22 files changed, 721 insertions, 74 deletions

diff --git a/src/cli/CMakeLists.txt b/src/cli/CMakeLists.txt
index 84b6c19..97797e3 100644
--- a/src/cli/CMakeLists.txt
+++ b/src/cli/CMakeLists.txt
@@ -4,7 +4,8 @@ set(CLI_INCLUDES
 	"${libgit2_SOURCE_DIR}/src/util"
 	"${libgit2_SOURCE_DIR}/src/cli"
 	"${libgit2_SOURCE_DIR}/include"
-	"${LIBGIT2_DEPENDENCY_INCLUDES}")
+	"${LIBGIT2_DEPENDENCY_INCLUDES}"
+	"${LIBGIT2_SYSTEM_INCLUDES}")
 
 if(WIN32 AND NOT CYGWIN)
 	file(GLOB CLI_SRC_OS win32/*.c)
diff --git a/src/cli/cli.h b/src/cli/cli.h
deleted file mode 100644
index 7dede67..0000000
--- a/src/cli/cli.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * 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.
- */
-
-#ifndef CLI_cli_h__
-#define CLI_cli_h__
-
-#define PROGRAM_NAME "git2"
-
-#include "git2_util.h"
-
-#include "error.h"
-#include "opt.h"
-#include "opt_usage.h"
-#include "sighandler.h"
-
-#endif /* CLI_cli_h__ */
diff --git a/src/cli/cmd.c b/src/cli/cmd.c
index 2a7e71c..0b1fafb 100644
--- a/src/cli/cmd.c
+++ b/src/cli/cmd.c
@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "cli.h"
+#include "common.h"
 #include "cmd.h"
 
 const cli_cmd_spec *cli_cmd_spec_byname(const char *name)
diff --git a/src/cli/cmd.h b/src/cli/cmd.h
index 8b1a1b3..bd88122 100644
--- a/src/cli/cmd.h
+++ b/src/cli/cmd.h
@@ -27,7 +27,9 @@ extern const cli_cmd_spec *cli_cmd_spec_byname(const char *name);
 /* Commands */
 extern int cmd_cat_file(int argc, char **argv);
 extern int cmd_clone(int argc, char **argv);
+extern int cmd_config(int argc, char **argv);
 extern int cmd_hash_object(int argc, char **argv);
 extern int cmd_help(int argc, char **argv);
+extern int cmd_index_pack(int argc, char **argv);
 
 #endif /* CLI_cmd_h__ */
diff --git a/src/cli/cmd_cat_file.c b/src/cli/cmd_cat_file.c
index fb53a72..90ee603 100644
--- a/src/cli/cmd_cat_file.c
+++ b/src/cli/cmd_cat_file.c
@@ -6,7 +6,7 @@
  */
 
 #include <git2.h>
-#include "cli.h"
+#include "common.h"
 #include "cmd.h"
 
 #define COMMAND_NAME "cat-file"
@@ -24,9 +24,7 @@ static int display = DISPLAY_CONTENT;
 static char *type_name, *object_spec;
 
 static const cli_opt_spec opts[] = {
-	{ CLI_OPT_TYPE_SWITCH,    "help",    0, &show_help,   1,
-	  CLI_OPT_USAGE_HIDDEN | CLI_OPT_USAGE_STOP_PARSING, NULL,
-	  "display help about the " COMMAND_NAME " command" },
+	CLI_COMMON_OPT,
 
 	{ CLI_OPT_TYPE_SWITCH,     NULL,    't', &display,    DISPLAY_TYPE,
 	  CLI_OPT_USAGE_REQUIRED,  NULL,    "display the type of the object" },
@@ -139,6 +137,7 @@ static int print_pretty(git_object *object)
 
 int cmd_cat_file(int argc, char **argv)
 {
+	cli_repository_open_options open_opts = { argv + 1, argc - 1};
 	git_repository *repo = NULL;
 	git_object *object = NULL;
 	git_object_t type;
@@ -153,7 +152,7 @@ int cmd_cat_file(int argc, char **argv)
 		return 0;
 	}
 
-	if (git_repository_open_ext(&repo, ".", GIT_REPOSITORY_OPEN_FROM_ENV, NULL) < 0)
+	if (cli_repository_open(&repo, &open_opts) < 0)
 		return cli_error_git();
 
 	if ((giterr = git_revparse_single(&object, repo, object_spec)) < 0) {
diff --git a/src/cli/cmd_clone.c b/src/cli/cmd_clone.c
index e477625..7d9736f 100644
--- a/src/cli/cmd_clone.c
+++ b/src/cli/cmd_clone.c
@@ -7,7 +7,7 @@
 
