thodg/libgit2/src/remote.c

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• Hash : 64bcf567
  Author :
  Date : 2014-10-26T10:30:05
  

  Fixed potential crash with uninitialized variables

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• src/remote.c

• /*
   * 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/config.h"
  #include "git2/types.h"
  #include "git2/oid.h"
  #include "git2/net.h"
  
  #include "common.h"
  #include "config.h"
  #include "repository.h"
  #include "remote.h"
  #include "fetch.h"
  #include "refs.h"
  #include "refspec.h"
  #include "fetchhead.h"
  
  static int dwim_refspecs(git_vector *out, git_vector *refspecs, git_vector *refs);
  
  static int add_refspec_to(git_vector *vector, const char *string, bool is_fetch)
  {
  	git_refspec *spec;
  
  	spec = git__calloc(1, sizeof(git_refspec));
  	GITERR_CHECK_ALLOC(spec);
  
  	if (git_refspec__parse(spec, string, is_fetch) < 0) {
  		git__free(spec);
  		return -1;
  	}
  
  	spec->push = !is_fetch;
  	if (git_vector_insert(vector, spec) < 0) {
  		git_refspec__free(spec);
  		git__free(spec);
  		return -1;
  	}
  
  	return 0;
  }
  
  static int add_refspec(git_remote *remote, const char *string, bool is_fetch)
  {
  	return add_refspec_to(&remote->refspecs, string, is_fetch);
  }
  
  static int download_tags_value(git_remote *remote, git_config *cfg)
  {
  	const git_config_entry *ce;
  	git_buf buf = GIT_BUF_INIT;
  	int error;
  
  	/* The 0 value is the default (auto), let's see if we need to change it */
  	if (git_buf_printf(&buf, "remote.%s.tagopt", remote->name) < 0)
  		return -1;
  
  	error = git_config__lookup_entry(&ce, cfg, git_buf_cstr(&buf), false);
  	git_buf_free(&buf);
  
  	if (!error && ce && ce->value) {
  		if (!strcmp(ce->value, "--no-tags"))
  			remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_NONE;
  		else if (!strcmp(ce->value, "--tags"))
  			remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_ALL;
  	}
  
  	return error;
  }
  
  static int ensure_remote_name_is_valid(const char *name)
  {
  	int error = 0;
  
  	if (!git_remote_is_valid_name(name)) {
  		giterr_set(
  			GITERR_CONFIG,
  			"'%s' is not a valid remote name.", name ? name : "(null)");
  		error = GIT_EINVALIDSPEC;
  	}
  
  	return error;
  }
  
  #if 0
  /* We could export this as a helper */
  static int get_check_cert(int *out, git_repository *repo)
  {
  	git_config *cfg;
  	const char *val;
  	int error = 0;
  
  	assert(out && repo);
  
  	/* By default, we *DO* want to verify the certificate. */
  	*out = 1;
  
  	/* Go through the possible sources for SSL verification settings, from
  	 * most specific to least specific. */
  
  	/* GIT_SSL_NO_VERIFY environment variable */
  	if ((val = getenv("GIT_SSL_NO_VERIFY")) != NULL)
  		return git_config_parse_bool(out, val);
  
  	/* http.sslVerify config setting */
  	if ((error = git_repository_config__weakptr(&cfg, repo)) < 0)
  		return error;
  
  	*out = git_config__get_bool_force(cfg, "http.sslverify", 1);
  	return 0;
  }
  #endif
  
  static int canonicalize_url(git_buf *out, const char *in)
  {
  #ifdef GIT_WIN32
  	const char *c;
  
  	/* Given a UNC path like \\server\path, we need to convert this
  	 * to //server/path for compatibility with core git.
  	 */
  	if (in[0] == '\\' && in[1] == '\\' &&
  		(git__isalpha(in[2]) || git__isdigit(in[2]))) {
  		for (c = in; *c; c++)
  			git_buf_putc(out, *c == '\\' ? '/' : *c);
  
  		return git_buf_oom(out) ? -1 : 0;
  	}
  #endif
  
  	return git_buf_puts(out, in);
  }
  
  static int create_internal(git_remote **out, git_repository *repo, const char *name, const char *url, const char *fetch)
  {
  	git_remote *remote;
  	git_buf canonical_url = GIT_BUF_INIT, fetchbuf = GIT_BUF_INIT;
  	int error = -1;
  
  	/* name is optional */
  	assert(out && repo && url);
  
  	remote = git__calloc(1, sizeof(git_remote));
  	GITERR_CHECK_ALLOC(remote);
  
  	remote->repo = repo;
  	remote->update_fetchhead = 1;
  
  	if (git_vector_init(&remote->refs, 32, NULL) < 0 ||
  		canonicalize_url(&canonical_url, url) < 0)
  		goto on_error;
  
  	remote->url = git_buf_detach(&canonical_url);
  
  	if (name != NULL) {
  		remote->name = git__strdup(name);
  		GITERR_CHECK_ALLOC(remote->name);
  	}
  
  	if (fetch != NULL) {
  		if (add_refspec(remote, fetch, true) < 0)
  			goto on_error;
  	}
  
  	if (!name)
  		/* A remote without a name doesn't download tags */
  		remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_NONE;
  
  	*out = remote;
  	git_buf_free(&fetchbuf);
  	git_buf_free(&canonical_url);
  	return 0;
  
  on_error:
  	git_remote_free(remote);
  	git_buf_free(&fetchbuf);
  	git_buf_free(&canonical_url);
  	return error;
  }
  
  static int ensure_remote_doesnot_exist(git_repository *repo, const char *name)
  {
  	int error;
  	git_remote *remote;
  
  	error = git_remote_load(&remote, repo, name);
  
  	if (error == GIT_ENOTFOUND)
  		return 0;
  
  	if (error < 0)
  		return error;
  
  	git_remote_free(remote);
  
  	giterr_set(
  		GITERR_CONFIG,
  		"Remote '%s' already exists.", name);
  
  	return GIT_EEXISTS;
  }
  
  
  int git_remote_create(git_remote **out, git_repository *repo, const char *name, const char *url)
  {
  	git_buf buf = GIT_BUF_INIT;
  	git_remote *remote = NULL;
  	int error;
  
  	if ((error = ensure_remote_name_is_valid(name)) < 0)
  		return error;
  
  	if ((error = ensure_remote_doesnot_exist(repo, name)) < 0)
  		return error;
  
  	if (git_buf_printf(&buf, "+refs/heads/*:refs/remotes/%s/*", name) < 0)
  		return -1;
  
  	if (create_internal(&remote, repo, name, url, git_buf_cstr(&buf)) < 0)
  		goto on_error;
  
  	git_buf_free(&buf);
  
  	if (git_remote_save(remote) < 0)
  		goto on_error;
  
  	*out = remote;
  
  	return 0;
  
  on_error:
  	git_buf_free(&buf);
  	git_remote_free(remote);
  	return -1;
  }
  
  int git_remote_create_with_fetchspec(git_remote **out, git_repository *repo, const char *name, const char *url, const char *fetch)
  {
  	git_remote *remote = NULL;
  	int error;
  
  	if ((error = ensure_remote_name_is_valid(name)) < 0)
  		return error;
  
  	if ((error = ensure_remote_doesnot_exist(repo, name)) < 0)
  		return error;
  
  	if (create_internal(&remote, repo, name, url, fetch) < 0)
  		goto on_error;
  
  	if (git_remote_save(remote) < 0)
  		goto on_error;
  
  	*out = remote;
  
  	return 0;
  
  on_error:
  	git_remote_free(remote);
  	return -1;
  }
  
  int git_remote_create_anonymous(git_remote **out, git_repository *repo, const char *url, const char *fetch)
  {
  	int error;
  	git_remote *remote;
  
  	if ((error = create_internal(&remote, repo, NULL, url, fetch)) < 0)
  		return error;
  
