Merge pull request containerd#10073 from dcantah/snapshotters-root-ex…

…port

Snapshotters: Export the root path

plugins/snapshots/blockfile/plugin/plugin.go

@@ -74,6 +74,7 @@ func init() {
 			}
 			opts = append(opts, blockfile.WithRecreateScratch(config.RecreateScratch))
 
+			ic.Meta.Exports[plugins.SnapshotterRootDir] = root
 			return blockfile.NewSnapshotter(root, opts...)
 		},
 	})

plugins/snapshots/btrfs/plugin/plugin.go

@@ -54,7 +54,7 @@ func init() {
 				root = config.RootPath
 			}
 
-			ic.Meta.Exports = map[string]string{"root": root}
+			ic.Meta.Exports[plugins.SnapshotterRootDir] = root
 			return btrfs.NewSnapshotter(root)
 		},
 	})

plugins/snapshots/devmapper/plugin/plugin.go

@@ -50,6 +50,7 @@ func init() {
 				config.RootPath = ic.Properties[plugins.PropertyRootDir]
 			}
 
+			ic.Meta.Exports[plugins.SnapshotterRootDir] = config.RootPath
 			return devmapper.NewSnapshotter(ic.Context, config)
 		},
 	})

plugins/snapshots/native/plugin/plugin.go

@@ -50,6 +50,7 @@ func init() {
 				root = config.RootPath
 			}
 
+			ic.Meta.Exports[plugins.SnapshotterRootDir] = root
 			return native.NewSnapshotter(root)
 		},
 	})

plugins/snapshots/overlay/plugin/plugin.go

@@ -92,7 +92,7 @@ func init() {
 				ic.Meta.Capabilities = append(ic.Meta.Capabilities, capaOnlyRemapIDs)
 			}
 
-			ic.Meta.Exports["root"] = root
+			ic.Meta.Exports[plugins.SnapshotterRootDir] = root
 			return overlay.NewSnapshotter(root, oOpts...)
 		},
 	})

plugins/types.go

@@ -93,3 +93,7 @@ const (
 	// PropertyTTRPCAddress is the ttrpc address used for client connections to containerd
 	PropertyTTRPCAddress = "io.containerd.plugin.ttrpc.address"
 )
+
+const (
+	SnapshotterRootDir = "root"
+)