Use SPDX copyright and license headers

The modern way to specify copyright and license is using SPDX[1]
headers. This is nicer for developers and more friendly for programs
that want to extract this info.

This change was created by the ruse tool[2], using this command:

    reuse init
    ...
    reuse addheader \
        --copyright 'The RamenDR authors' \
        --license Apache-2.0 \
        --exclude-year \
        --skip-unrecognised \
        --template ramen \
        `git ls-files`

Few unrecognized files were modified manually.

The copyright excludes the years since this info is not really needed,
and this avoids the work of updating all copyrights every year.

The `LICENSE` file was moved to `LICENSES/Apache-2.0.txt`, so we can
check the project with the reuse tool. LICENSE is now a symbolic link to
`LICENSES/Apache-2.0.txt` to make GitHub and Go tools happy.

Checking the source with the ruse too show that we are not done yet:

    $ reuse lint
    # MISSING COPYRIGHT AND LICENSING INFORMATION

    The following files have no copyright and licensing information:
    * config/crd/bases/ramendr.openshift.io_drclusters.yaml
    * config/crd/bases/ramendr.openshift.io_drplacementcontrols.yaml
    * config/crd/bases/ramendr.openshift.io_drpolicies.yaml
    * config/crd/bases/ramendr.openshift.io_protectedvolumereplicationgrouplists.yaml
    * config/crd/bases/ramendr.openshift.io_volumereplicationgroups.yaml

    # SUMMARY

    * Bad licenses:
    * Deprecated licenses:
    * Licenses without file extension:
    * Missing licenses:
    * Unused licenses:
    * Used licenses: Apache-2.0
    * Read errors: 0
    * Files with copyright information: 233 / 238
    * Files with license information: 233 / 238

    Unfortunately, your project is not compliant with version 3.0 of the REUSE Specification :-(

The files in `config/crd/bases` seems to be generated during the build
without the SPDX headers, and the CI sanity check fail the build. This
will be fixed in a later commit.

[1] https://spdx.dev/
[2] https://reuse.software/

Signed-off-by: Nir Soffer <[email protected]>

.dockerignore

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
 # More info: https://docs.docker.com/engine/reference/builder/#dockerignore-file
 # Ignore all files which are not go type
 !**/*.go

.github/workflows/sanity.yml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
 ---
 # yamllint disable rule:line-length
 

.gitignore

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
 
 # Binaries for programs and plugins
 *.exe

.golangci.yaml

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
 ---
 # yamllint disable rule:line-length
 # Ref template: https://github.com/golangci/golangci-lint/blob/v1.37.1/.golangci.example.yml
@@ -26,19 +29,8 @@ linters-settings:
     min-complexity: 15
   goheader:
     template: |
-      Copyright 2021 The RamenDR 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.
+      SPDX-FileCopyrightText: The RamenDR authors
+      SPDX-License-Identifier: Apache-2.0
   misspell:
     locale: US
   wsl:

.reuse/dep5

@@ -0,0 +1,10 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: Ramen
+Upstream-Contact: The RamenDR authors
+Source: https://github.com/RamenDR/ramen
+
+# Sample paragraph, commented out:
+#
+# Files: src/*
+# Copyright: $YEAR $NAME <$CONTACT>
+# License: ...

.reuse/templates/ramen.jinja2

@@ -0,0 +1,6 @@
+{% for copyright_line in copyright_lines %}
+{{ copyright_line }}
+{% endfor %}
+{% for expression in spdx_expressions %}
+SPDX-License-Identifier: {{ expression }}
+{% endfor %}

CONTRIBUTING.md

@@ -1,9 +1,14 @@
+<!--
+SPDX-FileCopyrightText: The RamenDR authors
+SPDX-License-Identifier: Apache-2.0
+-->
+
 # How to Contribute
 
-The Ramen project in under [Apache 2.0 license](LICENSE). We accept
-contributions via GitHub pull requests. This document outlines some of the
-conventions related to development workflow to make it easier to get your
-contribution accepted.
+The Ramen project in under [Apache 2.0 license](LICENSES/Apache-2.0.txt).
+We accept contributions via GitHub pull requests. This document outlines
+some of the conventions related to development workflow to make it
+easier to get your contribution accepted.
 
 ## Certificate of Origin
 

DCO

@@ -1,3 +1,6 @@
+SPDX-FileCopyrightText: The RamenDR authors
+SPDX-License-Identifier: Apache-2.0
+
 Developer Certificate of Origin
 Version 1.1
 

Dockerfile

@@ -1,3 +1,6 @@
+# SPDX-FileCopyrightText: The RamenDR authors
+# SPDX-License-Identifier: Apache-2.0
+
 # Build the manager binary
 FROM golang:1.18 as builder
 

LICENSE

@@ -0,0 +1 @@
+LICENSES/Apache-2.0.txt