findCRANmirror {utils}

R Documentation

Find CRAN Mirror Preference

Description

Find out if a CRAN mirror has been selected for the current session.

Usage

findCRANmirror(type = c("src", "web"))

Arguments

type	Is the mirror to be used for package sources or web information?

Details

Find out if a CRAN mirror has been selected for the current session. If so, return its URL else return ‘⁠"https://CRAN.R-project.org"⁠’.

The mirror is looked for in several places.

• The value of the environment variable R_CRAN_SRC or R_CRAN_WEB (depending on type), if set.

• An entry in getOption("repos") named ‘⁠CRAN⁠’ which is not the default ‘⁠"@CRAN@")⁠’.

• The ‘⁠CRAN⁠’ URL entry in the ‘repositories’ file (see setRepositories), if it is not the default ‘⁠"@CRAN@"⁠’.

The two types allow for partial local CRAN mirrors, for example those mirroring only the package sources where getOption("repos") might point to the partial mirror and R_CRAN_WEB point to a full (remote) mirror.

Value

A character string.

See Also

setRepositories, chooseCRANmirror

Examples

c(findCRANmirror("src"), findCRANmirror("web"))

Sys.setenv(R_CRAN_WEB = "https://cloud.r-project.org")
c(findCRANmirror("src"), findCRANmirror("web"))

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