mirror of
https://github.com/nmattia/niv.git
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242 lines
6.3 KiB
Markdown
242 lines
6.3 KiB
Markdown
# niv
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[](https://circleci.com/gh/nmattia/niv)
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[](https://app.netlify.com/sites/brave-meninsky-83f073/deploys)
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Painless dependencies for [Nix] projects. Read more in the [use case
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section](#use-cases) section below.
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<p align="center">
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<img src="https://niv.nmattia.com/niv.svg">
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</p>
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## Install
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``` bash
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$ nix-env -iA niv -f https://github.com/nmattia/niv/tarball/master
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```
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## Build
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Inside the provided nix shell:
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``` bash
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$ repl
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```
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Run the test suite with this command:
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``` bash
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$ ./script/test
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```
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## Usage
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`niv` simplifies [adding](#add) and [updating](#update) dependencies in Nix
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projects. It uses a single file, `nix/sources.json`, where it stores the data
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necessary for fetching and updating the packages.
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* [Add](#add): inserts a package in `nix/sources.json`.
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* [Update](#update): updates one or all packages in `nix/sources.json`.
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* [Drop](#drop): deletes a package from `nix/sources.json`.
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`niv` has two more utility functions:
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* [Init](#init): bootstraps a Nix projects, in particular creates a
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`nix/sources.json` file containing `niv` and `nixpkgs` as well as a
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`nix/sources.nix` file that returns the sources as a Nix object.
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* [Show](#show): shows the packages' information.
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The next two sections cover [common use cases](#use-cases) and [full command
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description](#commands).
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### Use cases
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This section covers common use cases:
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* [Bootstrapping a Nix project](#bootstrapping-a-nix-project).
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* [Tracking a different nixpkgs branch](#tracking-a-nixpkgs-branch).
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* [Importing packages from GitHub](#importing-packages-from-github).
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* [Fetching packages from custom URLs](#using-custom-urls).
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#### Bootstrapping a Nix project
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There is an `init` command that is useful when starting a new Nix project or
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when porting an existing Nix project to the niv versioning:
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``` shell
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$ niv init
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...
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$ tree
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.
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├── default.nix
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├── nix
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│ ├── default.nix
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│ ├── packages.nix
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│ ├── sources.json
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│ └── sources.nix
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└── shell.nix
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1 directory, 6 files
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```
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The file `nix/sources.json` is the file used by niv to store versions and is
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initialized with niv and nixpkgs:
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``` json
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{
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"nixpkgs": {
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"url": "https://github.com/NixOS/nixpkgs-channels/archive/109a28ab954a0ad129f7621d468f829981b8b96c.tar.gz",
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"owner": "NixOS",
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"branch": "nixos-18.09",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
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"repo": "nixpkgs-channels",
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"sha256": "12wnxla7ld4cgpdndaipdh3j4zdalifk287ihxhnmrzrghjahs3q",
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"description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels",
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"rev": "109a28ab954a0ad129f7621d468f829981b8b96c"
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},
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"niv": {
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"homepage": "https://github.com/nmattia/niv",
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"url": "https://github.com/nmattia/niv/archive/72e77204544527279e8f1e2d982d29503482b8f4.tar.gz",
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"owner": "nmattia",
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"branch": "master",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
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"repo": "niv",
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"sha256": "1zjcyzxhq9iwxh58j5d7sx1vz5s3r1f6gpmnfgj2a3rxmclwvn3c",
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"description": "Easy dependency management for Nix projects",
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"rev": "72e77204544527279e8f1e2d982d29503482b8f4"
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}
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}
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```
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The content of this file can be used from Nix by importing `nix/sources.nix` as
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done in the generated `nix/default.nix` file:
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``` nix
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{ sources ? import ./sources.nix }:
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with
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{ overlay = _: pkgs:
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{ inherit (import sources.niv {}) niv;
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packages = pkgs.callPackages ./packages.nix {};
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};
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};
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import sources.nixpkgs
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{ overlays = [ overlay ] ; config = {}; }
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```
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The files `default.nix`, `shell.nix` and `nix/packages.nix` are placeholders
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for your project.
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#### Tracking a nixpkgs branch
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The `init` command sets the `nix/sources.json` file to track the latest commit
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present on nixpkgs 18.09 when the command was run. Run this commit to track
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update to the latest commit:
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``` shell
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$ niv update nixpkgs
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```
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To change the branch being tracked run this command:
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``` shell
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$ niv update nixpkgs -b nixos-19.03 # equivalent to --branch nixos-19.03
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```
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#### Importing packages from GitHub
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The `add` command will infer information about the package being added, when
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possible. This works very well for GitHub repositories. Run this command to add
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[jq] to your project:
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``` shell
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$ niv add stedolan/jq
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```
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The following data was added in `nix/sources.json` for `jq`:
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``` json
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{
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"homepage": "http://stedolan.github.io/jq/",
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"url": "https://github.com/stedolan/jq/archive/9fa2e51099c55af56e3e541dc4b399f11de74abe.tar.gz",
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"owner": "stedolan",
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"branch": "master",
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"url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
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"repo": "jq",
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"sha256": "0819rvk8057qgcqvgn7fpldvly2pfdw9fxcjrlqa8gr59p8a1cic",
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"description": "Command-line JSON processor",
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"rev": "9fa2e51099c55af56e3e541dc4b399f11de74abe"
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}
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```
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#### Using custom URLs
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It is possible to use niv to fetch packages from custom URLs. Run this command
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to add the Haskell compiler [GHC] to your `nix/sources.json`:
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``` shell
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$ niv add ghc \
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-v 8.4.3 \
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-t 'https://downloads.haskell.org/~ghc/<version>/ghc-<version>-i386-deb8-linux.tar.xz'
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```
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The option `-v` sets the "version" attribute to `8.4.3`. The option `-t` sets a
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template that can be reused by niv when fetching a new URL (see the
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documentation for [add](#add) and [update](#update)).
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For updating the version of GHC used run this command:
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``` shell
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$ niv update ghc -v 8.6.2
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```
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### Commands
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```
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replace_niv_help
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```
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#### Add
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```
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replace_niv_add_help
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```
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#### Update
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```
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replace_niv_update_help
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```
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#### Drop
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```
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replace_niv_drop_help
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```
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#### Init
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```
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replace_niv_init_help
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```
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#### show
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```
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replace_niv_show_help
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```
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## Related
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* [nix-flakes]: `niv` support a subset of the Nix flakes. In particular it does
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not perform any kind of dependency resolution.
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* [nix-path]: `niv` and `nix-path` share a similar goal and ideas tend to flow
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back and forth freely.
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[Nix]: https://nixos.org/nix/
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[jq]: https://stedolan.github.io/jq/
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[GHC]: https://www.haskell.org/ghc/
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[nix-flakes]: https://gist.github.com/edolstra/40da6e3a4d4ee8fd019395365e0772e7
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[nix-path]: https://github.com/zimbatm/nix-path
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