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Add instruction to test with image-builder #199

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Add instruction to test with image-builder #199

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42 changes: 42 additions & 0 deletions docs/image-builder/README.md
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# Use case: Testing packer-plugin-powervs with [image builder](https://github.com/kubernetes-sigs/image-builder)

Note: The following steps are being executed on x86 VM.

1. Clone packer-plugin-powervs
```shell
$ git clone https://github.com/ppc64le-cloud/packer-plugin-powervs.git
```
2. Build the binary
```
$ cd packer-plugin-powervs
$ make build

This will build binary named `packer-plugin-powervs` under current directoy.
```
3. Clone the image-builder
```
$ git clone https://github.com/kubernetes-sigs/image-builder.git
```
4. Install the necessary dependencies for image-builder
```
$ cd images/capi
$ make deps-powervs
```
If the above command returns packages required error manually install them and retry.



5. Replace the downloaded PowerVS packer plugin with binary built in step 2

1. When we run ```make deps-powervs```, It will [download and install](https://github.com/kubernetes-sigs/image-builder/blob/main/images/capi/hack/ensure-powervs.sh#L42-L52) the PowerVS plugin in `"${HOME}/.packer.d/plugins/packer-plugin-powervs"` directory.
2. Get the name of the downloaded binary and replace it with binary built in step 2.
```shell
$ ls ${HOME}/.packer.d/plugins/packer-plugin-powervs/
$ mv /root/packer-plugin-powervs/packer-plugin-powervs ${HOME}/.packer.d/plugins/packer-plugin-powervs/packer-plugin-powervs_v0.2.1_x5.0_linux_amd64
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```

6. Update the image-builder script to avoid downloading the packer-plugin-powervs binary again from upstream.
1. When we run step 7, packer-plugin-powervs binary will be downloaded again from upstream, which will replace the binary we added in step 5.
2. To avoid replacing of binary,edit the [ensure-powervs.sh](https://github.com/kubernetes-sigs/image-builder/blob/main/images/capi/hack/ensure-powervs.sh#L42-L52) file to remove download and moving of upstream binary.

7. Run the image builder, Instructions can be found in [cluster-api-provider-ibmcloud](https://cluster-api-ibmcloud.sigs.k8s.io/developer/build-images#powervs)
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