This is why I keep encouraging folks to a) have a mirror & b) make sure their tools automatically pick up the mirrors.
I recently got mirror support upstreamed into Nixpkgs for fetchdarcs & fetchpijul which actually work on my just-alpha-released pinning tool, Nixtamal <https://darcs.toastal.in.th/nixtamal/trunk/README.rst>, for just this sort of thing.
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