thodg/libgit2/src/remote.c

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• Hash : 85e1eded
  Author :
  Date : 2013-07-15T16:31:25
  

  Add `git_remote_owner`

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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 "config.h"
  #include "repository.h"
  #include "remote.h"
  #include "fetch.h"
  #include "refs.h"
  #include "refspec.h"
  #include "fetchhead.h"
  
  #include <regex.h>
  
  static int add_refspec(git_remote *remote, 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(&remote->refspecs, spec) < 0) {
  		git_refspec__free(spec);
  		git__free(spec);
  		return -1;
  	}
  
  	return 0;
  }
  
  static int download_tags_value(git_remote *remote, git_config *cfg)
  {
  	const char *val;
  	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_get_string(&val, cfg, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  	if (!error && !strcmp(val, "--no-tags"))
  		remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_NONE;
  	else if (!error && !strcmp(val, "--tags"))
  		remote->download_tags = GIT_REMOTE_DOWNLOAD_TAGS_ALL;
  
  	if (error == GIT_ENOTFOUND) {
  		giterr_clear();
  		error = 0;
  	}
  
  	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);
  		error = GIT_EINVALIDSPEC;
  	}
  
  	return error;
  }
  
  static int create_internal(git_remote **out, git_repository *repo, const char *name, const char *url, const char *fetch)
  {
  	git_remote *remote;
  	git_buf 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->check_cert = 1;
  	remote->update_fetchhead = 1;
  
  	if (git_vector_init(&remote->refs, 32, NULL) < 0)
  		goto on_error;
  
  	remote->url = git__strdup(url);
  	GITERR_CHECK_ALLOC(remote->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);
  	return 0;
  
  on_error:
  	git_remote_free(remote);
  	git_buf_free(&fetchbuf);
  	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_inmemory(git_remote **out, git_repository *repo, const char *fetch, const char *url)
  {
  	int error;
  	git_remote *remote;
  
  	if ((error = create_internal(&remote, repo, NULL, url, fetch)) < 0)
  		return error;
  
  	*out = remote;
  	return 0;
  }
  
  struct refspec_cb_data {
  	git_remote *remote;
  	int fetch;
  };
  
  static int refspec_cb(const git_config_entry *entry, void *payload)
  {
  	const struct refspec_cb_data *data = (struct refspec_cb_data *)payload;
  
  	return add_refspec(data->remote, entry->value, data->fetch);
  }
  
  static int get_optional_config(
  	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(config, key, NULL, cb, payload);
  	else
  		error = git_config_get_string(payload, config, key);
  
  	if (error == GIT_ENOTFOUND) {
  		giterr_clear();
  		error = 0;
  	}
  
  	if (error < 0)
  		error = -1;
  
  	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;
  
  	assert(out && repo && name);
  
  	if ((error = ensure_remote_name_is_valid(name)) < 0)
  		return error;
  
  	if (git_repository_config__weakptr(&config, repo) < 0)
  		return -1;
  
  	remote = git__malloc(sizeof(git_remote));
  	GITERR_CHECK_ALLOC(remote);
  
  	memset(remote, 0x0, sizeof(git_remote));
  	remote->check_cert = 1;
  	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))) {
  		error = -1;
  		goto cleanup;
  	}
  
  	if (git_buf_printf(&buf, "remote.%s.url", name) < 0) {
  		error = -1;
  		goto cleanup;
  	}
  
  	if ((error = git_config_get_string(&val, config, git_buf_cstr(&buf))) < 0)
  		goto cleanup;
  
  	if (strlen(val) == 0) {
  		giterr_set(GITERR_INVALID, "Malformed remote '%s' - missing URL", name);
  		error = -1;
  		goto cleanup;
  	}
  
  	remote->repo = repo;
  	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(config, &buf, NULL, (void *)&val)) < 0)
  		goto cleanup;
  
  	if (val) {
  		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(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(config, &buf, refspec_cb, &data)) < 0)
  		goto cleanup;
  
  	if (download_tags_value(remote, config) < 0)
  		goto cleanup;
  