  	*out = remote;
  	return 0;
  }
  
  int git_remote_dup(git_remote **dest, git_remote *source)
  {
  	int error = 0;
  	git_strarray refspecs = { 0 };
  	git_remote *remote = git__calloc(1, sizeof(git_remote));
  	GITERR_CHECK_ALLOC(remote);
  
  	if (source->name != NULL) {
  		remote->name = git__strdup(source->name);
  		GITERR_CHECK_ALLOC(remote->name);
  	}
  
  	if (source->url != NULL) {
  		remote->url = git__strdup(source->url);
  		GITERR_CHECK_ALLOC(remote->url);		
  	}
  
  	if (source->pushurl != NULL) {
  		remote->pushurl = git__strdup(source->pushurl);
  		GITERR_CHECK_ALLOC(remote->pushurl);
  	}
  
  	remote->transport_cb = source->transport_cb;
  	remote->transport_cb_payload = source->transport_cb_payload;
  	remote->repo = source->repo;
  	remote->download_tags = source->download_tags;
  	remote->update_fetchhead = source->update_fetchhead;
  
  	if (git_vector_init(&remote->refs, 32, NULL) < 0 ||
  	    git_vector_init(&remote->refspecs, 2, NULL) < 0 ||
  	    git_vector_init(&remote->active_refspecs, 2, NULL) < 0) {
  		error = -1;
  		goto cleanup;
  	}
  
  	if ((error = git_remote_get_fetch_refspecs(&refspecs, source)) < 0 ||
  	    (error = git_remote_set_fetch_refspecs(remote, &refspecs)) < 0)
  		goto cleanup;
  
  	git_strarray_free(&refspecs);
  
  	if ((error = git_remote_get_push_refspecs(&refspecs, source)) < 0 ||
  	    (error = git_remote_set_push_refspecs(remote, &refspecs)) < 0)
  		goto cleanup;
  
  	*dest = remote;
  
  cleanup:
  
  	git_strarray_free(&refspecs);
  
  	if (error < 0)
  		git__free(remote);
  
  	return error;
  }
  
  struct refspec_cb_data {
  	git_remote *remote;
  	int fetch;
  };
  
  static int refspec_cb(const git_config_entry *entry, void *payload)
  {
  	struct refspec_cb_data *data = (struct refspec_cb_data *)payload;
  	return add_refspec(data->remote, entry->value, data->fetch);
  }
  
  static int get_optional_config(
  	bool *found, git_config *config, git_buf *buf,
  	git_config_foreach_cb cb, void *payload)
  {
  	int error = 0;
  	const char *key = git_buf_cstr(buf);
  
  	if (git_buf_oom(buf))
  		return -1;
  
  	if (cb != NULL)
  		error = git_config_get_multivar_foreach(config, key, NULL, cb, payload);
  	else
  		error = git_config_get_string(payload, config, key);
  
  	if (found)
  		*found = !error;
  
  	if (error == GIT_ENOTFOUND) {
  		giterr_clear();
  		error = 0;
  	}
  
  	return error;
  }
  
  int git_remote_load(git_remote **out, git_repository *repo, const char *name)
  {
  	git_remote *remote;
  	git_buf buf = GIT_BUF_INIT;
  	const char *val;
  	int error = 0;
  	git_config *config;
  	struct refspec_cb_data data = { NULL };
  	bool optional_setting_found = false, found;
  
  	assert(out && repo && name);
  
  	if ((error = ensure_remote_name_is_valid(name)) < 0)
  		return error;
  
  	if ((error = git_repository_config_snapshot(&config, repo)) < 0)
  		return error;
  
  	remote = git__malloc(sizeof(git_remote));
  	GITERR_CHECK_ALLOC(remote);
  
  	memset(remote, 0x0, sizeof(git_remote));
  	remote->update_fetchhead = 1;
  	remote->name = git__strdup(name);
  	GITERR_CHECK_ALLOC(remote->name);
  
  	if (git_vector_init(&remote->refs, 32, NULL) < 0 ||
  	    git_vector_init(&remote->refspecs, 2, NULL) < 0 ||
  	    git_vector_init(&remote->passive_refspecs, 2, NULL) < 0 ||
  	    git_vector_init(&remote->active_refspecs, 2, NULL) < 0) {
  		error = -1;
  		goto cleanup;
  	}
  
  	if ((error = git_buf_printf(&buf, "remote.%s.url", name)) < 0)
  		goto cleanup;
  
  	if ((error = get_optional_config(&found, config, &buf, NULL, (void *)&val)) < 0)
  		goto cleanup;
  
  	optional_setting_found |= found;
  
  	remote->repo = repo;
  
  	if (found && strlen(val) > 0) {
  		remote->url = git__strdup(val);
  		GITERR_CHECK_ALLOC(remote->url);
  	}
  
  	val = NULL;
  	git_buf_clear(&buf);
  	git_buf_printf(&buf, "remote.%s.pushurl", name);
  
  	if ((error = get_optional_config(&found, config, &buf, NULL, (void *)&val)) < 0)
  		goto cleanup;
  
  	optional_setting_found |= found;
  
  	if (!optional_setting_found) {
  		error = GIT_ENOTFOUND;
  		giterr_set(GITERR_CONFIG, "Remote '%s' does not exist.", name);
  		goto cleanup;
  	}
  
  	if (found && strlen(val) > 0) {
  		remote->pushurl = git__strdup(val);
  		GITERR_CHECK_ALLOC(remote->pushurl);
  	}
  
  	data.remote = remote;
  	data.fetch = true;
  
  	git_buf_clear(&buf);
  	git_buf_printf(&buf, "remote.%s.fetch", name);
  
  	if ((error = get_optional_config(NULL, config, &buf, refspec_cb, &data)) < 0)
  		goto cleanup;
  
  	data.fetch = false;
  	git_buf_clear(&buf);
  	git_buf_printf(&buf, "remote.%s.push", name);
  
  	if ((error = get_optional_config(NULL, config, &buf, refspec_cb, &data)) < 0)
  		goto cleanup;
  
  	if (download_tags_value(remote, config) < 0)
  		goto cleanup;
  
  	/* Move the data over to where the matching functions can find them */
  	if (dwim_refspecs(&remote->active_refspecs, &remote->refspecs, &remote->refs) < 0)
  		goto cleanup;
  
  	*out = remote;
  
  cleanup:
  	git_config_free(config);
  	git_buf_free(&buf);
  
  	if (error < 0)
  		git_remote_free(remote);
  
  	return error;
  }
  
  static int update_config_refspec(const git_remote *remote, git_config *config, int direction)
  {
  	git_buf name = GIT_BUF_INIT;
  	unsigned int push;
  	const char *dir;
  	size_t i;
  	int error = 0;
  	const char *cname;
  
  	push = direction == GIT_DIRECTION_PUSH;
  	dir = push ? "push" : "fetch";
  
  	if (git_buf_printf(&name, "remote.%s.%s", remote->name, dir) < 0)
  		return -1;
  	cname = git_buf_cstr(&name);
  
  	/* Clear out the existing config */
  	while (!error)
  		error = git_config_delete_multivar(config, cname, ".*");
  
  	if (error != GIT_ENOTFOUND)
  		return error;
  
  	for (i = 0; i < remote->refspecs.length; i++) {
  		git_refspec *spec = git_vector_get(&remote->refspecs, i);
  
  		if (spec->push != push)
  			continue;
  
  		// "$^" is a unmatcheable regexp: it will not match anything at all, so
  		// all values will be considered new and we will not replace any
  		// present value.
  		if ((error = git_config_set_multivar(
  				config, cname, "$^", spec->string)) < 0) {
  			goto cleanup;
  		}
  	}
  
  	giterr_clear();
  	error = 0;
  
  cleanup:
  	git_buf_free(&name);
  
  	return error;
  }
  
  int git_remote_save(const git_remote *remote)
  {
  	int error;
  	git_config *cfg;
  	const char *tagopt = NULL;
  	git_buf buf = GIT_BUF_INIT;
  	const git_config_entry *existing;
  
  	assert(remote);
  
  	if (!remote->name) {
  		giterr_set(GITERR_INVALID, "Can't save an anonymous remote.");
  		return GIT_EINVALIDSPEC;
  	}
  
  	if ((error = ensure_remote_name_is_valid(remote->name)) < 0)
  		return error;
  
  	if ((error = git_repository_config__weakptr(&cfg, remote->repo)) < 0)
  		return error;
  
  	if ((error = git_buf_printf(&buf, "remote.%s.url", remote->name)) < 0)
  		return error;
  
