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make descriptions of each installable type an own subsection

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Valentin Gagarin 2023-01-19 12:39:07 +01:00
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src/nix/nix.md
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@ -50,9 +50,17 @@ manual](https://nixos.org/manual/nix/stable/).
Many `nix` subcommands operate on one or more *installables*. These are
command line arguments that represent something that can be built in
the Nix store. Here are the recognised types of installables:
the Nix store.
* **Flake output attributes**: `nixpkgs#hello`
For most commands, if no installable is specified, the default is `.`,
i.e. Nix will operate on the default flake output attribute of the
flake in the current directory.
Here are the recognised types of installables:
## Flake output attributes
Example: `nixpkgs#hello`
These have the form *flakeref*[`#`*attrpath*], where *flakeref* is a
flake reference and *attrpath* is an optional attribute path. For
@ -108,12 +116,16 @@ the Nix store. Here are the recognised types of installables:
attributes `packages.x86_64-linux.hello`,
`legacyPackages.x86_64-linux.hello` and `hello`.
* **Store paths**: `/nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10`
## Store paths
Example: `/nix/store/v5sv61sszx301i0x6xysaqzla09nksnd-hello-2.10`
These are paths inside the Nix store, or symlinks that resolve to a
path in the Nix store.
* **Store derivations**: `/nix/store/p7gp6lxdg32h4ka1q398wd9r2zkbbz2v-hello-2.10.drv`
## Store derivations
Example: `/nix/store/p7gp6lxdg32h4ka1q398wd9r2zkbbz2v-hello-2.10.drv`
By default, if you pass a [store derivation] path to a `nix` subcommand, the command will operate on the [output path]s of the derivation.
@ -129,22 +141,22 @@ the Nix store. Here are the recognised types of installables:
If you want to operate on the store derivation itself, pass the
`--derivation` flag.
* **Nix attributes**: `--file /path/to/nixpkgs hello`
## Nix attributes
Example: `--file /path/to/nixpkgs hello`
When the `-f` / `--file` *path* option is given, installables are
interpreted as attribute paths referencing a value returned by
evaluating the Nix file *path*.
* **Nix expressions**: `--expr '(import <nixpkgs> {}).hello.overrideDerivation (prev: { name = "my-hello"; })'`.
## Nix expressions
Example: `--expr '(import <nixpkgs> {}).hello.overrideDerivation (prev: { name = "my-hello"; })'`.
When the `--expr` option is given, all installables are interpreted
as Nix expressions. You may need to specify `--impure` if the
expression references impure inputs (such as `<nixpkgs>`).
For most commands, if no installable is specified, the default is `.`,
i.e. Nix will operate on the default flake output attribute of the
flake in the current directory.
## Derivation output selection
Derivations can have multiple outputs, each corresponding to a