Try to substitute builtins.fetch* #3721
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builtins.fetch* aren’t technically derivations, so they never got substituted. To work around this, we can try to substitute this store path during evaluation. This can happen any time a hash is provided.
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Please check the flakes branch, it already does this: td::pair<Tree, Input> Input::fetch(ref<Store> store) const
{
if (!scheme)
throw Error("cannot fetch unsupported input '%s'", attrsToJson(toAttrs()));
/* The tree may already be in the Nix store, or it could be
substituted (which is often faster than fetching from the
original source). So check that. */
if (hasAllInfo()) {
try {
auto storePath = computeStorePath(*store);
store->ensurePath(storePath);
debug("using substituted/cached input '%s' in '%s'",
to_string(), store->printStorePath(storePath));
auto actualPath = store->toRealPath(storePath);
return {fetchers::Tree(std::move(actualPath), std::move(storePath)), *this};
} catch (Error & e) {
debug("substitution of input '%s' failed: %s", to_string(), e.what());
}
} |
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Actually this just applies to fetchTree right? I think it would still be useful for builtins.fetchurl & builtins.fetchTarball. I can make it match what fetchTree does though. |
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I get the other |
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Since fetchTree can do substitution on tarballs, I think we are mostly covered just doing fetchTree everywhere. |
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builtins.fetch* aren’t technically derivations, so they never got
substituted. To work around this, we can try to substitute this store
path during evaluation. This can happen any time a hash is provided.