Packrat is a dependency management system for R.
Use packrat to make your R projects more:
Start by installing Packrat:
Then, start a new R session at the base directory of your project and type:
This will install Packrat, set up a private library to be used for this
project, and then place you in
packrat mode. While in packrat mode, calls to
remove.packages will modify the
private project library, rather than the user library.
When you want to manage the state of your private library, you can use the Packrat functions:
packrat::snapshot(): Save the current state of your library.
packrat::restore(): Restore the library state saved in the most recent snapshot.
packrat::clean(): Remove unused packages from your library.
Share a Packrat project with
packrat::bundle(): Bundle a packrat project, for easy sharing.
packrat::unbundle(): Unbundle a packrat project, generating a project
directory with libraries restored from the most recent snapshot.
Navigate projects and set/get options with:
packrat::off(): Toggle packrat mode on and off, for
navigating between projects within a single R session.
packrat::set_opts: Get/set project-specific settings.
Manage ad-hoc local repositories (note that these are a separate entity from
packrat::set_opts(local.repos = ...) can be used to specify local
repositories; that is, directories containing (unzipped) package sources.
packrat::install_local() installs packages available in a local
For example, suppose I have the (unzipped) package sources for
within the folder
~/git/R/digest/. To install this package, you can use:
packrat::set_opts(local.repos = "~/git/R") packrat::install_local("digest")
There are also utility functions for using and managing packages in the
external / user library, and can be useful for leveraging packages in the user
library that you might not want as project-specific dependencies, e.g.
packrat::extlib(): Load an external package.
packrat::with_extlib(): With an external package, evaluate an expression. The external package is loaded only for the duration of the evaluated expression, but note that there may be other side effects associated with the package's
.onUnloadcalls that we may not be able to fully control.
Packrat supports a set of common analytic workflows:
packrat::init() to initialize packrat with your project,
and use it to manage your project library while you develop your analysis.
As you install and remove packages, you can use
packrat::restore() to maintain the R packages in your project. For
collaboration, you can either use your favourite version control system, or
packrat::bundle() to generate a bundled version of your project that
collaborators can use with
When-you're-done: take an existing or complete analysis (preferably
collected within one directory), and call
packrat::init() to immediately
obtain R package sources for all packages used in your project, and snapshot
that state so it can hence be preserved across time.
Please view the set-up guide here for a simple walkthrough in how you might set up your own, local, custom CRAN repository.
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