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.

Since we don't have any boilerplate now, we don't need now the
`hack/boilareplate.go.txt`.

The `LICENSE` file was moved to `LICENSES/Apache-2.0.txt`, so we can
check the project with the reuse tool:

    $ reuse lint
    # 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: 237 / 237
    * Files with license information: 237 / 237

    Congratulations! Your project is compliant with version 3.0 of the REUSE Specification :-)

LICENSE is now a symbolic link to `LICENSES/Apache-2.0.txt` to make
GitHub and Go tools happy.

[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

.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

@@ -1,3 +1,8 @@
+<!--
+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

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