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-rw-r--r--read-cache.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/read-cache.c b/read-cache.c
index 5d47ba8bdd..d8c657d6a7 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1506,6 +1506,9 @@ struct ondisk_cache_entry_extended {
ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
ondisk_cache_entry_size(ce_namelen(ce)))
+/* Allow fsck to force verification of the index checksum. */
+int verify_index_checksum;
+
static int verify_hdr(struct cache_header *hdr, unsigned long size)
{
git_SHA_CTX c;
@@ -1517,6 +1520,10 @@ static int verify_hdr(struct cache_header *hdr, unsigned long size)
hdr_version = ntohl(hdr->hdr_version);
if (hdr_version < INDEX_FORMAT_LB || INDEX_FORMAT_UB < hdr_version)
return error("bad index version %d", hdr_version);
+
+ if (!verify_index_checksum)
+ return 0;
+
git_SHA1_Init(&c);
git_SHA1_Update(&c, hdr, size - 20);
git_SHA1_Final(sha1, &c);