Ignore errcheck: error return value of unix.Unmount is not checked

Signed-off-by: Jan Rodák <[email protected]>

drivers/overlay/check.go

@@ -263,7 +263,9 @@ func supportsIdmappedLowerLayers(home string) (bool, error) {
 	if err := idmap.CreateIDMappedMount(lowerDir, lowerMappedDir, int(pid)); err != nil {
 		return false, fmt.Errorf("create mapped mount: %w", err)
 	}
-	defer unix.Unmount(lowerMappedDir, unix.MNT_DETACH)
+	defer func() {
+		_ = unix.Unmount(lowerMappedDir, unix.MNT_DETACH)
+	}()
 
 	opts := fmt.Sprintf("lowerdir=%s,upperdir=%s,workdir=%s", lowerMappedDir, upperDir, workDir)
 	flags := uintptr(0)

drivers/overlay/overlay.go

@@ -1553,7 +1553,9 @@ func (d *Driver) get(id string, disableShifting bool, options graphdriver.MountO
 	composefsMounts := []string{}
 	defer func() {
 		for _, m := range composefsMounts {
-			defer unix.Unmount(m, unix.MNT_DETACH)
+			defer func(m string) {
+				_ = unix.Unmount(m, unix.MNT_DETACH)
+			}(m)
 		}
 	}()
 
@@ -1657,7 +1659,9 @@ func (d *Driver) get(id string, disableShifting bool, options graphdriver.MountO
 				skipIDMappingLayers[composefsMount] = composefsMount
 				// overlay takes a reference on the mount, so it is safe to unmount
 				// the mapped idmounts as soon as the final overlay file system is mounted.
-				defer unix.Unmount(composefsMount, unix.MNT_DETACH)
+				defer func() {
+					_ = unix.Unmount(composefsMount, unix.MNT_DETACH)
+				}()
 			}
 			absLowers = append(absLowers, composefsMount)
 			continue
@@ -1764,7 +1768,9 @@ func (d *Driver) get(id string, disableShifting bool, options graphdriver.MountO
 
 				// overlay takes a reference on the mount, so it is safe to unmount
 				// the mapped idmounts as soon as the final overlay file system is mounted.
-				defer unix.Unmount(root, unix.MNT_DETACH)
+				defer func() {
+					_ = unix.Unmount(root, unix.MNT_DETACH)
+				}()
 			}
 
 			// relative path to the layer through the id mapped mount