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authorJonathan Tan <jonathantanmy@google.com>2021-05-04 21:16:02 (GMT)
committerJunio C Hamano <gitster@pobox.com>2021-05-05 01:41:29 (GMT)
commit477673d6f39b4829baa98ad88d6b65b35b79fd0f (patch)
tree78f7ac9dc9b5607b2d18fbb1704e7448280e7bf2
parent9c1e657a8fd26fa3ed8d13fb8c796cef8db8b124 (diff)
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send-pack: support push negotiation
Teach Git the push.negotiate config variable. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--Documentation/config/push.txt7
-rw-r--r--send-pack.c61
-rwxr-xr-xt/t5516-fetch-push.sh35
3 files changed, 99 insertions, 4 deletions
diff --git a/Documentation/config/push.txt b/Documentation/config/push.txt
index 21b256e..f2667b2 100644
--- a/Documentation/config/push.txt
+++ b/Documentation/config/push.txt
@@ -120,3 +120,10 @@ push.useForceIfIncludes::
`--force-if-includes` as an option to linkgit:git-push[1]
in the command line. Adding `--no-force-if-includes` at the
time of push overrides this configuration setting.
+
+push.negotiate::
+ If set to "true", attempt to reduce the size of the packfile
+ sent by rounds of negotiation in which the client and the
+ server attempt to find commits in common. If "false", Git will
+ rely solely on the server's ref advertisement to find commits
+ in common.
diff --git a/send-pack.c b/send-pack.c
index 5f215b1..9cb9f71 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -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))
diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index f11742e..0916f76 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh
@@ -191,6 +191,41 @@ test_expect_success 'fetch with pushInsteadOf (should not rewrite)' '
)
'
+grep_wrote () {
+ object_count=$1
+ file_name=$2
+ grep 'write_pack_file/wrote.*"value":"'$1'"' $2
+}
+
+test_expect_success 'push with negotiation' '
+ # Without negotiation
+ mk_empty testrepo &&
+ git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+ git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+ echo now pushing without negotiation &&
+ GIT_TRACE2_EVENT="$(pwd)/event" git -c protocol.version=2 push testrepo refs/heads/main:refs/remotes/origin/main &&
+ grep_wrote 5 event && # 2 commits, 2 trees, 1 blob
+
+ # Same commands, but with negotiation
+ rm event &&
+ mk_empty testrepo &&
+ git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+ git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+ GIT_TRACE2_EVENT="$(pwd)/event" git -c protocol.version=2 -c push.negotiate=1 push testrepo refs/heads/main:refs/remotes/origin/main &&
+ grep_wrote 2 event # 1 commit, 1 tree
+'
+
+test_expect_success 'push with negotiation proceeds anyway even if negotiation fails' '
+ rm event &&
+ mk_empty testrepo &&
+ git push testrepo $the_first_commit:refs/remotes/origin/first_commit &&
+ git -C testrepo config receive.hideRefs refs/remotes/origin/first_commit &&
+ GIT_TEST_PROTOCOL_VERSION=0 GIT_TRACE2_EVENT="$(pwd)/event" \
+ git -c push.negotiate=1 push testrepo refs/heads/main:refs/remotes/origin/main 2>err &&
+ grep_wrote 5 event && # 2 commits, 2 trees, 1 blob
+ test_i18ngrep "push negotiation failed" err
+'
+
test_expect_success 'push without wildcard' '
mk_empty testrepo &&