2020-12-08 21:57:14 +00:00
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R""(
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# Examples
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* Pin `nixpkgs` to its most recent Git revision:
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```console
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# nix registry pin nixpkgs
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```
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Afterwards the user registry will have an entry like this:
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```console
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nix registry list | grep '^user '
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user flake:nixpkgs github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a
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```
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and `nix flake info` will say:
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```console
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# nix flake info nixpkgs
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Resolved URL: github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a
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Locked URL: github:NixOS/nixpkgs/925b70cd964ceaedee26fde9b19cc4c4f081196a
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…
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```
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2021-07-07 08:02:55 +00:00
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* Pin `nixpkgs` in a custom registry to its most recent Git revision:
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2021-06-30 19:13:32 +00:00
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```console
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# nix registry pin --registry ./custom-flake-registry.json nixpkgs
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```
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2020-12-08 21:57:14 +00:00
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# Description
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This command adds an entry to the user registry that maps flake
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reference *url* to the corresponding *locked* flake reference, that
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is, a flake reference that specifies an exact revision or content
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hash. This ensures that until this registry entry is removed, all uses
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of *url* will resolve to exactly the same flake.
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Entries can be removed using [`nix registry
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remove`](./nix3-registry-remove.md).
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)""
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