C++ remote_get函数代码示例

int cmd_fetch(int argc, const char **argv, const char *prefix)
{
	int i;
	struct string_list list = { NULL, 0, 0, 0 };
	struct remote *remote;
	int result = 0;

	/* Record the command line for the reflog */
	strbuf_addstr(&default_rla, "fetch");
	for (i = 1; i < argc; i++)
		strbuf_addf(&default_rla, " %s", argv[i]);

	argc = parse_options(argc, argv, prefix,
			     builtin_fetch_options, builtin_fetch_usage, 0);

	if (all) {
		if (argc == 1)
			die("fetch --all does not take a repository argument");
		else if (argc > 1)
			die("fetch --all does not make sense with refspecs");
		(void) for_each_remote(get_one_remote_for_fetch, &list);
		result = fetch_multiple(&list);
	} else if (argc == 0) {
		/* No arguments -- use default remote */
		remote = remote_get(NULL);
		result = fetch_one(remote, argc, argv);
	} else if (multiple) {
		/* All arguments are assumed to be remotes or groups */
		for (i = 0; i < argc; i++)
			if (!add_remote_or_group(argv[i], &list))
				die("No such remote or remote group: %s", argv[i]);
		result = fetch_multiple(&list);
	} else {
		/* Single remote or group */
		(void) add_remote_or_group(argv[0], &list);
		if (list.nr > 1) {
			/* More than one remote */
			if (argc > 1)
				die("Fetching a group and specifying refspecs does not make sense");
			result = fetch_multiple(&list);
		} else {
			/* Zero or one remotes */
			remote = remote_get(argv[0]);
			result = fetch_one(remote, argc-1, argv+1);
		}
	}

	/* All names were strdup()ed or strndup()ed */
	list.strdup_strings = 1;
	string_list_clear(&list, 0);

	return result;
}

static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
{
	char *other;
	size_t len;
	struct remote *remote;
	struct transport *transport;
	const struct ref *extra;

	e->name[-1] = '\0';
	other = xstrdup(make_absolute_path(e->base));
	e->name[-1] = '/';
	len = strlen(other);

	while (other[len-1] == '/')
		other[--len] = '\0';
	if (len < 8 || memcmp(other + len - 8, "/objects", 8))
		return 0;
	/* Is this a git repository with refs? */
	memcpy(other + len - 8, "/refs", 6);
	if (!is_directory(other))
		return 0;
	other[len - 8] = '\0';
	remote = remote_get(other);
	transport = transport_get(remote, other);
	for (extra = transport_get_remote_refs(transport);
	     extra;
	     extra = extra->next) {
		add_extra_ref(".have", extra->old_sha1, 0);
	}
	transport_disconnect(transport);
	free(other);
	return 0;
}

static const struct ref *clone_local(const char *src_repo,
				     const char *dest_repo)
{
	const struct ref *ret;
	struct strbuf src = STRBUF_INIT;
	struct strbuf dest = STRBUF_INIT;
	struct remote *remote;
	struct transport *transport;

	if (option_shared)
		add_to_alternates_file(src_repo);
	else {
		strbuf_addf(&src, "%s/objects", src_repo);
		strbuf_addf(&dest, "%s/objects", dest_repo);
		copy_or_link_directory(&src, &dest);
		strbuf_release(&src);
		strbuf_release(&dest);
	}

	remote = remote_get(src_repo);
	transport = transport_get(remote, src_repo);
	ret = transport_get_remote_refs(transport);
	transport_disconnect(transport);
	return ret;
}

static int refs_from_alternate_cb(struct alternate_object_database *e,
				  void *data)
{
	char *other;
	size_t len;
	struct remote *remote;
	struct transport *transport;
	const struct ref *extra;
	struct alternate_refs_data *cb = data;

	e->name[-1] = '\0';
	other = xstrdup(real_path(e->base));
	e->name[-1] = '/';
	len = strlen(other);

	while (other[len-1] == '/')
		other[--len] = '\0';
	if (len < 8 || memcmp(other + len - 8, "/objects", 8))
		return 0;
	/* Is this a git repository with refs? */
	memcpy(other + len - 8, "/refs", 6);
	if (!is_directory(other))
		return 0;
	other[len - 8] = '\0';
	remote = remote_get(other);
	transport = transport_get(remote, other);
	for (extra = transport_get_remote_refs(transport);
	     extra;
	     extra = extra->next)
		cb->fn(extra, cb->data);
	transport_disconnect(transport);
	free(other);
	return 0;
}

val* transaction_get(transaction* t, key* k) {
    val* v;
    flat_key_val* kv;
    
