Hi.

I need a very reproducible way of creating a R builds with a series of CRAN and 
Bioconductor packages.

I want to be able to download a specific version or R, a specific version of 
all packages and then install them in the right order (to make sure every 
package has the dependencies at installation time). I do not want to use 
install.packages or biocLite because they are not very transparent/reproducible
I have done it for R-3.0.2, but it has been rather slow and boring (Try 
installing a package, see the complaint, go into a working installation, load 
the package an figure out the version of all the related packages). 

I am wondering if there is an automated way, or a repository, to recursively 
retrieve all the package versions required in a certain version of R.

I am also looking into easybuild (http://easybuild.readthedocs.org/en/latest/), 
and, also there, knowing the exact path to all the packages in the right order 
seem crucial.

how do install.packages or biocLite know what version is required and where it 
is located?

Thanks a lot

Stefano

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