 #include <stdio.h>
 #include <git2.h>
-#include "cli.h"
+#include "common.h"
 #include "cmd.h"
 #include "error.h"
 #include "sighandler.h"
@@ -24,9 +24,7 @@ static bool local_path_exists;
 static cli_progress progress = CLI_PROGRESS_INIT;
 
 static const cli_opt_spec opts[] = {
-	{ CLI_OPT_TYPE_SWITCH,    "help",         0,  &show_help,   1,
-	  CLI_OPT_USAGE_HIDDEN | CLI_OPT_USAGE_STOP_PARSING, NULL,
-	  "display help about the " COMMAND_NAME " command" },
+	CLI_COMMON_OPT,
 
 	{ CLI_OPT_TYPE_SWITCH,    "quiet",       'q', &quiet,       1,
 	  CLI_OPT_USAGE_DEFAULT,   NULL,         "display the type of the object" },
diff --git a/src/cli/cmd_config.c b/src/cli/cmd_config.c
new file mode 100644
index 0000000..6b9d373
--- /dev/null
+++ b/src/cli/cmd_config.c
@@ -0,0 +1,242 @@
+/*
+ * 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 "common.h"
+#include "cmd.h"
+
+#define COMMAND_NAME "config"
+
+typedef enum {
+	ACTION_NONE = 0,
+	ACTION_GET,
+	ACTION_ADD,
+	ACTION_REPLACE_ALL,
+	ACTION_LIST
+} action_t;
+
+static action_t action = ACTION_NONE;
+static int show_origin;
+static int show_scope;
+static int show_help;
+static int null_separator;
+static int config_level;
+static char *config_filename;
+static char *name, *value, *value_pattern;
+
+static const cli_opt_spec opts[] = {
+	CLI_COMMON_OPT, \
+
+	{ CLI_OPT_TYPE_SWITCH,    "null",       'z', &null_separator, 1,
+	  0,                       NULL,        "use NUL as a separator" },
+
+	{ CLI_OPT_TYPE_SWITCH,    "system",      0,  &config_level, GIT_CONFIG_LEVEL_SYSTEM,
+	  0,                       NULL,        "read/write to system configuration" },
+	{ CLI_OPT_TYPE_SWITCH,    "global",      0,  &config_level, GIT_CONFIG_LEVEL_GLOBAL,
+	  CLI_OPT_USAGE_CHOICE,    NULL,        "read/write to global configuration" },
+	{ CLI_OPT_TYPE_SWITCH,    "local",       0,  &config_level, GIT_CONFIG_LEVEL_LOCAL,
+	  CLI_OPT_USAGE_CHOICE,    NULL,        "read/write to local configuration" },
+	{ CLI_OPT_TYPE_VALUE,     "file",        0,  &config_filename, 0,
+	  CLI_OPT_USAGE_CHOICE,   "filename",   "read/write to specified configuration file" },
+
+	{ CLI_OPT_TYPE_SWITCH,    "get",         0,  &action,       ACTION_GET,
+	  CLI_OPT_USAGE_REQUIRED,  NULL,        "get a configuration value" },
+	{ CLI_OPT_TYPE_SWITCH,    "add",         0,  &action,       ACTION_ADD,
+	  CLI_OPT_USAGE_CHOICE,    NULL,        "add a configuration value" },
+	{ CLI_OPT_TYPE_SWITCH,    "replace-all", 0,  &action,       ACTION_REPLACE_ALL,
+	  CLI_OPT_USAGE_CHOICE,    NULL,        "add a configuration value, replacing any old values" },
+	{ CLI_OPT_TYPE_SWITCH,    "list",       'l', &action,       ACTION_LIST,
+	  CLI_OPT_USAGE_CHOICE | CLI_OPT_USAGE_SHOW_LONG,
+	                           NULL,        "list all configuration entries" },
+	{ CLI_OPT_TYPE_SWITCH,    "show-origin", 0,  &show_origin,  1,
+	  0,                       NULL,        "show origin of configuration" },
+	{ CLI_OPT_TYPE_SWITCH,    "show-scope",  0,  &show_scope,   1,
+	  0,                       NULL,        "show scope of configuration" },
+	{ CLI_OPT_TYPE_ARG,       "name",        0,  &name,         0,
+	  0,                      "name",       "name of configuration entry" },
+	{ CLI_OPT_TYPE_ARG,       "value",       0,  &value,        0,
+	  0,                      "value",      "value of configuration entry" },
+	{ CLI_OPT_TYPE_ARG,       "regexp",      0,  &value_pattern, 0,
+	  0,                      "regexp",     "regular expression of values to replace" },
+	{ 0 },
+};
+
+static void print_help(void)
+{
+	cli_opt_usage_fprint(stdout, PROGRAM_NAME, COMMAND_NAME, opts);
+	printf("\n");
+
+	printf("Query and set configuration options.\n");
+	printf("\n");
+
+	printf("Options:\n");
+
+	cli_opt_help_fprint(stdout, opts);
+}
+
+static int get_config(git_config *config)
+{
+	git_buf value = GIT_BUF_INIT;
+	char sep = null_separator ? '\0' : '\n';
+	int error;
+
