[PATCH 1/6] read-cache: save trailing sha-1

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

This will be used as signature to know if the index has changed.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 cache.h      | 1 +
 read-cache.c | 7 ++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/cache.h b/cache.h
index ce377e1..7f7f306 100644
--- a/cache.h
+++ b/cache.h
@@ -279,6 +279,7 @@ struct index_state {
 		 initialized : 1;
 	struct hash_table name_hash;
 	struct hash_table dir_hash;
+	unsigned char sha1[20];
 };
 
 extern struct index_state the_index;
diff --git a/read-cache.c b/read-cache.c
index 33dd676..3b6daf1 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1269,10 +1269,11 @@ struct ondisk_cache_entry_extended {
 			    ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
 			    ondisk_cache_entry_size(ce_namelen(ce)))
 
-static int verify_hdr(struct cache_header *hdr, unsigned long size)
+static int verify_hdr(struct cache_header *hdr,
+		      unsigned long size,
+		      unsigned char *sha1)
 {
 	git_SHA_CTX c;
-	unsigned char sha1[20];
 	int hdr_version;
 
 	if (hdr->hdr_signature != htonl(CACHE_SIGNATURE))
@@ -1461,7 +1462,7 @@ int read_index_from(struct index_state *istate, const char *path)
 	close(fd);
 
 	hdr = mmap;
-	if (verify_hdr(hdr, mmap_size) < 0)
+	if (verify_hdr(hdr, mmap_size, istate->sha1) < 0)
 		goto unmap;
 
 	istate->version = ntohl(hdr->hdr_version);
-- 
1.8.5.2.240.g8478abd