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make a more relevant example for nix-store --export #10711

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tomberek merged 1 commit into from
May 19, 2024
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make a more relevant example for nix-store --export #10711

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30 changes: 18 additions & 12 deletions doc/manual/src/command-ref/nix-store/export.md
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Expand Up @@ -27,15 +27,21 @@ Nix store, the import will fail.

# Examples

To copy a whole closure, do something
like:

```console
$ nix-store --export $(nix-store --query --requisites paths) > out
```

To import the whole closure again, run:

```console
$ nix-store --import < out
```
> **Example**
>
> Deploy GNU Hello to an airgapped machine via USB stick.
>
> Write the closure to the block device on a machine with internet connection:
>
> ```shell-session
> [alice@itchy]$ storePath=$(nix-build '<nixpkgs>' -I nixpkgs=channel:nixpkgs-unstable -A hello --no-out-link)
> [alice@itchy]$ nix-store --export $(nix-store --query --requisites $storePath) | sudo dd of=/dev/usb
> ```
>
> Read the closure from the block device on the machine without internet connection:
>
> ```shell-session
> [bob@scratchy]$ hello=$(sudo dd if=/dev/usb | nix-store --import | tail -1)
> [bob@scratchy]$ $hello/bin/hello
> Hello, world!
> ```