Adding SPDX Authors headers using Apache 2.0.

Signed-off-by: Scott Nichols <snichols@vmware.com>

AUTHORS

@@ -0,0 +1,9 @@
+# This is the list of CloudEvents authors for copyright purposes.
+#
+# This does not necessarily list everyone who has contributed code, since in
+# some cases, their employer may be the copyright holder.  To see the full list
+# of contributors, see the revision history in source control.
+Google LLC
+IBM Corp
+Red Hat, Inc.
+VMware, Inc.

hack/boilerplate/add-boilerplate.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0
+
+USAGE=$(cat <<EOF
+Add boilerplate.<ext>.txt to all .<ext> files missing it in a directory.
+
+Usage: (from repository root)
+       ./hack/boilerplate/add-boilerplate.sh <ext> <DIR>
+
+Example: (from repository root)
+         ./hack/boilerplate/add-boilerplate.sh go cmd
+EOF
+)
+
+set -e
+
+if [[ -z $1 || -z $2 ]]; then
+  echo "${USAGE}"
+  exit 1
+fi
+
+grep --recursive --files-without-match --extended-regexp --regexp="Copyright \d+ The CloudEvents Authors" $2 \
+  | grep --regexp="\.$1\$" \
+  | xargs -I {} sh -c \
+  "cat hack/boilerplate/boilerplate.$1.txt {} > /tmp/boilerplate && mv /tmp/boilerplate {}"

hack/boilerplate/boilerplate.go.txt

@@ -0,0 +1,5 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+

hack/boilerplate/boilerplate.sh.txt

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0

hack/build-test.sh

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0
+
 set -o errexit
 set -o nounset
 

hack/conformance-test.sh

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0
+
 set -o errexit
 set -o nounset
 set -o pipefail

hack/integration-test.sh

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0
+
 set -o errexit
 set -o nounset
 set -o pipefail

hack/tag-release.sh

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0
+
 set -o errexit
 set -o nounset
 set -o pipefail

hack/unit-test.sh

@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+# Copyright 2021 The CloudEvents Authors
+# SPDX-License-Identifier: Apache-2.0
+
 set -o errexit
 set -o nounset
 set -o pipefail

observability/opencensus/v2/client/client.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package client
 
 import (

observability/opencensus/v2/client/client_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package client
 
 import (

observability/opencensus/v2/client/observability_service.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package client
 
 import (

observability/opencensus/v2/client/observable.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package client
 
 import (

observability/opencensus/v2/client/reporter.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package client
 
 import (

observability/opencensus/v2/client/trace_attributes.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package client
 
 import (

observability/opencensus/v2/http/http.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package http
 
 import (

protocol/amqp/v2/doc.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 /*
 Package amqp implements an AMQP binding using pack.ag/amqp module
 */

protocol/amqp/v2/message.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/amqp/v2/message_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/amqp/v2/options.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/amqp/v2/protocol.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/amqp/v2/receiver.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/amqp/v2/sender.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/amqp/v2/types.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import "github.com/cloudevents/sdk-go/v2/types"

protocol/amqp/v2/write_message.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package amqp
 
 import (

protocol/kafka_sarama/v2/doc.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 /*
 Package kafka_sarama implements a Kafka binding using github.com/Shopify/sarama module
 */

protocol/kafka_sarama/v2/message.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/message_benchmark_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama_test
 
 import (

protocol/kafka_sarama/v2/message_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama_test
 
 import (

protocol/kafka_sarama/v2/option.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/protocol.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/receiver.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/sender.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/sender_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/write_producer_message.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/kafka_sarama/v2/write_producer_message_benchmark_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama_test
 
 import (

protocol/kafka_sarama/v2/write_producer_message_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package kafka_sarama
 
 import (

protocol/nats/v2/doc.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 /*
 Package nats implements the CloudEvent transport implementation using NATS.
 */

protocol/nats/v2/message.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package nats
 
 import (

protocol/nats/v2/options.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package nats
 
 import (

protocol/nats/v2/options_test.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package nats
 
 import (

protocol/nats/v2/protocol.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package nats
 
 import (

protocol/nats/v2/receiver.go

@@ -1,3 +1,8 @@
+/*
+ Copyright 2021 The CloudEvents Authors
+ SPDX-License-Identifier: Apache-2.0
+*/
+
 package nats
 
 import (