Moves interactions with kicDriver's bin inside oci driver package

pkg/drivers/kic/oci/cache.go

@@ -0,0 +1,35 @@
+package oci
+
+import (
+	"os/exec"
+	"strings"
+
+	"k8s.io/minikube/pkg/minikube/image"
+)
+
+// ToDriverCache
+// calls OCIBIN's load command at specified path:
+// loads the archived container image at provided PATH.
+func ArchiveToDriverCache(ociBin, path string) (string, error) {
+	_, err := runCmd(exec.Command(ociBin, "load", "-i", path))
+	return "", err
+}
+
+// IsInCache
+// searches in OCIBIN's cache for the IMG; returns true if found. no error handling
+func IsImageInCache(ociBin, img string) (bool) {
+	res, err := runCmd(exec.Command(ociBin, "images", "--format", "{{.Repository}}:{{.Tag}}@{{.Digest}}"))
+	if err != nil {
+		// only the docker binary seems to have this issue..
+		// the docker.io/ substring is cut from the output and formatting doesn't help
+		if ociBin == Docker {
+			img = image.TrimDockerIO(img)
+		}
+
+		if strings.Contains(res.Stdout.String(), img){
+			return true
+		}
+	}
+
+	return false
+}

pkg/drivers/kic/oci/download.go

@@ -0,0 +1,11 @@
+package oci
+
+import (
+	"os/exec"
+	"bytes"
+)
+
+func PullImage(ociBin, img string) (bytes.Buffer, error) {
+	res, err := runCmd(exec.Command(ociBin, "pull", "--quiet", img))
+	return res.Stdout, err
+}