parse: do not allow FullType entries to affect the current directory

As per the spec[1], Full entries must not affect the current directory.
Handling this incorrectly caused us issues with certain manifests (ones
with mixed Relative and Full entries, which is something casync does by
accident).

This is a partial fix for the issues with verifying casync-mtree's
output but there are a few other issues to iron out (including one
within casync).

[1]: https://man.netbsd.org/mtree.5

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

parse.go

@@ -72,27 +72,30 @@ func ParseSpec(r io.Reader) (*DirectoryHierarchy, error) {
 					break
 				}
 			}
+
 			// parse the options
 			f := strings.Fields(str)
 			e.Name = filepath.Clean(f[0])
+			e.Keywords = StringToKeyVals(f[1:])
+			// TODO: gather keywords if using tar stream
+			var isDir bool
+			for _, kv := range e.Keywords {
+				if kv.Keyword() == "type" {
+					isDir = kv.Value() == "dir"
+				}
+			}
 			if strings.Contains(e.Name, "/") {
 				e.Type = FullType
 			} else {
 				e.Type = RelativeType
-			}
-			e.Keywords = StringToKeyVals(f[1:])
-			// TODO: gather keywords if using tar stream
-			e.Parent = creator.curDir
-			for i := range e.Keywords {
-				kv := KeyVal(e.Keywords[i])
-				if kv.Keyword() == "type" {
-					if kv.Value() == "dir" {
-						creator.curDir = &e
-					} else {
-						creator.curEnt = &e
-					}
+				e.Parent = creator.curDir
+				if isDir {
+					creator.curDir = &e
 				}
 			}
+			if !isDir {
+				creator.curEnt = &e
+			}
 			e.Set = creator.curSet
 		default:
 			// TODO(vbatts) log a warning?