    // If read set is empty, mark current ST
    if ((t->st == -1) && (hashtable_count(t->rs) == 0))
		t->st = cproxy_current_st();
	
	// Lookup write set
	kv = hashtable_search(t->ws, k);
	if (kv != NULL) {
		v = val_new(&kv->data[kv->ksize], kv->vsize);
		// if (v->size > 0)
			add_to_set(t->rs, k, v);
		return v;
	}

    // Lookup read set
	kv = hashtable_search(t->rs, k);
	if (kv != NULL) {
		v = val_new(&kv->data[kv->ksize], kv->vsize);
		return v;
	}
	
    // Lookup storage
   	if ((v = sm_get(k, t->st)) != NULL) {
       	add_to_set(t->rs, k, v);
		return v;
	}
	
	// Issue a remote get and return NULL
	remote_get(k, t->st, remote_get_cb, t);
	return NULL;
}

static void setup_reference(const char *repo)
{
	const char *ref_git;
	char *ref_git_copy;

	struct remote *remote;
	struct transport *transport;
	const struct ref *extra;

	ref_git = make_absolute_path(option_reference);

	if (is_directory(mkpath("%s/.git/objects", ref_git)))
		ref_git = mkpath("%s/.git", ref_git);
	else if (!is_directory(mkpath("%s/objects", ref_git)))
		die("reference repository '%s' is not a local directory.",
		    option_reference);

	ref_git_copy = xstrdup(ref_git);

	add_to_alternates_file(ref_git_copy);

	remote = remote_get(ref_git_copy);
	transport = transport_get(remote, ref_git_copy);
	for (extra = transport_get_remote_refs(transport); extra;
	     extra = extra->next)
		add_extra_ref(extra->name, extra->old_sha1, 0);

	transport_disconnect(transport);

	free(ref_git_copy);
}

static void set_refspecs(const char **refs, int nr, const char *repo)
{
	struct remote *remote = NULL;
	struct ref *local_refs = NULL;
	int i;

	for (i = 0; i < nr; i++) {
		const char *ref = refs[i];
		if (!strcmp("tag", ref)) {
			struct strbuf tagref = STRBUF_INIT;
			if (nr <= ++i)
				die(_("tag shorthand without <tag>"));
			ref = refs[i];
			if (deleterefs)
				strbuf_addf(&tagref, ":refs/tags/%s", ref);
			else
				strbuf_addf(&tagref, "refs/tags/%s", ref);
			ref = strbuf_detach(&tagref, NULL);
		} else if (deleterefs) {
			struct strbuf delref = STRBUF_INIT;
			if (strchr(ref, ':'))
				die(_("--delete only accepts plain target ref names"));
			strbuf_addf(&delref, ":%s", ref);
			ref = strbuf_detach(&delref, NULL);
		} else if (!strchr(ref, ':')) {
			if (!remote) {
				/* lazily grab remote and local_refs */
				remote = remote_get(repo);
				local_refs = get_local_heads();
			}
			ref = map_refspec(ref, remote, local_refs);
		}
		add_refspec(ref);
	}
}

struct branch *branch_get(const char *name)
{
	struct branch *ret;

	read_config();
	if (!name || !*name || !strcmp(name, "HEAD"))
		ret = current_branch;
	else
		ret = make_branch(name, 0);
	if (ret && ret->remote_name) {
		ret->remote = remote_get(ret->remote_name);
		if (ret->merge_nr) {
			int i;
			ret->merge = xcalloc(sizeof(*ret->merge),
					     ret->merge_nr);
			for (i = 0; i < ret->merge_nr; i++) {
				ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
				ret->merge[i]->src = xstrdup(ret->merge_name[i]);
				remote_find_tracking(ret->remote,
						     ret->merge[i]);
			}
		}
	}
	return ret;
}

