katautils: update paths to be configurable for rootless execution

Before using the default ctrsMapTrePath, check whether the runtime
is being ran rootlessly, and if so set the ctrsMapTreePath to the
rootlessRuntimeDir configured by the libpod rootless library.

Fixes: #1827

Signed-off-by: Gabi Beyer <gabrielle.n.beyer@intel.com>

pkg/katautils/oci.go

@@ -11,6 +11,9 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
+
+	"github.com/kata-containers/runtime/pkg/rootless"
 )
 
 const ctrsMappingDirMode = os.FileMode(0750)
@@ -22,6 +25,11 @@ func SetCtrsMapTreePath(path string) {
 	ctrsMapTreePath = path
 }
 
+// doUpdatePath returns whether a ctrsMapTreePath needs to be updated with a rootless prefix
+func doUpdatePath() bool {
+	return rootless.IsRootless() && !strings.HasPrefix(ctrsMapTreePath, rootless.GetRootlessDir())
+}
+
 // FetchContainerIDMapping This function assumes it should find only one file inside the container
 // ID directory. If there are several files, we could not determine which
 // file name corresponds to the sandbox ID associated, and this would throw
@@ -31,6 +39,10 @@ func FetchContainerIDMapping(containerID string) (string, error) {
 		return "", fmt.Errorf("Missing container ID")
 	}
 
+	if doUpdatePath() {
+		SetCtrsMapTreePath(filepath.Join(rootless.GetRootlessDir(), ctrsMapTreePath))
+	}
+
 	dirPath := filepath.Join(ctrsMapTreePath, containerID)
 
 	files, err := ioutil.ReadDir(dirPath)
@@ -62,6 +74,9 @@ func AddContainerIDMapping(ctx context.Context, containerID, sandboxID string) e
 		return fmt.Errorf("Missing sandbox ID")
 	}
 
+	if doUpdatePath() {
+		SetCtrsMapTreePath(filepath.Join(rootless.GetRootlessDir(), ctrsMapTreePath))
+	}
 	parentPath := filepath.Join(ctrsMapTreePath, containerID)
 
 	if err := os.RemoveAll(parentPath); err != nil {
@@ -86,6 +101,9 @@ func DelContainerIDMapping(ctx context.Context, containerID string) error {
 		return fmt.Errorf("Missing container ID")
 	}
 
+	if doUpdatePath() {
+		SetCtrsMapTreePath(filepath.Join(rootless.GetRootlessDir(), ctrsMapTreePath))
+	}
 	path := filepath.Join(ctrsMapTreePath, containerID)
 
 	return os.RemoveAll(path)