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object-name: reject trees found in the index

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The get_oid_with_context_1() method is used when parsing revision
arguments. One particular case is to take a ":<path>" string and search
the index for the given path.

In the case of a sparse index, this might find a sparse directory entry,
in which case the contained object is a tree. In the case of a full
index, this search within the index would fail.

In order to maintain identical return state as in a full index, inspect
the discovered cache entry to see if it is a sparse directory and reject
it. This requires being careful around the only_to_die option to be sure
we die only at the correct time.

This changes the behavior of 'git show :<sparse-dir>', but does not
bring it entirely into alignment with a full index case. It specifically
hits the wrong error message within diagnose_invalid_index_path(). That
error message will be corrected in a future change.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2022-04-26 20:43:18 +00:00 committed by Junio C Hamano
parent a37d14422a
commit 561287d342
2 changed files with 20 additions and 10 deletions
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19
object-name.c
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@ -1881,6 +1881,20 @@ static char *resolve_relative_path(struct repository *r, const char *rel)
rel);
}
static int reject_tree_in_index(struct repository *repo,
int only_to_die,
const struct cache_entry *ce,
int stage,
const char *prefix,
const char *cp)
{
if (!S_ISSPARSEDIR(ce->ce_mode))
return 0;
if (only_to_die)
diagnose_invalid_index_path(repo, stage, prefix, cp);
return -1;
}
static enum get_oid_result get_oid_with_context_1(struct repository *repo,
const char *name,
unsigned flags,
@ -1955,9 +1969,12 @@ static enum get_oid_result get_oid_with_context_1(struct repository *repo,
memcmp(ce->name, cp, namelen))
break;
if (ce_stage(ce) == stage) {
free(new_path);
if (reject_tree_in_index(repo, only_to_die, ce,
stage, prefix, cp))
return -1;
oidcpy(oid, &ce->oid);
oc->mode = ce->ce_mode;
free(new_path);
return 0;
}
pos++;

11
t/t1092-sparse-checkout-compatibility.sh
View File

@ -1165,15 +1165,8 @@ test_expect_success 'show (cached blobs/trees)' '
test_must_fail git -C full-checkout show :folder1/ &&
test_must_fail git -C sparse-checkout show :folder1/ &&
git -C sparse-index show :folder1/ >actual &&
git -C full-checkout show HEAD:folder1 >expect &&
# The output of "git show" includes the way we referenced the
# objects, so strip that out.
test_line_count = 4 actual &&
tail -n 2 actual >actual-trunc &&
tail -n 2 expect >expect-trunc &&
test_cmp expect-trunc actual-trunc
test_must_fail git -C sparse-index show :folder1/ 2>err &&
grep "is in the index, but not at stage 0" err
'
test_expect_success 'submodule handling' '