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doc: document build --arch

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Signed-off-by: Simon de Vlieger <supakeen@redhat.com>
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Simon de Vlieger 2025-03-31 12:51:35 +02:00
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doc/01-usage.md
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@ -112,6 +112,16 @@ $ sudo image-builder build --distro fedora-43 minimal-raw
# ... progress ...
```
When passed `--arch` `image-builder` will try to do an experimental cross-architecture build. Note that not all image types are available for all architectures.
Cross-architecture builds are much slower than being able to build on native hardware. However, if no native hardware is available they might be an acceptable compromise.
```console
$ sudo image-builder build --arch s390x qcow2
WARNING: using experimental cross-architecture building to build "s390x"
# ... progress ...
```
# Blueprints
Images can be customized with [blueprints](https://osbuild.org/docs/user-guide/blueprint-reference). For example we could build the `qcow2` we built above with some customizations applied.