[R-pkg-devel] Wrong mailing list: Could the 100 byte path length limit be lifted?
On Wed, Dec 13, 2023 at 8:06?AM McGrath, Justin M <jmcgrath at illinois.edu> wrote:
On Windows, packages will be in "C:\Users\[User Name]\Documents\R\win-library\[R version]\[Package Name]".
In R (>= 4.2.0), the default R_LIBS_USER path has moved to under LOCALAPPDATA, e.g. "C:\Users\[User Name]\AppData\Local\R\win-library\[R version]". See https://cran.r-project.org/bin/windows/base/rw-FAQ.html FWIW, one workaround for too long paths on MS Windows is to map a long path to a drive letter, e.g. subst Y: 'C:/VeryLongPathToo/Users/JohnDoe/AppData/Local/R/'. and then work with Y: instead of C:. We had to use that in some projects with nested data folder structures. This approach is tedious, and might require special permissions (not sure). /Henrik
With a 150 byte limit, that leaves 70 bytes for the user name, R version and package name. That seems more than sufficient. If people are downloading the source files, that also leaves plenty of space regardless where they choose to extract the files.
________________________________________ From: Dirk Eddelbuettel <edd at debian.org> Sent: Wednesday, December 13, 2023 9:13 AM To: Tomas Kalibera Cc: Dirk Eddelbuettel; McGrath, Justin M; Ben Bolker; Martin Maechler; r-package-devel at r-project.org Subject: Re: [R-pkg-devel] Wrong mailing list: Could the 100 byte path length limit be lifted? On 13 December 2023 at 16:02, Tomas Kalibera wrote: | | On 12/13/23 15:59, Dirk Eddelbuettel wrote: | > On 13 December 2023 at 15:32, Tomas Kalibera wrote: | > | Please don't forget about what has been correctly mentioned on this | > | thread already: there is essentially a 260 character limit on Windows | > | (see | > | https://urldefense.com/v3/__https://blog.r-project.org/2023/03/07/path-length-limit-on-windows/index.html__;!!DZ3fjg!-NHAlEZQvY2kegkNVkuY3Lf84nKmMahrpZ4Euz2XXFDPvMWEcP28iepLlRiKzVZdAh752lyhHxd6zvk$ | > | for more). Even if the relative path length limit for a CRAN package was | > | no longer regarded important for tar compatibility, it would still make | > | sense for compatibility with Windows. It may still be a good service to | > | your users if you keep renaming the files to fit into that limit. | > | > So can lift the limit from 100 char to 260 char ? | | The 260 char limit is for the full path. A package would be extracted in | some directory, possibly also with a rather long name. Call a cutoff number. Any move from '100' to '100 + N' for any nonzero N is a win. Pick one, and then commit the change. N = 50 would be a great start as arbitrary as it is. Dirk -- dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org ______________________________________________ R-package-devel at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel