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Caching path info is generally useful. For instance, it speeds up "nix
path-info -rS /run/current-system" (i.e. showing the closure sizes of
all paths in the closure of the current system) from 5.6s to 0.15s.
This also eliminates some APIs like Store::queryDeriver() and
Store::queryReferences().
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This allows readFile() to indicate that a file doesn't exist, and
might eliminate some large string copying.
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This feature was implemented for Hydra, but Hydra no longer uses it.
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This imports signatures from one store into another. E.g.
$ nix copy-sigs -r /run/current-system -s https://cache.nixos.org/
imported 595 signatures
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This allows applying nix-store --verify-path to binary cache stores:
NIX_REMOTE=https://cache.nixos.org nix-store --verify-path /nix/store/s5c7...
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The public key can be derived from the secret key, so there's no need
for the user to supply it separately.
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This enables an optimisation in hydra-queue-runner, preventing a
download of a NAR it just uploaded to the cache when reading files
like hydra-build-products.
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This is primary to allow hydra-queue-runner to extract files like
"nix-support/hydra-build-products" from NARs in binary caches.
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So now you can do
$ NIX_REMOTE=file:///tmp/binary-cache nix-instantiate '<nixpkgs>' -A hello
and lots of other operations.
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So you can now do:
$ NIX_REMOTE=file:///tmp/binary-cache nix-store -qR /nix/store/...
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