static void add_wants(int no_dependents, const struct ref *wants, struct strbuf *req_buf)
{
int use_ref_in_want = server_supports_feature("fetch", "ref-in-want", 0);
for ( ; wants ; wants = wants->next) {
const struct object_id *remote = &wants->old_oid;
struct object *o;
/*
* If that object is complete (i.e. it is an ancestor of a
* local ref), we tell them we have it but do not have to
* tell them about its ancestors, which they already know
* about.
*
* We use lookup_object here because we are only
* interested in the case we *know* the object is
* reachable and we have already scanned it.
*
* Do this only if args->no_dependents is false (if it is true,
* we cannot trust the object flags).
*/
if (!no_dependents &&
((o = lookup_object(the_repository, remote->hash)) != NULL) &&
(o->flags & COMPLETE)) {
continue;
}
if (!use_ref_in_want || wants->exact_oid)
packet_buf_write(req_buf, "want %s\n", oid_to_hex(remote));
else
packet_buf_write(req_buf, "want-ref %s\n", wants->name);
}
}
static int send_fetch_request(int fd_out, const struct fetch_pack_args *args,
const struct ref *wants, struct oidset *common,
int *haves_to_send, int *in_vain)
{
int ret = 0;
struct strbuf req_buf = STRBUF_INIT;
if (server_supports_v2("fetch", 1))
packet_buf_write(&req_buf, "command=fetch");
if (server_supports_v2("agent", 0))
packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
packet_buf_delim(&req_buf);
if (args->use_thin_pack)
packet_buf_write(&req_buf, "thin-pack");
if (args->no_progress)
packet_buf_write(&req_buf, "no-progress");
if (args->include_tag)
packet_buf_write(&req_buf, "include-tag");
if (prefer_ofs_delta)
packet_buf_write(&req_buf, "ofs-delta");
/* Add shallow-info and deepen request */
if (server_supports_feature("fetch", "shallow", 0))
add_shallow_requests(&req_buf, args);
else if (is_repository_shallow() || args->deepen)
die(_("Server does not support shallow requests"));
/* add wants */
add_wants(wants, &req_buf);
/* Add all of the common commits we've found in previous rounds */
add_common(&req_buf, common);
/* Add initial haves */
ret = add_haves(&req_buf, haves_to_send, in_vain);
/* Send request */
packet_buf_flush(&req_buf);
write_or_die(fd_out, req_buf.buf, req_buf.len);
strbuf_release(&req_buf);
return ret;
}
static int send_fetch_request(struct fetch_negotiator *negotiator, int fd_out,
const struct fetch_pack_args *args,
const struct ref *wants, struct oidset *common,
int *haves_to_send, int *in_vain)
{
int ret = 0;
struct strbuf req_buf = STRBUF_INIT;
if (server_supports_v2("fetch", 1))
packet_buf_write(&req_buf, "command=fetch");
if (server_supports_v2("agent", 0))
packet_buf_write(&req_buf, "agent=%s", git_user_agent_sanitized());
if (args->server_options && args->server_options->nr &&
server_supports_v2("server-option", 1)) {
int i;
for (i = 0; i < args->server_options->nr; i++)
packet_write_fmt(fd_out, "server-option=%s",
args->server_options->items[i].string);
}
packet_buf_delim(&req_buf);
if (args->use_thin_pack)
packet_buf_write(&req_buf, "thin-pack");
if (args->no_progress)
packet_buf_write(&req_buf, "no-progress");
if (args->include_tag)
packet_buf_write(&req_buf, "include-tag");
if (prefer_ofs_delta)
packet_buf_write(&req_buf, "ofs-delta");
/* Add shallow-info and deepen request */
if (server_supports_feature("fetch", "shallow", 0))
add_shallow_requests(&req_buf, args);
else if (is_repository_shallow(the_repository) || args->deepen)
