Download verified package indices
available_packages(contriburl = contrib.url(repos, type), method,
fields = NULL, type = getOption("pkgType"), filters = NULL,
repos = getOption("repos"), pubkey = NULL)
URL of the contrib section of the repository
Ignored, but included for compatibility with
available.packages
See available.packages
The type of package
See available.packages
Repositories
Path or contents of public key