Each package should be stored in its own directory somewhere in the `pkgs/` tree, i.e. in `pkgs/category/subcategory/.../pkgname`. Below are some rules for picking the right category for a package. Many packages fall under several categories; what matters is the _primary_ purpose of a package. For example, the `libxml2` package builds both a library and some tools; but it’s a library foremost, so it goes under `pkgs/development/libraries`.
When in doubt, consider refactoring the `pkgs/` tree, e.g. creating new categories or splitting up an existing category.
**If it’s used to support _software development_:**
- **If it’s a _library_ used by other packages:**
-`development/libraries` (e.g. `libxml2`)
- **If it’s a _compiler_:**
-`development/compilers` (e.g. `gcc`)
- **If it’s an _interpreter_:**
-`development/interpreters` (e.g. `guile`)
- **If it’s a (set of) development _tool(s)_:**
- **If it’s a _parser generator_ (including lexers):**
The key words _must_, _must not_, _required_, _shall_, _shall not_, _should_, _should not_, _recommended_, _may_, and _optional_ in this section are to be interpreted as described in [RFC 2119](https://tools.ietf.org/html/rfc2119). Only _emphasized_ words are to be interpreted in this way.
In Nixpkgs, there are generally three different names associated with a package:
- The `pname` attribute of the derivation. This is what most users see, in particular when using `nix-env`.
- The variable name used for the instantiated package in `all-packages.nix`, and when passing it as a dependency to other functions. Typically this is called the _package attribute name_. This is what Nix expression authors see. It can also be used when installing using `nix-env -iA`.
- The filename for (the directory containing) the Nix expression.
Most of the time, these are the same. For instance, the package `e2fsprogs` has a `pname` attribute `"e2fsprogs"`, is bound to the variable name `e2fsprogs` in `all-packages.nix`, and the Nix expression is in `pkgs/os-specific/linux/e2fsprogs/default.nix`.
There are a few naming guidelines:
- The `pname` attribute _should_ be identical to the upstream package name.
- The `pname` and the `version` attribute _must not_ contain uppercase letters — e.g., `"mplayer" instead of `"MPlayer"`.
- The `version` attribute _must_ start with a digit e.g`"0.3.1rc2".
- If a package is a commit from a repository without a version assigned, then the `version` attribute _should_ be the latest upstream version preceding that commit, followed by `-unstable-` and the date of the (fetched) commit. The date _must_ be in `"YYYY-MM-DD"` format.
Example: Given a project had its latest releases `2.2` in November 2021, and `3.0` in January 2022, a commit authored on March 15, 2022 for an upcoming bugfix release `2.2.1` would have `version = "2.2-unstable-2022-03-15"`.
- Dashes in the package `pname`_should_ be preserved in new variable names, rather than converted to underscores or camel cased — e.g., `http-parser` instead of `http_parser` or `httpParser`. The hyphenated style is preferred in all three package names.
- If there are multiple versions of a package, this _should_ be reflected in the variable names in `all-packages.nix`, e.g. `json-c_0_9` and `json-c_0_11`. If there is an obvious “default” version, make an attribute like `json-c = json-c_0_9;`. See also [](#sec-versioning)
### Versioning {#sec-versioning}
Because every version of a package in Nixpkgs creates a potential maintenance burden, old versions of a package should not be kept unless there is a good reason to do so. For instance, Nixpkgs contains several versions of GCC because other packages don’t build with the latest version of GCC. Other examples are having both the latest stable and latest pre-release version of a package, or to keep several major releases of an application that differ significantly in functionality.
If there is only one version of a package, its Nix expression should be named `e2fsprogs/default.nix`. If there are multiple versions, this should be reflected in the filename, e.g. `e2fsprogs/1.41.8.nix` and `e2fsprogs/1.41.9.nix`. The version in the filename should leave out unnecessary detail. For instance, if we keep the latest Firefox 2.0.x and 3.5.x versions in Nixpkgs, they should be named `firefox/2.0.nix` and `firefox/3.5.nix`, respectively (which, at a given point, might contain versions `2.0.0.20` and `3.5.4`). If a version requires many auxiliary files, you can use a subdirectory for each version, e.g. `firefox/2.0/default.nix` and `firefox/3.5/default.nix`.