+	error = git_config_get_string_buf(&value, config, name);
+
+	if (error && error != GIT_ENOTFOUND)
+		return cli_error_git();
+
+	else if (error == GIT_ENOTFOUND)
+		return 1;
+
+	printf("%s%c", value.ptr, sep);
+	return 0;
+}
+
+static int add_config(git_config *config)
+{
+	if (git_config_set_multivar(config, name, "$^", value) < 0)
+		return cli_error_git();
+
+	return 0;
+}
+
+static int replace_all_config(git_config *config)
+{
+	if (git_config_set_multivar(config, name, value_pattern ? value_pattern : ".*", value) < 0)
+		return cli_error_git();
+
+	return 0;
+}
+
+static const char *level_name(git_config_level_t level)
+{
+	switch (level) {
+	case GIT_CONFIG_LEVEL_PROGRAMDATA:
+		return "programdata";
+	case GIT_CONFIG_LEVEL_SYSTEM:
+		return "system";
+	case GIT_CONFIG_LEVEL_XDG:
+		return "global";
+	case GIT_CONFIG_LEVEL_GLOBAL:
+		return "global";
+	case GIT_CONFIG_LEVEL_LOCAL:
+		return "local";
+	case GIT_CONFIG_LEVEL_APP:
+		return "command";
+	default:
+		return "unknown";
+	}
+}
+
+static int list_config(git_config *config)
+{
+	git_config_iterator *iterator;
+	git_config_entry *entry;
+	char data_separator = null_separator ? '\0' : '\t';
+	char kv_separator = null_separator ? '\n' : '=';
+	char entry_separator = null_separator ? '\0' : '\n';
+	int error;
+
+	if (git_config_iterator_new(&iterator, config) < 0)
+		return cli_error_git();
+
+	while ((error = git_config_next(&entry, iterator)) == 0) {
+		if (show_scope)
+			printf("%s%c",
+				level_name(entry->level),
+				data_separator);
+
+		if (show_origin)
+			printf("%s%s%s%c",
+				entry->backend_type ? entry->backend_type : "",
+				entry->backend_type && entry->origin_path ? ":" : "",
+				entry->origin_path ? entry->origin_path : "",
+				data_separator);
+
+		printf("%s%c%s%c", entry->name, kv_separator, entry->value,
+			entry_separator);
+	}
+
+	if (error != GIT_ITEROVER)
+		return cli_error_git();
+
+	git_config_iterator_free(iterator);
+	return 0;
+}
+
+int cmd_config(int argc, char **argv)
+{
+	git_repository *repo = NULL;
+	git_config *config = NULL;
+	cli_repository_open_options open_opts = { argv + 1, argc - 1};
+	cli_opt invalid_opt;
+	int ret = 0;
+
+	if (cli_opt_parse(&invalid_opt, opts, argv + 1, argc - 1, CLI_OPT_PARSE_GNU))
+		return cli_opt_usage_error(COMMAND_NAME, opts, &invalid_opt);
+
+	if (show_help) {
+		print_help();
+		return 0;
+	}
+
+	if (config_filename) {
+		if (git_config_new(&config) < 0 ||
+		    git_config_add_file_ondisk(config, config_filename,
+				GIT_CONFIG_LEVEL_APP, NULL, 0) < 0) {
+			ret = cli_error_git();
+			goto done;
+		}
+	} else {
+		if (cli_repository_open(&repo, &open_opts) < 0 ||
+		    git_repository_config(&config, repo) < 0) {
+			ret = cli_error_git();
+			goto done;
+		}
+
+		if (config_level &&
+		    git_config_open_level(&config, config, config_level) < 0) {
+			ret = cli_error_git();
+			goto done;
+		}
+	}
+
+	switch (action) {
+	case ACTION_ADD:
+		if (!name || !value || value_pattern)
+			ret = cli_error_usage("%s --add requires two arguments", COMMAND_NAME);
+		else
+			ret = add_config(config);
+		break;
+	case ACTION_REPLACE_ALL:
+		if (!name || !value)
+			ret = cli_error_usage("%s --replace-all requires two or three arguments", COMMAND_NAME);
+		else
+			ret = replace_all_config(config);
+		break;
+	case ACTION_GET:
+		if (!name)
+			ret = cli_error_usage("%s --get requires an argument", COMMAND_NAME);
+		else
+			ret = get_config(config);
+		break;
+	case ACTION_LIST:
+		if (name)
+			ret = cli_error_usage("%s --list does not take an argument", COMMAND_NAME);
+		else
+			ret = list_config(config);
+		break;
+	default:
+		ret = cli_error_usage("unknown action");
+	}
+
+done:
+	git_config_free(config);
+	git_repository_free(repo);
+	return ret;
+}
diff --git a/src/cli/cmd_hash_object.c b/src/cli/cmd_hash_object.c
index 93b980d..741debb 100644
--- a/src/cli/cmd_hash_object.c
+++ b/src/cli/cmd_hash_object.c
@@ -6,7 +6,7 @@
  */
 