static const struct ref *clone_local(const char *src_repo,
				     const char *dest_repo)
{
	const struct ref *ret;
	struct remote *remote;
	struct transport *transport;

	if (option_shared) {
		struct strbuf alt = STRBUF_INIT;
		strbuf_addf(&alt, "%s/objects", src_repo);
		add_to_alternates_file(alt.buf);
		strbuf_release(&alt);
	} else {
		struct strbuf src = STRBUF_INIT;
		struct strbuf dest = STRBUF_INIT;
		strbuf_addf(&src, "%s/objects", src_repo);
		strbuf_addf(&dest, "%s/objects", dest_repo);
		copy_or_link_directory(&src, &dest, src_repo, src.len);
		strbuf_release(&src);
		strbuf_release(&dest);
	}

	remote = remote_get(src_repo);
	transport = transport_get(remote, src_repo);
	ret = transport_get_remote_refs(transport);
	transport_disconnect(transport);
	if (0 <= option_verbosity)
		printf(_("done.\n"));
	return ret;
}

static int add_one_reference(struct string_list_item *item, void *cb_data)
{
	char *ref_git;
	struct strbuf alternate = STRBUF_INIT;
	struct remote *remote;
	struct transport *transport;
	const struct ref *extra;

	/* Beware: real_path() and mkpath() return static buffer */
	ref_git = xstrdup(real_path(item->string));
	if (is_directory(mkpath("%s/.git/objects", ref_git))) {
		char *ref_git_git = xstrdup(mkpath("%s/.git", ref_git));
		free(ref_git);
		ref_git = ref_git_git;
	} else if (!is_directory(mkpath("%s/objects", ref_git)))
		die(_("reference repository '%s' is not a local directory."),
		    item->string);

	strbuf_addf(&alternate, "%s/objects", ref_git);
	add_to_alternates_file(alternate.buf);
	strbuf_release(&alternate);

	remote = remote_get(ref_git);
	transport = transport_get(remote, ref_git);
	for (extra = transport_get_remote_refs(transport); extra;
	     extra = extra->next)
		add_extra_ref(extra->name, extra->old_sha1, 0);

	transport_disconnect(transport);
	free(ref_git);
	return 0;
}

int main(int argc, char **argv)
{
	struct strbuf buf = STRBUF_INIT, url_sb = STRBUF_INIT,
			private_ref_sb = STRBUF_INIT, marksfilename_sb = STRBUF_INIT,
			notes_ref_sb = STRBUF_INIT;
	static struct remote *remote;
	const char *url_in;

	git_extract_argv0_path(argv[0]);
	setup_git_directory();
	if (argc < 2 || argc > 3) {
		usage("git-remote-svn <remote-name> [<url>]");
		return 1;
	}

	remote = remote_get(argv[1]);
	url_in = (argc == 3) ? argv[2] : remote->url[0];

	if (starts_with(url_in, "file://")) {
		dump_from_file = 1;
		url = url_decode(url_in + sizeof("file://")-1);
	} else {
		dump_from_file = 0;
		end_url_with_slash(&url_sb, url_in);
		url = url_sb.buf;
	}

	strbuf_addf(&private_ref_sb, "refs/svn/%s/master", remote->name);
	private_ref = private_ref_sb.buf;

	strbuf_addf(&notes_ref_sb, "refs/notes/%s/revs", remote->name);
	notes_ref = notes_ref_sb.buf;

	strbuf_addf(&marksfilename_sb, "%s/info/fast-import/remote-svn/%s.marks",
		get_git_dir(), remote->name);
	marksfilename = marksfilename_sb.buf;

	while (1) {
		if (strbuf_getline(&buf, stdin, '\n') == EOF) {
			if (ferror(stdin))
				die("Error reading command stream");
			else
				die("Unexpected end of command stream");
		}
		if (do_command(&buf))
			break;
		strbuf_reset(&buf);
	}

	strbuf_release(&buf);
	strbuf_release(&url_sb);
	strbuf_release(&private_ref_sb);
	strbuf_release(&notes_ref_sb);
	strbuf_release(&marksfilename_sb);
	return 0;
}

static int run_remote_archiver(int argc, const char **argv,
			       const char *remote, const char *exec,
			       const char *name_hint)
{
	char buf[LARGE_PACKET_MAX];
	int fd[2], i, len, rv;
	struct transport *transport;
	struct remote *_remote;

