Overriding content in an old RHCOS AMI for testing

gistfile1.txt

First, given a build like: https://releases-art-rhcos.svc.ci.openshift.org/art/storage/releases/rhcos-4.3/43.81.201911081536.0/x86_64/meta.json

Download the qemu image:
```
$ curl -L https://releases-art-rhcos.svc.ci.openshift.org/art/storage/releases/rhcos-4.3/43.81.201911081536.0/x86_64/rhcos-43.81.201911081536.0-qemu.x86_64.qcow2.gz | gunzip > rhcos-43.81.201911081536.0-qemu.x86_64.qcow2
```

Download new RPM or other content you want, in this case let's assume it's a new hyperkube we want to drop in `/usr/bin`:

`$ curl -L http://example/openshift-hyperkube-4.3.0-201912131246.git.0.09a9468.el8.x86_64.rpm | rpm2cpio | cpio -div`

Run libguestfs:

```
$ guestfish -a rhcos-43.81.201911081536.0-qemu.x86_64.qcow2
```

Inside libguestfs:

```
# run
# mount /dev/sda4 /
# copy-in ./usr/bin/hyperkube /ostree/deploy/rhcos/deploy/<checksum>/usr/bin
# selinux-relabel /ostree/deploy/rhcos/deploy/<checksum>/etc/selinux/targeted/contexts/files/file_contexts /ostree/deploy/rhcos/deploy/<checksum>/usr/bin/hyperkube
# sync
# exit
```

Bless it as an AWS image via coreos-assembler:

```
$ /usr/lib/coreos-assembler/gf-oemid rhcos-43.81.201911081536.0-qemu.x86_64.qcow2 aws
```

Upload it.