Add iso builder

This adds a new package for the iso builder run directly on go.
This is extracted from the original elemental-cli and then from the now
build-less kairos-agent

This uses no deps on elemental, only deps are on kairos-agent for the
config stuff mainly.

Signed-off-by: Itxaka <itxaka.garcia@spectrocloud.com>

tools-image/enki/pkg/utils/common.go

@@ -0,0 +1,40 @@
+package utils
+
+import (
+	"fmt"
+	"github.com/kairos-io/enki/pkg/constants"
+	v1 "github.com/kairos-io/kairos-agent/v2/pkg/types/v1"
+	"strings"
+)
+
+// CreateSquashFS creates a squash file at destination from a source, with options
+// TODO: Check validity of source maybe?
+func CreateSquashFS(runner v1.Runner, logger v1.Logger, source string, destination string, options []string) error {
+	// create args
+	args := []string{source, destination}
+	// append options passed to args in order to have the correct order
+	// protect against options passed together in the same string , i.e. "-x add" instead of "-x", "add"
+	var optionsExpanded []string
+	for _, op := range options {
+		optionsExpanded = append(optionsExpanded, strings.Split(op, " ")...)
+	}
+	args = append(args, optionsExpanded...)
+	out, err := runner.Run("mksquashfs", args...)
+	if err != nil {
+		logger.Debugf("Error running squashfs creation, stdout: %s", out)
+		logger.Errorf("Error while creating squashfs from %s to %s: %s", source, destination, err)
+		return err
+	}
+	return nil
+}
+
+func GolangArchToArch(arch string) (string, error) {
+	switch strings.ToLower(arch) {
+	case constants.ArchAmd64:
+		return constants.Archx86, nil
+	case constants.ArchArm64:
+		return constants.ArchArm64, nil
+	default:
+		return "", fmt.Errorf("invalid arch")
+	}
+}