	_remote = remote_get(remote);
	if (!_remote->url[0])
		die(_("git archive: Remote with no URL"));
	transport = transport_get(_remote, _remote->url[0]);
	transport_connect(transport, "git-upload-archive", exec, fd);

	/*
	 * Inject a fake --format field at the beginning of the
	 * arguments, with the format inferred from our output
	 * filename. This way explicit --format options can override
	 * it.
	 */
	if (name_hint) {
		const char *format = archive_format_from_filename(name_hint);
		if (format)
			packet_write(fd[1], "argument --format=%s\n", format);
	}
	for (i = 1; i < argc; i++)
		packet_write(fd[1], "argument %s\n", argv[i]);
	packet_flush(fd[1]);

	len = packet_read_line(fd[0], buf, sizeof(buf));
	if (!len)
		die(_("git archive: expected ACK/NAK, got EOF"));
	if (buf[len-1] == '\n')
		buf[--len] = 0;
	if (strcmp(buf, "ACK")) {
		if (len > 5 && !prefixcmp(buf, "NACK "))
			die(_("git archive: NACK %s"), buf + 5);
		die(_("git archive: protocol error"));
	}

	len = packet_read_line(fd[0], buf, sizeof(buf));
	if (len)
		die(_("git archive: expected a flush"));

	/* Now, start reading from fd[0] and spit it out to stdout */
	rv = recv_sideband("archive", fd[0], 1);
	rv |= transport_disconnect(transport);

	return !!rv;
}

static int do_push(const char *repo, int flags)
{
	int i, errs;
	struct remote *remote = remote_get(repo);

	if (!remote)
		die("bad repository '%s'", repo);

	if (remote->mirror)
		flags |= (TRANSPORT_PUSH_MIRROR|TRANSPORT_PUSH_FORCE);

	if ((flags & (TRANSPORT_PUSH_ALL|TRANSPORT_PUSH_MIRROR)) && refspec)
		return -1;

	if ((flags & (TRANSPORT_PUSH_ALL|TRANSPORT_PUSH_MIRROR)) ==
				(TRANSPORT_PUSH_ALL|TRANSPORT_PUSH_MIRROR)) {
		return error("--all and --mirror are incompatible");
	}

	if (!refspec
		&& !(flags & TRANSPORT_PUSH_ALL)
		&& remote->push_refspec_nr) {
		refspec = remote->push_refspec;
		refspec_nr = remote->push_refspec_nr;
	}
	errs = 0;
	for (i = 0; i < remote->url_nr; i++) {
		struct transport *transport =
			transport_get(remote, remote->url[i]);
		int err;
		if (receivepack)
			transport_set_option(transport,
					     TRANS_OPT_RECEIVEPACK, receivepack);
		if (thin)
			transport_set_option(transport, TRANS_OPT_THIN, "yes");

		if (verbose)
			fprintf(stderr, "Pushing to %s\n", remote->url[i]);
		err = transport_push(transport, refspec_nr, refspec, flags);
		err |= transport_disconnect(transport);

		if (!err)
			continue;

		error("failed to push some refs to '%s'", remote->url[i]);
		errs++;
	}
	return !!errs;
}

static int add_remote_or_group(const char *name, struct string_list *list)
{
	int prev_nr = list->nr;
	struct remote_group_data g = { name, list };

	git_config(get_remote_group, &g);
	if (list->nr == prev_nr) {
		struct remote *remote;
		if (!remote_is_configured(name))
			return 0;
		remote = remote_get(name);
		string_list_append(remote->name, list);
	}
	return 1;
}

static void fetch_refs(const char *remote_name, struct ref *ref)
{
	struct remote *remote;
	struct transport *transport;
	int original_fetch_if_missing = fetch_if_missing;

	fetch_if_missing = 0;
	remote = remote_get(remote_name);
	if (!remote->url[0])
		die(_("Remote with no URL"));
	transport = transport_get(remote, remote->url[0]);

	transport_set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
	transport_set_option(transport, TRANS_OPT_NO_DEPENDENTS, "1");
	transport_fetch_refs(transport, ref);
	fetch_if_missing = original_fetch_if_missing;
}