# niv [![CircleCI](https://circleci.com/gh/nmattia/niv.svg?style=svg)](https://circleci.com/gh/nmattia/niv) [![Netlify Status](https://api.netlify.com/api/v1/badges/48532eaa-259f-4ca2-aadf-67f7c6b957fd/deploy-status)](https://niv.nmattia.com) Painless dependencies for [Nix] projects. Read more in the [Getting started](#getting-started) section below.

## Install ``` bash $ nix-env -iA niv -f https://github.com/nmattia/niv/tarball/master ``` ## Build Inside the provided nix shell: ``` bash $ repl ``` Run the test suite with this command: ``` bash $ ./script/test ``` ## Usage `niv` simplifies [adding](#add) and [updating](#update) dependencies in Nix projects. It uses a single file, `nix/sources.json`, where it stores the data necessary for fetching and updating the packages. * [Add](#add): inserts a package in `nix/sources.json`. * [Update](#update): updates one or all packages in `nix/sources.json`. * [Drop](#drop): deletes a package from `nix/sources.json`. `niv` has two more utility functions: * [Init](#init): bootstraps a Nix project, in particular creates a `nix/sources.json` file containing `niv` and `nixpkgs` as well as a `nix/sources.nix` file that returns the sources as a Nix object. * [Show](#show): shows the packages' information. ### Configuration The following environment variables are read by `niv`: | Name | Note | | --------------- | ---- | | GITHUB_TOKEN | When set, the value is used to authenticate GitHub API requests. | | GITHUB_HOST | The GitHub host to use when fetching packages. Port may be appended here. | | GITHUB_API_HOST | The host used when performing GitHub API requests. Use `GITHUB_API_PORT` for specifying the port. | | 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`. | | GITHUB_INSECURE | When set to anything but the empty string, requests are performed over `http` instead of `https`. | | GITHUB_PATH | The base path used when performing GitHub API requests. | The next two sections cover [common use cases](#getting-started) and [full command description](#commands). ### Getting started This section covers common use cases: * [Bootstrapping a Nix project](#bootstrapping-a-nix-project). * [Tracking a different nixpkgs branch](#tracking-a-nixpkgs-branch). * [Importing packages from GitHub](#importing-packages-from-github). * [Fetching packages from custom URLs](#using-custom-urls). #### Bootstrapping a Nix project Use the `init` command when starting a new Nix project or when porting an existing Nix project to niv: ``` shell $ niv init ... $ tree . └── nix    ├── sources.json    └── sources.nix 1 directory, 2 files ``` The file `nix/sources.json` is the file used by niv to store versions and is initialized with niv and nixpkgs: ``` json { "nixpkgs": { "url": "https://github.com/NixOS/nixpkgs-channels/archive/109a28ab954a0ad129f7621d468f829981b8b96c.tar.gz", "owner": "NixOS", "branch": "nixos-19.03", "url_template": "https://github.com///archive/.tar.gz", "repo": "nixpkgs-channels", "sha256": "12wnxla7ld4cgpdndaipdh3j4zdalifk287ihxhnmrzrghjahs3q", "description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels", "rev": "109a28ab954a0ad129f7621d468f829981b8b96c" }, "niv": { "homepage": "https://github.com/nmattia/niv", "url": "https://github.com/nmattia/niv/archive/72e77204544527279e8f1e2d982d29503482b8f4.tar.gz", "owner": "nmattia", "branch": "master", "url_template": "https://github.com///archive/.tar.gz", "repo": "niv", "sha256": "1zjcyzxhq9iwxh58j5d7sx1vz5s3r1f6gpmnfgj2a3rxmclwvn3c", "description": "Easy dependency management for Nix projects", "rev": "72e77204544527279e8f1e2d982d29503482b8f4" } } ``` To use those dependencies `import` the file `nix/sources.nix`, e.g.: ``` nix { sources ? import ./sources.nix }: # import the sources with { overlay = _: pkgs: { niv = import sources.niv {}; # use the sources :) }; }; import sources.nixpkgs # and use them again! { overlays = [ overlay ] ; config = {}; } ``` #### Tracking a nixpkgs branch The `init` command sets the `nix/sources.json` file to track the latest commit present on nixpkgs 19.03 when the command was run. Run the following command to update it: ``` shell $ niv update nixpkgs ``` To change the branch being tracked run