Add license file for R packages from CRAN

[jdblischak]

This PR adds the field license_file for CRAN R packages that use one of the complete licenses shipped with R.

xref: conda-forge/staged-recipes#3234

To demonstrate the new behavior:

$ cd conda-build
$ export PYTHONPATH=.
$ python bin/conda-skeleton cran r-abf2 r-ada r-adapr r-arc r-bigml r-far r-grnn  r-gsa r-udunits2 r-usethis
$ grep license[:_] r-*/meta.yaml
r-abf2/meta.yaml:  license: Artistic-2.0
r-abf2/meta.yaml:  license_family: OTHER
r-abf2/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/Artistic-2.0'  # [unix]
r-abf2/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/Artistic-2.0'  # [win]
r-ada/meta.yaml:  license: GPL
r-ada/meta.yaml:  license_family: GPL
r-ada/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/GPL-3'  # [unix]
r-ada/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/GPL-3'  # [win]
r-adapr/meta.yaml:  license: LGPL-2
r-adapr/meta.yaml:  license_family: LGPL
r-adapr/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/LGPL-2'  # [unix]
r-adapr/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/LGPL-2'  # [win]
r-arc/meta.yaml:  license: AGPL-3
r-arc/meta.yaml:  license_family: AGPL
r-arc/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/AGPL-3'  # [unix]
r-arc/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/AGPL-3'  # [win]
r-bigml/meta.yaml:  license: LGPL-3
r-bigml/meta.yaml:  license_family: LGPL
r-bigml/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/LGPL-3'  # [unix]
r-bigml/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/LGPL-3'  # [win]
r-far/meta.yaml:  license: LGPL-2.1
r-far/meta.yaml:  license_family: LGPL
r-far/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/LGPL-2.1'  # [unix]
r-far/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/LGPL-2.1'  # [win]
r-grnn/meta.yaml:  license: AGPL
r-grnn/meta.yaml:  license_family: AGPL
r-grnn/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/AGPL-3'  # [unix]
r-grnn/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/AGPL-3'  # [win]
r-gsa/meta.yaml:  license: LGPL
r-gsa/meta.yaml:  license_family: LGPL
r-gsa/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/LGPL-3'  # [unix]
r-gsa/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/LGPL-3'  # [win]
r-udunits2/meta.yaml:  license: GPL-2
r-udunits2/meta.yaml:  license_family: GPL2
r-udunits2/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/GPL-2'  # [unix]
r-udunits2/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/GPL-2'  # [win]
r-usethis/meta.yaml:  license: GPL-3
r-usethis/meta.yaml:  license_family: GPL3
r-usethis/meta.yaml:  license_file: '{ environ["PREFIX"] }/lib/R/share/licenses/GPL-3'  # [unix]
r-usethis/meta.yaml:  license_file: '{ environ["PREFIX"] }/R/share/licenses/GPL-3'  # [win]

[msarahan]

Please clean up flake8: https://travis-ci.org/conda/conda-build/jobs/370621211#L1409

CI looks fine otherwise - the fail on travis is unrelated.

[msarahan]

Fixed for you. I wanted to get this in for the release that I am preparing.

[isuruf]

Isn't the path changed in the new anaconda r-base version? cc @mingwandroid

[jdblischak]

Thanks @msarahan!

How soon are you planning on the next release? How to handle the license can be a contentious issue, so I'd prefer to have some time for the community to comment.

[msarahan]

just tagged. Might need to tag 3.9.1 soon, depending on what @mingwandroid has to say about the point that @isuruf raised.

[mingwandroid]

Yeah the path has changed. But I need to make a PR to r-base before you can use that. Will try to do that tonight.

Also we may want to unify on mran snapshots as the default cran mirror here?

[jdblischak]

For my future self, xref: #2835 and conda-forge/r-base-feedstock#43

[github-actions]

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Thanks!