reuse

reuse is a tool for compliance with the REUSE recommendations.

• Documentation: https://reuse.readthedocs.io and https://reuse.software
• Source code: https://github.com/fsfe/reuse-tool
• PyPI: https://pypi-hypernode.com/pypi/fsfe-reuse
• REUSE: 3.0
• Python: 3.6+

Background

Copyright and licensing is difficult, especially when reusing software from different projects that are released under various different licenses. REUSE was started by the Free Software Foundation Europe (FSFE) to provide a set of recommendations to make licensing your Free Software projects easier. Not only do these recommendations make it easier for you to declare the licenses under which your works are released, but they also make it easier for a computer to understand how your project is licensed.

As a short summary, the recommendations are threefold:

1. Choose and provide licenses
2. Add copyright and licensing information to each file
3. Confirm REUSE compliance

You are recommended to read our tutorial for a step-by-step guide through these three steps. The FAQ covers basic questions about licensing, copyright, and more complex use cases. Advanced users and integrators will find the full specification helpful.

This tool exists to facilitate the developer in complying with the above recommendations.

There are other tools that have a lot more features and functionality surrounding the analysis and inspection of copyright and licenses in software projects. The REUSE helper tool, on the other hand, is solely designed to be a simple tool to assist in compliance with the REUSE recommendations.

Install

Installation via pip

To install reuse, you need to have the following pieces of software on your computer:

• Python 3.6+
• pip

You then only need to run the following command:

pip3 install --user fsfe-reuse

After this, make sure that ~/.local/bin is in your $PATH.

Installation via package managers

There are packages available for easy install on some operating systems. You are welcome to help us package this tool for more distributions!

• Arch Linux (AUR): reuse
• Fedora: reuse
• openSUSE: reuse
• GNU Guix: reuse
• NixOS: reuse

Installation from source

You can also install this tool from the source code, but we recommend the methods above for easier and more stable updates. Please make sure the requirements for the installation via pip are present on your machine.

python3 setup.py install

Usage

First, read the REUSE tutorial. In a nutshell:

1. Put your licenses in the LICENSES/ directory.
2. Add a comment header to each file that says SPDX-License-Identifier: GPL-3.0-or-later, and SPDX-FileCopyrightText: $YEAR $NAME. You can be flexible with the format, just make sure that the line starts with SPDX-FileCopyrightText:.
3. Verify your work using this tool.

To check against the recommendations, use reuse lint:

~/Projects/reuse-tool $ reuse lint
[...]

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

This tool can do various more things, detailed in the documentation. Here a short summary:

• addheader --- Add copyright and/or licensing information to the header of a file.

• download --- Download the specified license into the LICENSES/ directory.

• init --- Set up the project for REUSE compliance.

• lint --- Verify the project for REUSE compliance.

• spdx --- Generate an SPDX Document of all files in the project.

Run in Docker

REUSE is simple to include in CI/CD processes. This way, you can check for REUSE compliance for each build. In our resources for developers you can learn how to integrate the REUSE tool in Drone, Travis, or GitLab CI.

Within the fsfe/reuse Docker image available on Docker Hub, you can run the helper tool simply by executing reuse lint. To use the tool on your computer, you can mount your project directory and run reuse lint <path/to/directory>.

Maintainers

• Carmen Bianca Bakker - carmenbianca@fsfe.org

Contribute

Any pull requests or suggestions are welcome at https://github.com/fsfe/reuse-tool or via e-mail to one of the maintainers. General inquiries can be sent to reuse@lists.fsfe.org.

Starting local development is very simple, just execute the following commands:

git clone git@github.com:fsfe/reuse-tool.git
cd reuse-tool/
python3 -mvenv venv
source venv/bin/activate
make develop

You need to run make develop at least once to set up the virtualenv.

Next, run make help to see the available interactions.

License

Copyright (C) 2017-2019 Free Software Foundation Europe e.V.

