transport: add client support for object-info

Sometimes, it is beneficial to retrieve information about an object
without downloading it entirely. The server-side logic for this
functionality was implemented in commit "a2ba162cda (object-info:
support for retrieving object info, 2021-04-20)." And the wire
format is documented at
https://git-scm.com/docs/protocol-v2#_object_info.

This commit introduces client functions to interact with the server.

Currently, the client supports requesting a list of object IDs with
the 'size' feature from a v2 server. If the server does not advertise
this feature (i.e., transfer.advertiseobjectinfo is set to false),
the client will return an error and exit.

Notice that the entire request is written into req_buf before being
sent to the remote. This approach follows the pattern used in the
`send_fetch_request()` logic within fetch-pack.c.
Streaming the request is not addressed in this patch.

Helped-by: Jonathan Tan <jonathantanmy@google.com>
Helped-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Eric Ju <eric.peijian@gmail.com>
Signed-off-by: Pablo Sabater <pabloosabaterr@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1159,6 +1159,7 @@ LIB_OBJS += ewah/ewah_rlw.o
 LIB_OBJS += exec-cmd.o
 LIB_OBJS += fetch-negotiator.o
 LIB_OBJS += fetch-pack.o
+LIB_OBJS += fetch-object-info.o
 LIB_OBJS += fmt-merge-msg.o
 LIB_OBJS += fsck.o
 LIB_OBJS += fsmonitor.o

fetch-object-info.c

@@ -0,0 +1,90 @@
+#include "git-compat-util.h"
+#include "gettext.h"
+#include "hex.h"
+#include "pkt-line.h"
+#include "connect.h"
+#include "oid-array.h"
+#include "odb.h"
+#include "fetch-object-info.h"
+#include "string-list.h"
+
+/* Sends git-cat-file object-info command and its arguments into the request buffer. */
+static void send_object_info_request(const int fd_out, struct object_info_args *args)
+{
+	struct strbuf req_buf = STRBUF_INIT;
+
+	write_command_and_capabilities(&req_buf, "object-info", args->server_options);
+
+	if (unsorted_string_list_has_string(args->object_info_options, "size"))
+		packet_buf_write(&req_buf, "size");
+
+	if (args->oids)
+		for (size_t i = 0; i < args->oids->nr; i++)
+			packet_buf_write(&req_buf, "oid %s", oid_to_hex(&args->oids->oid[i]));
+
+	packet_buf_flush(&req_buf);
+	if (write_in_full(fd_out, req_buf.buf, req_buf.len) < 0)
+		die_errno(_("unable to write request to remote"));
+
+	strbuf_release(&req_buf);
+}
+
+int fetch_object_info(const enum protocol_version version, struct object_info_args *args,
+		      struct packet_reader *reader, struct object_info *object_info_data,
+		      const int stateless_rpc, const int fd_out)
+{
+	int size_index = -1;
+
+	switch (version) {
+	case protocol_v2:
+		if (!server_supports_v2("object-info"))
+			die(_("object-info capability is not enabled on the server"));
+		send_object_info_request(fd_out, args);
+		break;
+	case protocol_v1:
+	case protocol_v0:
+		die(_("unsupported protocol version. expected v2"));
+	case protocol_unknown_version:
+		BUG("unknown protocol version");
+	}
+
+	for (size_t i = 0; i < args->object_info_options->nr; i++) {
+		if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
+			check_stateless_delimiter(stateless_rpc, reader,
+						  "stateless delimiter expected");
+			return -1;
+		}
+
+		if (!string_list_has_string(args->object_info_options, reader->line))
+			return -1;
+
+		if (!strcmp(reader->line, "size")) {
+			size_index = i;
+			for (size_t j = 0; j < args->oids->nr; j++)
+				object_info_data[j].sizep = xcalloc(1, sizeof(*object_info_data[j].sizep));
+		}
+	}
+
+	for (size_t i = 0; packet_reader_read(reader) == PACKET_READ_NORMAL && i < args->oids->nr; i++) {
+		struct string_list object_info_values = STRING_LIST_INIT_DUP;
+
+		string_list_split(&object_info_values, reader->line, " ", -1);
+		if (0 <= size_index) {
+			if (!strcmp(object_info_values.items[1 + size_index].string, "")) {
+				FREE_AND_NULL(object_info_data[i].sizep);
+				string_list_clear(&object_info_values, 0);
+				continue;
+			}
+			if (strtoul_szt(object_info_values.items[1 + size_index].string,
+				       10, object_info_data[i].sizep))
+				die("object-info: ref %s has invalid size %s",
+				    object_info_values.items[0].string,
+				    object_info_values.items[1 + size_index].string);
+		}
+
+		string_list_clear(&object_info_values, 0);
+	}
+	check_stateless_delimiter(stateless_rpc, reader, "stateless delimiter expected");
+
+	return 0;
+}

fetch-object-info.h

@@ -0,0 +1,22 @@
+#ifndef FETCH_OBJECT_INFO_H
+#define FETCH_OBJECT_INFO_H
+
+#include "pkt-line.h"
+#include "protocol.h"
+#include "odb.h"
+
+struct object_info_args {
+	struct string_list *object_info_options;
+	const struct string_list *server_options;
+	struct oid_array *oids;
+};
+
+/*
+ * Sends git-cat-file object-info command into the request buf and read the
+ * results from packets.
+ */
+int fetch_object_info(enum protocol_version version, struct object_info_args *args,
+		      struct packet_reader *reader, struct object_info *object_info_data,
+		      int stateless_rpc, int fd_out);
+
+#endif /* FETCH_OBJECT_INFO_H */

fetch-pack.c

@@ -1742,6 +1742,9 @@ static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
 	if (args->depth > 0 || args->deepen_since || args->deepen_not)
 		args->deepen = 1;
 
