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checkout branch: prime cache-tree fully 

When switching to another branch, the earlier code relied on incremental
invalidation of cache-tree entries to degrade it.  While it is not wrong
per-se, we know that the resulting index must fully match the branch we
are switching to unless the -m (merge) option is used.

We should simply fully re-prime the cache-tree using the new tree object
in such a case.  And for safety, invalidate the cache-tree as a whole in
other cases.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Junio C Hamano 2009-04-20 03:58:20 -07:00
parent 456156dc06
commit 83ae209bf9
1 changed files with 8 additions and 1 deletions
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9
builtin-checkout.c
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@ -368,14 +368,17 @@ static int merge_working_tree(struct checkout_opts *opts,
int ret;
struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
int newfd = hold_locked_index(lock_file, 1);
int reprime_cache_tree = 0;

if (read_cache() < 0)
return error("corrupt index file");

cache_tree_free(&active_cache_tree);
if (opts->force) {
ret = reset_tree(new->commit->tree, opts, 1);
if (ret)
return ret;
reprime_cache_tree = 1;
} else {
struct tree_desc trees[2];
struct tree *tree;
@ -411,7 +414,9 @@ static int merge_working_tree(struct checkout_opts *opts,
init_tree_desc(&trees[1], tree->buffer, tree->size);

ret = unpack_trees(2, trees, &topts);
if (ret == -1) {
if (ret != -1) {
reprime_cache_tree = 1;
} else {
/*
* Unpack couldn't do a trivial merge; either
* give up or do a real merge, depending on
@ -455,6 +460,8 @@ static int merge_working_tree(struct checkout_opts *opts,
}
}

if (reprime_cache_tree)
prime_cache_tree(&active_cache_tree, new->commit->tree);
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock_file))
die("unable to write new index file");