Add inventory interface definition

This interface will be used by executors and other
commands to interact with remote hosts.

It is split into generic inventory and BaremetalInventory to
keep open door for cloud providers. In the future, if we
decide to that we need, for example list VMs in google, azure,
openstack or any other clouds, we would extend inventory interface
with approprate more sepcific inventory such as OpenstackInventory
etc...

Relates-To: #297

Change-Id: Ie19ed6047390e09a658c1e943b5e83d88e9668bf

pkg/inventory/ifc/interface.go

@@ -0,0 +1,52 @@
+/*
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+package ifc
+
+import (
+	"context"
+
+	remoteifc "opendev.org/airship/airshipctl/pkg/remote/ifc"
+)
+
+// Inventory interface for airshipctl
+type Inventory interface {
+	BaremetalInventory() (BaremetalInventory, error)
+}
+
+// BaremetalInventory interface that allows working with baremetal hosts
+type BaremetalInventory interface {
+	Select(BaremetalHostSelector) ([]remoteifc.Client, error)
+	SelectOne(BaremetalHostSelector) (remoteifc.Client, error)
+	RunOperation(context.Context, BaremetalOperation, BaremetalHostSelector, BaremetalBatchRunOptions) error
+}
+
+// BaremetalOperation baremetal operation
+type BaremetalOperation string
+
+const (
+	// BaremetalOperationReboot reboot
+	BaremetalOperationReboot BaremetalOperation = "reboot"
+	// BaremetalOperationPowerOff power off
+	BaremetalOperationPowerOff BaremetalOperation = "power-off"
+	// BaremetalOperationPowerOn power on
+	BaremetalOperationPowerOn BaremetalOperation = "power-on"
+	// BaremetalOperationEjectVirtualMedia eject virtual media
+	BaremetalOperationEjectVirtualMedia BaremetalOperation = "eject-virtual-media"
+)
+
+// BaremetalBatchRunOptions are options to be passed to RunOperation, this is to be
+// exetended in the future, to support such things as concurency
+type BaremetalBatchRunOptions struct {
+}

pkg/inventory/ifc/selectors.go

@@ -0,0 +1,51 @@
+/*
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+     https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+*/
+
+package ifc
+
+// BaremetalHostSelector allows to select baremetal hosts, if used empty all possible hosts
+// will be should be returned by Select() method of BaremetalInvenotry interface
+type BaremetalHostSelector struct {
+	PhaseSelector PhaseSelector
+	Name          string
+	Namespace     string
+	LabelSelector string
+}
+
+// PhaseSelector allows to select hosts based on phase they belong to
+type PhaseSelector struct {
+	Name      string
+	Namespace string
+}
+
+// ByName allows to select hosts based on their name
+func (s BaremetalHostSelector) ByName(name string) BaremetalHostSelector {
+	s.Name = name
+	return s
+}
+
+// ByNamespace allows to select hosts based on their namespace
+func (s BaremetalHostSelector) ByNamespace(name, namespace string) BaremetalHostSelector {
+	s.PhaseSelector = PhaseSelector{
+		Name:      name,
+		Namespace: namespace,
+	}
+	return s
+}
+
+// ByLabel allows to select hosts based on label
+func (s BaremetalHostSelector) ByLabel(label string) BaremetalHostSelector {
+	s.LabelSelector = label
+	return s
+}