repos_auth: CRAN-style Repository Authentication Credentials
In renozao/repotools: Tools for R Package Repositories

Gets/sets authentication credentials for CRAN-style.

1 2	repos_auth(..., save = FALSE, cache = NULL, exact = FALSE, .netrc = NULL)

`...`	repository keys or credential specifications
`save`	indicates if the new credentials are to be saved on disk, by updating in the `.netrc` file, or in a cache – which expires at the end of the R session. It can also be a character string, which then specifies the path where to save the result (cached entries are not written to disk). Use `save=""` to print to the console.
`cache`	specifies how the temporary cached credentials should be loaded: `NULL` loads both the cache and netrc data, with cache override matching netrc credentials; `TRUE` loads only the cache data; `FALSE` loads only the netrc data. The special value `cache = NA` will delete the cache, prior to any other operation.
`exact`	logical that indicates if the the repository keys should be matched exactly. If `FALSE`, then keys are matched independently of possible trailing path specification.
`.netrc`	path or connection to a netrc file, which is looked up for matching repository/host entries. Default is to look for file `'.netrc'` in the user's home directory. Repository and host credential entries are defined in an netrc file format (see `read_netrc` for more details). Repository shortcut keys start a `'@'`, e.g., `'@myRepo/path/to/repo'` and are substituted by the URL `'http://<login>:<password>@<machine><path>/path/to/repo'`, where <machine>, <path>, <login> and `<password>` are taken from the matched netrc specification. Regular hosts are also matched against the netrc specification to add credentials if necessary.