These alternatives are useful in situations where the administrator needs more control over the packages used by the content at runtime, for example when packages are centrally managed (e.g., internal company packages). While environment caching is the default behavior in Posit Connect, there are alternative approaches that can be used to share packages across content items. See the Runtime Caches section for details and instructions. In rare situations, systems maintenance requires you to clear the package caches. Distinct versions of packages are kept isolated from each other. Publish new content without worrying about package updates breaking existing, deployed content. The different applications and shiny versions coexist. Each Shiny application has an R environment with its expected shiny version. An old Shiny application built with shiny version 1.0.5 continues to use that package version even as newer deployments choose updated versions of shiny. The package cache allows multiple versions of a package to exist on a system. Deployments are faster when they can take advantage of previously-installed packages. Other Shiny applications built with the same version of the shiny package will use that cached installation. ![]() ![]() That version of shiny is placed into the package cache and associated with that Shiny application deployment. The shiny package, for example, is installed when the first Shiny application is deployed. The packrat package attempts to re-use R packages whenever possible. Otherwise, return use R’s internal tar implementation, which may encounter issues with long filenames.If on Windows, look for the system tar and use that if it exists.If a TAR environment variable is set, respect that.Packrat determines the tar binary to use with the following heuristic: ![]() Packrat uses the tar command to extract downloaded packages.
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