  	/* after this point, buffer is allocated so end with cleanup */
  
  	if ((error = git_config_set_string(
  			cfg, git_buf_cstr(&buf), remote->url)) < 0)
  		goto cleanup;
  
  	git_buf_clear(&buf);
  	if ((error = git_buf_printf(&buf, "remote.%s.pushurl", remote->name)) < 0)
  		goto cleanup;
  
  	if ((error = git_config__update_entry(
  			cfg, git_buf_cstr(&buf), remote->pushurl, true, false)) < 0)
  		goto cleanup;
  
  	if ((error = update_config_refspec(remote, cfg, GIT_DIRECTION_FETCH)) < 0)
  		goto cleanup;
  
  	if ((error = update_config_refspec(remote, cfg, GIT_DIRECTION_PUSH)) < 0)
  		goto cleanup;
  
  	/*
  	 * What action to take depends on the old and new values. This
  	 * is describes by the table below. tagopt means whether the
  	 * is already a value set in the config
  	 *
  	 *            AUTO     ALL or NONE
  	 *         +-----------------------+
  	 *  tagopt | remove  |     set     |
  	 *         +---------+-------------|
  	 * !tagopt | nothing |     set     |
  	 *         +---------+-------------+
  	 */
  
  	git_buf_clear(&buf);
  	if ((error = git_buf_printf(&buf, "remote.%s.tagopt", remote->name)) < 0)
  		goto cleanup;
  
  	if ((error = git_config__lookup_entry(
  			&existing, cfg, git_buf_cstr(&buf), false)) < 0)
  		goto cleanup;
  
  	if (remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL)
  		tagopt = "--tags";
  	else if (remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_NONE)
  		tagopt = "--no-tags";
  	else if (existing != NULL)
  		tagopt = NULL;
  
  	error = git_config__update_entry(
  		cfg, git_buf_cstr(&buf), tagopt, true, false);
  
  cleanup:
  	git_buf_free(&buf);
  	return error;
  }
  
  const char *git_remote_name(const git_remote *remote)
  {
  	assert(remote);
  	return remote->name;
  }
  
  git_repository *git_remote_owner(const git_remote *remote)
  {
  	assert(remote);
  	return remote->repo;
  }
  
  const char *git_remote_url(const git_remote *remote)
  {
  	assert(remote);
  	return remote->url;
  }
  
  int git_remote_set_url(git_remote *remote, const char* url)
  {
  	assert(remote);
  	assert(url);
  
  	git__free(remote->url);
  	remote->url = git__strdup(url);
  	GITERR_CHECK_ALLOC(remote->url);
  
  	return 0;
  }
  
  const char *git_remote_pushurl(const git_remote *remote)
  {
  	assert(remote);
  	return remote->pushurl;
  }
  
  int git_remote_set_pushurl(git_remote *remote, const char* url)
  {
  	assert(remote);
  
  	git__free(remote->pushurl);
  	if (url) {
  		remote->pushurl = git__strdup(url);
  		GITERR_CHECK_ALLOC(remote->pushurl);
  	} else {
  		remote->pushurl = NULL;
  	}
  	return 0;
  }
  
  const char* git_remote__urlfordirection(git_remote *remote, int direction)
  {
  	assert(remote);
  
  	assert(direction == GIT_DIRECTION_FETCH || direction == GIT_DIRECTION_PUSH);
  
  	if (direction == GIT_DIRECTION_FETCH) {
  		return remote->url;
  	}
  
  	if (direction == GIT_DIRECTION_PUSH) {
  		return remote->pushurl ? remote->pushurl : remote->url;
  	}
  
  	return NULL;
  }
  
  int git_remote_connect(git_remote *remote, git_direction direction)
  {
  	git_transport *t;
  	const char *url;
  	int flags = GIT_TRANSPORTFLAGS_NONE;
  	int error;
  
  	assert(remote);
  
  	t = remote->transport;
  
  	url = git_remote__urlfordirection(remote, direction);
  	if (url == NULL) {
  		giterr_set(GITERR_INVALID,
  			"Malformed remote '%s' - missing URL", remote->name);
  		return -1;
  	}
  
  	/* If we don't have a transport object yet, and the caller specified a
  	 * custom transport factory, use that */
  	if (!t && remote->transport_cb &&
  		(error = remote->transport_cb(&t, remote, remote->transport_cb_payload)) < 0)
  		return error;
  
  	/* If we still don't have a transport, then use the global
  	 * transport registrations which map URI schemes to transport factories */
  	if (!t && (error = git_transport_new(&t, remote, url)) < 0)
  		return error;
  
  	if (t->set_callbacks &&
  	    (error = t->set_callbacks(t, remote->callbacks.sideband_progress, NULL, remote->callbacks.certificate_check, remote->callbacks.payload)) < 0)
  		goto on_error;
  
  	if ((error = t->connect(t, url, remote->callbacks.credentials, remote->callbacks.payload, direction, flags)) != 0)
  		goto on_error;
  
  	remote->transport = t;
  
  	return 0;
  
  on_error:
  	t->free(t);
  
  	if (t == remote->transport)
  		remote->transport = NULL;
  
  	return error;
  }
  
  int git_remote_ls(const git_remote_head ***out, size_t *size, git_remote *remote)
  {
  	assert(remote);
  
  	if (!remote->transport) {
  		giterr_set(GITERR_NET, "No transport bound to this remote");
  		return -1;
  	}
  
  	return remote->transport->ls(out, size, remote->transport);
  }
  
  int git_remote__get_http_proxy(git_remote *remote, bool use_ssl, char **proxy_url)
  {
  	git_config *cfg;
  	const git_config_entry *ce;
  	const char *val = NULL;
  	int error;
  
  	assert(remote);
  
  	if (!proxy_url || !remote->repo)
  		return -1;
  
  	*proxy_url = NULL;
  
  	if ((error = git_repository_config__weakptr(&cfg, remote->repo)) < 0)
  		return error;
  
  	/* Go through the possible sources for proxy configuration, from most specific
  	 * to least specific. */
  
  	/* remote.<name>.proxy config setting */
  	if (remote->name && remote->name[0]) {
  		git_buf buf = GIT_BUF_INIT;
  
  		if ((error = git_buf_printf(&buf, "remote.%s.proxy", remote->name)) < 0)
  			return error;
  
  		error = git_config__lookup_entry(&ce, cfg, git_buf_cstr(&buf), false);
  		git_buf_free(&buf);
  
  		if (error < 0)
  			return error;
  
  		if (ce && ce->value) {
  			val = ce->value;
  			goto found;
  		}
  	}
  
  	/* http.proxy config setting */
  	if ((error = git_config__lookup_entry(&ce, cfg, "http.proxy", false)) < 0)
  		return error;
  	if (ce && ce->value) {
  		val = ce->value;
  		goto found;
  	}
  
