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loose: add a mapping between SHA-1 and SHA-256 for loose objects

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As part of the transition plan, we'd like to add a file in the .git
directory that maps loose objects between SHA-1 and SHA-256.  Let's
implement the specification in the transition plan and store this data
on a per-repository basis in struct repository.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2023-10-01 21:40:09 -05:00
committed by Junio C Hamano
parent 15a1ca1abe
commit 23b2c7e95b
7 changed files with 293 additions and 1 deletions
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6
repository.c
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@@ -14,6 +14,7 @@
#include "read-cache-ll.h"
#include "remote.h"
#include "setup.h"
#include "loose.h"
#include "submodule-config.h"
#include "sparse-index.h"
#include "trace2.h"
@@ -109,6 +110,8 @@ void repo_set_compat_hash_algo(struct repository *repo, int algo)
if (hash_algo_by_ptr(repo->hash_algo) == algo)
BUG("hash_algo and compat_hash_algo match");
repo->compat_hash_algo = algo ? &hash_algos[algo] : NULL;
if (repo->compat_hash_algo)
repo_read_loose_object_map(repo);
}
/*
@@ -201,6 +204,9 @@ int repo_init(struct repository *repo,
if (worktree)
repo_set_worktree(repo, worktree);
if (repo->compat_hash_algo)
repo_read_loose_object_map(repo);
clear_repository_format(&format);
return 0;