This work is licensed under multiple licences. Because keeping this section up-to-date is challenging, here is a brief summary as of July 2019:

• All original source code is licensed under GPL-3.0-or-later.
• All documentation is licensed under CC-BY-SA-4.0.
• Some configuration and data files are licensed under CC0-1.0.
• Some code borrowed from spdx/tool-python is licensed under Apache-2.0.

For more accurate information, check the individual files.

Change log

This change log follows the Keep a Changelog spec. Every release contains the following sections:

• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

The versions follow semantic versioning.

0.5.2 - 2019-10-27

Added

• python3 -m reuse now works.

Changed

• Updated license list to 3.6-2-g2a14810.

Fixed

• Performance of reuse lint improved by at least a factor of 2. It no longer does any checksums on files behind the scenes.

• Also handle MachineReadableFormatError when parsing DEP5 files. Tries to import that error. If the import is unsuccessful, it is handled.

0.5.1 - 2019-10-24 [YANKED]

This release was replaced by 0.5.2 due to importing MachineReadableFormatError, which is not a backwards-compatible change.

0.5.0 - 2019-08-29

Added

• TeX and ML comment styles added.

• Added --year and --exclude-year to reuse addheader.

• Added --template to reuse addheader.

• Added --explicit-license to reuse addheader.

• binaryornot added as new dependency.

• Greatly improved the usage documentation.

Changed

• reuse addheader now automatically adds the current year to the copyright notice.

• reuse addheader preserves the original header below the new header if it did not contain any SPDX information.

• reuse addheader now correctly handles .license files.

• Bad licenses are no longer resolved to LicenseRef-Unknown. They are instead resolved to the stem of the path. This reduces the magic in the code base.

• .gitkeep files are now ignored by the tool.

• Changed Lisp's comment character from ';;' to ';'.

0.4.1 - 2019-08-07

Added

• --all argument help to reuse download, which downloads all detected missing licenses.

Fixed

• When using reuse addheader on a file that contains a shebang, the shebang is preserved.

• Copyright lines in reuse spdx are now sorted.

• Some publicly visible TODOs were patched away.

0.4.0 - 2019-08-07

This release is a major overhaul and refactoring of the tool. Its primary focus is improved usability and speed, as well as adhering to version 3.0 of the REUSE Specification.

Added

• reuse addheader has been added as a way to automatically add copyright statements and license identifiers to the headers of files. It is currently not complete.

• reuse init has been added as a way to initialise a REUSE project. Its functionality is currently scarce, but should improve in the future.

Changed

• reuse lint now provides a helpful summary instead of merely spitting out non-compliant files.

• reuse compile is now reuse spdx.

• In addition to Copyright and ©, copyright lines can be marked with the tag SPDX-FileCopyrightText:. This is the new recommended default.

• Project no longer depends on pygit2.

• The list of SPDX licenses has been updated.

• Valid-License-Identifier is no longer used, and licenses and exceptions can now only live inside of the LICENSES/ directory.

Removed

• Removed --ignore-debian.

• Removed --spdx-mandatory, --copyright-mandatory, --ignore-missing arguments from reuse lint.

• Remove reuse license.

• GPL-3.0 and GPL-3.0+ (and all other similar GPL licenses) are no longer detected as SPDX identifiers. Use GPL-3.0-only and GPL-3.0-or-later instead.

Fixed

• Scanning a Git directory is a lot faster now.

• Scanning binary files is a lot faster now.

0.3.4 - 2019-04-15

This release should be a short-lived one. A new (slightly backwards-incompatible) version is in the works.

Added

• Copyrights can now start with © in addition to Copyright. The former is now recommended, but they are functionally similar.

Changed

• The source code of reuse is now formatted with black.
• The repository has been moved from https://git.fsfe.org/reuse/reuse to https://gitlab.com/reuse/reuse.

