Difficulty creating a directory on mapped network drive

[jennybc]

Discovered while working on usethis.

I'm working in a project on a folder shared between a Windows VM guest and the macOS host.

fs can recursively add folders there, but not if the UNC path is used. It can list directory contents with such a path.

setwd("Z:/win10/frommacos")
getwd()
#> [1] "Z:/win10/frommacos"

library(usethis)
#> Warning: package 'usethis' was built under R version 3.6.1
library(fs)

proj_get()
#> <U+2714> Setting active project to '//vmware-host/Shared Folders/win10/frommacos'
#> //vmware-host/Shared Folders/win10/frommacos
proj_sitrep()
#> *   working_directory: 'Z:/win10/frommacos'
#> * active_usethis_proj: '//vmware-host/Shared Folders/win10/frommacos'
#> * active_rstudio_proj: <unset>
#> <U+25CF> Your working directory is not the same as the active usethis project.
#>   Set working directory to the project: `setwd(proj_get())`
#>   Set project to working directory:     `proj_set(getwd())`

dir_create("top_folder/subfolder")

proj_path()
#> //vmware-host/Shared Folders/win10/frommacos
dir_ls(proj_path())
#> //vmware-host/Shared Folders/win10/frommacos/R
#> //vmware-host/Shared Folders/win10/frommacos/top_folder
#> //vmware-host/Shared Folders/win10/frommacos/NAMESPACE
#> //vmware-host/Shared Folders/win10/frommacos/frommacos.Rproj
#> //vmware-host/Shared Folders/win10/frommacos/reprex.R
#> //vmware-host/Shared Folders/win10/frommacos/DESCRIPTION

proj_path("even_more/subfolder")
#> //vmware-host/Shared Folders/win10/frommacos/even_more/subfolder
dir_create(proj_path("even_more/subfolder"))
#> Error: [ENOENT] Failed to make directory '//vmware-host/Shared Folders': no such file or directory

dir_delete("top_folder")

^{Created on 2019-10-01 by the reprex package (v0.3.0.9000)}