Is there a way to tell biocLite() to install a Bioconductor package only if it is not installed already?

At the moment, I am running this code:

source('https://bioconductor.org/biocLite.R')

biocLite(listOfBiocPackages, ask = FALSE, lib = 'output/software/r/package/installation/')

where listOfBiocPackages is a vector of characters with names of Bioconductor packages.

If I update listOfBiocPackages, it is going to reinstall all the other packages again. Is there a way to tell biocLite() to only install packages that are not installed yet?

There might be an argument you can supply to biocLite(), but one strategy is that you can list packages that are already installed with installed.packages() and you can then use that to filter your installation vector, so something like:

notInstalled <- which( !listOfBiocPackages %in% rownames(installed.packages()) )

## check there's still something left to install
if( length(notInstalled) ) {
    biocLite(listOfBiocPackages[ notInstalled ])
}