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update-index: reduce scope of index expansion in do_reupdate

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Replace unconditional index expansion in 'do_reupdate()' with one scoped to
only where a full index is needed. A full index is only required in
'do_reupdate()' when a sparse directory in the index differs from HEAD; in
that case, the index is expanded and the operation restarted.

Because the index should only be expanded if a sparse directory is modified,
add a test ensuring the index is not expanded when differences only exist
within the sparse cone.

Signed-off-by: Victoria Dye <vdye@github.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Victoria Dye 2022-01-11 18:05:06 +00:00 committed by Junio C Hamano
parent c35e9f5ecd
commit b9ca5e2657
2 changed files with 15 additions and 4 deletions
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14
builtin/update-index.c
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@ -606,7 +606,7 @@ static struct cache_entry *read_one_ent(const char *which,
error("%s: not in %s branch.", path, which);
return NULL;
}
if (mode == S_IFDIR) {
if (!the_index.sparse_index && mode == S_IFDIR) {
if (which)
error("%s: not a blob in %s branch.", path, which);
return NULL;
@ -743,8 +743,6 @@ static int do_reupdate(int ac, const char **av,
*/
has_head = 0;
redo:
/* TODO: audit for interaction with sparse-index. */
ensure_full_index(&the_index);
for (pos = 0; pos < active_nr; pos++) {
const struct cache_entry *ce = active_cache[pos];
struct cache_entry *old = NULL;
@ -761,6 +759,16 @@ static int do_reupdate(int ac, const char **av,
discard_cache_entry(old);
continue; /* unchanged */
}
/* At this point, we know the contents of the sparse directory are
* modified with respect to HEAD, so we expand the index and restart
* to process each path individually
*/
if (S_ISSPARSEDIR(ce->ce_mode)) {
ensure_full_index(&the_index);
goto redo;
}
/* Be careful. The working tree may not have the
* path anymore, in which case, under 'allow_remove',
* or worse yet 'allow_replace', active_nr may decrease.

5
t/t1092-sparse-checkout-compatibility.sh
View File

@ -1265,7 +1265,10 @@ test_expect_success 'sparse index is not expanded: update-index' '
ensure_not_expanded update-index --add README.md &&
ensure_not_expanded update-index a &&
ensure_not_expanded update-index --remove deep/a
ensure_not_expanded update-index --remove deep/a &&
ensure_not_expanded reset --soft update-deep &&
ensure_not_expanded update-index --add --remove --again
'
test_expect_success 'sparse index is not expanded: blame' '