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fetch-pack: in protocol v2, reset in_vain upon ACK

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In the function process_acks() in fetch-pack.c, the variable
received_ack is meant to track that an ACK was received, but it was
never set. This results in negotiation terminating prematurely through
the in_vain counter, when the counter should have been reset upon every
ACK.

Therefore, reset the in_vain counter upon every ACK.

Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan 2020-04-27 17:01:10 -07:00 committed by Junio C Hamano
parent 4fa3f00abb
commit 2f0a093dd6
2 changed files with 31 additions and 0 deletions
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1
fetch-pack.c
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@ -1307,6 +1307,7 @@ static enum common_found process_acks(struct fetch_negotiator *negotiator,
if (skip_prefix(reader->line, "ACK ", &arg)) {
struct object_id oid;
received_ack = 1;
if (!get_oid_hex(arg, &oid)) {
struct commit *commit;
oidset_insert(common, &oid);

30
t/t5500-fetch-pack.sh
View file

@ -403,6 +403,36 @@ test_expect_success 'in_vain not triggered before first ACK' '
test_i18ngrep "Total 3 " trace
'
test_expect_success 'in_vain resetted upon ACK' '
rm -rf myserver myclient trace &&
git init myserver &&
# Linked list of commits on master. The first is common; the rest are
# not.
test_commit -C myserver first_master_commit &&
git clone "file://$(pwd)/myserver" myclient &&
test_commit_bulk -C myclient 255 &&
# Another linked list of commits on anotherbranch with no connection to
# master. The first is common; the rest are not.
git -C myserver checkout --orphan anotherbranch &&
test_commit -C myserver first_anotherbranch_commit &&
git -C myclient fetch origin anotherbranch:refs/heads/anotherbranch &&
git -C myclient checkout anotherbranch &&
test_commit_bulk -C myclient 255 &&
# The new commit that the client wants to fetch.
git -C myserver checkout master &&
test_commit -C myserver to_fetch &&
# The client will send (as "have"s) all 256 commits in anotherbranch
# first. The 256th commit is common between the client and the server,
# and should reset in_vain. This allows negotiation to continue until
# the client reports that first_anotherbranch_commit is common.
GIT_TRACE_PACKET="$(pwd)/trace" git -C myclient fetch --progress origin master &&
test_i18ngrep "Total 3 " trace
'
test_expect_success 'fetch in shallow repo unreachable shallow objects' '
(
git clone --bare --branch B --single-branch "file://$(pwd)/." no-reflog &&