conf: introduce container configuration values

From the configuration file itself:

 These variables represent groupings of functionality in the CNCF
 landscape. In particular, they are areas where there is a choice
 between more than one implementation or an area where abstraction
 is beneficial.

 The contents of the variables are are runtime components that
 recipes may use for RDEPENDS.

 Build dependencies are not typically flexible, so do not currently
 have DEPENDS equivalents for the components (i.e. DEPENDS on runc
 versus crun).

 Distro features such as kubernetes or other container stacks
 can be used to set different defaults for these variables.

 Note: these are "global" values, since they represent choices.
 If more than of a grouping is required on target, then the variable
 can be appended or set to multiple values. That being said, Recipes
 should generally agree on the values, hence the global namespace.
 Recipe specific choices  can still be done, but they risk
 conflicting on target or causing runtime issues / errors.

 ## CNCF "components"

 # engines: docker-ce/docker-moby, virtual-containerd, cri-o, podman
 VIRTUAL-RUNTIME_container_engine ??= "podman"
 # runtime: runc, crun, runv, runx
 VIRTUAL-RUNTIME_container_runtime ??= "virtual-runc"
 # networking: cni, netavark
 VIRTUAL-RUNTIME_container_networking ??= "cni"
 # dns: cni, aardvark-dns
 VIRTUAL-RUNTIME_container_dns ??= "cni"
 # orchestration: k8s, k3s
 VIRTUAL-RUNTIME_container_orchestration ??= "k3s"

 ## Kubernetes terminology "components"

 VIRTUAL-RUNTIME_cri ??= "containerd"
 VIRTUAL-RUNTIME_cni ??= "cni"

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

2 files changed, 42 insertions, 0 deletions

diff --git a/conf/distro/include/meta-virt-container.inc b/conf/distro/include/meta-virt-container.inc
new file mode 100644
index 00000000..c3ac8394
--- /dev/null
+++ b/conf/distro/include/meta-virt-container.inc
@@ -0,0 +1,40 @@
+# These variables represent groupings of functionality in the CNCF
+# landscape. In particular, they are areas where there is a choice
+# between more than one implementation or an area where abstraction
+# is beneficial.
+#
+# The contents of the variables are are runtime components that
+# recipes may use for RDEPENDS.
+#
+# Build dependencies are not typically flexible, so do not currently
+# have DEPENDS equivalents for the components (i.e. DEPENDS on runc
+# versus crun).
+#
+# Distro features such as kubernetes or other container stacks
+# can be used to set different defaults for these variables.
+#
+# Note: these are "global" values, since they represent choices.
+# If more than of a grouping is required on target, then the variable
+# can be appended or set to multiple values. That being said, Recipes
+# should generally agree on the values, hence the global namespace.
+# Recipe specific choices  can still be done, but they risk
+# conflicting on target or causing runtime issues / errors.
+#
+
+## CNCF "components"
+
+# engines: docker-ce/docker-moby, virtual-containerd, cri-o, podman
+VIRTUAL-RUNTIME_container_engine ??= "podman"
+# runtime: runc, crun, runv, runx
+VIRTUAL-RUNTIME_container_runtime ??= "virtual-runc"
+# networking: cni, netavark
+VIRTUAL-RUNTIME_container_networking ??= "cni"
+# dns: cni, aardvark-dns
+VIRTUAL-RUNTIME_container_dns ??= "cni"
+# orchestration: k8s, k3s
+VIRTUAL-RUNTIME_container_orchestration ??= "k3s"
+
+## Kubernetes terminology "components"
+
+VIRTUAL-RUNTIME_cri ??= "virtual-containerd"
+VIRTUAL-RUNTIME_cni ??= "cni"
diff --git a/conf/layer.conf b/conf/layer.conf
index 10b457f8..88ac3905 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -52,9 +52,11 @@ INHERIT += "sanity-meta-virt"
 # layer.conf load time, we delay using a special bbclass that simply includes
 # the META_VIRT_CONFIG_PATH file, and likewise for the Xen and k8s configs
 META_VIRT_CONFIG_PATH = "${LAYERDIR}/conf/distro/include/meta-virt-default-versions.inc"
+META_VIRT_CONTAINER_CONFIG_PATH = "${LAYERDIR}/conf/distro/include/meta-virt-container.inc"
 META_VIRT_XEN_CONFIG_PATH = "${LAYERDIR}/conf/distro/include/meta-virt-xen.inc"
 K8S_CONFIG_PATH = "${LAYERDIR}/conf/distro/include/k8s-versions.inc"
 USER_CLASSES:append = " meta-virt-cfg"
+USER_CLASSES:append = " meta-virt-container-cfg"
 USER_CLASSES:append = " meta-virt-k8s-cfg"
 USER_CLASSES:append = " meta-virt-xen-cfg"
 USER_CLASSES:append = " meta-virt-hosts"