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Document the path flakeref format (#8640)

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* Document the path flakeref format

Fix https://github.com/NixOS/nix/issues/8482

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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Théophane Hufschmitt 2023-07-04 10:39:08 +02:00 committed by GitHub
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src/nix/flake.md
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@ -71,8 +71,6 @@ inputs.nixpkgs = {
Here are some examples of flake references in their URL-like representation:
* `.`: The flake in the current directory.
* `/home/alice/src/patchelf`: A flake in some other directory.
* `nixpkgs`: The `nixpkgs` entry in the flake registry.
* `nixpkgs/a3a3dda3bacf61e8a39258a0ed9c924eeca8e293`: The `nixpkgs`
entry in the flake registry, with its Git revision overridden to a
@ -93,6 +91,23 @@ Here are some examples of flake references in their URL-like representation:
* `https://github.com/NixOS/patchelf/archive/master.tar.gz`: A tarball
flake.
## Path-like syntax
Flakes corresponding to a local path can also be referred to by a direct path reference, either `/absolute/path/to/the/flake` or `./relative/path/to/the/flake` (note that the leading `./` is mandatory for relative paths to avoid any ambiguity).
The semantic of such a path is as follows:
* If the directory is part of a Git repository, then the input will be treated as a `git+file:` URL, otherwise it will be treated as a `path:` url;
* If the directory doesn't contain a `flake.nix` file, then Nix will search for such a file upwards in the file system hierarchy until it finds any of:
1. The Git repository root, or
2. The filesystem root (/), or
3. A folder on a different mount point.
### Examples
* `.`: The flake to which the current directory belongs to.
* `/home/alice/src/patchelf`: A flake in some other directory.
## Flake reference attributes
The following generic flake reference attributes are supported: