Uki upgrade (#182)

pkg/uki/upgrade.go

@@ -3,9 +3,12 @@ package uki
 import (
 	hook "github.com/kairos-io/kairos-agent/v2/internal/agent/hooks"
 	"github.com/kairos-io/kairos-agent/v2/pkg/config"
+	"github.com/kairos-io/kairos-agent/v2/pkg/constants"
+	"github.com/kairos-io/kairos-agent/v2/pkg/elemental"
 	v1 "github.com/kairos-io/kairos-agent/v2/pkg/types/v1"
 	elementalUtils "github.com/kairos-io/kairos-agent/v2/pkg/utils"
 	events "github.com/kairos-io/kairos-sdk/bus"
+	"github.com/kairos-io/kairos-sdk/utils"
 )
 
 type UpgradeAction struct {
@@ -18,16 +21,30 @@ func NewUpgradeAction(cfg *config.Config, spec *v1.UpgradeUkiSpec) *UpgradeActio
 }
 
 func (i *UpgradeAction) Run() (err error) {
+	e := elemental.NewElemental(i.cfg)
+	cleanup := utils.NewCleanStack()
+	defer func() { err = cleanup.Cleanup(err) }()
 	// Run pre-install stage
 	_ = elementalUtils.RunStage(i.cfg, "kairos-uki-upgrade.pre")
 	_ = events.RunHookScript("/usr/bin/kairos-agent.uki.upgrade.pre.hook")
 
-	// Get source (from spec?)
-	// Copy the efi file into the proper dir
-	// Remove all boot manager entries?
-	// Create boot manager entry
-	// Set default entry to the one we just created
-
+	// REMOUNT /efi as RW (its RO by default)
+	umount, err := e.MountRWPartition(i.spec.EfiPartition)
+	if err != nil {
+		return err
+	}
+	cleanup.Push(umount)
+	// TODO: Check size of EFI partition to see if we can upgrade
+	// TODO: Check size of source to see if we can upgrade
+	// TODO: Check number of existing UKI files
+	// TODO: Load them, order them via semver
+	// TODO: Remove the latest one if its over the max number of entries
+	// Dump artifact to efi dir
+	_, err = e.DumpSource(constants.UkiEfiDir, i.spec.Active.Source)
+	if err != nil {
+		return err
+	}
+	
 	_ = elementalUtils.RunStage(i.cfg, "kairos-uki-upgrade.after")
 	_ = events.RunHookScript("/usr/bin/kairos-agent.uki.upgrade.after.hook") //nolint:errcheck