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

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

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.h b/setup.h
index 18dc3b7368..8522fa8575 100644
--- a/setup.h
+++ b/setup.h
@@ -149,7 +149,7 @@ struct repository_format {
 { \
 	.version = -1, \
 	.is_bare = -1, \
-	.hash_algo = GIT_HASH_SHA1, \
+	.hash_algo = GIT_HASH_DEFAULT, \
 	.ref_storage_format = REF_STORAGE_FORMAT_FILES, \
 	.unknown_extensions = STRING_LIST_INIT_DUP, \
 	.v1_only_extensions = STRING_LIST_INIT_DUP, \