+	if (args->object_info)
+		state = FETCH_SEND_REQUEST;
+
 	while (state != FETCH_DONE) {
 		switch (state) {
 		case FETCH_CHECK_LOCAL:

fetch-pack.h

@@ -16,6 +16,7 @@ struct fetch_pack_args {
 	const struct string_list *deepen_not;
 	struct list_objects_filter_options filter_options;
 	const struct string_list *server_options;
+	struct object_info *object_info_data;
 
 	/*
 	 * If not NULL, during packfile negotiation, fetch-pack will send "have"
@@ -43,6 +44,7 @@ struct fetch_pack_args {
 	unsigned reject_shallow_remote:1;
 	unsigned deepen:1;
 	unsigned refetch:1;
+	unsigned object_info:1;
 
 	/*
 	 * Indicate that the remote of this request is a promisor remote. The

meson.build

@@ -347,6 +347,7 @@ libgit_sources = [
   'exec-cmd.c',
   'fetch-negotiator.c',
   'fetch-pack.c',
+  'fetch-object-info.c',
   'fmt-merge-msg.c',
   'fsck.c',
   'fsmonitor.c',

transport-helper.c

@@ -727,8 +727,8 @@ static int fetch_refs(struct transport *transport,
 
 	/*
 	 * If we reach here, then the server, the client, and/or the transport
-	 * helper does not support protocol v2. --negotiate-only requires
-	 * protocol v2.
+	 * helper does not support protocol v2. --negotiate-only and cat-file
+	 * remote-object-info require protocol v2.
 	 */
 	if (data->transport_options.acked_commits) {
 		warning(_("--negotiate-only requires protocol v2"));
@@ -744,6 +744,13 @@ static int fetch_refs(struct transport *transport,
 		free_refs(dummy);
 	}
 
+	/* fail the command explicitly to avoid further commands input. */
+	if (transport->smart_options->object_info)
+		die(_("remote-object-info requires protocol v2"));
+
+	if (!data->get_refs_list_called)
+		get_refs_list_using_list(transport, 0);
+
 	count = 0;
 	for (i = 0; i < nr_heads; i++)
 		if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))

transport.c

@@ -9,6 +9,7 @@
 #include "hook.h"
 #include "pkt-line.h"
 #include "fetch-pack.h"
+#include "fetch-object-info.h"
 #include "remote.h"
 #include "connect.h"
 #include "send-pack.h"
@@ -467,8 +468,33 @@ static int fetch_refs_via_pack(struct transport *transport,
 	args.negotiation_restrict_tips = data->options.negotiation_restrict_tips;
 	args.negotiation_include_tips = data->options.negotiation_include_tips;
 	args.reject_shallow_remote = transport->smart_options->reject_shallow;
+	args.object_info = transport->smart_options->object_info;
 
-	if (!data->finished_handshake) {
+	if (transport->smart_options->object_info
+	    && transport->smart_options->object_info_oids->nr > 0) {
+		struct packet_reader reader;
+		struct object_info_args obj_info_args = { 0 };
+
+		obj_info_args.server_options = transport->server_options;
+		obj_info_args.oids = transport->smart_options->object_info_oids;
+		obj_info_args.object_info_options = transport->smart_options->object_info_options;
+		string_list_sort(obj_info_args.object_info_options);
+
+		connect_setup(transport, 0);
+		packet_reader_init(&reader, data->fd[0], NULL, 0,
+				PACKET_READ_CHOMP_NEWLINE |
+				PACKET_READ_GENTLE_ON_EOF |
+				PACKET_READ_DIE_ON_ERR_PACKET);
+
+		data->version = discover_version(&reader);
+		transport->hash_algo = reader.hash_algo;
+
+		ret = fetch_object_info(data->version, &obj_info_args, &reader,
+					data->options.object_info_data, transport->stateless_rpc,
+					data->fd[1]);
+		goto cleanup;
+
+	} else if (!data->finished_handshake) {
 		int i;
 		int must_list_refs = 0;
 		for (i = 0; i < nr_heads; i++) {

transport.h

@@ -6,6 +6,7 @@
 #include "list-objects-filter-options.h"
 #include "string-list.h"
 #include "connect.h"
+#include "odb.h"
 
 struct git_transport_options {
 	unsigned thin : 1;
@@ -31,6 +32,12 @@ struct git_transport_options {
 	 */
 	unsigned connectivity_checked:1;
 
+	/*
+	 * Transport will attempt to retrieve only object-info.
+	 * If object-info is not supported, the operation will error and exit.
+	 */
+	unsigned object_info : 1;
+
 	int depth;
 	const char *deepen_since;
 	const struct string_list *deepen_not;
@@ -55,6 +62,10 @@ struct git_transport_options {
 	 * common commits to this oidset instead of fetching any packfiles.
 	 */
 	struct oidset *acked_commits;
+
+	struct oid_array *object_info_oids;
+	struct object_info *object_info_data;
+	struct string_list *object_info_options;
 };
 
 enum transport_family {