Metadata cache fails on R 4.0.0 (R-devel currently)

[gaborcsardi]

Because there are no binaries available:

> meta_cache_list()
✖ Metadata update failed
⠹ Updating metadata [0/12] | Downloading [6.97 kB / 181.02 kB]Error in stop(http_error(resp)) :
Not Found (HTTP 404).

Could not load or update metadata cache. If you think your local cache
is broken, try deleting it with `meta_cache_cleanup()`, or the
`$cleanup()` method.

It is trying to download https://cloud.r-project.org/bin/macosx/el-capitan/contrib/4.0/PACKAGES.gz which is 404.

[hongooi73]

I'm currently getting Travis failures with checkpoint on R-devel, I guess this is the root cause?

[hongooi73]

This issue is actually fairly critical to the proper functioning of checkpoint. Is it possible to get an estimate on when it will be fixed?

Or as a workaround, maybe provide a pkgdepends policy that allows choosing the source version over the binary?

[hongooi73]

Ok, probably not so critical; I've just discovered that you can specify config=list(platforms="source") to download the source packages instead. Would still be nice to have this as an automatic fallback when binaries are unavailable though.