Refactor to add oci and util packages

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

Change the sandbox directory path

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

oci/oci.go

@@ -0,0 +1,60 @@
+package oci
+
+import (
+	"path/filepath"
+	"strings"
+
+	"github.com/mrunalp/ocid/utils"
+)
+
+// New creates a new Runtime with options provided
+func New(runtimePath string, sandboxDir string) (*Runtime, error) {
+	r := &Runtime{
+		name:       filepath.Base(runtimePath),
+		path:       runtimePath,
+		sandboxDir: sandboxDir,
+	}
+	return r, nil
+}
+
+type Runtime struct {
+	name         string
+	path         string
+	sandboxDir   string
+	containerDir string
+}
+
+// Name returns the name of the OCI Runtime
+func (r *Runtime) Name() string {
+	return r.name
+}
+
+// Path returns the full path the OCI Runtime executable
+func (r *Runtime) Path() string {
+	return r.path
+}
+
+// SandboxDir returns the path to the base directory for storing sandbox configurations
+func (r *Runtime) SandboxDir() string {
+	return r.sandboxDir
+}
+
+// Version returns the version of the OCI Runtime
+func (r *Runtime) Version() (string, error) {
+	runtimeVersion, err := getOCIVersion(r.path, "-v")
+	if err != nil {
+		return "", err
+	}
+	return runtimeVersion, nil
+}
+
+func getOCIVersion(name string, args ...string) (string, error) {
+	out, err := utils.ExecCmd(name, args...)
+	if err != nil {
+		return "", err
+	}
+
+	firstLine := out[:strings.Index(out, "\n")]
+	v := firstLine[strings.LastIndex(firstLine, " ")+1:]
+	return v, nil
+}