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