1 files changed, 74 insertions, 27 deletions
diff --git a/setup.c b/setup.c
index 5f81d9fac0..2e11542a1f 100644
--- a/setup.c
+++ b/setup.c
@@ -2320,14 +2320,67 @@ static void separate_git_dir(const char *git_dir, const char *git_link)
 	write_file(git_link, "gitdir: %s", git_dir);
 }
 
-static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash)
+struct default_format_config {
+	int hash;
+	enum ref_storage_format ref_format;
+};
+
+static int read_default_format_config(const char *key, const char *value,
+				      const struct config_context *ctx UNUSED,
+				      void *payload)
 {
-	const char *env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
+	struct default_format_config *cfg = payload;
+	char *str = NULL;
+	int ret;
+
+	if (!strcmp(key, "init.defaultobjectformat")) {
+		ret = git_config_string(&str, key, value);
+		if (ret)
+			goto out;
+		cfg->hash = hash_algo_by_name(str);
+		if (cfg->hash == GIT_HASH_UNKNOWN)
+			warning(_("unknown hash algorithm '%s'"), str);
+		goto out;
+	}
+
+	if (!strcmp(key, "init.defaultrefformat")) {
+		ret = git_config_string(&str, key, value);
+		if (ret)
+			goto out;
+		cfg->ref_format = ref_storage_format_by_name(str);
+		if (cfg->ref_format == REF_STORAGE_FORMAT_UNKNOWN)
+			warning(_("unknown ref storage format '%s'"), str);
+		goto out;
+	}
+
+	ret = 0;
+out:
+	free(str);
+	return ret;
+}
+
+static void repository_format_configure(struct repository_format *repo_fmt,
+					int hash, enum ref_storage_format ref_format)
+{
+	struct default_format_config cfg = {
+		.hash = GIT_HASH_UNKNOWN,
+		.ref_format = REF_STORAGE_FORMAT_UNKNOWN,
+	};
+	struct config_options opts = {
+		.respect_includes = 1,
+		.ignore_repo = 1,
+		.ignore_worktree = 1,
+	};
+	const char *env;
+
+	config_with_options(read_default_format_config, &cfg, NULL, NULL, &opts);
+
 	/*
 	 * If we already have an initialized repo, don't allow the user to
 	 * specify a different algorithm, as that could cause corruption.
 	 * Otherwise, if the user has specified one on the command line, use it.
 	 */
+	env = getenv(GIT_DEFAULT_HASH_ENVIRONMENT);
 	if (repo_fmt->version >= 0 && hash != GIT_HASH_UNKNOWN && hash != repo_fmt->hash_algo)
 		die(_("attempt to reinitialize repository with different hash"));
 	else if (hash != GIT_HASH_UNKNOWN)
@@ -2337,26 +2390,27 @@ static void validate_hash_algorithm(struct repository_format *repo_fmt, int hash
 		if (env_algo == GIT_HASH_UNKNOWN)
 			die(_("unknown hash algorithm '%s'"), env);
 		repo_fmt->hash_algo = env_algo;
+	} else if (cfg.hash != GIT_HASH_UNKNOWN) {
+		repo_fmt->hash_algo = cfg.hash;
 	}
-}
-
-static void validate_ref_storage_format(struct repository_format *repo_fmt,
-					enum ref_storage_format format)
-{
-	const char *name = getenv("GIT_DEFAULT_REF_FORMAT");
+	repo_set_hash_algo(the_repository, repo_fmt->hash_algo);
 
+	env = getenv("GIT_DEFAULT_REF_FORMAT");
 	if (repo_fmt->version >= 0 &&
-	    format != REF_STORAGE_FORMAT_UNKNOWN &&
-	    format != repo_fmt->ref_storage_format) {
+	    ref_format != REF_STORAGE_FORMAT_UNKNOWN &&
+	    ref_format != repo_fmt->ref_storage_format) {
 		die(_("attempt to reinitialize repository with different reference storage format"));
-	} else if (format != REF_STORAGE_FORMAT_UNKNOWN) {
-		repo_fmt->ref_storage_format = format;
-	} else if (name) {
-		format = ref_storage_format_by_name(name);
-		if (format == REF_STORAGE_FORMAT_UNKNOWN)
-			die(_("unknown ref storage format '%s'"), name);
-		repo_fmt->ref_storage_format = format;
+	} else if (ref_format != REF_STORAGE_FORMAT_UNKNOWN) {
+		repo_fmt->ref_storage_format = ref_format;
+	} else if (env) {
+		ref_format = ref_storage_format_by_name(env);
+		if (ref_format == REF_STORAGE_FORMAT_UNKNOWN)
+			die(_("unknown ref storage format '%s'"), env);
+		repo_fmt->ref_storage_format = ref_format;
+	} else if (cfg.ref_format != REF_STORAGE_FORMAT_UNKNOWN) {
+		repo_fmt->ref_storage_format = cfg.ref_format;
 	}
+	repo_set_ref_storage_format(the_repository, repo_fmt->ref_storage_format);
 }
 
 int init_db(const char *git_dir, const char *real_git_dir,
@@ -2389,22 +2443,15 @@ int init_db(const char *git_dir, const char *real_git_dir,
 	}
 	startup_info->have_repository = 1;
 
-	/* Check to see if the repository version is right.
+	/*
+	 * Check to see if the repository version is right.
 	 * Note that a newly created repository does not have
 	 * config file, so this will not fail.  What we are catching
 	 * is an attempt to reinitialize new repository with an old tool.
 	 */
 	check_repository_format(&repo_fmt);
 
-	validate_hash_algorithm(&repo_fmt, hash);
-	validate_ref_storage_format(&repo_fmt, ref_storage_format);
-
-	/*
-	 * Now that we have set up both the hash algorithm and the ref storage
-	 * format we can update the repository's settings accordingly.
-	 */
-	repo_set_hash_algo(the_repository, repo_fmt.hash_algo);
-	repo_set_ref_storage_format(the_repository, repo_fmt.ref_storage_format);
+	repository_format_configure(&repo_fmt, hash, ref_storage_format);
 
 	/*
 	 * Ensure `core.hidedotfiles` is processed. This must happen after we