Add a file defining mapping of SPDX-2.0 license identifiers to Gentoo
ebuild licenses. This was originally discussed on Gentoo Bugzilla [1],
the submitted to the gentoo-dev ml [2].

The proposed file uses the common key-value format used for
configuration files. Currently only `spdx-to-ebuild` section is defined
but other kinds of mapping can be added in the future. As described
in the top comment, it provides the ability to map SPDX-2.0 license
identifiers along with the `+` and `WITH` operators to arbitrary
Gentoo LICENSE strings (including all-of and any-of groups).

The initial list is taken from cargo-ebuild's license.rs [3],
courtesy of Leonardo H. Neumann and Georgy Yakovlev. A parser for this
file format is implemented in pycargoebuild [4].

[1] https://bugs.gentoo.org/706472
[2] https://archives.gentoo.org/gentoo-dev/message/01924bb71411696dce04445d85da508d
[3] https://gitweb.gentoo.org/proj/cargo-ebuild.git/tree/src/license.rs?id=b4314edc5bb672f5e94dcbc996f443e98fdb4dba
[4] https://github.com/projg2/pycargoebuild/

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
metadata/license-mapping.conf | 171 ++++++++++++++++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100644 metadata/license-mapping.conf

diff --git a/metadata/license-mapping.conf b/metadata/license-mapping.conf
new file mode 100644
index 000000000000..c6608e450f4a
--- /dev/null
+++ b/metadata/license-mapping.conf
@@ -0,0 +1,171 @@
+# Copyright 2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+# Mapping of SPDX-2.0 licenses to Gentoo repository licenses.
+#
+# Keys are <license-id>[+] [WITH <exception-id>].
+#
+# License and exception identifiers are case-insensitive but please follow
+# the case used in SPDX. "WITH" exceptions are matched exactly,
+# i.e. "Apache-2.0 WITH LLVM-exception" will not match plain "Apache-2.0".
+# The "+" operator prefers exact match but falls back to the variant without, +# i.e. if "MPL-1.0+" is not defined, the mapping for "MPL-1.0" is used.
+#
+# Values are ebuild-style LICENSE terms, po

On Sun, 13 Nov 2022, Michał Górny wrote:

+CC-PD = CC-PDDC

This one is the wrong way around.

+Fair = fairuse

These are completely different.

+LPPL-1.3a = LPPL-1.3

Different version (SPDX doesn't have 1.3, and we don't have 1.3a).

Looks like all versions of the FDL are missing?

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sun, 2022-11-13 at 15:54 +0100, Ulrich Mueller wrote:

On Sun, 13 Nov 2022, Michał Górny wrote:

+CC-PD = CC-PDDC

This one is the wrong way around.

Good catch, thanks. I've verified the list against SPDX license list
and ::gentoo repo now, and removed "W3C-document" and "GPL-3-with- autoconf-exception" that we (no longer?) have.

+Fair = fairuse

These are completely different.

Removed.

+LPPL-1.3a = LPPL-1.3

Different version (SPDX doesn't have 1.3, and we don't have 1.3a).

Removed.

Looks like all versions of the FDL are missing?

To be honest, I'm wondering whether copying the list from cargo-ebuild
is a good idea after all. Perhaps we should just copy the most common
licenses (i.e. GPLs/BSD/MIT...) that are easy to match, and add other
licenses as we need them (and verify in the process).

I've created a PR to track the current status: https://github.com/gentoo/gentoo/pull/28256

--
Best regards,
Michał Górny

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 13 Nov 2022, at 11:58, Michał Górny <mgorny@gentoo.org> wrote:

Add a file defining mapping of SPDX-2.0 license identifiers to Gentoo
ebuild licenses. This was originally discussed on Gentoo Bugzilla [1],
the submitted to the gentoo-dev ml [2].

The proposed file uses the common key-value format used for
configuration files. Currently only `spdx-to-ebuild` section is defined
but other kinds of mapping can be added in the future. As described
in the top comment, it provides the ability to map SPDX-2.0 license identifiers along with the `+` and `WITH` operators to arbitrary
Gentoo LICENSE strings (including all-of and any-of groups).

The initial list is taken from cargo-ebuild's license.rs [3],
courtesy of Leonardo H. Neumann and Georgy Yakovlev. A parser for this
file format is implemented in pycargoebuild [4].

[1] https://bugs.gentoo.org/706472
[2] https://archives.gentoo.org/gentoo-dev/message/01924bb71411696dce04445d85da508d
[3] https://gitweb.gentoo.org/proj/cargo-ebuild.git/tree/src/license.rs?id=b4314edc5bb672f5e94dcbc996f443e98fdb4dba
[4] https://github.com/projg2/pycargoebuild/

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
metadata/license-mapping.conf | 171 ++++++++++++++++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100644 metadata/license-mapping.conf

I like the idea.

If/when we do this:
- Should this be in a GLEP?
- It needs pkgcheck support for e.g. invalid entries, duplicates.


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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Sun, 2022-11-13 at 17:46 +0000, Sam James wrote:

On 13 Nov 2022, at 11:58, Michał Górny <mgorny@gentoo.org> wrote:

Add a file defining mapping of SPDX-2.0 license identifiers to Gentoo ebuild licenses. This was originally discussed on Gentoo Bugzilla [1],
the submitted to the gentoo-dev ml [2].

The proposed file uses the common key-value format used for
configuration files. Currently only `spdx-to-ebuild` section is defined but other kinds of mapping can be added in the future. As described
in the top comment, it provides the ability to map SPDX-2.0 license identifiers along with the `+` and `WITH` operators to arbitrary
Gentoo LICENSE strings (including all-of and any-of groups).

The initial list is taken from cargo-ebuild's license.rs [3],
courtesy of Leonardo H. Neumann and Georgy Yakovlev. A parser for this file format is implemented in pycargoebuild [4].

[1] https://bugs.gentoo.org/706472
[2] https://archives.gentoo.org/gentoo-dev/message/01924bb71411696dce04445d85da508d
[3] https://gitweb.gentoo.org/proj/cargo-ebuild.git/tree/src/license.rs?id=b4314edc5bb672f5e94dcbc996f443e98fdb4dba
[4] https://github.com/projg2/pycargoebuild/

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
metadata/license-mapping.conf | 171 ++++++++++++++++++++++++++++++++++
1 file changed, 171 insertions(+)
create mode 100644 metadata/license-mapping.conf

I like the idea.

If/when we do this:
- Should this be in a GLEP?

I don't think we need a GLEP, the comment on top should be sufficient to explain how it's supposed to work.

--
Best regards,
Michał Górny

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)