[PATCH] Check order when reading index

[Jaime Soriano Pastor <jsorianopastor@gmail.com>]

Signed-off-by: Jaime Soriano Pastor <jsorianopastor@gmail.com>
---
 read-cache.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/read-cache.c b/read-cache.c
index 7f5645e..e117d3a 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1438,6 +1438,21 @@ static struct cache_entry *create_from_disk(struct ondisk_cache_entry *ondisk,
 	return ce;
 }
 
+void check_next_ce(struct cache_entry *ce, struct cache_entry *next_ce) {
+	if (!ce || !next_ce)
+		return;
+	if (cache_name_compare(ce->name, ce_namelen(ce),
+						   next_ce->name, ce_namelen(next_ce)) > 1)
+		die("Unordered stage entries in index");
+	if (ce_same_name(ce, next_ce)) {
+		if (!ce_stage(ce))
+			die("Multiple stage entries for merged file '%s'",
+				ce->name);
+		if (ce_stage(ce) >= ce_stage(next_ce))
+			die("Unordered stage entries for '%s'", ce->name);
+	}
+}
+
 /* remember to discard_cache() before reading a different cache! */
 int read_index_from(struct index_state *istate, const char *path)
 {
@@ -1499,6 +1514,9 @@ int read_index_from(struct index_state *istate, const char *path)
 		ce = create_from_disk(disk_ce, &consumed, previous_name);
 		set_index_entry(istate, i, ce);
 
+		if (i > 0)
+			check_next_ce(istate->cache[i-1], ce);
+
 		src_offset += consumed;
 	}
 	strbuf_release(&previous_name_buf);
-- 
2.0.4.dirty