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[R-pkg-devel] shapefile .dbf recognised as executable

Fri, Feb 11, 2022 3:38 PM

FWIW this seems to be a known issue (for some definition of known):

https://bugs.astron.com/view.php?id=316

A fix is to set your date when writing the DBF file to year 2021 instead of 2022 (which also explains why it worked last year ;)).

Cheers,
Simon

________________________________________
From: Duncan Murdoch <murdoch.duncan at gmail.com>
Sent: 12 February 2022 11:44
To: Murray Efford; R-package-devel at r-project.org
Subject: Re: [R-pkg-devel] shapefile .dbf recognised as executable

On 11/02/2022 5:22 p.m., Murray Efford wrote:
I have long distributed a small spatial ESRI shapefile as demonstration data in the extdata directory of 'secr'. It comprises the three files OVforest.shp, OVforest.dbf and OVforest.shx. I wanted to make minor changes (adding a coordinate reference system, dropping an attribute). I find that after merely reading (sf::st_read("OVforest.shp") and re-writing the same (sf::st_write("OVforest.shp")) the .dbf file is recognised by R CMD check as executable and raises a Warning (on GNU/Linux, but not in Windows).

No doubt this can be blamed on specifics of the driver used by sf::st_write, but I have been unable to find any settings that might change the behaviour.

I would like to know: Is this a false positive, and if not, How can I remove the executable component(s)? Can I apply the test used by R CMD check outside of R CMD check?

It's not easy to run just that test, but you can see it if you look here:

https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fwch%2Fr-source%2Fblob%2F988077a792e628677bd5884b351fe08b2c17b8c8%2Fsrc%2Flibrary%2Ftools%2FR%2Fcheck.R%23L4866-L4941&amp;data=04%7C01%7Cmurray.efford%40otago.ac.nz%7Ce242631c41c342f47d8908d9edb008b8%7C0225efc578fe4928b1579ef24809e9ba%7C0%7C0%7C637802163497599994%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=Z77T09j1sONATxupZGSmkayrpjt3Ra1g%2FS6vxQq8CJs%3D&amp;reserved=0

The basic idea is that it uses the "file" command.  There are some known
false positives.

If you are on Linux, try running "file OVforest.dbf" and see what it says.

Duncan Murdoch

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Thread (6 messages)

Murray Efford shapefile .dbf recognised as executable Feb 11 Duncan Murdoch shapefile .dbf recognised as executable Feb 11 Murray Efford shapefile .dbf recognised as executable Feb 11 Simon Urbanek shapefile .dbf recognised as executable Feb 11 Simon Urbanek shapefile .dbf recognised as executable Feb 11 Murray Efford shapefile .dbf recognised as executable Feb 11