  	*out = remote;
  
  cleanup:
  	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;
  	int push;
  	const char *dir;
  	size_t i;
  	int error = 0;
  
  	push = direction == GIT_DIRECTION_PUSH;
  	dir = push ? "push" : "fetch";
  
  	if (git_buf_printf(&name, "remote.%s.%s", remote->name, dir) < 0)
  		return -1;
  
  	/* Clear out the existing config */
  	while (!error)
  		error = git_config_delete_entry(config, git_buf_cstr(&name));
  
  	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;
  
  		if ((error = git_config_set_multivar(
  				config, git_buf_cstr(&name), "", 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 *config;
  	const char *tagopt = NULL;
  	git_buf buf = GIT_BUF_INIT;
  
  	assert(remote);
  
  	if (!remote->name) {
  		giterr_set(GITERR_INVALID, "Can't save an in-memory remote.");
  		return GIT_EINVALIDSPEC;
  	}
  
  	if ((error = ensure_remote_name_is_valid(remote->name)) < 0)
  		return error;
  
  	if (git_repository_config__weakptr(&config, remote->repo) < 0)
  		return -1;
  
  	if (git_buf_printf(&buf, "remote.%s.url", remote->name) < 0)
  		return -1;
  
  	if (git_config_set_string(config, git_buf_cstr(&buf), remote->url) < 0) {
  		git_buf_free(&buf);
  		return -1;
  	}
  
  	git_buf_clear(&buf);
  	if (git_buf_printf(&buf, "remote.%s.pushurl", remote->name) < 0)
  		return -1;
  
  	if (remote->pushurl) {
  		if (git_config_set_string(config, git_buf_cstr(&buf), remote->pushurl) < 0) {
  			git_buf_free(&buf);
  			return -1;
  		}
  	} else {
  		int error = git_config_delete_entry(config, git_buf_cstr(&buf));
  		if (error == GIT_ENOTFOUND) {
  			error = 0;
  			giterr_clear();
  		}
  		if (error < 0) {
  			git_buf_free(&buf);
  			return -1;
  		}
  	}
  
  	if (update_config_refspec(remote, config, GIT_DIRECTION_FETCH) < 0)
  		goto on_error;
  
  	if (update_config_refspec(remote, config, GIT_DIRECTION_PUSH) < 0)
  		goto on_error;
  
  	/*
  	 * 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 (git_buf_printf(&buf, "remote.%s.tagopt", remote->name) < 0)
  		goto on_error;
  
  	error = git_config_get_string(&tagopt, config, git_buf_cstr(&buf));
  	if (error < 0 && error != GIT_ENOTFOUND)
  		goto on_error;
  
  	if (remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {
  		if (git_config_set_string(config, git_buf_cstr(&buf), "--tags") < 0)
  			goto on_error;
  	} else if (remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_NONE) {
  		if (git_config_set_string(config, git_buf_cstr(&buf), "--no-tags") < 0)
  			goto on_error;
  	} else if (tagopt) {
  		if (git_config_delete_entry(config, git_buf_cstr(&buf)) < 0)
  			goto on_error;
  	}
  
  	git_buf_free(&buf);
  
  	return 0;
  
  on_error:
  	git_buf_free(&buf);
  	return -1;
  }
  
  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);
  
  	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;
  
  	assert(remote);
  
  	t = remote->transport;
  
  	url = git_remote__urlfordirection(remote, direction);
  	if (url == NULL )
  		return -1;
  
  	/* A transport could have been supplied in advance with
  	 * git_remote_set_transport */
  	if (!t && git_transport_new(&t, remote, url) < 0)
  		return -1;
  
  	if (t->set_callbacks &&
  		t->set_callbacks(t, remote->callbacks.progress, NULL, remote->callbacks.payload) < 0)
  		goto on_error;
  
  	if (!remote->check_cert)
  		flags |= GIT_TRANSPORTFLAGS_NO_CHECK_CERT;
  
  	if (t->connect(t, url, remote->cred_acquire_cb, remote->cred_acquire_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 -1;
  }
  
  int git_remote_ls(git_remote *remote, git_headlist_cb list_cb, void *payload)
  {
  	assert(remote);
  
  	return remote->transport->ls(remote->transport, list_cb, payload);
  }
  
  int git_remote__get_http_proxy(git_remote *remote, bool use_ssl, char **proxy_url)
  {
  	git_config *cfg;
  	const char *val;
  
  	assert(remote);
  
  	if (!proxy_url || !remote->repo)
  		return -1;
  
