[PATCH 10/27] submodule: sparse-index should not collapse links

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <dstolee@microsoft.com>

A submodule is stored as a "Git link" that actually points to a commit
within a submodule. Submodules are populated or not depending on
submodule configuration, not sparse-checkout. To ensure that the
sparse-index feature integrates correctly with submodules, we should not
collapse a directory if there is a Git link within its range.

This allows us to remove ensure_full_index() from
die_path_inside_submodule() because a sparse-index will not remove the
entries for Git links. The loop already 'continue's if the cache entry
is not a Git link.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 sparse-index.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sparse-index.c b/sparse-index.c
index d8f1a5a13d7..5dd0b835b9d 100644
--- a/sparse-index.c
+++ b/sparse-index.c
@@ -52,6 +52,7 @@ static int convert_to_sparse_rec(struct index_state *istate,
 		struct cache_entry *ce = istate->cache[i];
 
 		if (ce_stage(ce) ||
+		    S_ISGITLINK(ce->ce_mode) ||
 		    !(ce->ce_flags & CE_SKIP_WORKTREE))
 			can_convert = 0;
 	}
-- 
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