[C++][R] copy_files() does not take paths to specific files

[asfimport]

copy_files() is a pretty handy function for working between local and remote interfaces, particularly for any file type arrow doesn't handle (arvo, ncdf, h5, etc etc). 

Unfortunately, it seems to work only from directory-to-directory, at least in the direction of copying S3 -> local file system.  e.g. this reprex:

library(arrow)
local_dir <- tempfile()
fs::dir_delete(local_dir)
fs::dir_create(local_dir) # create dir if it doesn't exist
l3 <- SubTreeFileSystem$create(local_dir)
l3$ls() #empty

s3 <- s3_bucket("neon4cast-targets/aquatics", endpoint_override = "data.ecoforecast.org", anonymous=TRUE)
s3$ls() #not empty, good

copy_files(s3$path("aquatics-targets.csv.gz"), l3$path("aquatics-targets.csv.gz"))
l3$ls() # darn, nothing!

copy_files(s3$path("aquatics-targets.csv.gz"), l3)
l3$ls() # darn, nothing!

copy_files(s3, l3)
l3$ls()  # Finally! only this works

Reporter: Carl Boettiger / @cboettig

Related issues:

• [R] copy_files doesn't make it easy to copy a single file (is duplicated by)

_{Note: This issue was originally created as ARROW-17120. Please see the migration documentation for further details.}

[kostovasandra]

DO you have any solution on this?