[PATCH 3/3] split-index: it really is incompatible with the sparse index

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

... at least for now. So let's error out if we are even trying to
initialize the split index when the index is sparse, or when trying to
write the split index extension for a sparse index.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 read-cache.c  | 3 +++
 split-index.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/read-cache.c b/read-cache.c
index cbe73f14e5e..a932e01fc7a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -3009,6 +3009,9 @@ static int do_write_index(struct index_state *istate, struct tempfile *tempfile,
 	    !is_null_oid(&istate->split_index->base_oid)) {
 		struct strbuf sb = STRBUF_INIT;
 
+		if (istate->sparse_index)
+			die(_("cannot write split index for a sparse index"));
+
 		err = write_link_extension(&sb, istate) < 0 ||
 			write_index_ext_header(f, eoie_c, CACHE_EXT_LINK,
 					       sb.len) < 0;
diff --git a/split-index.c b/split-index.c
index 8e52e891c3b..9d0ccc30d00 100644
--- a/split-index.c
+++ b/split-index.c
@@ -5,6 +5,9 @@
 struct split_index *init_split_index(struct index_state *istate)
 {
 	if (!istate->split_index) {
+		if (istate->sparse_index)
+			die(_("cannot use split index with a sparse index"));
+
 		CALLOC_ARRAY(istate->split_index, 1);
 		istate->split_index->refcount = 1;
 	}
-- 
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