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-rwxr-xr-xt/t5552-skipping-fetch-negotiator.sh209
1 files changed, 209 insertions, 0 deletions
diff --git a/t/t5552-skipping-fetch-negotiator.sh b/t/t5552-skipping-fetch-negotiator.sh
new file mode 100755
index 0000000..165427d
--- /dev/null
+++ b/t/t5552-skipping-fetch-negotiator.sh
@@ -0,0 +1,209 @@
+#!/bin/sh
+
+test_description='test skipping fetch negotiator'
+. ./test-lib.sh
+
+have_sent () {
+ while test "$#" -ne 0
+ do
+ grep "fetch> have $(git -C client rev-parse $1)" trace
+ if test $? -ne 0
+ then
+ echo "No have $(git -C client rev-parse $1) ($1)"
+ return 1
+ fi
+ shift
+ done
+}
+
+have_not_sent () {
+ while test "$#" -ne 0
+ do
+ grep "fetch> have $(git -C client rev-parse $1)" trace
+ if test $? -eq 0
+ then
+ return 1
+ fi
+ shift
+ done
+}
+
+# trace_fetch <client_dir> <server_dir> [args]
+#
+# Trace the packet output of fetch, but make sure we disable the variable
+# in the child upload-pack, so we don't combine the results in the same file.
+trace_fetch () {
+ client=$1; shift
+ server=$1; shift
+ GIT_TRACE_PACKET="$(pwd)/trace" \
+ git -C "$client" fetch \
+ --upload-pack 'unset GIT_TRACE_PACKET; git-upload-pack' \
+ "$server" "$@"
+}
+
+test_expect_success 'commits with no parents are sent regardless of skip distance' '
+ git init server &&
+ test_commit -C server to_fetch &&
+
+ git init client &&
+ for i in $(test_seq 7)
+ do
+ test_commit -C client c$i || return 1
+ done &&
+
+ # We send: "c7" (skip 1) "c5" (skip 2) "c2" (skip 4). After that, since
+ # "c1" has no parent, it is still sent as "have" even though it would
+ # normally be skipped.
+ test_config -C client fetch.negotiationalgorithm skipping &&
+ trace_fetch client "$(pwd)/server" &&
+ have_sent c7 c5 c2 c1 &&
+ have_not_sent c6 c4 c3
+'
+
+test_expect_success 'when two skips collide, favor the larger one' '
+ rm -rf server client trace &&
+ git init server &&
+ test_commit -C server to_fetch &&
+
+ git init client &&
+ for i in $(test_seq 11)
+ do
+ test_commit -C client c$i || return 1
+ done &&
+ git -C client checkout c5 &&
+ test_commit -C client c5side &&
+
+ # Before reaching c5, we send "c5side" (skip 1) and "c11" (skip 1) "c9"
+ # (skip 2) "c6" (skip 4). The larger skip (skip 4) takes precedence, so
+ # the next "have" sent will be "c1" (from "c6" skip 4) and not "c4"
+ # (from "c5side" skip 1).
+ test_config -C client fetch.negotiationalgorithm skipping &&
+ trace_fetch client "$(pwd)/server" &&
+ have_sent c5side c11 c9 c6 c1 &&
+ have_not_sent c10 c8 c7 c5 c4 c3 c2
+'
+
+test_expect_success 'use ref advertisement to filter out commits' '
+ rm -rf server client trace &&
+ git init server &&
+ test_commit -C server c1 &&
+ test_commit -C server c2 &&
+ test_commit -C server c3 &&
+ git -C server tag -d c1 c2 c3 &&
+
+ git clone server client &&
+ test_commit -C client c4 &&
+ test_commit -C client c5 &&
+ git -C client checkout c4^^ &&
+ test_commit -C client c2side &&
+
+ git -C server checkout --orphan anotherbranch &&
+ test_commit -C server to_fetch &&
+
+ # The server advertising "c3" (as "refs/heads/main") means that we do
+ # not need to send any ancestors of "c3", but we still need to send "c3"
+ # itself.
