cache-tree: protect against "git prune".
We reused the cache-tree data without verifying the tree object
still exists. Recompute in cache_tree_update() an otherwise
valid cache-tree entry when the tree object disappeared.
This is not usually a problem, but theoretically without this
fix things can break when the user does something like this:
- read-index from a side branch
- write-tree the result
- remove the side branch with "git branch -D"
- remove the unreachable objects with "git prune"
- write-tree what is in the index.
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/cache-tree.c b/cache-tree.c
index f6d1dd1..b34b0bc 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -177,7 +177,7 @@
char *buffer;
int i;
- if (0 <= it->entry_count)
+ if (0 <= it->entry_count && has_sha1_file(it->sha1))
return it->entry_count;
/*