  	*proxy_url = NULL;
  
  	if (git_repository_config__weakptr(&cfg, remote->repo) < 0)
  		return -1;
  
  	/* Go through the possible sources for proxy configuration, from most specific
  	 * to least specific. */
  
  	/* remote.<name>.proxy config setting */
  	if (remote->name && 0 != *(remote->name)) {
  		git_buf buf = GIT_BUF_INIT;
  
  		if (git_buf_printf(&buf, "remote.%s.proxy", remote->name) < 0)
  			return -1;
  
  		if (!git_config_get_string(&val, cfg, git_buf_cstr(&buf)) &&
  			val && ('\0' != *val)) {
  			git_buf_free(&buf);
  
  			*proxy_url = git__strdup(val);
  			GITERR_CHECK_ALLOC(*proxy_url);
  			return 0;
  		}
  
  		git_buf_free(&buf);
  	}
  
  	/* http.proxy config setting */
  	if (!git_config_get_string(&val, cfg, "http.proxy") &&
  		val && ('\0' != *val)) {
  		*proxy_url = git__strdup(val);
  		GITERR_CHECK_ALLOC(*proxy_url);
  		return 0;
  	}
  
  	/* HTTP_PROXY / HTTPS_PROXY environment variables */
  	val = use_ssl ? getenv("HTTPS_PROXY") : getenv("HTTP_PROXY");
  
  	if (val && ('\0' != *val)) {
  		*proxy_url = git__strdup(val);
  		GITERR_CHECK_ALLOC(*proxy_url);
  		return 0;
  	}
  
  	return 0;
  }
  
  static int store_refs(git_remote_head *head, void *payload)
  {
  	git_vector *refs = (git_vector *)payload;
  
  	return git_vector_insert(refs, head);
  }
  
  static int dwim_refspecs(git_vector *refspecs, git_vector *refs)
  {
  	git_buf buf = GIT_BUF_INIT;
  	git_refspec *spec;
  	size_t i, j, pos;
  	git_remote_head key;
  
  	const char* formatters[] = {
  		GIT_REFS_DIR "%s",
  		GIT_REFS_TAGS_DIR "%s",
  		GIT_REFS_HEADS_DIR "%s",
  		NULL
  	};
  
  	git_vector_foreach(refspecs, i, spec) {
  		if (spec->dwim)
  			continue;
  
  		/* shorthand on the lhs */
  		if (git__prefixcmp(spec->src, GIT_REFS_DIR)) {
  			for (j = 0; formatters[j]; j++) {
  				git_buf_clear(&buf);
  				if (git_buf_printf(&buf, formatters[j], spec->src) < 0)
  					return -1;
  
  				key.name = (char *) git_buf_cstr(&buf);
  				if (!git_vector_search(&pos, refs, &key)) {
  					/* we found something to match the shorthand, set src to that */
  					git__free(spec->src);
  					spec->src = git_buf_detach(&buf);
  				}
  			}
  		}
  
  		if (spec->dst && git__prefixcmp(spec->dst, GIT_REFS_DIR)) {
  			/* if it starts with "remotes" then we just prepend "refs/" */
  			if (!git__prefixcmp(spec->dst, "remotes/")) {
  				git_buf_puts(&buf, GIT_REFS_DIR);
  			} else {
  				git_buf_puts(&buf, GIT_REFS_HEADS_DIR);
  			}
  
  			if (git_buf_puts(&buf, spec->dst) < 0)
  				return -1;
  
  			git__free(spec->dst);
  			spec->dst = git_buf_detach(&buf);
  		}
  
  		spec->dwim = 1;
  	}
  
  	git_buf_free(&buf);
  	return 0;
  }
  
  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);
  }
  
  int git_remote_download(
  		git_remote *remote,
  		git_transfer_progress_callback progress_cb,
  		void *progress_payload)
  {
  	int error;
  	git_vector refs;
  
  	assert(remote);
  
  	if (git_vector_init(&refs, 16, remote_head_cmp) < 0)
  		return -1;
  