  	/* HTTP_PROXY / HTTPS_PROXY environment variables */
  	val = use_ssl ? getenv("HTTPS_PROXY") : getenv("HTTP_PROXY");
  
  found:
  	if (val && val[0]) {
  		*proxy_url = git__strdup(val);
  		GITERR_CHECK_ALLOC(*proxy_url);
  	}
  
  	return 0;
  }
  
  /* DWIM `refspecs` based on `refs` and append the output to `out` */
  static int dwim_refspecs(git_vector *out, git_vector *refspecs, git_vector *refs)
  {
  	size_t i;
  	git_refspec *spec;
  
  	git_vector_foreach(refspecs, i, spec) {
  		if (git_refspec__dwim_one(out, spec, refs) < 0)
  			return -1;
  	}
  
  	return 0;
  }
  
  static void free_refspecs(git_vector *vec)
  {
  	size_t i;
  	git_refspec *spec;
  
  	git_vector_foreach(vec, i, spec) {
  		git_refspec__free(spec);
  		git__free(spec);
  	}
  
  	git_vector_clear(vec);
  }
  
  static int remote_head_cmp(const void *_a, const void *_b)
  {
  	const git_remote_head *a = (git_remote_head *) _a;
  	const git_remote_head *b = (git_remote_head *) _b;
  
  	return git__strcmp_cb(a->name, b->name);
  }
  
  static int ls_to_vector(git_vector *out, git_remote *remote)
  {
  	git_remote_head **heads;
  	size_t heads_len, i;
  
  	if (git_remote_ls((const git_remote_head ***)&heads, &heads_len, remote) < 0)
  		return -1;
  
  	if (git_vector_init(out, heads_len, remote_head_cmp) < 0)
  		return -1;
  
  	for (i = 0; i < heads_len; i++) {
  		if (git_vector_insert(out, heads[i]) < 0)
  			return -1;
  	}
  
  	return 0;
  }
  
  int git_remote_download(git_remote *remote, const git_strarray *refspecs)
  {
  	int error = -1;
  	size_t i;
  	git_vector refs, specs, *to_active;
  
  	assert(remote);
  
  	if (ls_to_vector(&refs, remote) < 0)
  		return -1;
  
  	if ((git_vector_init(&specs, 0, NULL)) < 0)
  		goto on_error;
  
  	remote->passed_refspecs = 0;
  	if (!refspecs || !refspecs->count) {
  		to_active = &remote->refspecs;
  	} else {
  		for (i = 0; i < refspecs->count; i++) {
  			if ((error = add_refspec_to(&specs, refspecs->strings[i], true)) < 0)
  				goto on_error;
  		}
  
  		to_active = &specs;
  		remote->passed_refspecs = 1;
  	}
  
  	free_refspecs(&remote->passive_refspecs);
  	if ((error = dwim_refspecs(&remote->passive_refspecs, &remote->refspecs, &refs)) < 0)
  		goto on_error;
  
  	free_refspecs(&remote->active_refspecs);
  	error = dwim_refspecs(&remote->active_refspecs, to_active, &refs);
  
  	git_vector_free(&refs);
  	free_refspecs(&specs);
  	git_vector_free(&specs);
  
  	if (error < 0)
  		return error;
  
  	if ((error = git_fetch_negotiate(remote)) < 0)
  		return error;
  
  	return git_fetch_download_pack(remote);
  
  on_error:
  	git_vector_free(&refs);
  	free_refspecs(&specs);
  	git_vector_free(&specs);
  	return error;
  }
  
  int git_remote_fetch(
  		git_remote *remote,
  		const git_strarray *refspecs,
  		const git_signature *signature,
  		const char *reflog_message)
  {
  	int error;
  	git_buf reflog_msg_buf = GIT_BUF_INIT;
  
  	/* Connect and download everything */
  	if ((error = git_remote_connect(remote, GIT_DIRECTION_FETCH)) != 0)
  		return error;
  
  	error = git_remote_download(remote, refspecs);
  
  	/* We don't need to be connected anymore */
  	git_remote_disconnect(remote);
  
  	/* If the download failed, return the error */
  	if (error != 0)
  		return error;
  
  	/* Default reflog message */
  	if (reflog_message)
  		git_buf_sets(&reflog_msg_buf, reflog_message);
  	else {
  		git_buf_printf(&reflog_msg_buf, "fetch %s",
  				remote->name ? remote->name : remote->url);
  	}
  
  	/* Create "remote/foo" branches for all remote branches */
  	error = git_remote_update_tips(remote, signature, git_buf_cstr(&reflog_msg_buf));
  	git_buf_free(&reflog_msg_buf);
  	return error;
  }
  
  static int remote_head_for_fetchspec_src(git_remote_head **out, git_vector *update_heads, const char *fetchspec_src)
  {
  	unsigned int i;
  	git_remote_head *remote_ref;
  
  	assert(update_heads && fetchspec_src);
  
  	*out = NULL;
  
  	git_vector_foreach(update_heads, i, remote_ref) {
  		if (strcmp(remote_ref->name, fetchspec_src) == 0) {
  			*out = remote_ref;
  			break;
  		}
  	}
  
  	return 0;
  }
  
  static int remote_head_for_ref(git_remote_head **out, git_remote *remote, git_refspec *spec, git_vector *update_heads, git_reference *ref)
  {
  	git_reference *resolved_ref = NULL;
  	git_buf remote_name = GIT_BUF_INIT;
  	git_buf upstream_name = GIT_BUF_INIT;
  	git_buf config_key = GIT_BUF_INIT;
  	git_repository *repo;
  	git_config *config = NULL;
  	const char *ref_name, *branch_remote;
  	int error = 0;
  
  	assert(out && spec && ref);
  
  	*out = NULL;
  
  	repo = git_reference_owner(ref);
  
  	error = git_reference_resolve(&resolved_ref, ref);
  
  	/* If we're in an unborn branch, let's pretend nothing happened */
  	if (error == GIT_ENOTFOUND && git_reference_type(ref) == GIT_REF_SYMBOLIC) {
  		ref_name = git_reference_symbolic_target(ref);
  		error = 0;
  	} else {
  		ref_name = git_reference_name(resolved_ref);
  	}
  
  	if ((!git_reference__is_branch(ref_name)) ||
  	    (error = git_repository_config_snapshot(&config, repo)) < 0 ||
  	    (error = git_buf_printf(&config_key, "branch.%s.remote",
  	        ref_name + strlen(GIT_REFS_HEADS_DIR))) < 0 ||
  	    (error = git_config_get_string(&branch_remote, config, git_buf_cstr(&config_key))) < 0 ||
  	    git__strcmp(git_remote_name(remote), branch_remote) ||
  	    (error = git_branch_upstream_name(&upstream_name, repo, ref_name)) < 0 ||
  	    (error = git_refspec_rtransform(&remote_name, spec, upstream_name.ptr)) < 0) {
  		/* Not an error if there is no upstream */
  		if (error == GIT_ENOTFOUND)
  			error = 0;
  
  		goto cleanup;
  	}
  
  	error = remote_head_for_fetchspec_src(out, update_heads, git_buf_cstr(&remote_name));
  
  cleanup:
  	git_reference_free(resolved_ref);
  	git_buf_free(&remote_name);
  	git_buf_free(&upstream_name);
  	git_buf_free(&config_key);
  	git_config_free(config);
  	return error;
  }
  
  static int git_remote_write_fetchhead(git_remote *remote, git_refspec *spec, git_vector *update_heads)
  {
  	git_reference *head_ref = NULL;
  	git_fetchhead_ref *fetchhead_ref;
  	git_remote_head *remote_ref, *merge_remote_ref;
  	git_vector fetchhead_refs;
  	bool include_all_fetchheads;
  	unsigned int i = 0;
  	int error = 0;
  
  	assert(remote);
  
  	/* no heads, nothing to do */
  	if (update_heads->length == 0)
  		return 0;
  
  	if (git_vector_init(&fetchhead_refs, update_heads->length, git_fetchhead_ref_cmp) < 0)
  		return -1;
  
  	/* Iff refspec is * (but not subdir slash star), include tags */
  	include_all_fetchheads = (strcmp(GIT_REFS_HEADS_DIR "*", git_refspec_src(spec)) == 0);
  
  	/* Determine what to merge: if refspec was a wildcard, just use HEAD */
  	if (git_refspec_is_wildcard(spec)) {
  		if ((error = git_reference_lookup(&head_ref, remote->repo, GIT_HEAD_FILE)) < 0 ||
  			(error = remote_head_for_ref(&merge_remote_ref, remote, spec, update_heads, head_ref)) < 0)
  				goto cleanup;
  	} else {
  		/* If we're fetching a single refspec, that's the only thing that should be in FETCH_HEAD. */
  		if ((error = remote_head_for_fetchspec_src(&merge_remote_ref, update_heads, git_refspec_src(spec))) < 0)
  			goto cleanup;
  	}
  