 #include <git2.h>
-#include "cli.h"
+#include "common.h"
 #include "cmd.h"
 
 #include "futils.h"
@@ -19,9 +19,7 @@ static int write_object, read_stdin, literally;
 static char **filenames;
 
 static const cli_opt_spec opts[] = {
-	{ CLI_OPT_TYPE_SWITCH,   "help",      0, &show_help,    1,
-	  CLI_OPT_USAGE_HIDDEN | CLI_OPT_USAGE_STOP_PARSING, NULL,
-	  "display help about the " COMMAND_NAME " command" },
+	CLI_COMMON_OPT,
 
 	{ CLI_OPT_TYPE_VALUE,     NULL,      't', &type_name,    0,
 	  CLI_OPT_USAGE_DEFAULT, "type",     "the type of object to hash (default: \"blob\")" },
@@ -92,6 +90,7 @@ static int hash_buf(
 
 int cmd_hash_object(int argc, char **argv)
 {
+	cli_repository_open_options open_opts = { argv + 1, argc - 1};
 	git_repository *repo = NULL;
 	git_odb *odb = NULL;
 	git_oid_t oid_type;
@@ -113,7 +112,7 @@ int cmd_hash_object(int argc, char **argv)
 		return cli_error_usage("invalid object type '%s'", type_name);
 
 	if (write_object &&
-	    (git_repository_open_ext(&repo, ".", GIT_REPOSITORY_OPEN_FROM_ENV, NULL) < 0 ||
+	    (cli_repository_open(&repo, &open_opts) < 0 ||
 	     git_repository_odb(&odb, repo) < 0)) {
 		ret = cli_error_git();
 		goto done;
diff --git a/src/cli/cmd_help.c b/src/cli/cmd_help.c
index 7ee9822..5e877e0 100644
--- a/src/cli/cmd_help.c
+++ b/src/cli/cmd_help.c
@@ -7,7 +7,7 @@
 
 #include <stdio.h>
 #include <git2.h>
-#include "cli.h"
+#include "common.h"
 #include "cmd.h"
 
 #define COMMAND_NAME "help"
@@ -16,8 +16,8 @@ static char *command;
 static int show_help;
 
