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+# rpm-ostree
+
+The role supports running on [rpm-ostree](https://coreos.github.io/rpm-ostree/)
+systems. The primary issue is that the `/usr` filesystem is read-only, and the
+role cannot install packages. Instead, it will just verify that the necessary
+packages and any other `/usr` files are pre-installed. The role will change the
+package manager to one that is compatible with `rpm-ostree` systems.
+
+## Building
+
+To build an ostree image for a particular operating system distribution and
+version, use the script `.ostree/get_ostree_data.sh` to get the list of
+packages. If the role uses other system roles, then the script will include the
+packages for the other roles in the list it outputs.  The list of packages will
+be sorted in alphanumeric order.
+
+Usage:
+
+```bash
+.ostree/get_ostree_data.sh packages runtime DISTRO-VERSION FORMAT
+```
+
+`DISTRO-VERSION` is in the format that Ansible uses for `ansible_distribution`
+and `ansible_distribution_version` - for example, `Fedora-38`, `CentOS-8`,
+`RedHat-9.4`
+
+`FORMAT` is one of `toml`, `json`, `yaml`, `raw`
+
+* `toml` - each package in a TOML `[[packages]]` element
+
+```toml
+[[packages]]
+name = "package-a"
+version = "*"
+[[packages]]
+name = "package-b"
+version = "*"
+...
+```
+
+* `yaml` - a YAML list of packages
+
+```yaml
+- package-a
+- package-b
+...
+```
+
+* `json` - a JSON list of packages
+
+```json
+["package-a","package-b",...]
+```
+
+* `raw` - a plain text list of packages, one per line
+
+```bash
+package-a
+package-b
+...
+```
+
+What format you choose depends on which image builder you are using.  For
+example, if you are using something based on
+[osbuild-composer](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/composing_installing_and_managing_rhel_for_edge_images/index#creating-an-image-builder-blueprint-for-a-rhel-for-edge-image-using-the-command-line-interface_composing-a-rhel-for-edge-image-using-image-builder-command-line),
+you will probably want to use the `toml` output format.