[PATCH v6 32/39] setup: add support for reading extensions.objectformat

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The transition plan specifies extensions.objectFormat as the indication
that we're using a given hash in a certain repo.  Read this as one of
the extensions we support.  If the user has specified an invalid value,
fail.

Ensure that we reject the extension if the repository format version is
0.

Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
 setup.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/setup.c b/setup.c
index 3a81307602..94e68bb4f4 100644
--- a/setup.c
+++ b/setup.c
@@ -470,7 +470,16 @@ static int check_repo_format(const char *var, const char *value, void *vdata)
 			data->partial_clone = xstrdup(value);
 		} else if (!strcmp(ext, "worktreeconfig"))
 			data->worktree_config = git_config_bool(var, value);
-		else
+		else if (!strcmp(ext, "objectformat")) {
+			int format;
+
+			if (!value)
+				return config_error_nonbool(var);
+			format = hash_algo_by_name(value);
+			if (format == GIT_HASH_UNKNOWN)
+				return error("invalid value for 'extensions.objectformat'");
+			data->hash_algo = format;
+		} else
 			string_list_append(&data->unknown_extensions, ext);
 	}
 
@@ -613,6 +622,11 @@ int verify_repository_format(const struct repository_format *format,
 		return -1;
 	}
 
+	if (format->version <= 0 && format->hash_algo != GIT_HASH_SHA1) {
+		strbuf_addstr(err, _("extensions.objectFormat is not valid in repo v0"));
+		return -1;
+	}
+
 	return 0;
 }
 



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