  	if (git_remote_ls(remote, store_refs, &refs) < 0) {
  		return -1;
  	}
  
  	error = dwim_refspecs(&remote->refspecs, &refs);
  	git_vector_free(&refs);
  	if (error < 0)
  		return -1;
  
  	if ((error = git_fetch_negotiate(remote)) < 0)
  		return error;
  
  	return git_fetch_download_pack(remote, progress_cb, progress_payload);
  }
  
  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_refspec *spec, git_vector *update_heads, git_reference *ref)
  {
  	git_reference *resolved_ref = NULL;
  	git_reference *tracking_ref = NULL;
  	git_buf remote_name = GIT_BUF_INIT;
  	int error = 0;
  
  	assert(out && spec && ref);
  
  	*out = NULL;
  
  	if ((error = git_reference_resolve(&resolved_ref, ref)) < 0 ||
  		(!git_reference_is_branch(resolved_ref)) ||
  		(error = git_branch_upstream(&tracking_ref, resolved_ref)) < 0 ||
  		(error = git_refspec_transform_l(&remote_name, spec, git_reference_name(tracking_ref))) < 0) {
  		/* Not an error if HEAD is orphaned or no tracking branch */
  		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(tracking_ref);
  	git_reference_free(resolved_ref);
  	git_buf_free(&remote_name);
  	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, 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)
  {
  	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_r(&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 (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 (!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);
  		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;
  
  }
  
  int git_remote_update_tips(git_remote *remote)
  {
  	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 (git_vector_init(&refs, 16, NULL) < 0)
  		return -1;
  
  	if ((error = git_remote_ls(remote, store_refs, &refs)) < 0)
  		goto out;
  
  	if (remote->download_tags == GIT_REMOTE_DOWNLOAD_TAGS_ALL) {
  		error = update_tips_for_spec(remote, &tagspec, &refs);
  		goto out;
  	}
  
  	git_vector_foreach(&remote->refspecs, i, spec) {
  		if (spec->push)
  			continue;
  
  		if ((error = update_tips_for_spec(remote, spec, &refs)) < 0)
  			goto out;
  	}
  
  out:
  	git_refspec__free(&tagspec);
  	git_vector_free(&refs);
  	return error;
  }
  
  int git_remote_connected(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)
  {
  	git_refspec *spec;
  	size_t i;
  
  	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);
  
  	git_vector_foreach(&remote->refspecs, i, spec) {
  		git_refspec__free(spec);
  		git__free(spec);
  	}
  	git_vector_free(&remote->refspecs);
  
  	git__free(remote->url);
  	git__free(remote->pushurl);
  	git__free(remote->name);
  	git__free(remote);
  }
  
  struct cb_data {
  	git_vector *list;
  	regex_t *preg;
  };
  
  static int remote_list_cb(const git_config_entry *entry, void *data_)
  {
  	struct cb_data *data = (struct cb_data *)data_;
  	size_t nmatch = 2;
  	regmatch_t pmatch[2];
  	const char *name = entry->name;
  
  	if (!regexec(data->preg, name, nmatch, pmatch, 0)) {
  		char *remote_name = git__strndup(&name[pmatch[1].rm_so], pmatch[1].rm_eo - pmatch[1].rm_so);
  		GITERR_CHECK_ALLOC(remote_name);
  
  		if (git_vector_insert(data->list, remote_name) < 0)
  			return -1;
  	}
  
  	return 0;
  }
  
  int git_remote_list(git_strarray *remotes_list, git_repository *repo)
  {
  	git_config *cfg;
  	git_vector list;
  	regex_t preg;
  	struct cb_data data;
  	int error;
  
  	if (git_repository_config__weakptr(&cfg, repo) < 0)
  		return -1;
  
  	if (git_vector_init(&list, 4, NULL) < 0)
  		return -1;
  
  	if (regcomp(&preg, "^remote\\.(.*)\\.url$", REG_EXTENDED) < 0) {
  		giterr_set(GITERR_OS, "Remote catch regex failed to compile");
  		return -1;
  	}
  
  	data.list = &list;
  	data.preg = &preg;
  	error = git_config_foreach(cfg, remote_list_cb, &data);
  	regfree(&preg);
  	if (error < 0) {
  		size_t i;
  		char *elem;
  		git_vector_foreach(&list, i, elem) {
  			git__free(elem);
  		}
  
  		git_vector_free(&list);
  
