Copyright 2020 The Kubernetes Authors.
 #
-#  Licensed under the Apache License, Version 2.0 (the "License");
-#  you may not use this file except in compliance with the License.
-#  You may obtain a copy of the License at
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
 #
-#      http://www.apache.org/licenses/LICENSE-2.0
+#     http://www.apache.org/licenses/LICENSE-2.0
 #
-#  Unless required by applicable law or agreed to in writing, software
-#  distributed under the License is distributed on an "AS IS" BASIS,
-#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-#  See the License for the specific language governing permissions and
-#  limitations under the License.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 # If you update this file, please follow
 # https://suva.sh/posts/well-documented-makefiles
@@ -146,6 +144,10 @@ verify-modules: modules $(GO_MOD_CHECK) ## Verify go modules are up to date
 
 APIDIFF_OLD_COMMIT ?= $(shell git rev-parse origin/main)
 
+.PHONY: verify-boilerplate
+verify-boilerplate: ## Verify boilerplate text exists in each file
+	./hack/verify-boilerplate.sh
+
 .PHONY: apidiff
 verify-apidiff: $(GO_APIDIFF) ## Check for API differences
 	$(GO_APIDIFF) $(APIDIFF_OLD_COMMIT) --print-compatible

hack/boilerplate/README.md

@@ -0,0 +1,3 @@
+# Boilerplate utilities
+
+The boilerplate validation utilities have been copied and adapted from upstream Kubernetes, see https://github.com/kubernetes/kubernetes/blob/4dfd73940396730caf331e35cbb28235d233f2a0/hack/boilerplate.

hack/boilerplate/boilerplate.Makefile.txt

@@ -0,0 +1,14 @@
+# Copyright YEAR The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+

hack/boilerplate/boilerplate.generatego.txt

@@ -0,0 +1,15 @@
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/

hack/boilerplate/boilerplate.go.txt

@@ -0,0 +1,15 @@
+/*
+Copyright YEAR The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/

