1 files changed, 126 insertions, 0 deletions
diff --git a/src/cli/common.c b/src/cli/common.c
new file mode 100644
index 0000000..60b0358
--- /dev/null
+++ b/src/cli/common.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include <git2.h>
+#include <git2/sys/config.h>
+
+#include "git2_util.h"
+#include "vector.h"
+
+#include "common.h"
+#include "error.h"
+
+static int parse_option(cli_opt *opt, void *data)
+{
+	git_str kv = GIT_STR_INIT, env = GIT_STR_INIT;
+	git_vector *cmdline_config = data;
+	int error = 0;
+
+	if (opt->spec && opt->spec->alias == 'c') {
+		if (git_str_puts(&kv, opt->value) < 0) {
+			error = cli_error_git();
+			goto done;
+		}
+	}
+
+	else if (opt->spec && !strcmp(opt->spec->name, "config-env")) {
+		char *val = strchr(opt->value, '=');
+
+		if (val == NULL || *(val + 1) == '\0') {
+			error = cli_error("invalid config format: '%s'", opt->value);
+			goto done;
+		}
+
+		if (git_str_put(&kv, opt->value, (val - opt->value)) < 0) {
+			error = cli_error_git();
+			goto done;
+		}
+
+		val++;
+
+		if ((error = git__getenv(&env, val)) == GIT_ENOTFOUND) {
+			error = cli_error("missing environment variable '%s' for configuration '%s'", val, kv.ptr);
+			goto done;
+		} else if (error) {
+			error = cli_error_git();
+			goto done;
+		}
+
+		if (git_str_putc(&kv, '=') < 0 ||
+		    git_str_puts(&kv, env.ptr) < 0) {
+			error = cli_error_git();
+			goto done;
+		}
+	}
+
+	if (kv.size > 0 &&
+	    git_vector_insert(cmdline_config, git_str_detach(&kv)) < 0)
+		error = cli_error_git();
+
+done:
+	git_str_dispose(&env);
+	git_str_dispose(&kv);
+	return error;
+}
+
+static int parse_common_options(
+	git_repository *repo,
+	cli_repository_open_options *opts)
+{
+	cli_opt_spec common_opts[] = {
+		{ CLI_COMMON_OPT_CONFIG },
+		{ CLI_COMMON_OPT_CONFIG_ENV },
+		{ 0 }
+	};
+	git_config_backend_memory_options config_opts =
+		GIT_CONFIG_BACKEND_MEMORY_OPTIONS_INIT;
+	git_vector cmdline = GIT_VECTOR_INIT;
+	git_config *config = NULL;
+	git_config_backend *backend = NULL;
+	int error = 0;
+
+	config_opts.backend_type = "command line";
+
+	if ((error = cli_opt_foreach(common_opts, opts->args,
+			opts->args_len, CLI_OPT_PARSE_GNU, parse_option,
+			&cmdline)) < 0)
+		goto done;
+
+	if (git_vector_length(&cmdline) == 0)
+		goto done;
+
+	if (git_repository_config(&config, repo) < 0 ||
+	    git_config_backend_from_values(&backend,
+			(const char **)cmdline.contents, cmdline.length,
+			&config_opts) < 0 ||
+	    git_config_add_backend(config, backend, GIT_CONFIG_LEVEL_APP,
+			repo, 0) < 0)
+		error = cli_error_git();
+
+done:
+	if (error && backend)
+		backend->free(backend);
+	git_config_free(config);
+	git_vector_free_deep(&cmdline);
+	return error;
+}
+
+int cli_repository_open(
+	git_repository **out,
+	cli_repository_open_options *opts)
+{
+	git_repository *repo;
+
+	if (git_repository_open_ext(&repo, ".", GIT_REPOSITORY_OPEN_FROM_ENV, NULL) < 0)
+		return -1;
+
+	if (opts && parse_common_options(repo, opts) < 0)
+		return -1;
+
+	*out = repo;
+	return 0;
+}