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unpack-trees: add missing cache invalidation 

Any changes to the output index should be (confusingly) marked in the
source index with invalidate_ce_path(). This is used to make sure we
still have valid untracked cache and cache-tree extensions in the end.

We do a pretty good job of invalidating except in two places.
verify_clean_subdirectory() is part of verify_absent() and
verify_absent_sparse(). The former is usually called by merged_entry()
or directly in threeway_merge(). The latter is obviously used by
sparse checkout.

In these three call sites, only merged_entry() follows up with
invalidate_ce_path(). The other two don't, but they should not trigger
this ce removal because this is about D/F conflicts [1]. But let's be
safe and invalidate_ce_path() here as well.

The second place is keep_entry() which is also used by threeway_merge()
to keep higher stage entries. In order to reuse cache-tree we need to
invalidate these paths as well. It's not a problem in the past because
whenever a higher stage entry is present, cache-tree will not be
created [2]. Now we salvage cache-tree even when higher stage entries
are present, we need more invalidation.

[1] c81935348b (Fix switching to a branch with D/F when current branch
    has file D. - 2007-03-15)

[2] This is probably too strict. We should be able to create and save
    cache-tree for the directories that do not have conflict entries
    in cache_tree_update(). And this becomes more important when
    cache-tree plays bigger role in terms of performance.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2018-08-18 16:41:27 +02:00 committed by Junio C Hamano
parent 836ef2b69f
commit 5697ca9aa5
1 changed files with 3 additions and 0 deletions
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unpack-trees.c
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@ -1774,6 +1774,7 @@ static int verify_clean_subdirectory(const struct cache_entry *ce,
if (verify_uptodate(ce2, o))
return -1;
add_entry(o, ce2, CE_REMOVE, 0);
invalidate_ce_path(ce, o);
mark_ce_used(ce2, o);
}
cnt++;
@ -2033,6 +2034,8 @@ static int keep_entry(const struct cache_entry *ce,
struct unpack_trees_options *o)
{
add_entry(o, ce, 0, 0);
if (ce_stage(ce))
invalidate_ce_path(ce, o);
return 1;
}