this command: ``` shell $ niv update nixpkgs -b nixos-19.03 # equivalent to --branch nixos-19.03 ``` #### Importing packages from GitHub The `add` command will infer information about the package being added, when possible. This works very well for GitHub repositories. Run this command to add [jq] to your project: ``` shell $ niv add stedolan/jq ``` The following data was added in `nix/sources.json` for `jq`: ``` json { "homepage": "http://stedolan.github.io/jq/", "url": "https://github.com/stedolan/jq/archive/9fa2e51099c55af56e3e541dc4b399f11de74abe.tar.gz", "owner": "stedolan", "branch": "master", "url_template": "https://github.com///archive/.tar.gz", "repo": "jq", "sha256": "0819rvk8057qgcqvgn7fpldvly2pfdw9fxcjrlqa8gr59p8a1cic", "description": "Command-line JSON processor", "rev": "9fa2e51099c55af56e3e541dc4b399f11de74abe" } ``` #### Using custom URLs It is possible to use niv to fetch packages from custom URLs. Run this command to add the Haskell compiler [GHC] to your `nix/sources.json`: ``` shell $ niv add ghc \ -v 8.4.3 \ -t 'https://downloads.haskell.org/~ghc//ghc--i386-deb8-linux.tar.xz' ``` The option `-v` sets the "version" attribute to `8.4.3`. The option `-t` sets a template that can be reused by niv when fetching a new URL (see the documentation for [add](#add) and [update](#update)). For updating the version of GHC used run this command: ``` shell $ niv update ghc -v 8.6.2 ``` ### Commands ``` niv - dependency manager for Nix projects version: 0.2.2 Usage: niv COMMAND Available options: -h,--help Show this help text Available commands: init Initialize a Nix project. Existing files won't be modified. add Add dependency show update Update dependencies modify Modify dependency drop Drop dependency ``` #### Add ``` Examples: niv add stedolan/jq niv add NixOS/nixpkgs-channels -n nixpkgs -b nixos-19.03 niv add my-package -v alpha-0.1 -t http://example.com/archive/.zip Usage: niv add [-n|--name NAME] PACKAGE ([-a|--attribute KEY=VAL] | [-b|--branch BRANCH] | [-o|--owner OWNER] | [-r|--repo REPO] | [-v|--version VERSION] | [-t|--template URL] | [-T|--type TYPE]) Add dependency Available options: -n,--name NAME Set the package name to -a,--attribute KEY=VAL Set the package spec attribute to -b,--branch BRANCH Equivalent to --attribute branch= -o,--owner OWNER Equivalent to --attribute owner= -r,--repo REPO Equivalent to --attribute repo= -v,--version VERSION Equivalent to --attribute version= -t,--template URL Used during 'update' when building URL. Occurrences of are replaced with attribute 'foo'. -T,--type TYPE The type of the URL target. The value can be either 'file' or 'tarball'. If not set, the value is inferred from the suffix of the URL. -h,--help Show this help text ``` #### Update ``` Examples: niv update # update all packages niv update nixpkgs # update nixpkgs niv update my-package -v beta-0.2 # update my-package to version "beta-0.2" Usage: niv update [PACKAGE] ([-a|--attribute KEY=VAL] | [-b|--branch BRANCH] | [-o|--owner OWNER] | [-r|--repo REPO] | [-v|--version VERSION] | [-t|--template URL] | [-T|--type TYPE]) Update dependencies Available options: -a,--attribute KEY=VAL Set the package spec attribute to -b,--branch BRANCH Equivalent to --attribute branch= -o,--owner OWNER Equivalent to --attribute owner= -r,--repo REPO Equivalent to --attribute repo= -v,--version VERSION Equivalent to --attribute version= -t,--template URL Used during 'update' when building URL. Occurrences of are replaced with attribute 'foo'. -T,--type TYPE The type of the URL target. The value can be either 'file' or 'tarball'. If not set, the value is inferred from the suffix of the URL. -h,--help Show this help text ``` #### Drop ``` Examples: niv drop jq niv drop my-package version Usage: niv drop PACKAGE [ATTRIBUTE] Drop dependency Available options: -h,--help Show this help text ``` #### Init ``` Usage: niv init Initialize a Nix project. Existing files won't be modified. Available options: -h,--help Show this help text ``` #### show ``` Usage: niv show [PACKAGE] Available options: -h,--help Show this help text ``` [Nix]: https://nixos.org/nix/ [jq]: https://stedolan.github.io/jq/ [GHC]: https://www.haskell.org/ghc/