  	/* Create the FETCH_HEAD file */
  	git_vector_foreach(update_heads, i, remote_ref) {
  		int merge_this_fetchhead = (merge_remote_ref == remote_ref);
  
  		if (!include_all_fetchheads &&
  			!git_refspec_src_matches(spec, remote_ref->name) &&
  			!merge_this_fetchhead)
  			continue;
  
  		if (git_fetchhead_ref_create(&fetchhead_ref,
  			&remote_ref->oid,
  			merge_this_fetchhead,
  			remote_ref->name,
  			git_remote_url(remote)) < 0)
  			goto cleanup;
  
  		if (git_vector_insert(&fetchhead_refs, fetchhead_ref) < 0)
  			goto cleanup;
  	}
  
  	git_fetchhead_write(remote->repo, &fetchhead_refs);
  
  cleanup:
  	for (i = 0; i < fetchhead_refs.length; ++i)
  		git_fetchhead_ref_free(fetchhead_refs.contents[i]);
  
  	git_vector_free(&fetchhead_refs);
  	git_reference_free(head_ref);
  
  	return error;
  }
  
  static int update_tips_for_spec(
  		git_remote *remote,
  		git_refspec *spec,
  		git_vector *refs,
  		const git_signature *signature,
  		const char *log_message)
  {
  	int error = 0, autotag;
  	unsigned int i = 0;
  	git_buf refname = GIT_BUF_INIT;
  	git_oid old;
  	git_odb *odb;
  	git_remote_head *head;
  	git_reference *ref;
  	git_refspec tagspec;
  	git_vector update_heads;
  
  	assert(remote);
  
  	if (git_repository_odb__weakptr(&odb, remote->repo) < 0)
  		return -1;
  
  	if (git_refspec__parse(&tagspec, GIT_REFSPEC_TAGS, true) < 0)
  		return -1;
  
  	/* Make a copy of the transport's refs */
  	if (git_vector_init(&update_heads, 16, NULL) < 0)
  		return -1;
  
  	for (; i < refs->length; ++i) {
  		head = git_vector_get(refs, i);
  		autotag = 0;
  
  		/* Ignore malformed ref names (which also saves us from tag^{} */
  		if (!git_reference_is_valid_name(head->name))
  			continue;
  
  		if (git_refspec_src_matches(spec, head->name) && spec->dst) {
  			if (git_refspec_transform(&refname, spec, head->name) < 0)
  				goto on_error;
  		} else if (remote->download_tags != GIT_REMOTE_DOWNLOAD_TAGS_NONE) {
  
  			if (remote->download_tags != GIT_REMOTE_DOWNLOAD_TAGS_ALL)
  				autotag = 1;
  
  			if (!git_refspec_src_matches(&tagspec, head->name))
  				continue;
  
  			git_buf_clear(&refname);
  			if (git_buf_puts(&refname, head->name) < 0)
  				goto on_error;
  		} else {
  			continue;
  		}
  
  		if (autotag && !git_odb_exists(odb, &head->oid))
  			continue;
  
  		if (!autotag && git_vector_insert(&update_heads, head) < 0)
  			goto on_error;
  
  		error = git_reference_name_to_id(&old, remote->repo, refname.ptr);
  		if (error < 0 && error != GIT_ENOTFOUND)
  			goto on_error;
  
  		if (error == GIT_ENOTFOUND) {
  			memset(&old, 0, GIT_OID_RAWSZ);
  
  			if (autotag && git_vector_insert(&update_heads, head) < 0)
  				goto on_error;
  		}
  
  		if (!git_oid__cmp(&old, &head->oid))
  			continue;
  
  		/* In autotag mode, don't overwrite any locally-existing tags */
  		error = git_reference_create(&ref, remote->repo, refname.ptr, &head->oid, !autotag, 
  				signature, log_message);
  		if (error < 0 && error != GIT_EEXISTS)
  			goto on_error;
  
  		git_reference_free(ref);
  
  		if (remote->callbacks.update_tips != NULL) {
  			if (remote->callbacks.update_tips(refname.ptr, &old, &head->oid, remote->callbacks.payload) < 0)
  				goto on_error;
  		}
  	}
  
  	if (git_remote_update_fetchhead(remote) &&
  	    (error = git_remote_write_fetchhead(remote, spec, &update_heads)) < 0)
  		goto on_error;
  
  	git_vector_free(&update_heads);
  	git_refspec__free(&tagspec);
  	git_buf_free(&refname);
  	return 0;
  
  on_error:
  	git_vector_free(&update_heads);
  	git_refspec__free(&tagspec);
  	git_buf_free(&refname);
  	return -1;
  
  }
  
  /**
   * Iteration over the three vectors, with a pause whenever we find a match
   *
   * On each stop, we store the iteration stat in the inout i,j,k
   * parameters, and return the currently matching passive refspec as
   * well as the head which we matched.
   */
  static int next_head(const git_remote *remote, git_vector *refs,
  		     git_refspec **out_spec, git_remote_head **out_head,
  		     size_t *out_i, size_t *out_j, size_t *out_k)
  {
  	const git_vector *active, *passive;
  	git_remote_head *head;
  	git_refspec *spec, *passive_spec;
  	size_t i, j, k;
  
  	active = &remote->active_refspecs;
  	passive = &remote->passive_refspecs;
  
  	i = *out_i;
  	j = *out_j;
  	k = *out_k;
  
  	for (; i < refs->length; i++) {
  		head = git_vector_get(refs, i);
  
  		if (!git_reference_is_valid_name(head->name))
  			continue;
  
  		for (; j < active->length; j++) {
  			spec = git_vector_get(active, j);
  
  			if (!git_refspec_src_matches(spec, head->name))
  				continue;
  
  			for (; k < passive->length; k++) {
  				passive_spec = git_vector_get(passive, k);
  
  				if (!git_refspec_src_matches(passive_spec, head->name))
  				    continue;
  
  				*out_spec = passive_spec;
  				*out_head = head;
  				*out_i = i;
  				*out_j = j;
  				*out_k = k + 1;
  				return 0;
  
  			}
  			k = 0;
  		}
  		j = 0;
  	}
  
  	return GIT_ITEROVER;
  }
  
  static int opportunistic_updates(const git_remote *remote, git_vector *refs, const git_signature *sig, const char *msg)
  {
  	size_t i, j, k;
  	git_refspec *spec;
  	git_remote_head *head;
  	git_reference *ref;
  	git_buf refname = GIT_BUF_INIT;
  	int error;
  
  	i = j = k = 0;
  
  	while ((error = next_head(remote, refs, &spec, &head, &i, &j, &k)) == 0) {
  		/*
  		 * If we got here, there is a refspec which was used
  		 * for fetching which matches the source of one of the
  		 * passive refspecs, so we should update that
  		 * remote-tracking branch, but not add it to
  		 * FETCH_HEAD
  		 */
  
  		if ((error = git_refspec_transform(&refname, spec, head->name)) < 0)
  			return error;
  
  		error = git_reference_create(&ref, remote->repo, refname.ptr, &head->oid, true, sig, msg);
  		git_buf_free(&refname);
  		git_reference_free(ref);
  
  		if (error < 0)
  			return error;
  	}
  
  	return 0;
  }
  
  int git_remote_update_tips(
  		git_remote *remote,
  		const git_signature *signature,
  		const char *reflog_message)
  {
  	git_refspec *spec, tagspec;
  	git_vector refs;
  	int error;
  	size_t i;
  
  	if (git_refspec__parse(&tagspec, GIT_REFSPEC_TAGS, true) < 0)
  		return -1;
  
  
  	if ((error = ls_to_vector(&refs, remote)) < 0)
  		goto out;
  
  	if (remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {
  		error = update_tips_for_spec(remote, &tagspec, &refs, signature, reflog_message);
  		goto out;
  	}
  
  	git_vector_foreach(&remote->active_refspecs, i, spec) {
  		if (spec->push)
  			continue;
  
  		if ((error = update_tips_for_spec(remote, spec, &refs, signature, reflog_message)) < 0)
  			goto out;
  	}
  