  		/* cb error is converted to GIT_EUSER by git_config_foreach */
  		if (error == GIT_EUSER)
  			error = -1;
  
  		return error;
  	}
  
  	remotes_list->strings = (char **)list.contents;
  	remotes_list->count = list.length;
  
  	return 0;
  }
  
  void git_remote_check_cert(git_remote *remote, int check)
  {
  	assert(remote);
  
  	remote->check_cert = check;
  }
  
  int git_remote_set_callbacks(git_remote *remote, 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)
  		remote->transport->set_callbacks(remote->transport,
  			remote->callbacks.progress,
  			NULL,
  			remote->callbacks.payload);
  
  	return 0;
  }
  
  void git_remote_set_cred_acquire_cb(
  	git_remote *remote,
  	git_cred_acquire_cb cred_acquire_cb,
  	void *payload)
  {
  	assert(remote);
  
  	remote->cred_acquire_cb = cred_acquire_cb;
  	remote->cred_acquire_payload = payload;
  }
  
  int git_remote_set_transport(git_remote *remote, git_transport *transport)
  {
  	assert(remote && transport);
  
  	GITERR_CHECK_VERSION(transport, GIT_TRANSPORT_VERSION, "git_transport");
  
  	if (remote->transport) {
  		giterr_set(GITERR_NET, "A transport is already bound to this remote");
  		return -1;
  	}
  
  	remote->transport = transport;
  	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(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 (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),
  		git_buf_cstr(&new_section_name));
  
  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)
  {
  	git_config *config;
  	struct update_data data;
  
  	if (git_repository_config__weakptr(&config, repo) < 0)
  		return -1;
  
  	data.config = config;
  	data.old_remote_name = old_name;
  	data.new_remote_name = new_name;
  
  	return git_config_foreach_match(
  		config,
  		"branch\\..+\\.remote",
  		update_config_entries_cb, &data);
  }
  
  static int rename_one_remote_reference(
  	git_reference *reference,
  	const char *old_remote_name,
  	const char *new_remote_name)
  {
  	int error = -1;
  	git_buf new_name = GIT_BUF_INIT;
  
  	if (git_buf_printf(
  		&new_name,
  		GIT_REFS_REMOTES_DIR "%s%s",
  		new_remote_name,
  		reference->name + strlen(GIT_REFS_REMOTES_DIR) + strlen(old_remote_name)) < 0)
  			return -1;
  
  	error = git_reference_rename(NULL, reference, git_buf_cstr(&new_name), 0);
  	git_reference_free(reference);
  
  	git_buf_free(&new_name);
  	return error;
  }
  
  static int rename_remote_references(
  	git_repository *repo,
  	const char *old_name,
  	const char *new_name)
  {
  	int error = -1;
  	git_reference *ref;
  	git_reference_iterator *iter;
  
  	if (git_reference_iterator_new(&iter, repo) < 0)
  		return -1;
  
  	while ((error = git_reference_next(&ref, iter)) == 0) {
  		if (git__prefixcmp(ref->name, GIT_REFS_REMOTES_DIR)) {
  			git_reference_free(ref);
  			continue;
  		}
  
  		if ((error = rename_one_remote_reference(ref, old_name, new_name)) < 0) {
  			git_reference_iterator_free(iter);
  			return error;
  		}
  	}
  
  	git_reference_iterator_free(iter);
  
  	if (error == GIT_ITEROVER)
  		return 0;
  
  	return error;
  }
  
  static int rename_fetch_refspecs(
  	git_remote *remote,
  	const char *new_name,
  	int (*callback)(const char *problematic_refspec, void *payload),
  	void *payload)
  {
  	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 = -1;
  
  	if (git_buf_printf(&base, "+refs/heads/*:refs/remotes/%s/*", remote->name) < 0)
  		goto cleanup;
  
  	git_vector_foreach(&remote->refspecs, i, spec) {
  		if (spec->push)
  			continue;
  