All versions of a package _must_ be included in `all-packages.nix` to make sure that they evaluate correctly.
### Import From Derivation {#ssec-import-from-derivation}
Import From Derivation (IFD) is disallowed in Nixpkgs for performance reasons:
[Hydra] evaluates the entire package set, and sequential builds during evaluation would increase evaluation times to become impractical.
[Hydra]: https://github.com/NixOS/hydra
Import From Derivation can be worked around in some cases by committing generated intermediate files to version control and reading those instead.
<!-- TODO: remove the following and link to Nix manual once https://github.com/NixOS/nix/pull/7332 is merged -->
See also [NixOS Wiki: Import From Derivation].
[NixOS Wiki: Import From Derivation]: https://nixos.wiki/wiki/Import_From_Derivation
## (Sources)
### Fetching Sources {#sec-sources}
There are multiple ways to fetch a package source in nixpkgs. The general guideline is that you should package reproducible sources with a high degree of availability. Right now there is only one fetcher which has mirroring support and that is `fetchurl`. Note that you should also prefer protocols which have a corresponding proxy environment variable.
You can find many source fetch helpers in `pkgs/build-support/fetch*`.
In the file `pkgs/top-level/all-packages.nix` you can find fetch helpers, these have names on the form `fetchFrom*`. The intention of these are to provide snapshot fetches but using the same api as some of the version controlled fetchers from `pkgs/build-support/`. As an example going from bad to good:
When fetching from GitHub, commits must always be referenced by their full commit hash. This is because GitHub shares commit hashes among all forks and returns `404 Not Found` when a short commit hash is ambiguous. It already happens for some short, 6-character commit hashes in `nixpkgs`.
It is a practical vector for a denial-of-service attack by pushing large amounts of auto generated commits into forks and was already [demonstrated against GitHub Actions Beta](https://blog.teddykatz.com/2019/11/12/github-actions-dos.html).
Find the value to put as `hash` by running `nix-shell -p nix-prefetch-github --run "nix-prefetch-github --rev 1f795f9f44607cc5bec70d1300150bfefcef2aae NixOS nix"`.
#### Obtaining source hash {#sec-source-hashes}
Preferred source hash type is sha256. There are several ways to get it.
1. Prefetch URL (with `nix-prefetch-XXX URL`, where `XXX` is one of `url`, `git`, `hg`, `cvs`, `bzr`, `svn`). Hash is printed to stdout.
2. Prefetch by package source (with `nix-prefetch-url '<nixpkgs>' -A PACKAGE.src`, where `PACKAGE` is package attribute name). Hash is printed to stdout.
This works well when you've upgraded existing package version and want to find out new hash, but is useless if package can't be accessed by attribute or package has multiple sources (`.srcs`, architecture-dependent sources, etc).
3. Upstream provided hash: use it when upstream provides `sha256` or `sha512` (when upstream provides `md5`, don't use it, compute `sha256` instead).
A little nuance is that `nix-prefetch-*` tools produce hash encoded with `base32`, but upstream usually provides hexadecimal (`base16`) encoding. Fetchers understand both formats. Nixpkgs does not standardize on any one format.
You can convert between formats with nix-hash, for example:
```ShellSession
$ nix-hash --type sha256 --to-base32 HASH
```
4. Extracting hash from local source tarball can be done with `sha256sum`. Use `nix-prefetch-url file:///path/to/tarball` if you want base32 hash.
5. Fake hash: set the hash to one of
-`""`
-`lib.fakeHash`
-`lib.fakeSha256`
-`lib.fakeSha512`
in the package expression, attempt build and extract correct hash from error messages.
::: {.warning}
You must use one of these four fake hashes and not some arbitrarily-chosen hash.
See [](#sec-source-hashes-security).