hack/boilerplate/boilerplate.py

@@ -0,0 +1,235 @@
+#!/usr/bin/env python3
+
+# Copyright 2015 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import print_function
+
+import argparse
+import datetime
+import difflib
+import glob
+import os
+import re
+import sys
+
+parser = argparse.ArgumentParser()
+parser.add_argument(
+    "filenames",
+    help="list of files to check, all files if unspecified",
+    nargs='*')
+
+rootdir = os.path.dirname(__file__) + "/../../"
+rootdir = os.path.abspath(rootdir)
+parser.add_argument(
+    "--rootdir", default=rootdir, help="root directory to examine")
+
+default_boilerplate_dir = os.path.join(rootdir, "hack/boilerplate")
+parser.add_argument(
+    "--boilerplate-dir", default=default_boilerplate_dir)
+
+parser.add_argument(
+    "-v", "--verbose",
+    help="give verbose output regarding why a file does not pass",
+    action="store_true")
+
+args = parser.parse_args()
+
+verbose_out = sys.stderr if args.verbose else open("/dev/null", "w")
+
+def get_refs():
+    refs = {}
+
+    for path in glob.glob(os.path.join(args.boilerplate_dir, "boilerplate.*.txt")):
+        extension = os.path.basename(path).split(".")[1]
+
+        ref_file = open(path, 'r')
+        ref = ref_file.read().splitlines()
+        ref_file.close()
+        refs[extension] = ref
+
+    return refs
+
+def is_generated_file(filename, data, regexs):
+    for d in skipped_ungenerated_files:
+        if d in filename:
+            return False
+
+    p = regexs["generated"]
+    return p.search(data)
+
+def file_passes(filename, refs, regexs):
+    try:
+        f = open(filename, 'r')
+    except Exception as exc:
+        print("Unable to open %s: %s" % (filename, exc), file=verbose_out)
+        return False
+
+    data = f.read()
+    f.close()
+
+    # determine if the file is automatically generated
+    generated = is_generated_file(filename, data, regexs)
+
+    basename = os.path.basename(filename)
+    extension = file_extension(filename)
+    if generated:
+        if extension == "go":
+            extension = "generatego"
+
+    if extension != "":
+        ref = refs[extension]
+    else:
+        ref = refs[basename]
+
+    # remove extra content from the top of files
+    if extension == "go" or extension == "generatego":
+        p = regexs["go_build_constraints"]
+        (data, found) = p.subn("", data, 1)
+    elif extension in ["sh", "py"]:
+        p = regexs["shebang"]
+        (data, found) = p.subn("", data, 1)
+
+    data = data.splitlines()
+
+    # if our test file is smaller than the reference it surely fails!
+    if len(ref) > len(data):
+        print('File %s smaller than reference (%d < %d)' %
+              (filename, len(data), len(ref)),
+              file=verbose_out)
+        return False
+
+    # trim our file to the same number of lines as the reference file
+    data = data[:len(ref)]
+
+    p = regexs["year"]
+    for d in data:
+        if p.search(d):
+            if generated:
+                print('File %s has the YEAR field, but it should not be in generated file' %
+                      filename, file=verbose_out)
+            else:
+                print('File %s has the YEAR field, but missing the year of date' %
+                      filename, file=verbose_out)
+            return False
+
+    if not generated:
+        # Replace all occurrences of the regex "2014|2015|2016|2017|2018" with "YEAR"
+        p = regexs["date"]
+        for i, d in enumerate(data):
+            (data[i], found) = p.subn('YEAR', d)
+            if found != 0:
+                break
+
+    # if we don't match the reference at this point, fail
+    if ref != data:
+        print("Header in %s does not match reference, diff:" %
+              filename, file=verbose_out)
+        if args.verbose:
+            print(file=verbose_out)
+            for line in difflib.unified_diff(ref, data, 'reference', filename, lineterm=''):
+                print(line, file=verbose_out)
+            print(file=verbose_out)
+
+        return False
+
+    return True
+
+def file_extension(filename):
+    return os.path.splitext(filename)[1].split(".")[-1].lower()
+
+skipped_dirs = ['_output', '.git', "hack/boilerplate/test"]
+
+# list all the files contain 'DO NOT EDIT', but are not generated
+skipped_ungenerated_files = [
+    'hack/lib/swagger.sh',
+    'hack/boilerplate/boilerplate.py',
+    # The generator injects `DO NOT EDIT` and thus needs to get excluded to not
+    # get detected as false positive.
+    'hack/tools/prowjob-gen/generator.go',
+    ]
+
+def normalize_files(files):
+    newfiles = []
+    for pathname in files:
+        if any(x in pathname for x in skipped_dirs):
+            continue
+        newfiles.append(pathname)
+    for i, pathname in enumerate(newfiles):
+        if not os.path.isabs(pathname):
+            newfiles[i] = os.path.join(args.rootdir, pathname)
+    return newfiles
+
+def get_files(extensions):
+    files = []
+    if len(args.filenames) > 0:
+        files = args.filenames
+    else:
+        for root, dirs, walkfiles in os.walk(args.rootdir):
+            # don't visit certain dirs. This is just a performance improvement
+            # as we would prune these later in normalize_files(). But doing it
+            # cuts down the amount of filesystem walking we do and cuts down
+            # the size of the file list
+            for d in skipped_dirs:
+                if d in dirs:
+                    dirs.remove(d)
+
+            for name in walkfiles:
+                pathname = os.path.join(root, name)
+                files.append(pathname)
+
+    files = normalize_files(files)
+    outfiles = []
+    for pathname in files:
+        basename = os.path.basename(pathname)
+        extension = file_extension(pathname)
+        if extension in extensions or basename in extensions:
+            outfiles.append(pathname)
+    return outfiles
+
+def get_dates():
+    years = datetime.datetime.now().year
+    return '(%s)' % '|'.join((str(year) for year in range(2014, years+1)))
+
+def get_regexs():
+    regexs = {}
+    # Search for "YEAR" which exists in the boilerplate, but shouldn't in the real thing
+    regexs["year"] = re.compile('YEAR')
+    # get_dates return 2014, 2015, 2016, 2017, or 2018 until the current year as a regex like: "(2014|2015|2016|2017|2018)";
+    # company holder names can be anything
+    regexs["date"] = re.compile(get_dates())
+    # strip the following build constraints/tags:
+    # //go:build
+    # // +build \n\n
+    regexs["go_build_constraints"] = re.compile(
+        r"^(//(go:build| \+build).*\n)+\n", re.MULTILINE)
+    # strip #!.* from scripts
+    regexs["shebang"] = re.compile(r"^(#!.*\n)\n*", re.MULTILINE)
+    # Search for generated files
+    regexs["generated"] = re.compile('DO NOT EDIT')
+    return regexs
+
+def main():
+    regexs = get_regexs()
+    refs = get_refs()
+    filenames = get_files(refs.keys())
+
+    for filename in filenames:
+        if not file_passes(filename, refs, regexs):
+            print(filename, file=sys.stdout)
+
+    return 0
+
+if __name__ == "__main__":
+    sys.exit(main())

hack/boilerplate/boilerplate.py.txt

@@ -0,0 +1,13 @@
+# Copyright YEAR The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

hack/boilerplate/boilerplate.sh.txt

@@ -0,0 +1,13 @@
+# Copyright YEAR The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.