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# Constellation-OS Assembler
This container image uses [coreos assembler](https://coreos.github.io/coreos-assembler/) as a base (`quay.io/coreos-assembler/coreos-assembler`) to facilitate a build environment for the Constellation-OS.
The root filesystem takes its contents (OSTree) from [constellation-fedora-coreos-config](https://github.com/edgelesssys/constellation-fedora-coreos-config).
The constellation specific changes are tracked in this repository: https://github.com/edgelesssys/constellation-coreos-assembler
And the Constellation-OS Assembler can be pulled from ghcr.io/edgelesssys/constellation-coreos-assembler
## Setup
Prerequisites: `podman` and `qemu-kvm` are installed, nested virtualization is enabled.
Make sure your user is allowed read and write access on `/dev/kvm`.
If the device is not mounted in the container try the following command, and restart the container:
``` shell
sudo chmod 666 /dev/kvm
```
## Using the Assembler to create a bootable operating system
1. Create the assembler image as described [here](#creating-the-assembler-image)
2. Source the `fcos/.env` file to enable the `cosa` bash alias:
```
source fcos/.env
```
3. Set the `COORDINATOR_BINARY` environment variable to a path of the compiled coordinator binary. It will be mounted in the cosa container and copied into the resulting coreos image.
```
COORDINATOR_BINARY="/path/to/coordinator"
```
4. Go into the build folder and initialize cosa:
```
cd fcos/build
cosa init https://github.com/edgelesssys/constellation-fedora-coreos-config
cosa fetch
```
5. Build the OS image:
```
cosa build
```
6. Create an image for a cloud provider
```
cosa buildextend-gcp
cosa buildextend-aws
cosa buildextend-azure
[...]
```
## Using a locally checked out git repo of the coreos-config during development
Simply set the environment variable `COREOS_ASSEMBLER_CONFIG_GIT` to the local folder and perform the rest of the steps as usual:
```
COREOS_ASSEMBLER_CONFIG_GIT=/path/to/constellation-fedora-coreos-config
```