Change default cargo artifact installation to use symlinks where possible #150
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* Define a new installation mode which symlinks identical artifacts against a directory of previously generated ones * This allows for linear space usage in the Nix store across many chained derivations (as opposed to using a zstd compressed tarball which uses quadratic space across many chained derivations) * This new installation mode is the new default for all cargo based builds. The previous behavior is still available by setting `installCargoArtifactsMode = "use-zstd";` on a derivation * `buildPackage` will continue to use zstd compressed tarballs while building dependencies (unless either of `cargoArtifacts` or `installCargoArtifactsMode` is defined, in which case they will be honored)
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Motivation
against a directory of previously generated ones
chained derivations (as opposed to using a zstd compressed tarball
which uses quadratic space across many chained derivations)
builds. The previous behavior is still available by setting
installCargoArtifactsMode = "use-zstd";on a derivationbuildPackagewill continue to use zstd compressed tarballs whilebuilding dependencies (unless either of
cargoArtifactsorinstallCargoArtifactsModeis defined, in which case they will behonored)
Fixes #76
Checklist
docs/API.mdwith changesCHANGELOG.md