[PATCH 5/5] cache: make oidcpy always copy GIT_MAX_RAWSZ bytes
- From
brian m. carlson <sandals@crustytoothpaste.net>
- Date
- Jan 10, 2019, 04:25 UTC
- Message-ID
- <20190110042551.915769-6-sandals@crustytoothpaste.net>
- In-Reply-To
- <20190110042551.915769-1-sandals@crustytoothpaste.net>
There are some situations in which we want to store an object ID into struct object_id without the_hash_algo necessarily being set correctly. One such case is when cloning a repository, where we must read refs from the remote side without having a repository from which to read the preferred algorithm.
In this cases, we may have the_hash_algo set to SHA-1, which is the default, but read refs into struct object_id that are SHA-256. When copying these values, we will want to copy them completely, not just the first 20 bytes. Consequently, make sure that oidcpy copies the maximum number of bytes at all times, regardless of the setting of the_hash_algo.
Since oidcpy and hashcpy are no longer functionally identical, remove the Cocinelle object_id transformations that convert from one into the other.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> --- cache.h | 2 +- contrib/coccinelle/object_id.cocci | 30 ------------------------------ 2 files changed, 1 insertion(+), 31 deletions(-)
diff --git a/cache.h b/cache.h index ca36b44ee0..8b8c6a1a2a 100644 --- a/cache.h +++ b/cache.h @@ -1072,7 +1072,7 @@ static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src) static inline void oidcpy(struct object_id *dst, const struct object_id *src) { - hashcpy(dst->hash, src->hash); + memcpy(dst->hash, src->hash, GIT_MAX_RAWSZ); } static inline struct object_id *oiddup(const struct object_id *src) diff --git a/contrib/coccinelle/object_id.cocci b/contrib/coccinelle/object_id.cocci index 6a7cf3e02d..3e536a9834 100644 --- a/contrib/coccinelle/object_id.cocci +++ b/contrib/coccinelle/object_id.cocci @@ -86,36 +86,6 @@ struct object_id OID; - hashcmp(OID.hash, OIDPTR->hash) + oidcmp(&OID, OIDPTR) -@@ -struct object_id OID1, OID2; -@@ -- hashcpy(OID1.hash, OID2.hash) -+ oidcpy(&OID1, &OID2) - -@@ -identifier f != oidcpy; -struct object_id *OIDPTR1; -struct object_id *OIDPTR2; -@@ - f(...) {<... -- hashcpy(OIDPTR1->hash, OIDPTR2->hash) -+ oidcpy(OIDPTR1, OIDPTR2) - ...>} - -@@ -struct object_id *OIDPTR; -struct object_id OID; -@@ -- hashcpy(OIDPTR->hash, OID.hash) -+ oidcpy(OIDPTR, &OID) - -@@ -struct object_id *OIDPTR; -struct object_id OID; -@@ -- hashcpy(OID.hash, OIDPTR->hash) -+ oidcpy(&OID, OIDPTR) - @@ struct object_id *OIDPTR1; struct object_id *OIDPTR2;