feat: Validate userdata (#593)

* feat: Validate userdata

Signed-off-by: Brad Beam <brad.beam@talos-systems.com>

pkg/userdata/install.go

@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package userdata
+
+// Install represents the installation options for preparing a node.
+type Install struct {
+	Boot         *BootDevice    `yaml:"boot,omitempty"`
+	Root         *RootDevice    `yaml:"root"`
+	Data         *InstallDevice `yaml:"data,omitempty"`
+	ExtraDevices []*ExtraDevice `yaml:"extraDevices,omitempty"`
+	Wipe         bool           `yaml:"wipe"`
+	Force        bool           `yaml:"force"`
+}
+
+// BootDevice represents the install options specific to the boot partition.
+type BootDevice struct {
+	InstallDevice `yaml:",inline"`
+
+	Kernel    string `yaml:"kernel"`
+	Initramfs string `yaml:"initramfs"`
+}
+
+// RootDevice represents the install options specific to the root partition.
+type RootDevice struct {
+	InstallDevice `yaml:",inline"`
+
+	Rootfs string `yaml:"rootfs"`
+}
+
+// InstallDevice represents the specific directions for each partition.
+type InstallDevice struct {
+	Device string `yaml:"device,omitempty"`
+	Size   uint   `yaml:"size,omitempty"`
+}
+
+// ExtraDevice represents the options available for partitioning, formatting,
+// and mounting extra disks.
+type ExtraDevice struct {
+	Device     string                  `yaml:"device,omitempty"`
+	Partitions []*ExtraDevicePartition `yaml:"partitions,omitempty"`
+}
+
+// ExtraDevicePartition represents the options for a device partition.
+type ExtraDevicePartition struct {
+	Size       uint   `yaml:"size,omitempty"`
+	MountPoint string `yaml:"mountpoint,omitempty"`
+}