  		/* Every refspec is a problem refspec for an in-memory remote */
  		if (!remote->name) {
  			if (callback(spec->string, payload) < 0) {
  				error = GIT_EUSER;
  				goto cleanup;
  			}
  
  			continue;
  		}
  
  		/* Does the dst part of the refspec follow the extected standard format? */
  		if (strcmp(git_buf_cstr(&base), spec->string)) {
  			if (callback(spec->string, payload) < 0) {
  				error = GIT_EUSER;
  				goto cleanup;
  			}
  
  			continue;
  		}
  
  		/* If we do want to move it to the new section */
  		if (git_buf_printf(&val, "+refs/heads/*:refs/remotes/%s/*", new_name) < 0)
  			goto cleanup;
  
  		if (git_buf_printf(&var, "remote.%s.fetch", new_name) < 0)
  			goto cleanup;
  
  		if (git_repository_config__weakptr(&config, remote->repo) < 0)
  			goto cleanup;
  
  		if (git_config_set_string(config, git_buf_cstr(&var), git_buf_cstr(&val)) < 0)
  			goto cleanup;
  	}
  
  	error = 0;
  
  cleanup:
  	git_buf_free(&base);
  	git_buf_free(&var);
  	git_buf_free(&val);
  	return error;
  }
  
  int git_remote_rename(
  	git_remote *remote,
  	const char *new_name,
  	git_remote_rename_problem_cb callback,
  	void *payload)
  {
  	int error;
  
  	assert(remote && new_name);
  
  	if (!remote->name) {
  		giterr_set(GITERR_INVALID, "Can't rename an in-memory remote.");
  		return GIT_EINVALIDSPEC;
  	}
  
  	if ((error = ensure_remote_name_is_valid(new_name)) < 0)
  		return error;
  
  	if (remote->repo) {
  		if ((error = ensure_remote_doesnot_exist(remote->repo, new_name)) < 0)
  			return error;
  
  		if (!remote->name) {
  			if ((error = rename_fetch_refspecs(
  				remote,
  				new_name,
  				callback,
  				payload)) < 0)
  				return error;
  
  			remote->name = git__strdup(new_name);
  
  			if (!remote->name) return 0;
  			return git_remote_save(remote);
  		}
  
  		if ((error = rename_remote_config_section(
  			remote->repo,
  			remote->name,
  			new_name)) < 0)
  				return error;
  
  		if ((error = update_branch_remote_config_entry(
  			remote->repo,
  			remote->name,
  			new_name)) < 0)
  				return error;
  
  		if ((error = rename_remote_references(
  			remote->repo,
  			remote->name,
  			new_name)) < 0)
  				return error;
  
  		if ((error = rename_fetch_refspecs(
  			remote,
  			new_name,
  			callback,
  			payload)) < 0)
  			return error;
  	}
  
  	git__free(remote->name);
  	remote->name = git__strdup(new_name);
  
  	return 0;
  }
  
  int git_remote_update_fetchhead(git_remote *remote)
  {
  	return remote->update_fetchhead;
  }
  
  void git_remote_set_update_fetchhead(git_remote *remote, int value)
  {
  	remote->update_fetchhead = value;
  }
  
  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->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->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 copy_refspecs(git_strarray *array, git_remote *remote, 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_foreach(&refspecs, i, dup)
  		git__free(dup);
  	git_vector_free(&refspecs);
  
  	return -1;
  }
  
  int git_remote_get_fetch_refspecs(git_strarray *array, git_remote *remote)
  {
  	return copy_refspecs(array, remote, false);
  }
  
  int git_remote_get_push_refspecs(git_strarray *array, git_remote *remote)
  {
  	return copy_refspecs(array, remote, true);
  }
  
  size_t git_remote_refspec_count(git_remote *remote)
  {
  	return remote->refspecs.length;
  }
  
  const git_refspec *git_remote_get_refspec(git_remote *remote, size_t n)
  {
  	return git_vector_get(&remote->refspecs, n);
  }
  
  int git_remote_remove_refspec(git_remote *remote, size_t n)
  {
  	git_refspec *spec;
  
  	assert(remote);
  
  	spec = git_vector_get(&remote->refspecs, n);
  	if (spec) {
  		git_refspec__free(spec);
  		git__free(spec);
  	}
  
  	return git_vector_remove(&remote->refspecs, n);
  }
  

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