 static const cli_opt_spec opts[] = {
-	{ CLI_OPT_TYPE_SWITCH,   "help",     0, &show_help, 1,
-	  CLI_OPT_USAGE_HIDDEN,   NULL,     "display help about the help command" },
+	CLI_COMMON_OPT,
+
 	{ CLI_OPT_TYPE_ARG,      "command",  0, &command,   0,
 	  CLI_OPT_USAGE_DEFAULT, "command", "the command to show help for" },
 	{ 0 },
diff --git a/src/cli/cmd_index_pack.c b/src/cli/cmd_index_pack.c
new file mode 100644
index 0000000..09685c5
--- /dev/null
+++ b/src/cli/cmd_index_pack.c
@@ -0,0 +1,114 @@
+/*
+ * 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 "common.h"
+#include "cmd.h"
+#include "progress.h"
+
+#define COMMAND_NAME "index-pack"
+
+#define BUFFER_SIZE (1024 * 1024)
+
+static int show_help, verbose, read_stdin;
+static char *filename;
+static cli_progress progress = CLI_PROGRESS_INIT;
+
+static const cli_opt_spec opts[] = {
+	{ CLI_OPT_TYPE_SWITCH,    "help",     0, &show_help,   1,
+	  CLI_OPT_USAGE_HIDDEN | CLI_OPT_USAGE_STOP_PARSING, NULL,
+	  "display help about the " COMMAND_NAME " command" },
+
+	{ CLI_OPT_TYPE_SWITCH,    "verbose", 'v', &verbose,    1,
+	  CLI_OPT_USAGE_DEFAULT,   NULL,    "display progress output" },
+
+	{ CLI_OPT_TYPE_LITERAL },
+
+	{ CLI_OPT_TYPE_SWITCH,    "stdin",    0,   &read_stdin, 1,
+	  CLI_OPT_USAGE_REQUIRED,  NULL,     "read from stdin" },
+	{ CLI_OPT_TYPE_ARG,       "pack-file", 0,  &filename, 0,
+	  CLI_OPT_USAGE_CHOICE,   "pack-file", "packfile path" },
+
+	{ 0 },
+};
+
+static void print_help(void)
+{
+	cli_opt_usage_fprint(stdout, PROGRAM_NAME, COMMAND_NAME, opts);
+	printf("\n");
+
+	printf("Indexes a packfile and writes the index to disk.\n");
+	printf("\n");
+
+	printf("Options:\n");
+
+	cli_opt_help_fprint(stdout, opts);
+}
+
+int cmd_index_pack(int argc, char **argv)
+{
+	cli_opt invalid_opt;
+	git_indexer *idx = NULL;
+	git_indexer_options idx_opts = GIT_INDEXER_OPTIONS_INIT;
+	git_indexer_progress stats = {0};
+	char buf[BUFFER_SIZE];
+	ssize_t read_len;
+	int fd, ret;
+
+	if (cli_opt_parse(&invalid_opt, opts, argv + 1, argc - 1, CLI_OPT_PARSE_GNU))
+		return cli_opt_usage_error(COMMAND_NAME, opts, &invalid_opt);
+
+	if (show_help) {
+		print_help();
+		return 0;
+	}
+
+	if (verbose) {
+		idx_opts.progress_cb = cli_progress_indexer;
+		idx_opts.progress_cb_payload = &progress;
+	}
+
+	if (read_stdin) {
+		fd = fileno(stdin);
+	} else if ((fd = p_open(filename, O_RDONLY)) < 0) {
+		ret = cli_error_git();
+		goto done;
+	}
+
+#ifdef GIT_EXPERIMENTAL_SHA256
+	ret = git_indexer_new(&idx, ".", GIT_OID_SHA1, &idx_opts);
+#else
+	ret = git_indexer_new(&idx, ".", 0, NULL, &idx_opts);
+#endif
+
+	if (ret < 0) {
+		ret = cli_error_git();
+		goto done;
+	}
+
+	while ((read_len = p_read(fd, buf, sizeof(buf))) > 0) {
+		if (git_indexer_append(idx, buf, (size_t)read_len, &stats) < 0) {
+			ret = cli_error_git();
+			goto done;
+		}
+	}
+
+	if (git_indexer_commit(idx, &stats) < 0) {
+		ret = cli_error_git();
+		goto done;
+	}
+
+	cli_progress_finish(&progress);
+
+done:
+	if (!read_stdin && fd >= 0)
+		p_close(fd);
+
+	cli_progress_dispose(&progress);
+	git_indexer_free(idx);
+	return ret;
+}
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;
+}
diff --git a/src/cli/common.h b/src/cli/common.h
new file mode 100644
index 0000000..3aed8ad
--- /dev/null
+++ b/src/cli/common.h
@@ -0,0 +1,66 @@
+/*
+ * 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.
+ */
+
+#ifndef CLI_common_h__
+#define CLI_common_h__
+
+#define PROGRAM_NAME "git2"
+
+#include "git2_util.h"
+
+#include "error.h"
+#include "opt.h"
+#include "opt_usage.h"
+
+/*
+ * Common command arguments.
+ */
+
+#define CLI_COMMON_OPT_HELP \
+	CLI_OPT_TYPE_SWITCH, "help",       0, &show_help, 1, \
+	CLI_OPT_USAGE_HIDDEN | CLI_OPT_USAGE_STOP_PARSING
+#define CLI_COMMON_OPT_CONFIG \
+	CLI_OPT_TYPE_VALUE,   NULL,       'c', NULL,      0, \
+	CLI_OPT_USAGE_HIDDEN
+#define CLI_COMMON_OPT_CONFIG_ENV \
+	CLI_OPT_TYPE_VALUE,  "config-env", 0,  NULL,      0, \
+	CLI_OPT_USAGE_HIDDEN
+
+#define CLI_COMMON_OPT \
+	{ CLI_COMMON_OPT_HELP }, \
+	{ CLI_COMMON_OPT_CONFIG }, \
+	{ CLI_COMMON_OPT_CONFIG_ENV }
+
+typedef struct {
+	char **args;
+	int args_len;
+} cli_repository_open_options;
+
+extern int cli_repository_open(
+	git_repository **out,
+	cli_repository_open_options *opts);
+
+/*
+ * Common command arguments.
+ */
+
+#define CLI_COMMON_OPT_HELP \
+	CLI_OPT_TYPE_SWITCH, "help",       0, &show_help, 1, \
+	CLI_OPT_USAGE_HIDDEN | CLI_OPT_USAGE_STOP_PARSING
+#define CLI_COMMON_OPT_CONFIG \
+	CLI_OPT_TYPE_VALUE,   NULL,       'c', NULL,      0, \
+	CLI_OPT_USAGE_HIDDEN
+#define CLI_COMMON_OPT_CONFIG_ENV \
+	CLI_OPT_TYPE_VALUE,  "config-env", 0,  NULL,      0, \
+	CLI_OPT_USAGE_HIDDEN
+
+#define CLI_COMMON_OPT \
+	{ CLI_COMMON_OPT_HELP }, \
+	{ CLI_COMMON_OPT_CONFIG }, \
+	{ CLI_COMMON_OPT_CONFIG_ENV }
+
+#endif /* CLI_common_h__ */
diff --git a/src/cli/error.h b/src/cli/error.h
index cce7a54..abf8a51 100644
--- a/src/cli/error.h
+++ b/src/cli/error.h
@@ -8,7 +8,7 @@
 #ifndef CLI_error_h__
 #define CLI_error_h__
 
