Add support for CDI device configuration

- Persist CDIDevices in container config
- Add e2e test
- Log HasDevice error and add additional condition for safety

Signed-off-by: Sebastian Jug <seb@stianj.ug>

vendor/github.com/container-orchestrated-devices/container-device-interface/specs-go/config.go

@@ -0,0 +1,50 @@
+package specs
+
+// Spec is the base configuration for CDI
+type Spec struct {
+	Version          string   `json:"cdiVersion"`
+	Kind             string   `json:"kind"`
+	KindShort        []string `json:"kindShort,omitempty"`
+	ContainerRuntime []string `json:"containerRuntime,omitempty"`
+
+	Devices        []Devices      `json:"devices"`
+	ContainerEdits ContainerEdits `json:"containerEdits,omitempty"`
+}
+
+// Devices is a "Device" a container runtime can add to a container
+type Devices struct {
+	Name           string         `json:"name"`
+	NameShort      []string       `json:"nameShort"`
+	ContainerEdits ContainerEdits `json:"containerEdits"`
+}
+
+// ContainerEdits are edits a container runtime must make to the OCI spec to expose the device.
+type ContainerEdits struct {
+	Env         []string      `json:"env,omitempty"`
+	DeviceNodes []*DeviceNode `json:"deviceNodes,omitempty"`
+	Hooks       []*Hook       `json:"hooks,omitempty"`
+	Mounts      []*Mount      `json:"mounts,omitempty"`
+}
+
+// DeviceNode represents a device node that needs to be added to the OCI spec.
+type DeviceNode struct {
+	HostPath      string   `json:"hostPath"`
+	ContainerPath string   `json:"containerPath"`
+	Permissions   []string `json:"permissions,omitempty"`
+}
+
+// Mount represents a mount that needs to be added to the OCI spec.
+type Mount struct {
+	HostPath      string   `json:"hostPath"`
+	ContainerPath string   `json:"containerPath"`
+	Options       []string `json:"options,omitempty"`
+}
+
+// Hook represents a hook that needs to be added to the OCI spec.
+type Hook struct {
+	HookName string   `json:"hookName"`
+	Path     string   `json:"path"`
+	Args     []string `json:"args,omitempty"`
+	Env      []string `json:"env,omitempty"`
+	Timeout  *int     `json:"timeout,omitempty"`
+}

vendor/github.com/container-orchestrated-devices/container-device-interface/specs-go/oci.go

@@ -0,0 +1,104 @@
+package specs
+
+import (
+	"errors"
+	"fmt"
+
+	spec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+// ApplyOCIEditsForDevice applies devices OCI edits, in other words
+// it finds the device in the CDI spec and applies the OCI patches that device
+// requires to the OCI specification.
+func ApplyOCIEditsForDevice(config *spec.Spec, cdi *Spec, dev string) error {
+	for _, d := range cdi.Devices {
+		if d.Name != dev {
+			continue
+		}
+
+		return ApplyEditsToOCISpec(config, &d.ContainerEdits)
+	}
+
+	return fmt.Errorf("CDI: device %q not found for spec %q", dev, cdi.Kind)
+}
+
+// ApplyOCIEdits applies the OCI edits the CDI spec declares globablly
+func ApplyOCIEdits(config *spec.Spec, cdi *Spec) error {
+	return ApplyEditsToOCISpec(config, &cdi.ContainerEdits)
+}
+
+// ApplyEditsToOCISpec applies the specified edits to the OCI spec.
+func ApplyEditsToOCISpec(config *spec.Spec, edits *ContainerEdits) error {
+	if config == nil {
+		return errors.New("spec is nil")
+	}
+	if edits == nil {
+		return nil
+	}
+
+	if len(edits.Env) > 0 {
+
+		if config.Process == nil {
+			config.Process = &spec.Process{}
+		}
+
+		config.Process.Env = append(config.Process.Env, edits.Env...)
+	}
+
+	for _, d := range edits.DeviceNodes {
+		config.Mounts = append(config.Mounts, toOCIDevice(d))
+	}
+
+	for _, m := range edits.Mounts {
+		config.Mounts = append(config.Mounts, toOCIMount(m))
+	}
+
+	for _, h := range edits.Hooks {
+		if config.Hooks == nil {
+			config.Hooks = &spec.Hooks{}
+		}
+		switch h.HookName {
+		case "prestart":
+			config.Hooks.Prestart = append(config.Hooks.Prestart, toOCIHook(h))
+		case "createRuntime":
+			config.Hooks.CreateRuntime = append(config.Hooks.CreateRuntime, toOCIHook(h))
+		case "createContainer":
+			config.Hooks.CreateContainer = append(config.Hooks.CreateContainer, toOCIHook(h))
+		case "startContainer":
+			config.Hooks.StartContainer = append(config.Hooks.StartContainer, toOCIHook(h))
+		case "poststart":
+			config.Hooks.Poststart = append(config.Hooks.Poststart, toOCIHook(h))
+		case "poststop":
+			config.Hooks.Poststop = append(config.Hooks.Poststop, toOCIHook(h))
+		default:
+			fmt.Printf("CDI: Unknown hook %q\n", h.HookName)
+		}
+	}
+
+	return nil
+}
+
+func toOCIHook(h *Hook) spec.Hook {
+	return spec.Hook{
+		Path:    h.Path,
+		Args:    h.Args,
+		Env:     h.Env,
+		Timeout: h.Timeout,
+	}
+}
+
+func toOCIMount(m *Mount) spec.Mount {
+	return spec.Mount{
+		Source:      m.HostPath,
+		Destination: m.ContainerPath,
+		Options:     m.Options,
+	}
+}
+
+func toOCIDevice(d *DeviceNode) spec.Mount {
+	return spec.Mount{
+		Source:      d.HostPath,
+		Destination: d.ContainerPath,
+		Options:     d.Permissions,
+	}
+}