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247 lines
6.7 KiB
Markdown
247 lines
6.7 KiB
Markdown
# niv
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[](https://niv.nmattia.com)
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Painless dependencies for [Nix] projects. Read more in the [Getting started](#getting-started) 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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`niv` is available in [`nixpkgs`](https://github.com/NixOS/nixpkgs) on the
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`master` branch as `niv`. It is also available on the `release-19.09` branch as
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`haskellPackages.niv`. Otherwise, run:
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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 some utility functions:
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* [Init](#init): bootstraps a Nix project, 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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* [Modify](#modify): modifies attributes _without_ performing an update.
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### Configuration
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The following environment variables are read by `niv`:
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| Name | Note |
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| --------------- | ---- |
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| GITHUB_TOKEN | When set, the value is used to authenticate GitHub API requests. |
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| GITHUB_HOST | The GitHub host to use when fetching packages. Port may be appended here. |
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| GITHUB_API_HOST | The host used when performing GitHub API requests. Use `GITHUB_API_PORT` for specifying the port. |
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| GITHUB_API_PORT | The port used when performing GitHub API requests. Defaults to `443` for secure requests. Defaults to `80` for insecure requests. See also: `GITHUB_INSECURE`. |
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| GITHUB_INSECURE | When set to anything but the empty string, requests are performed over `http` instead of `https`. |
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| GITHUB_PATH | The base path used when performing GitHub API requests. |
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The next two sections cover [common use cases](#getting-started) and [full command
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description](#commands).
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### Getting started
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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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Use the `init` command when starting a new Nix project or when porting an
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existing Nix project to niv:
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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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└── nix
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├── sources.json
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└── sources.nix
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1 directory, 2 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-19.09",
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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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To use those dependencies `import` the file `nix/sources.nix`, e.g.:
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``` nix
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{ sources ? import ./sources.nix }: # import the sources
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with
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{ overlay = _: pkgs:
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{ niv = import sources.niv {}; # use the sources :)
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};
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};
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import sources.nixpkgs # and use them again!
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{ overlays = [ overlay ] ; config = {}; }
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```
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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 19.09 when the command was run. Run the following command to
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update it:
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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-19.09 # equivalent to --branch nixos-19.09
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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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#### Modify
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```
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replace_niv_modify_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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[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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