-#include "cli.h"
+#include "common.h"
 #include <stdio.h>
 
 #define CLI_EXIT_OK      0
diff --git a/src/cli/main.c b/src/cli/main.c
index cbfc50e..c7a6fcf 100644
--- a/src/cli/main.c
+++ b/src/cli/main.c
@@ -7,7 +7,7 @@
 
 #include <stdio.h>
 #include <git2.h>
-#include "cli.h"
+#include "common.h"
 #include "cmd.h"
 
 static int show_help = 0;
@@ -16,8 +16,12 @@ static char *command = NULL;
 static char **args = NULL;
 
 const cli_opt_spec cli_common_opts[] = {
-	{ CLI_OPT_TYPE_SWITCH,    "help",      0, &show_help,    1,
-	  CLI_OPT_USAGE_DEFAULT,   NULL,      "display help information" },
+	{ CLI_OPT_TYPE_SWITCH,    "help",       0, &show_help,    1,
+	  CLI_OPT_USAGE_DEFAULT,   NULL,       "display help information" },
+	{ CLI_OPT_TYPE_VALUE,      NULL,       'c', NULL,         0,
+	  CLI_OPT_USAGE_DEFAULT,  "key=value", "add configuration value" },
+	{ CLI_OPT_TYPE_VALUE,     "config-env", 0, NULL,          0,
+	  CLI_OPT_USAGE_DEFAULT,  "key=value", "set configuration value to environment variable" },
 	{ CLI_OPT_TYPE_SWITCH,    "version",   0, &show_version, 1,
 	  CLI_OPT_USAGE_DEFAULT,   NULL,      "display the version" },
 	{ CLI_OPT_TYPE_ARG,       "command",   0, &command,      0,
@@ -30,19 +34,40 @@ const cli_opt_spec cli_common_opts[] = {
 const cli_cmd_spec cli_cmds[] = {
 	{ "cat-file",    cmd_cat_file,    "Display an object in the repository" },
 	{ "clone",       cmd_clone,       "Clone a repository into a new directory" },
+	{ "config",      cmd_config,      "View or set configuration values " },
 	{ "hash-object", cmd_hash_object, "Hash a raw object and product its object ID" },
 	{ "help",        cmd_help,        "Display help information" },
+	{ "index-pack",  cmd_index_pack,  "Create an index for a packfile" },
 	{ NULL }
 };
 
+/*
+ * Reorder the argv as it was given, since git has the notion of global
+ * options (like `--help` or `-c key=val`) that we want to pass to the
+ * subcommand, and that can appear early in the arguments, before the
+ * command name. Put the command-name in argv[1] to allow easier parsing.
+ */
+static void reorder_args(char **argv, size_t first)
+{
+	char *tmp;
+	size_t i;
+
+	if (first == 1)
+		return;
+
+	tmp = argv[first];
+
+	for (i = first; i > 1; i--)
+		argv[i] = argv[i - 1];
+
+	argv[1] = tmp;
+}
+
 int main(int argc, char **argv)
 {
 	const cli_cmd_spec *cmd;
 	cli_opt_parser optparser;
 	cli_opt opt;
-	char *help_args[3] = { NULL };
-	int help_args_len;
-	int args_len = 0;
 	int ret = 0;
 
 	if (git_libgit2_init() < 0) {
@@ -66,8 +91,7 @@ int main(int argc, char **argv)
 		 * remaining arguments as args for the command itself.
 		 */
 		if (command) {
-			args = &argv[optparser.idx];
-			args_len = (int)(argc - optparser.idx);
+			reorder_args(argv, optparser.idx);
 			break;
 		}
 	}
@@ -77,19 +101,9 @@ int main(int argc, char **argv)
 		goto done;
 	}
 
-	/*
-	 * If `--help <command>` is specified, delegate to that command's
-	 * `--help` option.  If no command is specified, run the `help`
-	 * command.  Do this by updating the args to emulate that behavior.
-	 */
-	if (!command || show_help) {
-		help_args[0] = command ? (char *)command : "help";
-		help_args[1] = command ? "--help" : NULL;
-		help_args_len = command ? 2 : 1;
-
-		command = help_args[0];
-		args = help_args;
-		args_len = help_args_len;
+	if (!command) {
+		ret = cmd_help(argc, argv);
+		goto done;
 	}
 
 	if ((cmd = cli_cmd_spec_byname(command)) == NULL) {
@@ -98,7 +112,7 @@ int main(int argc, char **argv)
 		goto done;
 	}
 
