49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
|
# Declarative Package Management {#sec-declarative-package-mgmt}
|
||
|
|
|
||
|
|
With declarative package management, you specify which packages you want
|
||
|
|
on your system by setting the option
|
||
|
|
[](#opt-environment.systemPackages). For instance, adding the
|
||
|
|
following line to `configuration.nix` enables the Mozilla Thunderbird
|
||
|
|
email application:
|
||
|
|
|
||
|
|
```nix
|
||
|
|
{
|
||
|
|
environment.systemPackages = [ pkgs.thunderbird ];
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
The effect of this specification is that the Thunderbird package from
|
||
|
|
Nixpkgs will be built or downloaded as part of the system when you run
|
||
|
|
`nixos-rebuild switch`.
|
||
|
|
|
||
|
|
::: {.note}
|
||
|
|
Some packages require additional global configuration such as D-Bus or
|
||
|
|
systemd service registration so adding them to
|
||
|
|
[](#opt-environment.systemPackages) might not be sufficient. You are
|
||
|
|
advised to check the [list of options](#ch-options) whether a NixOS
|
||
|
|
module for the package does not exist.
|
||
|
|
:::
|
||
|
|
|
||
|
|
You can get a list of the available packages as follows:
|
||
|
|
|
||
|
|
```ShellSession
|
||
|
|
$ nix-env -qaP '*' --description
|
||
|
|
nixos.firefox firefox-23.0 Mozilla Firefox - the browser, reloaded
|
||
|
|
...
|
||
|
|
```
|
||
|
|
|
||
|
|
The first column in the output is the *attribute name*, such as
|
||
|
|
`nixos.thunderbird`.
|
||
|
|
|
||
|
|
Note: the `nixos` prefix tells us that we want to get the package from
|
||
|
|
the `nixos` channel and works only in CLI tools. In declarative
|
||
|
|
configuration use `pkgs` prefix (variable).
|
||
|
|
|
||
|
|
To "uninstall" a package, remove it from
|
||
|
|
[](#opt-environment.systemPackages) and run `nixos-rebuild switch`.
|
||
|
|
|
||
|
|
```{=include=} sections
|
||
|
|
customizing-packages.section.md
|
||
|
|
adding-custom-packages.section.md
|
||
|
|
```
|