[PATCH/WIP 2/7] fast-import: be saner with temporary trees

[Dmitry Ivankov <divanorama@gmail.com>]

new_tree_entry() doesn't zero or otherwise initialize the returned
entry, neither does release_tree_entry(). So it is quite possible
to get previously released data in a new entry.

parse_ls doesn't set entry->versions[0] fields, but it does call
store_tree(entry) which looks for this base sha1 and tries to do
delta compression with that random object.

Reset entry->versions[0] fields to make things more predictable
and to avoid surprises here.

Signed-off-by: Dmitry Ivankov <divanorama@gmail.com>
---
 fast-import.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/fast-import.c b/fast-import.c
index 05cc55e..da9cb62 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -2968,6 +2968,9 @@ static void parse_ls(struct branch *b)
 	} else {
 		struct object_entry *e = parse_treeish_dataref(&p);
 		root = new_tree_entry();
+		hashclr(root->versions[0].sha1);
+		root->versions[0].mode = 0;
+		root->versions[1].mode = S_IFDIR;
 		hashcpy(root->versions[1].sha1, e->idx.sha1);
 		load_tree(root);
 		if (*p++ != ' ')
-- 
1.7.3.4