-	ret = cmd->fn(args_len, args);
+	ret = cmd->fn(argc - 1, &argv[1]);
 
 done:
 	git_libgit2_shutdown();
diff --git a/src/cli/opt.c b/src/cli/opt.c
index 62a3430..9242e22 100644
--- a/src/cli/opt.c
+++ b/src/cli/opt.c
@@ -10,7 +10,7 @@
  * This file was produced by using the `rename.pl` script included with
  * adopt.  The command-line specified was:
  *
- * ./rename.pl cli_opt --filename=opt --include=cli.h --inline=GIT_INLINE --header-guard=CLI_opt_h__ --lowercase-status --without-usage
+ * ./rename.pl cli_opt --filename=opt --include=common.h --inline=GIT_INLINE --header-guard=CLI_opt_h__ --lowercase-status --without-usage
  */
 
 #include <stdlib.h>
@@ -19,7 +19,11 @@
 #include <limits.h>
 #include <assert.h>
 
-#include "cli.h"
+#if defined(__sun) || defined(__illumos__)
+# include <alloca.h>
+#endif
+
+#include "common.h"
 #include "opt.h"
 
 #ifdef _WIN32
@@ -73,7 +77,7 @@ GIT_INLINE(const cli_opt_spec *) spec_for_long(
 
 		/* Handle --option=value arguments */
 		if (spec->type == CLI_OPT_TYPE_VALUE &&
-		    eql &&
+		    spec->name && eql &&
 		    strncmp(arg, spec->name, eql_pos) == 0 &&
 		    spec->name[eql_pos] == '\0') {
 			*has_value = 1;
@@ -575,6 +579,28 @@ cli_opt_status_t cli_opt_parse(
 	return validate_required(opt, specs, given_specs);
 }
 
+int cli_opt_foreach(
+	const cli_opt_spec specs[],
+	char **args,
+	size_t args_len,
+	unsigned int flags,
+	int (*callback)(cli_opt *, void *),
+	void *callback_data)
+{
+	cli_opt_parser parser;
+	cli_opt opt;
+	int ret;
+
+	cli_opt_parser_init(&parser, specs, args, args_len, flags);
+
+	while (cli_opt_parser_next(&opt, &parser)) {
+		if ((ret = callback(&opt, callback_data)) != 0)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int spec_name_fprint(FILE *file, const cli_opt_spec *spec)
 {
 	int error;
diff --git a/src/cli/opt.h b/src/cli/opt.h
index 6c1d460..226f74d 100644
--- a/src/cli/opt.h
+++ b/src/cli/opt.h
@@ -10,7 +10,7 @@
  * This file was produced by using the `rename.pl` script included with
  * adopt.  The command-line specified was:
  *
- * ./rename.pl cli_opt --filename=opt --include=cli.h --inline=GIT_INLINE --header-guard=CLI_opt_h__ --lowercase-status --without-usage
+ * ./rename.pl cli_opt --filename=opt --include=common.h --inline=GIT_INLINE --header-guard=CLI_opt_h__ --lowercase-status --without-usage
  */
 
 #ifndef CLI_opt_h__
@@ -275,8 +275,8 @@ typedef struct cli_opt_parser {
 	size_t arg_idx;
 	size_t in_args;
 	size_t in_short;
-	int needs_sort : 1,
-	    in_literal : 1;
+	unsigned int needs_sort : 1,
+	             in_literal : 1;
 } cli_opt_parser;
 
 /**
@@ -301,6 +301,24 @@ cli_opt_status_t cli_opt_parse(
     unsigned int flags);
 
 /**
+ * Quickly executes the given callback for each argument.
+ *
+ * @param specs A NULL-terminated array of `cli_opt_spec`s that can be parsed
+ * @param args The arguments that will be parsed
+ * @param args_len The length of arguments to be parsed
+ * @param flags The `cli_opt_flag_t flags for parsing
+ * @param callback The callback to invoke for each specified option
+ * @param callback_data Data to be provided to the callback
+ */
+int cli_opt_foreach(
+	const cli_opt_spec specs[],
+	char **args,
+	size_t args_len,
+	unsigned int flags,
+	int (*callback)(cli_opt *, void *),
+	void *callback_data);
+
+/**
  * Initializes a parser that parses the given arguments according to the
  * given specifications.
  *
diff --git a/src/cli/opt_usage.c b/src/cli/opt_usage.c
index 478b416..8374f51 100644
--- a/src/cli/opt_usage.c
+++ b/src/cli/opt_usage.c
@@ -5,7 +5,7 @@
  * a Linking Exception. For full terms see the included COPYING file.
  */
 
