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send-pack: support push negotiation

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Teach Git the push.negotiate config variable.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan
2021-05-04 14:16:02 -07:00
committed by Junio C Hamano
parent 9c1e657a8f
commit 477673d6f3
3 changed files with 99 additions and 4 deletions
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61
send-pack.c
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@ -56,7 +56,9 @@ static void feed_object(const struct object_id *oid, FILE *fh, int negative)
/*
* Make a pack stream and spit it out into file descriptor fd
*/
static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
static int pack_objects(int fd, struct ref *refs, struct oid_array *advertised,
struct oid_array *negotiated,
struct send_pack_args *args)
{
/*
* The child becomes pack-objects --revs; we feed
@ -94,8 +96,10 @@ static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struc
* parameters by writing to the pipe.
*/
po_in = xfdopen(po.in, "w");
for (i = 0; i < extra->nr; i++)
feed_object(&extra->oid[i], po_in, 1);
for (i = 0; i < advertised->nr; i++)
feed_object(&advertised->oid[i], po_in, 1);
for (i = 0; i < negotiated->nr; i++)
feed_object(&negotiated->oid[i], po_in, 1);
while (refs) {
if (!is_null_oid(&refs->old_oid))
@ -409,11 +413,55 @@ static void reject_invalid_nonce(const char *nonce, int len)
}
}
static void get_commons_through_negotiation(const char *url,
const struct ref *remote_refs,
struct oid_array *commons)
{
struct child_process child = CHILD_PROCESS_INIT;
const struct ref *ref;
int len = the_hash_algo->hexsz + 1; /* hash + NL */
child.git_cmd = 1;
child.no_stdin = 1;
child.out = -1;
strvec_pushl(&child.args, "fetch", "--negotiate-only", NULL);
for (ref = remote_refs; ref; ref = ref->next)
strvec_pushf(&child.args, "--negotiation-tip=%s", oid_to_hex(&ref->new_oid));
strvec_push(&child.args, url);
if (start_command(&child))
die(_("send-pack: unable to fork off fetch subprocess"));
do {
char hex_hash[GIT_MAX_HEXSZ + 1];
int read_len = read_in_full(child.out, hex_hash, len);
struct object_id oid;
const char *end;
if (!read_len)
break;
if (read_len != len)
die("invalid length read %d", read_len);
if (parse_oid_hex(hex_hash, &oid, &end) || *end != '\n')
die("invalid hash");
oid_array_append(commons, &oid);
} while (1);
if (finish_command(&child)) {
/*
* The information that push negotiation provides is useful but
* not mandatory.
*/
warning(_("push negotiation failed; proceeding anyway with push"));
}
}
int send_pack(struct send_pack_args *args,
int fd[], struct child_process *conn,
struct ref *remote_refs,
struct oid_array *extra_have)
{
struct oid_array commons = OID_ARRAY_INIT;
int in = fd[0];
int out = fd[1];
struct strbuf req_buf = STRBUF_INIT;
@ -426,6 +474,7 @@ int send_pack(struct send_pack_args *args,
int quiet_supported = 0;
int agent_supported = 0;
int advertise_sid = 0;
int push_negotiate = 0;
int use_atomic = 0;
int atomic_supported = 0;
int use_push_options = 0;
@ -437,6 +486,10 @@ int send_pack(struct send_pack_args *args,
const char *push_cert_nonce = NULL;
struct packet_reader reader;
git_config_get_bool("push.negotiate", &push_negotiate);
if (push_negotiate)
get_commons_through_negotiation(args->url, remote_refs, &commons);
git_config_get_bool("transfer.advertisesid", &advertise_sid);
/* Does the other end support the reporting? */
@ -625,7 +678,7 @@ int send_pack(struct send_pack_args *args,
PACKET_READ_DIE_ON_ERR_PACKET);
if (need_pack_data && cmds_sent) {
if (pack_objects(out, remote_refs, extra_have, args) < 0) {
if (pack_objects(out, remote_refs, extra_have, &commons, args) < 0) {
if (args->stateless_rpc)
close(out);
if (git_connection_is_socket(conn))