Misleading error when trying to do fread("folder")

If trying to fread("folder") a misleading error occurs:

>fread("~")
Error in fread("~") : 
  Opened file ok, obtained its size on disk (0.0MB), but couldn't memory map it.
This is a 64bit machine so this is surprising. Please report to datatable-help

I guess the error can be improved for such case.

Thanks for the report. Reproducible. Please make sure you've read the contribution guidelines.

I got the same error. Any developments on fixing it?

Is checking this equivalent to finding 0 MB file?

@MichaelChirico

@MichaelChirico Not sure, but I think they may refer to fread on directory.

@jangorecki

@jangorecki yes, I'm wondering if we have to do anything more complicated then adding an if size = 0 print("this is a directory") approach.

better then relying of size would be to use file.info("path")$isdir

@jangorecki

@jangorecki better than going in base would (could?) be to attack this as the internals of file.info do:

LOGICAL(isdir)[i] = (sb.st_mode & S_IFDIR) > 0;

(though to be honest I don't understand how the RHS of that code works)

Replace dir.exists with file.info, #989. Thanks Jan.

Check for directory *after* checking if file, #989.

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Misleading error when trying to do fread("folder") #989

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Misleading error when trying to do fread("folder") #989

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arunsrinivasan commented on Jan 3, 2015

scottgrimes commented on Jul 14, 2015

MichaelChirico commented on Sep 27, 2015

jangorecki commented on Sep 27, 2015

MichaelChirico commented on Sep 27, 2015

jangorecki commented on Sep 27, 2015

MichaelChirico commented on Sep 27, 2015

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