+ test_config -C client fetch.negotiationalgorithm skipping &&
+
+ # The ref advertisement itself is filtered when protocol v2 is used, so
+ # use v0.
+ (
+ GIT_TEST_PROTOCOL_VERSION=0 &&
+ export GIT_TEST_PROTOCOL_VERSION &&
+ trace_fetch client origin to_fetch
+ ) &&
+ have_sent c5 c4^ c2side &&
+ have_not_sent c4 c4^^ c4^^^
+'
+
+test_expect_success 'handle clock skew' '
+ rm -rf server client trace &&
+ git init server &&
+ test_commit -C server to_fetch &&
+
+ git init client &&
+
+ # 2 regular commits
+ test_tick=2000000000 &&
+ test_commit -C client c1 &&
+ test_commit -C client c2 &&
+
+ # 4 old commits
+ test_tick=1000000000 &&
+ git -C client checkout c1 &&
+ test_commit -C client old1 &&
+ test_commit -C client old2 &&
+ test_commit -C client old3 &&
+ test_commit -C client old4 &&
+
+ # "c2" and "c1" are popped first, then "old4" to "old1". "old1" would
+ # normally be skipped, but is treated as a commit without a parent here
+ # and sent, because (due to clock skew) its only parent has already been
+ # popped off the priority queue.
+ test_config -C client fetch.negotiationalgorithm skipping &&
+ trace_fetch client "$(pwd)/server" &&
+ have_sent c2 c1 old4 old2 old1 &&
+ have_not_sent old3
+'
+
+test_expect_success 'do not send "have" with ancestors of commits that server ACKed' '
+ rm -rf server client trace &&
+ git init server &&
+ test_commit -C server to_fetch &&
+
+ git init client &&
+ for i in $(test_seq 8)
+ do
+ git -C client checkout --orphan b$i &&
+ test_commit -C client b$i.c0 || return 1
+ done &&
+ for j in $(test_seq 19)
+ do
+ for i in $(test_seq 8)
+ do
+ git -C client checkout b$i &&
+ test_commit -C client b$i.c$j || return 1
+ done
+ done &&
+
+ # Copy this branch over to the server and add a commit on it so that it
+ # is reachable but not advertised.
+ git -C server fetch --no-tags "$(pwd)/client" b1:refs/heads/b1 &&
+ git -C server checkout b1 &&
+ test_commit -C server commit-on-b1 &&
+
+ test_config -C client fetch.negotiationalgorithm skipping &&
+
+ # NEEDSWORK: The number of "have"s sent depends on whether the transport
+ # is stateful. If the overspecification of the result were reduced, this
+ # test could be used for both stateful and stateless transports.
+ (
+ # Force protocol v0, in which local transport is stateful (in
+ # protocol v2 it is stateless).
+ GIT_TEST_PROTOCOL_VERSION=0 &&
+ export GIT_TEST_PROTOCOL_VERSION &&
+ trace_fetch client "$(pwd)/server" to_fetch
+ ) &&
+ grep " fetch" trace &&
+
+ # fetch-pack sends 2 requests each containing 16 "have" lines before
+ # processing the first response. In these 2 requests, 4 commits from
+ # each branch are sent. Just check the first branch.
+ have_sent b1.c19 b1.c17 b1.c14 b1.c9 &&
+ have_not_sent b1.c18 b1.c16 b1.c15 b1.c13 b1.c12 b1.c11 b1.c10 &&
+
+ # While fetch-pack is processing the first response, it should read that
+ # the server ACKs b1.c19 and b1.c17.
+ grep "fetch< ACK $(git -C client rev-parse b1.c19) common" trace &&
+ grep "fetch< ACK $(git -C client rev-parse b1.c17) common" trace &&
+
+ # fetch-pack should thus not send any more commits in the b1 branch, but
+ # should still send the others (in this test, just check b2).
+ for i in $(test_seq 0 8)
+ do
+ have_not_sent b1.c$i || return 1
+ done &&
+ have_sent b2.c1 b2.c0
+'
+
+test_done