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rl-next: Add *general* note about git fetcher reimpl

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Robert Hensing 2024-01-05 19:01:12 +01:00
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doc/manual/rl-next/git-fetcher.md Normal file
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---
synopsis: "Nix now uses `libgit2` for Git fetching"
prs:
- 9240
- 9241
- 9258
- 9480
issues:
- 5313
---
Nix has built-in support for fetching sources from Git, during evaluation and locking; outside the sandbox.
The existing implementation based on the Git CLI had issues regarding reproducibility and performance.
Most of the original `fetchGit` behavior has been implemented using the `libgit2` library, which gives the fetcher fine-grained control.
Known issues:
- The `export-subst` behavior has not been reimplemented. [Partial](https://github.com/NixOS/nix/pull/9391#issuecomment-1872503447) support for this Git feature is feasible, but it did not make the release window.