Interact with the user to choose a CRAN mirror.
chooseCRANmirror(graphics = getOption("menu.graphics"), ind = NULL,
useHTTPS = getOption("useHTTPS", TRUE),
local.only = FALSE)getCRANmirrors(all = FALSE, local.only = FALSE)
Logical. If true, use a graphical list: on Windows or
the macOS GUI use a list box, and on a Unix-alike use a Tk widget if
package tcltk and an X server are available. Otherwise use a
text menu.
Optional numeric value giving which entry to select.
Whether to prefer secure mirrors.
Logical, get all known mirrors or only the ones flagged as OK.
Logical, try to get most recent list from the CRAN master or use file on local disk only.
None for chooseCRANmirror(), this function is invoked for its
side effect of updating options("repos").
getCRANmirrors() returns a data frame with mirror information.
A list of mirrors is stored in file
R_HOME/doc/CRAN_mirrors.csv, but first an on-line
list of current mirrors is consulted, and the file copy used only if
the on-line list is inaccessible.
This function is called by a Windows GUI menu item and by
contrib.url if it finds the initial dummy value of
options("repos").
The useHTTPS argument defaults to TRUE. With
useHTTPS = TRUE, HTTPS mirrors with mirroring over
ssh will be offered in preference to other mirrors (which
are listed in a sub-menu). If it is set to FALSE, no secure
mirrors will be offered. Choosing a secure mirror provides some
guarantees on the identity of the site chosen and so is
recommended. (All R builds support downloading from HTTPS sites.)
ind chooses a row in the list of current mirrors, by number. It
is best used with local.only = TRUE and row numbers in
R_HOME/doc/CRAN_mirrors.csv.