Offline install of R package and dependencies

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The correct answer was given by Joshua Ulrich in the comment on the question:

The key is prefixing the argument to either repos or contriburl with file://. So in Unixy systems one could do:

install.packages("ggplot2", contriburl="file:///path/to/packages/")

This assumes that all required source packages, as well as a PACKAGES index file is available in /path/to/packages. If no PACKAGES file is present, this should be generated first using:

library(tools)
write_PACKAGES("/path/to/packages/")

which will generate an index of all source packages found in this directory. Note that in the example, there are 3 slashes behind the file: prefix. The third slash indicates a path relative to the root of the file system.

The difference between the repos and contriburl argument is that repos will append another /src/contrib to the path specified, as this is usually where source packages are located on an official CRAN repository mirror.

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