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author | Vincent Ambo <mail@tazj.in> | 2022-05-02T10·32+0200 |
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committer | tazjin <tazjin@tvl.su> | 2022-05-02T23·34+0000 |
commit | 0ce396bdab902be626a9055e991551ce6120551e (patch) | |
tree | bf834c0bf9bff9886942e2e39d4690df5e704478 /nix/runExecline/default.nix | |
parent | 419dd2a7aa4523bf89f1ff2d4e876f6b85a3bacb (diff) |
feat(nix/lazy-deps): Add function to generate lazy binary dispatcher r/3996
There is a reoccuring problem in readTree-type repositories that use nix-shell, where evaluation of the full set of dependencies that should be made available to users takes a noticeable amount of time, slowing down operations when `direnv` is involved. In depot, we have so far fixed this by maintaining a manual `//bin` directory which contains a set of symlinks to a central dispatch script that can dispatch to various tools in depot lazily. This script can instead be generated ad-hoc by Nix (pretty fast if we can make assumptions like `git` and `nix-build` existing on user's machines already) and added to $PATH. The function introduced in this commit implements the logic for that. The structure of the script is based on the existing `//bin/__dispatch`. This does not yet switch depot's envrc to use this new method of installing dependencies lazily. Change-Id: I92efcd9bb6aa51aa2709ad910a464e9dac97ee89 Reviewed-on: https://cl.tvl.fyi/c/depot/+/5512 Tested-by: BuildkiteCI Reviewed-by: ezemtsov <eugene.zemtsov@gmail.com>
Diffstat (limited to 'nix/runExecline/default.nix')
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