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76 lines
1.9 KiB
Markdown
76 lines
1.9 KiB
Markdown
(ref-pinning-nixpkgs)=
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# Pinning Nixpkgs
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Specifying remote Nix expressions, such as the one provided by Nixpkgs, can be done in several ways:
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- [`-I` option](https://nixos.org/manual/nix/stable/command-ref/opt-common.html#opt-I) to most of commands like `nix-build`, `nix-shell`, etc.
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- [`$NIX_PATH` environment variable](https://nixos.org/manual/nix/stable/command-ref/env-common.html#env-NIX_PATH)
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- Using [builtins.fetchTarball](https://nixos.org/manual/nix/stable/expressions/builtins.html) to fetch a Nix expression at evaluation time
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## Possible `URL` values
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- Local file path.
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Using `./.` means that the expression is located in a file `default.nix` the current directory.
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- Pinned to a specific commit
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```
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https://github.com/NixOS/nixpkgs/archive/eabc38219184cc3e04a974fe31857d8e0eac098d.tar.gz
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```
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- Using the latest channel version, meaning all tests have passed
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```
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http://nixos.org/channels/nixos-22.11/nixexprs.tar.xz
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```
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Shorthand syntax for `NIX_PATH` and `-I`:
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```
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channel:nixos-22.11`
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```
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- Using the latest channel version, hosted by GitHub
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```
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https://github.com/NixOS/nixpkgs/archive/nixos-22.11.tar.gz
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```
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- Using the latest commit on the release branch, but not tested yet
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```
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https://github.com/NixOS/nixpkgs/archive/release-21.11.tar.gz
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```
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## Examples
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- ```shell-session
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$ nix-build -I ~/dev
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```
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- ```shell-session
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$ nix-build -I nixpkgs=http://nixos.org/channels/nixos-22.11/nixexprs.tar.xz`
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```
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- ```shell-session
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$ nix-build -I nixpkgs=channel:nixos-22.11`
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```
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- ```shell-session
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$ NIX_PATH=nixpkgs=http://nixos.org/channels/nixos-22.11/nixexprs.tar.xz nix-build ...`
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```
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- ```shell-session
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$ NIX_PATH=nixpkgs=channel:nixos-22.11 nix-build ...`
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```
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- In the Nix language:
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```nix
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let
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pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-22.11.tar.gz") {};
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in pkgs.stdenv.mkDerivation { ... }
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```
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