  	/* only try to do opportunisitic updates if the refpec lists differ */
  	if (remote->passed_refspecs)
  		error = opportunistic_updates(remote, &refs, signature, reflog_message);
  
  out:
  	git_vector_free(&refs);
  	git_refspec__free(&tagspec);
  	return error;
  }
  
  int git_remote_connected(const git_remote *remote)
  {
  	assert(remote);
  
  	if (!remote->transport || !remote->transport->is_connected)
  		return 0;
  
  	/* Ask the transport if it's connected. */
  	return remote->transport->is_connected(remote->transport);
  }
  
  void git_remote_stop(git_remote *remote)
  {
  	assert(remote);
  
  	if (remote->transport && remote->transport->cancel)
  		remote->transport->cancel(remote->transport);
  }
  
  void git_remote_disconnect(git_remote *remote)
  {
  	assert(remote);
  
  	if (git_remote_connected(remote))
  		remote->transport->close(remote->transport);
  }
  
  void git_remote_free(git_remote *remote)
  {
  	if (remote == NULL)
  		return;
  
  	if (remote->transport != NULL) {
  		git_remote_disconnect(remote);
  
  		remote->transport->free(remote->transport);
  		remote->transport = NULL;
  	}
  
  	git_vector_free(&remote->refs);
  
  	free_refspecs(&remote->refspecs);
  	git_vector_free(&remote->refspecs);
  
  	free_refspecs(&remote->active_refspecs);
  	git_vector_free(&remote->active_refspecs);
  
  	free_refspecs(&remote->passive_refspecs);
  	git_vector_free(&remote->passive_refspecs);
  
  	git__free(remote->url);
  	git__free(remote->pushurl);
  	git__free(remote->name);
  	git__free(remote);
  }
  
  static int remote_list_cb(const git_config_entry *entry, void *payload)
  {
  	git_vector *list = payload;
  	const char *name = entry->name + strlen("remote.");
  	size_t namelen = strlen(name);
  	char *remote_name;
  
  	/* we know name matches "remote.<stuff>.(push)?url" */
  
  	if (!strcmp(&name[namelen - 4], ".url"))
  		remote_name = git__strndup(name, namelen - 4); /* strip ".url" */
  	else
  		remote_name = git__strndup(name, namelen - 8); /* strip ".pushurl" */
  	GITERR_CHECK_ALLOC(remote_name);
  
  	return git_vector_insert(list, remote_name);
  }
  
  int git_remote_list(git_strarray *remotes_list, git_repository *repo)
  {
  	int error;
  	git_config *cfg;
  	git_vector list = GIT_VECTOR_INIT;
  
  	if ((error = git_repository_config__weakptr(&cfg, repo)) < 0)
  		return error;
  
  	if ((error = git_vector_init(&list, 4, git__strcmp_cb)) < 0)
  		return error;
  
  	error = git_config_foreach_match(
  		cfg, "^remote\\..*\\.(push)?url$", remote_list_cb, &list);
  
  	if (error < 0) {
  		git_vector_free_deep(&list);
  		return error;
  	}
  
  	git_vector_uniq(&list, git__free);
  
  	remotes_list->strings =
  		(char **)git_vector_detach(&remotes_list->count, NULL, &list);
  
  	return 0;
  }
  
  int git_remote_set_callbacks(git_remote *remote, const git_remote_callbacks *callbacks)
  {
  	assert(remote && callbacks);
  
  	GITERR_CHECK_VERSION(callbacks, GIT_REMOTE_CALLBACKS_VERSION, "git_remote_callbacks");
  
  	memcpy(&remote->callbacks, callbacks, sizeof(git_remote_callbacks));
  
  	if (remote->transport && remote->transport->set_callbacks)
  		return remote->transport->set_callbacks(remote->transport,
  			remote->callbacks.sideband_progress,
  			NULL,
  			remote->callbacks.certificate_check,
  			remote->callbacks.payload);
  
  	return 0;
  }
  
  const git_remote_callbacks *git_remote_get_callbacks(git_remote *remote)
  {
  	assert(remote);
  
  	return &remote->callbacks;
  }
  
  int git_remote_set_transport(
  	git_remote *remote,
  	git_transport_cb transport_cb,
  	void *payload)
  {
  	assert(remote);
  
  	if (remote->transport) {
  		giterr_set(GITERR_NET, "A transport is already bound to this remote");
  		return -1;
  	}
  
  	remote->transport_cb = transport_cb;
  	remote->transport_cb_payload = payload;
  	return 0;
  }
  
  const git_transfer_progress* git_remote_stats(git_remote *remote)
  {
  	assert(remote);
  	return &remote->stats;
  }
  
  git_remote_autotag_option_t git_remote_autotag(const git_remote *remote)
  {
  	return remote->download_tags;
  }
  
  void git_remote_set_autotag(git_remote *remote, git_remote_autotag_option_t value)
  {
  	remote->download_tags = value;
  }
  
  static int rename_remote_config_section(
  	git_repository *repo,
  	const char *old_name,
  	const char *new_name)
  {
  	git_buf old_section_name = GIT_BUF_INIT,
  		new_section_name = GIT_BUF_INIT;
  	int error = -1;
  
  	if (git_buf_printf(&old_section_name, "remote.%s", old_name) < 0)
  		goto cleanup;
  
  	if (new_name &&
  		(git_buf_printf(&new_section_name, "remote.%s", new_name) < 0))
  			goto cleanup;
  
  	error = git_config_rename_section(
  		repo,
  		git_buf_cstr(&old_section_name),
  		new_name ? git_buf_cstr(&new_section_name) : NULL);
  
  cleanup:
  	git_buf_free(&old_section_name);
  	git_buf_free(&new_section_name);
  
  	return error;
  }
  
  struct update_data {
  	git_config *config;
  	const char *old_remote_name;
  	const char *new_remote_name;
  };
  
  static int update_config_entries_cb(
  	const git_config_entry *entry,
  	void *payload)
  {
  	struct update_data *data = (struct update_data *)payload;
  
  	if (strcmp(entry->value, data->old_remote_name))
  		return 0;
  
  	return git_config_set_string(
  		data->config, entry->name, data->new_remote_name);
  }
  
  static int update_branch_remote_config_entry(
  	git_repository *repo,
  	const char *old_name,
  	const char *new_name)
  {
  	int error;
  	struct update_data data = { NULL };
  
  	if ((error = git_repository_config__weakptr(&data.config, repo)) < 0)
  		return error;
  
  	data.old_remote_name = old_name;
  	data.new_remote_name = new_name;
  
  	return git_config_foreach_match(
  		data.config, "branch\\..+\\.remote", update_config_entries_cb, &data);
  }
  
  static int rename_one_remote_reference(
  	git_reference *reference_in,
  	const char *old_remote_name,
  	const char *new_remote_name)
  {
  	int error;
  	git_reference *ref = NULL, *dummy = NULL;
  	git_buf namespace = GIT_BUF_INIT, old_namespace = GIT_BUF_INIT;
  	git_buf new_name = GIT_BUF_INIT;
  	git_buf log_message = GIT_BUF_INIT;
  	size_t pfx_len;
  	const char *target;
  
  	if ((error = git_buf_printf(&namespace, GIT_REFS_REMOTES_DIR "%s/", new_remote_name)) < 0)
  		return error;
  
  	pfx_len = strlen(GIT_REFS_REMOTES_DIR) + strlen(old_remote_name) + 1;
  	git_buf_puts(&new_name, namespace.ptr);
  	if ((error = git_buf_puts(&new_name, git_reference_name(reference_in) + pfx_len)) < 0)
  		goto cleanup;
  
  	if ((error = git_buf_printf(&log_message,
  					"renamed remote %s to %s",
  					old_remote_name, new_remote_name)) < 0)
  		goto cleanup;
  
  	if ((error = git_reference_rename(&ref, reference_in, git_buf_cstr(&new_name), 1,
  					  NULL, git_buf_cstr(&log_message))) < 0)
  		goto cleanup;
  
  	if (git_reference_type(ref) != GIT_REF_SYMBOLIC)
  		goto cleanup;
  
