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[05/32] repository: add a compatibility hash algorithm

Message ID 20230908231049.2035003-5-ebiederm@xmission.com (mailing list archive)
State New, archived
Headers show
Series SHA256 and SHA1 interoperability | expand

Commit Message

Eric W. Biederman Sept. 8, 2023, 11:10 p.m. UTC 
We currently have support for using a full stage 4 SHA-256
implementation.  However, we'd like to support interoperability with
SHA-1 repositories as well.  The transition plan anticipates a
compatibility hash algorithm configuration option that we can use to
implement support for this.  Let's add an element to the repository
structure that indicates the compatibility hash algorithm so we can use
it when we need to consider interoperability between algorithms.

For now, we always set it to NULL, but we'll initialize it differently
in the future.

Inspired-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 repository.h | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/repository.h b/repository.h
index 5f18486f6465..6c4130f0c36e 100644
--- a/repository.h
+++ b/repository.h
@@ -160,6 +160,9 @@  struct repository {
 	/* Repository's current hash algorithm, as serialized on disk. */
 	const struct git_hash_algo *hash_algo;
 
+	/* Repository's compatibility hash algorithm. */
+	const struct git_hash_algo *compat_hash_algo;
+
 	/* A unique-id for tracing purposes. */
 	int trace2_repo_id;