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

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given `nix-copy-closure` exists, it doesn't make much sense to do

    nix-store --export $paths | nix-store --import --store ssh://foo@bar

since that dumps everything rather than granularly transferring store
objects as needed.

therefore, pick an example where dumping the entire closure into a file
actually makes a difference, such as when deploying to airgapped systems.
This commit is contained in:
Valentin Gagarin 2024-05-15 01:14:06 +02:00
parent 49bd408c10
commit d50ce2df14
1 changed files with 18 additions and 12 deletions
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30
doc/manual/src/command-ref/nix-store/export.md
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@ -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!
> ```