  	/* Handle refs like origin/HEAD -> origin/master */
  	target = git_reference_symbolic_target(ref);
  	if ((error = git_buf_printf(&old_namespace, GIT_REFS_REMOTES_DIR "%s/", old_remote_name)) < 0)
  		goto cleanup;
  
  	if (git__prefixcmp(target, old_namespace.ptr))
  		goto cleanup;
  
  	git_buf_clear(&new_name);
  	git_buf_puts(&new_name, namespace.ptr);
  	if ((error = git_buf_puts(&new_name, target + pfx_len)) < 0)
  		goto cleanup;
  
  	error = git_reference_symbolic_set_target(&dummy, ref, git_buf_cstr(&new_name),
  						  NULL, git_buf_cstr(&log_message));
  
  	git_reference_free(dummy);
  
  cleanup:
  	git_reference_free(reference_in);
  	git_reference_free(ref);
  	git_buf_free(&namespace);
  	git_buf_free(&old_namespace);
  	git_buf_free(&new_name);
  	git_buf_free(&log_message);
  	return error;
  }
  
  static int rename_remote_references(
  	git_repository *repo,
  	const char *old_name,
  	const char *new_name)
  {
  	int error;
  	git_buf buf = GIT_BUF_INIT;
  	git_reference *ref;
  	git_reference_iterator *iter;
  
  	if ((error = git_buf_printf(&buf, GIT_REFS_REMOTES_DIR "%s/*", old_name)) < 0)
  		return error;
  
  	error = git_reference_iterator_glob_new(&iter, repo, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  
  	if (error < 0)
  		return error;
  
  	while ((error = git_reference_next(&ref, iter)) == 0) {
  		if ((error = rename_one_remote_reference(ref, old_name, new_name)) < 0)
  			break;
  	}
  
  	git_reference_iterator_free(iter);
  
  	return (error == GIT_ITEROVER) ? 0 : error;
  }
  
  static int rename_fetch_refspecs(git_vector *problems, git_remote *remote, const char *new_name)
  {
  	git_config *config;
  	git_buf base = GIT_BUF_INIT, var = GIT_BUF_INIT, val = GIT_BUF_INIT;
  	const git_refspec *spec;
  	size_t i;
  	int error = 0;
  
  	if ((error = git_repository_config__weakptr(&config, remote->repo)) < 0)
  		return error;
  
  	if ((error = git_vector_init(problems, 1, NULL)) < 0)
  		return error;
  
  	if ((error = git_buf_printf(
  			&base, "+refs/heads/*:refs/remotes/%s/*", remote->name)) < 0)
  		return error;
  
  	git_vector_foreach(&remote->refspecs, i, spec) {
  		if (spec->push)
  			continue;
  
  		/* Does the dst part of the refspec follow the expected format? */
  		if (strcmp(git_buf_cstr(&base), spec->string)) {
  			char *dup;
  
  			dup = git__strdup(spec->string);
  			GITERR_CHECK_ALLOC(dup);
  
  			if ((error = git_vector_insert(problems, dup)) < 0)
  				break;
  
  			continue;
  		}
  
  		/* If we do want to move it to the new section */
  
  		git_buf_clear(&val);
  		git_buf_clear(&var);
  
  		if (git_buf_printf(
  				&val, "+refs/heads/*:refs/remotes/%s/*", new_name) < 0 ||
  			git_buf_printf(&var, "remote.%s.fetch", new_name) < 0)
  		{
  			error = -1;
  			break;
  		}
  
  		if ((error = git_config_set_string(
  				config, git_buf_cstr(&var), git_buf_cstr(&val))) < 0)
  			break;
  	}
  
  	git_buf_free(&base);
  	git_buf_free(&var);
  	git_buf_free(&val);
  
  	if (error < 0) {
  		char *str;
  		git_vector_foreach(problems, i, str)
  			git__free(str);
  
  		git_vector_free(problems);
  	}
  
  	return error;
  }
  
  int git_remote_rename(git_strarray *out, git_repository *repo, const char *name, const char *new_name)
  {
  	int error;
  	git_vector problem_refspecs = GIT_VECTOR_INIT;
  	git_remote *remote = NULL;
  
  	assert(out && repo && name && new_name);
  
  	if ((error = git_remote_load(&remote, repo, name)) < 0)
  		return -1;
  
  	if ((error = ensure_remote_name_is_valid(new_name)) < 0)
  		goto cleanup;
  
  	if ((error = ensure_remote_doesnot_exist(repo, new_name)) < 0)
  		goto cleanup;
  
  	if ((error = rename_remote_config_section(repo, name, new_name)) < 0)
  		goto cleanup;
  
  	if ((error = update_branch_remote_config_entry(repo, name, new_name)) < 0)
  		goto cleanup;
  
  	if ((error = rename_remote_references(repo, name, new_name)) < 0)
  		goto cleanup;
  
  	if ((error = rename_fetch_refspecs(&problem_refspecs, remote, new_name)) < 0)
  		goto cleanup;
  
  	out->count = problem_refspecs.length;
  	out->strings = (char **) problem_refspecs.contents;
  
  cleanup:
  	if (error < 0)
  		git_vector_free(&problem_refspecs);
  
  	git_remote_free(remote);
  	return error;
  }
  
  int git_remote_update_fetchhead(git_remote *remote)
  {
  	return (remote->update_fetchhead != 0);
  }
  
  void git_remote_set_update_fetchhead(git_remote *remote, int value)
  {
  	remote->update_fetchhead = (value != 0);
  }
  
  int git_remote_is_valid_name(
  	const char *remote_name)
  {
  	git_buf buf = GIT_BUF_INIT;
  	git_refspec refspec;
  	int error = -1;
  
  	if (!remote_name || *remote_name == '\0')
  		return 0;
  
  	git_buf_printf(&buf, "refs/heads/test:refs/remotes/%s/test", remote_name);
  	error = git_refspec__parse(&refspec, git_buf_cstr(&buf), true);
  
  	git_buf_free(&buf);
  	git_refspec__free(&refspec);
  
  	giterr_clear();
  	return error == 0;
  }
  
  git_refspec *git_remote__matching_refspec(git_remote *remote, const char *refname)
  {
  	git_refspec *spec;
  	size_t i;
  
  	git_vector_foreach(&remote->active_refspecs, i, spec) {
  		if (spec->push)
  			continue;
  
  		if (git_refspec_src_matches(spec, refname))
  			return spec;
  	}
  
  	return NULL;
  }
  
  git_refspec *git_remote__matching_dst_refspec(git_remote *remote, const char *refname)
  {
  	git_refspec *spec;
  	size_t i;
  
  	git_vector_foreach(&remote->active_refspecs, i, spec) {
  		if (spec->push)
  			continue;
  
  		if (git_refspec_dst_matches(spec, refname))
  			return spec;
  	}
  
  	return NULL;
  }
  
  void git_remote_clear_refspecs(git_remote *remote)
  {
  	git_refspec *spec;
  	size_t i;
  
  	git_vector_foreach(&remote->refspecs, i, spec) {
  		git_refspec__free(spec);
  		git__free(spec);
  	}
  	git_vector_clear(&remote->refspecs);
  }
  
  int git_remote_add_fetch(git_remote *remote, const char *refspec)
  {
  	return add_refspec(remote, refspec, true);
  }
  
  int git_remote_add_push(git_remote *remote, const char *refspec)
  {
  	return add_refspec(remote, refspec, false);
  }
  
  static int set_refspecs(git_remote *remote, git_strarray *array, int push)
  {
  	git_vector *vec = &remote->refspecs;
  	git_refspec *spec;
  	size_t i;
  
  	/* Start by removing any refspecs of the same type */
  	for (i = 0; i < vec->length; i++) {
  		spec = git_vector_get(vec, i);
  		if (spec->push != push)
  			continue;
  
  		git_refspec__free(spec);
  		git__free(spec);
  		git_vector_remove(vec, i);
  		i--;
  	}
  
