vcs-svn: Allow change nodes for root of tree (/)

It is not uncommon for a svn repository to include change records for
properties at the top level of the tracked tree:

	Node-path:
	Node-kind: dir
	Node-action: change
	Prop-delta: true
	Prop-content-length: 43
	Content-length: 43

	K 10
	svn:ignore
	V 11
	build-area

	PROPS-END

Unfortunately a recent svn-fe change (vcs-svn: More dump format sanity
checks, 2010-11-19) causes such nodes to be rejected with the error
message

	fatal: invalid dump: path to be modified is missing

The repo_tree module does not keep a dirent for the root of the tree.
Add a block to the dump parser to take care of this case.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9010-svn-fe.sh

@@ -580,6 +580,61 @@ test_expect_success 'property deltas supported' '
 	test_cmp expect actual
 '
 
+test_expect_success 'properties on /' '
+	reinit_git &&
+	cat <<-\EOF >expect &&
+	OBJID
+	OBJID
+	:000000 100644 OBJID OBJID A	greeting
+	EOF
+	sed -e "s/X$//" <<-\EOF >changeroot.dump &&
+	SVN-fs-dump-format-version: 3
+
+	Revision-number: 1
+	Prop-content-length: 10
+	Content-length: 10
+
+	PROPS-END
+
+	Node-path: greeting
+	Node-kind: file
+	Node-action: add
+	Text-content-length: 0
+	Prop-content-length: 10
+	Content-length: 10
+
+	PROPS-END
+
+	Revision-number: 2
+	Prop-content-length: 10
+	Content-length: 10
+
+	PROPS-END
+
+	Node-path: X
+	Node-kind: dir
+	Node-action: change
+	Prop-delta: true
+	Prop-content-length: 43
+	Content-length: 43
+
+	K 10
+	svn:ignore
+	V 11
+	build-area
+
+	PROPS-END
+	EOF
+	test-svn-fe changeroot.dump >stream &&
+	git fast-import <stream &&
+	{
+		git rev-list HEAD |
+		git diff-tree --root --always --stdin |
+		sed "s/$_x40/OBJID/g"
+	} >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'deltas for typechange' '
 	reinit_git &&
 	cat >expect <<-\EOF &&

vcs-svn/svndump.c

@@ -221,7 +221,10 @@ static void handle_node(void)
 	}
 	if (mark && type == REPO_MODE_DIR)
 		die("invalid dump: directories cannot have text attached");
-	if (node_ctx.action == NODEACT_CHANGE) {
+	if (node_ctx.action == NODEACT_CHANGE && !~*node_ctx.dst) {
+		if (type != REPO_MODE_DIR)
+			die("invalid dump: root of tree is not a regular file");
+	} else if (node_ctx.action == NODEACT_CHANGE) {
 		uint32_t mode = repo_modify_path(node_ctx.dst, 0, mark);
 		if (!mode)
 			die("invalid dump: path to be modified is missing");