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Merge branch 'bc/use-sha256-by-default-in-3.0'

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Prepare to flip the default hash function to SHA-256.

* bc/use-sha256-by-default-in-3.0:
  Enable SHA-256 by default in breaking changes mode
  help: add a build option for default hash
  t5300: choose the built-in hash outside of a repo
  t4042: choose the built-in hash outside of a repo
  t1007: choose the built-in hash outside of a repo
  t: default to compile-time default hash if not set
  setup: use the default algorithm to initialize repo format
  Use legacy hash for legacy formats
  builtin: use default hash when outside a repository
  hash: add a constant for the legacy hash algorithm
  hash: add a constant for the default hash algorithm
This commit is contained in:
Junio C Hamano
2025-07-21 09:14:25 -07:00
parent 90c0775e97 c79bb70a2e
commit a636d395ff
25 changed files with 62 additions and 32 deletions
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10
hash.h
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@@ -175,6 +175,16 @@ static inline void git_SHA256_Clone(git_SHA256_CTX *dst, const git_SHA256_CTX *s
/* Number of algorithms supported (including unknown). */
#define GIT_HASH_NALGOS (GIT_HASH_SHA256 + 1)
/* Default hash algorithm if unspecified. */
#ifdef WITH_BREAKING_CHANGES
# define GIT_HASH_DEFAULT GIT_HASH_SHA256
#else
# define GIT_HASH_DEFAULT GIT_HASH_SHA1
#endif
/* Legacy hash algorithm. Implied for older data formats which don't specify. */
#define GIT_HASH_SHA1_LEGACY GIT_HASH_SHA1
/* "sha1", big-endian */
#define GIT_SHA1_FORMAT_ID 0x73686131