How to call R Script from CRAN description file?

Package development
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1

Hi,

I have a package which is dependent on some file. So, I have written a script to download the file and set the env's.

But how to call that file from the description file?

Thanks,
sai

2

Even I am facing same problem. I need to download some file if not present from HTTPS website and then continue with the Build or package installation process.

3

There exist different places where you can hook into the installation process: You could use configure(.win) or, if the package contains compiled code, Makevars(.win). The latter approach is used by many packages to download static libraries on Windows, e.g. https://github.com/jeroen/curl/blob/master/src/Makevars.win.

2 Likes
4

Hi,
Plz forgive if I sound ridiculous as I am new to R. But how to use this in my package? How will I add this to my package binary so that during installation the .win file is called? Hope I have made my self clear.

Thanks for the help !

5

The configure(.win) file is called during installation of a source package, which is the same process used to create a binary package from a source package, c.f. https://cran.r-project.org/doc/manuals/R-exts.html#Configure-and-cleanup. So with this approach the file will become part of the binary package.

6

Hi,
Thanks for your help with the configure file. Can you please suggest how to configure the "makevars.win" content to "makevars.in" to be used in linux as I am trying to work in LINUX environment.
The content of "makevars.win" is as follows:

PKG_CPPFLAGS=-I"$(R_HOME)/foobar/include" -I"$(FOO_HOME)/foobar/include" -I.
PKG_LIBS=-L"$(R_HOME)/foobar/bin" -L"$(FOO_HOME)/foobar/bin" -lfooexec

I am trying to include C library in my source package to be used during installation of my R package using makevars.

Thanks for your help.

7

I am missing a bit of context here. Is the C library packaged with your package or do you expect it to be installed in the system, e.g. in $FOO_HOME?

8

Hi Thanks for asking this.
In my case, C library can be present in system classpath i.e. already present in system like you can see in the makevar.win i.e. "(FOO_HOME)/foobar/include" and "(FOO_HOME)/foobar/bin". If not present in system, my package need to download the same from a URL("https://xyz.com/test.tar.gz") and then unzip the downloaded package and then use the same to compile the R package.

Please let me know if you have any other queries.

Thanks for help

9

You might consider the approach taken by nloptr, c.f. https://github.com/jyypma/nloptr. In the configure script, it for a usable version of the nlopt library in the system. If none is found, it downloads and compiles the library from source. In the end a Makevars file is created based on Makevars.in and the correct library location.

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