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README.md: add fetchGit

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@ -106,19 +106,20 @@ See [gitignoreFilter](docs/gitignoreFilter.md) for an example.
## Comparison
| Feature \ Implementation | cleanSource | [siers](https://github.com/siers/nix-gitignore) | [siers recursive](https://github.com/siers/nix-gitignore) | [icetan](https://github.com/icetan/nix-git-ignore-source) | [Profpatsch](https://github.com/Profpatsch/nixperiments/blob/master/filterSourceGitignore.nix) | [numtide](https://github.com/numtide/nix-gitignore) | this project
|-|-|-|-|-|-|-|-|
|Ignores .git | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️
|No special Nix configuration | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | | ✔️
|No import from derivation | ✔️ | ✔️ | | ✔️ | ✔️ | ✔️ | ✔️
|Uses subdirectory gitignores | | | ✔️ | | | ✔️ | ✔️
|Uses parent gitignores | | | | | |✔️ ?| ✔️
|Uses user gitignores | | | | | | ✔️ | ✔️
|Has a test suite | | ✔️ | ✔️ | ✔️ | | ? | ✔️
|Works with `restrict-eval` / Hydra | ✔️ | ✔️ | | ✔️ | ✔️ | | ✔️
|Descends into submodule correctly | | ? | ? | ? | ? |✔️ ?| ? #8
|Included in nixpkgs | ✔️ | ✔️ | ✔️ | | | |
<!-- |No traversal of ignored dirs | - | ✔️ |✔️ ?| ✔️ |✔️ ?|✔️ ?| ✔️ ? -->
| Feature \ Implementation | cleanSource | builtins.fetchGit<br/>/builtins.fetchTree | [siers](https://github.com/siers/nix-gitignore) | [siers recursive](https://github.com/siers/nix-gitignore) | [icetan](https://github.com/icetan/nix-git-ignore-source) | [Profpatsch](https://github.com/Profpatsch/nixperiments/blob/master/filterSourceGitignore.nix) | [numtide](https://github.com/numtide/nix-gitignore) | this project
|-|-|-|-|-|-|-|-|-|
|Reproducible | ✔️ | ! | ✔️ |✔️ ?| ✔️ |✔️ ?|✔️ ?| ✔️ ?
|Ignores .git | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️
|No special Nix configuration | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | ✔️ | | ✔️
|No import from derivation | ✔️ | ! | ✔️ | | ✔️ | ✔️ | ✔️ | ✔️
|Uses subdirectory gitignores | | ✔️ | | ✔️ | | | ✔️ | ✔️
|Uses parent gitignores | | ✔️ | | | | |✔️ ?| ✔️
|Uses user gitignores | | ✔️? | | | | | ✔️ | ✔️
|Has a test suite | | ✔️? | ✔️ | ✔️ | ✔️ | | ? | ✔️
|Works with `restrict-eval` / Hydra | ✔️ | ? | ✔️ | | ✔️ | ✔️ | | ✔️
|Descends into submodule correctly | | ✔️ | ? | ? | ? | ? |✔️ ?| ? #8
|Included in nixpkgs | ✔️ | ✔️ | ✔️ | ✔️ | | | |
|No traversal of ignored dirs<br/>(perf on large repos) | - | | ✔️ |✔️ ?| ✔️ |✔️ ?|✔️ ?| ✔️ ?
| | Legend |
|---|-------------------------------------|
@ -127,7 +128,12 @@ See [gitignoreFilter](docs/gitignoreFilter.md) for an example.
| | Not supported
|? | Probably not supported
|- | Not applicable or depends
|! | Caveats
Caveats:
- `fetchGit` is not reproducible. It has at least [one](https://github.com/NixOS/nix/pull/4635) serious reproducibility problem that requires a breaking change to fix. Unlike fixed-output derivations, a built-in fetcher does not have a pinned implementation!
- `fetchGit` blocks the evaluator, just like import from derivation
Please open a PR if you've found another feature, determined any of the '?' or found an inaccuracy!