:::
This is last resort method when reconstructing source URL is non-trivial and `nix-prefetch-url -A` isn’t applicable (for example, [one of `kodi` dependencies](https://github.com/NixOS/nixpkgs/blob/d2ab091dd308b99e4912b805a5eb088dd536adb9/pkgs/applications/video/kodi/default.nix#L73)). The easiest way then would be replace hash with a fake one and rebuild. Nix build will fail and error message will contain desired hash.
Let's say Man-in-the-Middle (MITM) sits close to your network. Then instead of fetching source you can fetch malware, and instead of source hash you get hash of malware. Here are security considerations for this scenario:
-`http://` URLs are not secure to prefetch hash from;
- hashes from upstream (in method 3) should be obtained via secure protocol;
-`https://` URLs are secure in methods 1, 2, 3;
-`https://` URLs are secure in method 5 *only if* you use one of the listed fake hashes. If you use any other hash, `fetchurl` will pass `--insecure` to `curl` and may then degrade to HTTP in case of TLS certificate expiration.
### Patches {#sec-patches}
Patches available online should be retrieved using `fetchpatch`.
```nix
patches = [
(fetchpatch {
name = "fix-check-for-using-shared-freetype-lib.patch";
Otherwise, you can add a `.patch` file to the `nixpkgs` repository. In the interest of keeping our maintenance burden to a minimum, only patches that are unique to `nixpkgs` should be added in this way.
If a patch is available online but does not cleanly apply, it can be modified in some fixed ways by using additional optional arguments for `fetchpatch`. Check [](#fetchpatch) for details.
```nix
patches = [ ./0001-changes.patch ];
```
If you do need to do create this sort of patch file, one way to do so is with git:
1. Move to the root directory of the source code you're patching.
```ShellSession
$ cd the/program/source
```
2. If a git repository is not already present, create one and stage all of the source files.
```ShellSession
$ git init
$ git add .
```
3. Edit some files to make whatever changes need to be included in the patch.
4. Use git to create a diff, and pipe the output to a patch file:
```ShellSession
$ git diff -a > nixpkgs/pkgs/the/package/0001-changes.patch
- Run package-internal tests with `nix-build --attr pkgs.PACKAGE.passthru.tests`
- Run [NixOS tests](https://nixos.org/manual/nixos/unstable/#sec-nixos-tests) with `nix-build --attr nixosTest.NAME`, where `NAME` is the name of the test listed in `nixos/tests/all-tests.nix`
- Run [global package tests](https://nixos.org/manual/nixpkgs/unstable/#sec-package-tests) with `nix-build --attr tests.PACKAGE`, where `PACKAGE` is the name of the test listed in `pkgs/test/default.nix`
- See `lib/tests/NAME.nix` for instructions on running specific library tests
Tests are important to ensure quality and make reviews and automatic updates easy.
The following types of tests exists:
* [NixOS **module tests**](https://nixos.org/manual/nixos/stable/#sec-nixos-tests), which spawn one or more NixOS VMs. They exercise both NixOS modules and the packaged programs used within them. For example, a NixOS module test can start a web server VM running the `nginx` module, and a client VM running `curl` or a graphical `firefox`, and test that they can talk to each other and display the correct content.
* Nix **package tests** are a lightweight alternative to NixOS module tests. They should be used to create simple integration tests for packages, but cannot test NixOS services, and some programs with graphical user interfaces may also be difficult to test with them.
* The **`checkPhase` of a package**, which should execute the unit tests that are included in the source code of a package.
Here in the nixpkgs manual we describe mostly _package tests_; for _module tests_ head over to the corresponding [section in the NixOS manual](https://nixos.org/manual/nixos/stable/#sec-nixos-tests).
- [Multiple tests for nanopb](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/libraries/nanopb/default.nix)
### Linking NixOS module tests to a package {#ssec-nixos-tests-linking}
Like [package tests](#ssec-package-tests-writing) as shown above, [NixOS module tests](https://nixos.org/manual/nixos/stable/#sec-nixos-tests) can also be linked to a package, so that the tests can be easily run when changing the related package.
For example, assuming we're packaging `nginx`, we can link its module test via `passthru.tests`:
