Configure different behaviors of renv.

## Details

For a given configuration option:

1. If an R option of the form renv.config.<name> is available, then that option's value will be used;

2. If an environment variable of the form RENV_CONFIG_<NAME> is available, then that option's value will be used;

3. Otherwise, the default for that particular configuration value is used.

Any periods (.)s in the option name are transformed into underscores (_) in the environment variable name, and vice versa. For example, the configuration option auto.snapshot could be configured as:

• options(renv.config.auto.snapshot = <...>)

• Sys.setenv(RENV_CONFIG_AUTO_SNAPSHOT = <...>)

Note that if both the R option and the environment variable are defined, the R option will be used instead. Environment variables can be more useful when you want a particular configuration to be automatically inherited by child processes; if that behavior is not desired, then the R option may be preferred.

If you want to set and persist these options across multiple projects, it is recommended that you set them in your user startup files (e.g. in ~/.Rprofile or ~/.Renviron).

## Configuration

The following renv configuration options are available:

 Name Type Default Description auto.snapshot logical[1] FALSE Automatically snapshot changes to the project library after a new package is installed with renv::install(), or removed with renv::remove()? bitbucket.host character[1] "api.bitbucket.org/2.0" The default Bitbucket host to be used during package retrieval. copy.method * "auto" The method to use when attempting to copy directories. See Copy Methods for more information. connect.timeout integer[1] 20L The amount of time to spend (in seconds) when attempting to download a file. Only used when the curl downloader is used. connect.retry integer[1] 3L The number of times to attempt re-downloading a file, when transient errors occur. Only used when the curl downloader is used. dependency.errors character[1] "reported" Many renv APIs require the enumeration of your project's R package dependencies. This option controls how errors that occur during this enumeration are handled. By default, errors are reported but are non-fatal. Set this to "fatal" to force errors to be fatal, and "ignored" to ignore errors altogether. See dependencies for more details. external.libraries character[*] NULL A character vector of external libraries, to be used in tandem with your projects. Be careful when using external libraries: it's possible that things can break within a project if the version(s) of packages used in your project library happen to be incompatible with packages in your external libraries; for example, if your project required xyz 1.0 but xyz 1.1 was present and loaded from an external library. Can also be an R function that provides the paths to external libraries. Library paths will be expanded through .expand_R_libs_env_var as necessary. filebacked.cache logical[1] TRUE Enable the renv file-backed cache? When enabled, renv will cache the contents of files that are read (e.g. DESCRIPTION files) in memory, thereby avoiding re-reading the file contents from the filesystem if the file has not changed. renv uses the file mtime to determine if the file has changed; consider disabling this if mtime is unreliable on your system. github.host character[1] "api.github.com" The default GitHub host to be used during package retrieval. gitlab.host character[1] "gitlab.com" The default GitLab host to be used during package retrieval. hydrate.libpaths character[*] NULL A character vector of library paths, to be used by renv::hydrate() when attempting to hydrate projects. When empty, the default set of library paths (as specified in ?hydrate) are used instead. See hydrate for more details. install.staged logical[1] TRUE DEPRECATED: Please use install.transactional instead. install.transactional logical[1] TRUE Perform a transactional install of packages during install and restore? When enabled, renv will first install packages into a temporary library, and later copy or move those packages back into the project library only if all packages were successfully downloaded and installed. This can be useful if you'd like to avoid mutating your project library if installation of one or more packages fails. mran.enabled logical[1] TRUE Attempt to download binaries from MRAN during restore? See vignette("mran", package = "renv") for more details. repos.override character[*] NULL Override the R package repositories used during restore. Primarily useful for deployment / continuous integration, where you might want to enforce the usage of some set of repositories over what is defined in renv.lock or otherwise set by the R session. rspm.enabled logical[1] TRUE Boolean; enable RSPM integration for renv projects? When TRUE, renv will attempt to transform the repository URLs used by RSPM into binary URLs as appropriate for the current platform. Set this to FALSE if you'd like to continue using source-only RSPM URLs, or if you find that renv is improperly transforming your repository URLs. sandbox.enabled logical[1] TRUE Enable sandboxing for renv projects? When active, renv will attempt to sandbox the system library, preventing non-system packages installed in the system library from becoming available in renv projects. (That is, only packages with priority "base" or "recommended", as reported by installed.packages(), are made available.) shims.enabled logical[1] TRUE Should renv shims be installed on package load? When enabled, renv will install its own shims over the functions install.packages(), update.packages() and remove.packages(), delegating these functions to renv::install(), renv::update() and renv::remove() as appropriate. snapshot.validate logical[1] TRUE Validate R package dependencies when calling snapshot? When TRUE, renv will attempt to diagnose potential issues in the project library before creating renv.lock -- for example, if a package installed in the project library depends on a package which is not currently installed. synchronized.check logical[1] TRUE Check that the project library is synchronized with the lockfile on load? updates.check logical[1] FALSE Check for package updates when the session is initialized? This can be useful if you'd like to ensure that your project lockfile remains up-to-date with packages as they are released on CRAN. updates.parallel * 2L Check for package updates in parallel? This can be useful when a large number of packages installed from non-CRAN remotes are installed, as these packages can then be checked for updates in parallel. user.library logical[1] FALSE Include the user library on the library paths for your projects? Note that this risks breaking project encapsulation and is not recommended for projects which you intend to share or collaborate on with other users. See also the caveats for the external.libraries option. user.profile logical[1] FALSE Load the user R profile (typically located at ~/.Rprofile) when renv is loaded? Consider disabling this if you require extra encapsulation in your projects; e.g. if your .Rprofile attempts to load packages that you might not install in your projects.

## Copy Methods

If you find that renv is unable to copy some directories in your environment, you may want to try setting the copy.method option. By default, renv will try to choose a system tool that is likely to succeed in copying files on your system -- robocopy on Windows, and cp on Unix. renv will also instruct these tools to preserve timestamps and attributes when copying files. However, you can select a different method as appropriate.

The following methods are supported:

 R Use R's built-in file.copy() function. cp Use cp to copy files. robocopy Use robocopy to copy files. (Only available on Windows.) rsync Use rsync to copy files.

You can also provide a custom copy method if required; e.g.

options(renv.config.copy.method = function(src, dst) {
# copy a file from 'src' to 'dst'
})

Note that renv will always first attempt to copy a directory first to a temporary path within the target folder, and then rename that temporary path to the final target destination. This helps avoid issues where a failed attempt to copy a directory could leave a half-copied directory behind in the final location.

## Project-Local Settings

For settings that should persist alongside a particular project, the various settings available in settings can be used.

## Examples


# disable automatic snapshots
options(renv.config.auto.snapshot = FALSE)

# disable with environment variable
Sys.setenv(RENV_CONFIG_AUTO_SNAPSHOT = "FALSE")