  	/* And now we add the new ones */
  
  	for (i = 0; i < array->count; i++) {
  		if (add_refspec(remote, array->strings[i], !push) < 0)
  			return -1;
  	}
  
  	return 0;
  }
  
  int git_remote_set_fetch_refspecs(git_remote *remote, git_strarray *array)
  {
  	return set_refspecs(remote, array, false);
  }
  
  int git_remote_set_push_refspecs(git_remote *remote, git_strarray *array)
  {
  	return set_refspecs(remote, array, true);
  }
  
  static int copy_refspecs(git_strarray *array, const git_remote *remote, unsigned int push)
  {
  	size_t i;
  	git_vector refspecs;
  	git_refspec *spec;
  	char *dup;
  
  	if (git_vector_init(&refspecs, remote->refspecs.length, NULL) < 0)
  		return -1;
  
  	git_vector_foreach(&remote->refspecs, i, spec) {
  		if (spec->push != push)
  			continue;
  
  		if ((dup = git__strdup(spec->string)) == NULL)
  			goto on_error;
  
  		if (git_vector_insert(&refspecs, dup) < 0) {
  			git__free(dup);
  			goto on_error;
  		}
  	}
  
  	array->strings = (char **)refspecs.contents;
  	array->count = refspecs.length;
  
  	return 0;
  
  on_error:
  	git_vector_free_deep(&refspecs);
  
  	return -1;
  }
  
  int git_remote_get_fetch_refspecs(git_strarray *array, const git_remote *remote)
  {
  	return copy_refspecs(array, remote, false);
  }
  
  int git_remote_get_push_refspecs(git_strarray *array, const git_remote *remote)
  {
  	return copy_refspecs(array, remote, true);
  }
  
  size_t git_remote_refspec_count(const git_remote *remote)
  {
  	return remote->refspecs.length;
  }
  
  const git_refspec *git_remote_get_refspec(const git_remote *remote, size_t n)
  {
  	return git_vector_get(&remote->refspecs, n);
  }
  
  int git_remote_init_callbacks(git_remote_callbacks *opts, unsigned int version)
  {
  	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
  		opts, version, git_remote_callbacks, GIT_REMOTE_CALLBACKS_INIT);
  	return 0;
  }
  
  /* asserts a branch.<foo>.remote format */
  static const char *name_offset(size_t *len_out, const char *name)
  {
  	size_t prefix_len;
  	const char *dot;
  
  	prefix_len = strlen("remote.");
  	dot = strchr(name + prefix_len, '.');
  
  	assert(dot);
  
  	*len_out = dot - name - prefix_len;
  	return name + prefix_len;
  }
  
  static int remove_branch_config_related_entries(
  	git_repository *repo,
  	const char *remote_name)
  {
  	int error;
  	git_config *config;
  	git_config_entry *entry;
  	git_config_iterator *iter;
  	git_buf buf = GIT_BUF_INIT;
  
  	if ((error = git_repository_config__weakptr(&config, repo)) < 0)
  		return error;
  
  	if ((error = git_config_iterator_glob_new(&iter, config, "branch\\..+\\.remote")) < 0)
  		return error;
  
  	/* find any branches with us as upstream and remove that config */
  	while ((error = git_config_next(&entry, iter)) == 0) {
  		const char *branch;
  		size_t branch_len;
  
  		if (strcmp(remote_name, entry->value))
  			continue;
  
  		branch = name_offset(&branch_len, entry->name);
  
  		git_buf_clear(&buf);
  		if (git_buf_printf(&buf, "branch.%.*s.merge", (int)branch_len, branch) < 0)
  			break;
  
  		if ((error = git_config_delete_entry(config, git_buf_cstr(&buf))) < 0)
  			break;
  
  		git_buf_clear(&buf);
  		if (git_buf_printf(&buf, "branch.%.*s.remote", (int)branch_len, branch) < 0)
  			break;
  
  		if ((error = git_config_delete_entry(config, git_buf_cstr(&buf))) < 0)
  			break;
  	}
  
  	if (error == GIT_ITEROVER)
  		error = 0;
  
  	git_buf_free(&buf);
  	git_config_iterator_free(iter);
  	return error;
  }
  
  static int remove_refs(git_repository *repo, const git_refspec *spec)
  {
  	git_reference_iterator *iter = NULL;
  	git_vector refs;
  	const char *name;
  	char *dup;
  	int error;
  	size_t i;
  
  	if ((error = git_vector_init(&refs, 8, NULL)) < 0)
  		return error;
  
  	if ((error = git_reference_iterator_new(&iter, repo)) < 0)
  		goto cleanup;
  
  	while ((error = git_reference_next_name(&name, iter)) == 0) {
  		if (!git_refspec_dst_matches(spec, name))
  			continue;
  
  		dup = git__strdup(name);
  		if (!dup) {
  			error = -1;
  			goto cleanup;
  		}
  
  		if ((error = git_vector_insert(&refs, dup)) < 0)
  			goto cleanup;
  	}
  	if (error == GIT_ITEROVER)
  		error = 0;
  	if (error < 0)
  		goto cleanup;
  
  	git_vector_foreach(&refs, i, name) {
  		if ((error = git_reference_remove(repo, name)) < 0)
  			break;
  	}
  
  cleanup:
  	git_reference_iterator_free(iter);
  	git_vector_foreach(&refs, i, dup) {
  		git__free(dup);
  	}
  	git_vector_free(&refs);
  	return error;
  }
  
  static int remove_remote_tracking(git_repository *repo, const char *remote_name)
  {
  	git_remote *remote;
  	int error;
  	size_t i, count;
  
  	/* we want to use what's on the config, regardless of changes to the instance in memory */
  	if ((error = git_remote_load(&remote, repo, remote_name)) < 0)
  		return error;
  
  	count = git_remote_refspec_count(remote);
  	for (i = 0; i < count; i++) {
  		const git_refspec *refspec = git_remote_get_refspec(remote, i);
  
  		/* shouldn't ever actually happen */
  		if (refspec == NULL)
  			continue;
  
  		if ((error = remove_refs(repo, refspec)) < 0)
  			break;
  	}
  
  	git_remote_free(remote);
  	return error;
  }
  
  int git_remote_delete(git_repository *repo, const char *name)
  {
  	int error;
  
  	assert(repo && name);
  
  	if ((error = remove_branch_config_related_entries(repo, name)) < 0 ||
  	    (error = remove_remote_tracking(repo, name)) < 0 ||
  	    (error = rename_remote_config_section(repo, name, NULL)) < 0)
  		return error;
  
  	return 0;
  }
  
  int git_remote_default_branch(git_buf *out, git_remote *remote)
  {
  	const git_remote_head **heads;
  	const git_remote_head *guess = NULL;
  	const git_oid *head_id;
  	size_t heads_len, i;
  	int error;
  
  	assert(out);
  
  	if ((error = git_remote_ls(&heads, &heads_len, remote)) < 0)
  		return error;
  
  	if (heads_len == 0)
  		return GIT_ENOTFOUND;
  
  	if (strcmp(heads[0]->name, GIT_HEAD_FILE))
  		return GIT_ENOTFOUND;
  
  	git_buf_sanitize(out);
  	/* the first one must be HEAD so if that has the symref info, we're done */
  	if (heads[0]->symref_target)
  		return git_buf_puts(out, heads[0]->symref_target);
  
  	/*
  	 * If there's no symref information, we have to look over them
  	 * and guess. We return the first match unless the master
  	 * branch is a candidate. Then we return the master branch.
  	 */
  	head_id = &heads[0]->oid;
  
  	for (i = 1; i < heads_len; i++) {
  		if (git_oid_cmp(head_id, &heads[i]->oid))
  			continue;
  
  		if (git__prefixcmp(heads[i]->name, GIT_REFS_HEADS_DIR))
  			continue;
  
  		if (!guess) {
  			guess = heads[i];
  			continue;
  		}
  
  		if (!git__strcmp(GIT_REFS_HEADS_MASTER_FILE, heads[i]->name)) {
  			guess = heads[i];
  			break;
  		}
  	}
  
  	if (!guess)
  		return GIT_ENOTFOUND;
  
  	return git_buf_puts(out, guess->name);
  }
  

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