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hash: add a constant for the default hash algorithm

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Right now, SHA-1 is the default hash algorithm in Git.  However, this
may change in the future.

We have many places in our code that use the SHA-1 constant to indicate
the default hash if none is specified, but it will end up being more
practical to specify this explicitly and clearly using a constant for
whatever the default hash algorithm is.  Then, if we decide to change it
in the future, we can simply replace the constant representing the
default with a new value.

For these reasons, introduce GIT_HASH_DEFAULT to represent the default
hash algorithm.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2025-07-01 21:22:27 +00:00
committed by Junio C Hamano
parent 16bd9f20a4
commit ca6daa1368
1 changed files with 2 additions and 0 deletions
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2
hash.h
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@@ -174,6 +174,8 @@ static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *s
#define GIT_HASH_SHA256 2
/* Number of algorithms supported (including unknown). */
#define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1)
/* Default hash algorithm if unspecified. */
#define GIT_HASH_DEFAULT GIT_HASH_SHA1
/* "sha1", big-endian */
#define GIT_SHA1_FORMAT_ID 0x73686131