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read-tree A B: do not corrupt cache-tree

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An earlier commit aab3b9a (read-tree A B C: do not create a bogus index
and do not segfault, 2009-03-12) resurrected the support for an obscure
(but useful) feature to read and overlay more than one tree into the index
without the -m (merge) option.  But the fix was not enough.

Exercising this feature exposes a longstanding bug in the code that primes
the cache-tree in the index from the tree that was read.  The intention
was that when we know that the index must exactly match the tree we just
read, we prime the entire cache-tree with it.

However, the logic to detect that case incorrectly triggered if you read
two trees without -m.  This resulted in a corrupted cache-tree, and
write-tree would have produced an incorrect tree object out of such an
index.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2009-04-20 03:58:17 -07:00
parent 1f9b620fdb
commit 8cc21ce78c
1 changed files with 2 additions and 4 deletions
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6
builtin-read-tree.c
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@ -211,7 +211,6 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
case 3:
default:
opts.fn = threeway_merge;
cache_tree_free(&active_cache_tree);
break;
}
@ -221,6 +220,7 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
opts.head_idx = 1;
}
cache_tree_free(&active_cache_tree);
for (i = 0; i < nr_trees; i++) {
struct tree *tree = trees[i];
parse_tree(tree);
@ -235,10 +235,8 @@ int cmd_read_tree(int argc, const char **argv, const char *unused_prefix)
* valid cache-tree because the index must match exactly
* what came from the tree.
*/
if (nr_trees && !opts.prefix && (!opts.merge || (stage == 2))) {
cache_tree_free(&active_cache_tree);
if (nr_trees == 1 && !opts.prefix)
prime_cache_tree();
}
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(&lock_file))