0.3.3 - 2018-07-15

Fixed

• Any files with the suffix .spdx are no longer considered licenses.

0.3.2 - 2018-07-15

Fixed

• The documentation now builds under Python 3.7.

0.3.1 - 2018-07-14

Fixed

• When using reuse from a child directory using pygit2, correctly find the root.

0.3.0 - 2018-05-16

Changed

• The output of reuse compile is now deterministic. The files, copyright lines and SPDX expressions are sorted alphabetically.

Fixed

• When a GPL license could not be found, the correct -only or -or-later extension is now used in the warning message, rather than a bare GPL-3.0.
• If you have a license listed as SPDX-Valid-License: GPL-3.0-or-later, this now correctly matches corresponding SPDX identifiers. Still it is recommended to use SPDX-Valid-License: GPL-3.0 instead.

0.2.0 - 2018-04-17

Added

• Internationalisation support added. Initial support for:
  • English.
  • Dutch.
  • Esperanto.
  • Spanish.

Fixed

• The license list of SPDX 3.0 has deprecated GPL-3.0 and GPL-3.0+ et al in favour of GPL-3.0-only and GPL-3.0-or-later. The program has been amended to accommodate sufficiently for those licenses.

Changed

• Project.reuse_info_of now extracts, combines and returns information both from the file itself and from debian/copyright.
• ReuseInfo now holds sets instead of lists.
  • As a result of this, ReuseInfo will not hold duplicates of copyright lines or SPDX expressions.
• click removed as dependency. Good old argparse from the library is used instead.

0.1.1 - 2017-12-14

Changed

• The reuse --help text has been tidied up a little bit.

Fixed

• Release date in change log fixed.
• The PyPI homepage now gets reStructuredText instead of Markdown.

0.1.0 - 2017-12-14

Added

• Successfully parse old-style C and HTML comments now.
• Added reuse compile, which creates an SPDX bill of materials.
• Added --ignore-missing to reuse lint.
• Allow to specify multiple paths to reuse lint.
• chardet added as dependency.
• pygit2 added as soft dependency. reuse remains usable without it, but the performance with pygit2 is significantly better. Because pygit2 has a non-Python dependency (libgit2), it must be installed independently by the user. In the future, when reuse is packaged natively, this will not be an issue.

Changed

• Updated to version 2.0 of the REUSE recommendations. The most important change is that License-Filename is no longer used. Instead, the filename is deducted from SPDX-License-Identifier. This change is NOT backwards compatible.
• The conditions for linting have changed. A file is now non-compliant when:
  • The license associated with the file could not be found.
  • There is no SPDX expression associated with the file.
  • There is no copyright notice associated with the file.
• Only read the first 4 KiB (by default) from code files rather than the entire file when searching for SPDX tags. This speeds up the tool a bit.
• Project.reuse_info_of no longer raises an exception. Instead, it returns an empty ReuseInfo object when no reuse information is found.
• Logging is a lot prettier now. Only output entries from the reuse module.

Fixed

• reuse --ignore-debian compile now works as expected.
• The tool no longer breaks when reading a file that has a non-UTF-8 encoding. Instead, chardet is used to detect the encoding before reading the file. If a file still has errors during decoding, those errors are silently ignored and replaced.

0.0.4 - 2017-11-06

Fixed

• Removed dependency on os.PathLike so that Python 3.5 is actually supported

0.0.3 - 2017-11-06

Fixed

• Fixed the link to PyPI in the README.

0.0.2 - 2017-11-03

This is a very early development release aimed at distributing the program as soon as possible. Because this is the first release, the changelog is a little empty beyond "created the program".

The program can do roughly the following:

• Detect the license of a given file through one of three methods (in order of precedence):
  • Information embedded in the .license file.
  • Information embedded in its header.
  • Information from the global debian/copyright file.
• Find and report all files in a project tree of which the license could not be found.
• Ignore files ignored by Git.
• Do some logging into STDERR.