die(_("Server does not support shallow requests"));
/* Add filter */
if (server_supports_feature("fetch", "filter", 0) &&
args->filter_options.choice) {
print_verbose(args, _("Server supports filter"));
packet_buf_write(&req_buf, "filter %s",
args->filter_options.filter_spec);
} else if (args->filter_options.choice) {
warning("filtering not recognized by server, ignoring");
}
/* add wants */
add_wants(args->no_dependents, wants, &req_buf);
if (args->no_dependents) {
packet_buf_write(&req_buf, "done");
ret = 1;
} else {
/* Add all of the common commits we've found in previous rounds */
add_common(&req_buf, common);
/* Add initial haves */
ret = add_haves(negotiator, &req_buf, haves_to_send, in_vain);
}
/* Send request */
packet_buf_flush(&req_buf);
write_or_die(fd_out, req_buf.buf, req_buf.len);
strbuf_release(&req_buf);
return ret;
}
static struct ref *do_fetch_pack_v2(struct fetch_pack_args *args,
int fd[2],
const struct ref *orig_ref,
struct ref **sought, int nr_sought,
char **pack_lockfile)
{
struct ref *ref = copy_ref_list(orig_ref);
enum fetch_state state = FETCH_CHECK_LOCAL;
struct oidset common = OIDSET_INIT;
struct packet_reader reader;
int in_vain = 0;
int haves_to_send = INITIAL_FLUSH;
struct fetch_negotiator negotiator;
fetch_negotiator_init(&negotiator, negotiation_algorithm);
packet_reader_init(&reader, fd[0], NULL, 0,
PACKET_READ_CHOMP_NEWLINE |
PACKET_READ_DIE_ON_ERR_PACKET);
if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 1) &&
server_supports_feature("fetch", "sideband-all", 0)) {
reader.use_sideband = 1;
reader.me = "fetch-pack";
}
while (state != FETCH_DONE) {
switch (state) {
case FETCH_CHECK_LOCAL:
sort_ref_list(&ref, ref_compare_name);
QSORT(sought, nr_sought, cmp_ref_by_name);
/* v2 supports these by default */
allow_unadvertised_object_request |= ALLOW_REACHABLE_SHA1;
use_sideband = 2;
if (args->depth > 0 || args->deepen_since || args->deepen_not)
args->deepen = 1;
/* Filter 'ref' by 'sought' and those that aren't local */
if (!args->no_dependents) {
mark_complete_and_common_ref(&negotiator, args, &ref);
filter_refs(args, &ref, sought, nr_sought);
if (everything_local(args, &ref))
state = FETCH_DONE;
else
state = FETCH_SEND_REQUEST;
mark_tips(&negotiator, args->negotiation_tips);
for_each_cached_alternate(&negotiator,
insert_one_alternate_object);
} else {
filter_refs(args, &ref, sought, nr_sought);
state = FETCH_SEND_REQUEST;
}
break;
case FETCH_SEND_REQUEST:
if (send_fetch_request(&negotiator, fd[1], args, ref,
&common,
&haves_to_send, &in_vain,
reader.use_sideband))
state = FETCH_GET_PACK;
else
state = FETCH_PROCESS_ACKS;
break;
case FETCH_PROCESS_ACKS:
/* Process ACKs/NAKs */
switch (process_acks(&negotiator, &reader, &common)) {
case 2:
state = FETCH_GET_PACK;
break;
case 1:
in_vain = 0;
/* fallthrough */
default:
state = FETCH_SEND_REQUEST;
break;
}
break;
case FETCH_GET_PACK:
/* Check for shallow-info section */
if (process_section_header(&reader, "shallow-info", 1))
receive_shallow_info(args, &reader);
if (process_section_header(&reader, "wanted-refs", 1))
receive_wanted_refs(&reader, sought, nr_sought);
/* get the pack */
process_section_header(&reader, "packfile", 0);
if (get_pack(args, fd, pack_lockfile))
die(_("git fetch-pack: fetch failed."));
state = FETCH_DONE;
break;
case FETCH_DONE:
continue;
}
}
negotiator.release(&negotiator);
oidset_clear(&common);
return ref;
}