-#include "cli.h"
+#include "common.h"
 #include "str.h"
 
 static int print_spec_name(git_str *out, const cli_opt_spec *spec)
diff --git a/src/cli/progress.c b/src/cli/progress.c
index ddfbafb..d975b09 100644
--- a/src/cli/progress.c
+++ b/src/cli/progress.c
@@ -242,7 +242,21 @@ static int fetch_receiving(
 		done ? ", done." : "");
 }
 
-static int fetch_resolving(
+static int indexer_indexing(
+	cli_progress *progress,
+	const git_indexer_progress *stats)
+{
+	bool done = (stats->received_objects == stats->total_objects);
+
+	return progress_printf(progress, false,
+		"Indexing objects: %3d%% (%d/%d)%s\r",
+		percent(stats->received_objects, stats->total_objects),
+		stats->received_objects,
+		stats->total_objects,
+		done ? ", done." : "");
+}
+
+static int indexer_resolving(
 	cli_progress *progress,
 	const git_indexer_progress *stats)
 {
@@ -283,7 +297,42 @@ int cli_progress_fetch_transfer(const git_indexer_progress *stats, void *payload
 		/* fall through */
 
 	case CLI_PROGRESS_RESOLVING:
-		error = fetch_resolving(progress, stats);
+		error = indexer_resolving(progress, stats);
+		break;
+
+	default:
+		/* should not be reached */
+		GIT_ASSERT(!"unexpected progress state");
+	}
+
+	return error;
+}
+
+int cli_progress_indexer(
+	const git_indexer_progress *stats,
+	void *payload)
+{
+	cli_progress *progress = (cli_progress *)payload;
+	int error = 0;
+
+	switch (progress->action) {
+	case CLI_PROGRESS_NONE:
+		progress->action = CLI_PROGRESS_INDEXING;
+		/* fall through */
+
+	case CLI_PROGRESS_INDEXING:
+		if ((error = indexer_indexing(progress, stats)) < 0)
+			break;
+
+		if (stats->indexed_deltas == stats->total_deltas)
+			break;
+
+		progress_complete(progress);
+		progress->action = CLI_PROGRESS_RESOLVING;
+		/* fall through */
+
+	case CLI_PROGRESS_RESOLVING:
+		error = indexer_resolving(progress, stats);
 		break;
 
 	default:
diff --git a/src/cli/progress.h b/src/cli/progress.h
index 886fef8..f08d68f 100644
--- a/src/cli/progress.h
+++ b/src/cli/progress.h
@@ -22,6 +22,7 @@
 typedef enum {
 	CLI_PROGRESS_NONE,
 	CLI_PROGRESS_RECEIVING,
+	CLI_PROGRESS_INDEXING,
 	CLI_PROGRESS_RESOLVING,
 	CLI_PROGRESS_CHECKING_OUT
 } cli_progress_t;
@@ -75,6 +76,17 @@ extern int cli_progress_fetch_transfer(
 	void *payload);
 
 /**
+ * Prints indexer progress to the console. Suitable for a
+ * `progress_cb` callback for `git_indexer_options`.
+ *
+ * @param stats The indexer stats
+ * @param payload A pointer to the cli_progress
+ */
+extern int cli_progress_indexer(
+	const git_indexer_progress *stats,
+	void *payload);
+
+/**
  * Prints checkout progress to the console.  Suitable for a
  * `progress_cb` callback for `git_checkout_options`.
  *
diff --git a/src/cli/unix/sighandler.c b/src/cli/unix/sighandler.c
index 6b4982d..05ac867 100644
--- a/src/cli/unix/sighandler.c
+++ b/src/cli/unix/sighandler.c
@@ -8,7 +8,8 @@
 #include <stdint.h>
 #include <signal.h>
 #include "git2_util.h"
-#include "cli.h"
+#include "common.h"
+#include "sighandler.h"
 
 static void (*interrupt_handler)(void) = NULL;
 
diff --git a/src/cli/win32/precompiled.h b/src/cli/win32/precompiled.h
index b0309b8..031370e 100644
--- a/src/cli/win32/precompiled.h
+++ b/src/cli/win32/precompiled.h
@@ -1,3 +1,3 @@
 #include <git2.h>
 
-#include "cli.h"
+#include "common.h"
diff --git a/src/cli/win32/sighandler.c b/src/cli/win32/sighandler.c
index cc0b646..05a67fb 100644
--- a/src/cli/win32/sighandler.c
+++ b/src/cli/win32/sighandler.c
@@ -8,7 +8,7 @@
 #include "git2_util.h"
 #include <windows.h>
 
-#include "cli.h"
+#include "sighandler.h"
 
 static void (*interrupt_handler)(void) = NULL;