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-rw-r--r--setup.c4
-rwxr-xr-xt/t0001-init.sh12
2 files changed, 15 insertions, 1 deletions
diff --git a/setup.c b/setup.c
index 53ffeabc5b..7da7aa8984 100644
--- a/setup.c
+++ b/setup.c
@@ -2517,7 +2517,9 @@ static void repository_format_configure(struct repository_format *repo_fmt,
int env_algo = hash_algo_by_name(env);
if (env_algo == GIT_HASH_UNKNOWN)
die(_("unknown hash algorithm '%s'"), env);
- repo_fmt->hash_algo = env_algo;
+ if (repo_fmt->version < 0 ||
+ repo_fmt->hash_algo == GIT_HASH_UNKNOWN)
+ repo_fmt->hash_algo = env_algo;
} else if (cfg.hash != GIT_HASH_UNKNOWN) {
repo_fmt->hash_algo = cfg.hash;
}
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index 6dff8b75f1..c49d9e0d38 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -586,6 +586,18 @@ test_expect_success 'GIT_DEFAULT_HASH overrides init.defaultObjectFormat' '
echo sha256 >expected
'
+for hash in sha1 sha256
+do
+ test_expect_success "reinit repository with GIT_DEFAULT_HASH=$hash does not change format" '
+ test_when_finished "rm -rf repo" &&
+ git init repo &&
+ git -C repo rev-parse --show-object-format >expect &&
+ GIT_DEFAULT_HASH=$hash git init repo &&
+ git -C repo rev-parse --show-object-format >actual &&
+ test_cmp expect actual
+ '
+done
+
test_expect_success 'extensions.objectFormat is not allowed with repo version 0' '
test_when_finished "rm -rf explicit-v0" &&
git init --object-format=sha256 explicit-v0 &&