On 2022-07-05 07:16, Robert Greener wrote:
> The current SRC_URI searches all the CRAN mirrors for
> /src/contrib/${PN}_${PV}.tar.gz. This is problematic. Once a package is updated
> on CRAN, the package is removed from this path and moved to
> /src/contrib/Archive/${PN}/${PN}_${PV}.tar.gz. The effect of this is
> that once a package goes out-of-date on CRAN, the ebuild will no longer
> build. This significantly increases the maintenance burden of dev-R/*
> packages, as it requires that they be up-to-date at all times.
>
> The proposal here, is to use just the main CRAN, so that every mirror
> doesn't have to be searched, to search the main repo, and then the
> archive. (also, some CRAN mirrors seem misconfigured and return a html
> document if the package is not found at
> /src/contrib/${PN}_${PV}.tar.gz). This means that if the package is
> out-of-date it will still build.
>
> Signed-off-by: Robert Greener <me@r0bert.dev>
> ---
>  eclass/R-packages.eclass | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/eclass/R-packages.eclass b/eclass/R-packages.eclass
> index aed8cce84..dd6b69933 100644
> --- a/eclass/R-packages.eclass
> +++ b/eclass/R-packages.eclass
> @@ -21,7 +21,10 @@ esac
> 
>  EXPORT_FUNCTIONS src_unpack src_prepare src_configure src_compile src_install pkg_postinst
> 
> -SRC_URI="mirror://cran/src/contrib/${PN}_${PV}.tar.gz"
> +SRC_URI="
> +     https://cran.r-project.org/src/contrib/${PN}_${PV}.tar.gz
> +     https://cran.r-project.org/src/contrib/Archive/${PN}/${PN}_${PV}.tar.gz
> +"

Multiple SRC_URI doesn't work as fallback. You need a custom src_fetch
function instead.