t/t5552-skipping-fetch-negotiator.sh

   1 #!/bin/sh
   2
   3 test_description='test skipping fetch negotiator'
   4 . ./test-lib.sh
   5
   6 have_sent () {
   7         while test "$#" -ne 0
   8         do
   9                 grep "fetch> have $(git -C client rev-parse $1)" trace
  10                 if test $? -ne 0
  11                 then
  12                         echo "No have $(git -C client rev-parse $1) ($1)"
  13                         return 1
  14                 fi
  15                 shift
  16         done
  17 }
  18
  19 have_not_sent () {
  20         while test "$#" -ne 0
  21         do
  22                 grep "fetch> have $(git -C client rev-parse $1)" trace
  23                 if test $? -eq 0
  24                 then
  25                         return 1
  26                 fi
  27                 shift
  28         done
  29 }
  30
  31 # trace_fetch <client_dir> <server_dir> [args]
  32 #
  33 # Trace the packet output of fetch, but make sure we disable the variable
  34 # in the child upload-pack, so we don't combine the results in the same file.
  35 trace_fetch () {
  36         client=$1; shift
  37         server=$1; shift
  38         GIT_TRACE_PACKET="$(pwd)/trace" \
  39         git -C "$client" fetch \
  40           --upload-pack 'unset GIT_TRACE_PACKET; git-upload-pack' \
  41           "$server" "$@"
  42 }
  43
  44 test_expect_success 'commits with no parents are sent regardless of skip distance' '
  45         git init server &&
  46         test_commit -C server to_fetch &&
  47
  48         git init client &&
  49         for i in $(test_seq 7)
  50         do
  51                 test_commit -C client c$i
  52         done &&
  53
  54         # We send: "c7" (skip 1) "c5" (skip 2) "c2" (skip 4). After that, since
  55         # "c1" has no parent, it is still sent as "have" even though it would
  56         # normally be skipped.
  57         test_config -C client fetch.negotiationalgorithm skipping &&
  58         trace_fetch client "$(pwd)/server" &&
  59         have_sent c7 c5 c2 c1 &&
  60         have_not_sent c6 c4 c3
  61 '
  62
  63 test_expect_success 'when two skips collide, favor the larger one' '
  64         rm -rf server client trace &&
  65         git init server &&
  66         test_commit -C server to_fetch &&
  67
  68         git init client &&
  69         for i in $(test_seq 11)
  70         do
  71                 test_commit -C client c$i
  72         done &&
  73         git -C client checkout c5 &&
  74         test_commit -C client c5side &&
  75
  76         # Before reaching c5, we send "c5side" (skip 1) and "c11" (skip 1) "c9"
  77         # (skip 2) "c6" (skip 4). The larger skip (skip 4) takes precedence, so
  78         # the next "have" sent will be "c1" (from "c6" skip 4) and not "c4"
  79         # (from "c5side" skip 1).
  80         test_config -C client fetch.negotiationalgorithm skipping &&
  81         trace_fetch client "$(pwd)/server" &&
  82         have_sent c5side c11 c9 c6 c1 &&
  83         have_not_sent c10 c8 c7 c5 c4 c3 c2
  84 '
  85
  86 test_expect_success 'use ref advertisement to filter out commits' '
  87         rm -rf server client trace &&
  88         git init server &&
  89         test_commit -C server c1 &&
  90         test_commit -C server c2 &&
  91         test_commit -C server c3 &&
  92         git -C server tag -d c1 c2 c3 &&
  93
  94         git clone server client &&
  95         test_commit -C client c4 &&
  96         test_commit -C client c5 &&
  97         git -C client checkout c4^^ &&
  98         test_commit -C client c2side &&
  99
 100         git -C server checkout --orphan anotherbranch &&
 101         test_commit -C server to_fetch &&
 102
 103         # The server advertising "c3" (as "refs/heads/main") means that we do
 104         # not need to send any ancestors of "c3", but we still need to send "c3"
 105         # itself.
 106         test_config -C client fetch.negotiationalgorithm skipping &&
 107
 108         # The ref advertisement itself is filtered when protocol v2 is used, so
 109         # use v0.
 110         (
 111                 GIT_TEST_PROTOCOL_VERSION=0 &&
 112                 export GIT_TEST_PROTOCOL_VERSION &&
 113                 trace_fetch client origin to_fetch
 114         ) &&
 115         have_sent c5 c4^ c2side &&
 116         have_not_sent c4 c4^^ c4^^^
 117 '
 118
 119 test_expect_success 'handle clock skew' '
 120         rm -rf server client trace &&
 121         git init server &&
 122         test_commit -C server to_fetch &&
 123
 124         git init client &&
 125
 126         # 2 regular commits
 127         test_tick=2000000000 &&
 128         test_commit -C client c1 &&
 129         test_commit -C client c2 &&
 130
 131         # 4 old commits
 132         test_tick=1000000000 &&
 133         git -C client checkout c1 &&
 134         test_commit -C client old1 &&
 135         test_commit -C client old2 &&
 136         test_commit -C client old3 &&
 137         test_commit -C client old4 &&
 138
 139         # "c2" and "c1" are popped first, then "old4" to "old1". "old1" would
 140         # normally be skipped, but is treated as a commit without a parent here
 141         # and sent, because (due to clock skew) its only parent has already been
 142         # popped off the priority queue.
 143         test_config -C client fetch.negotiationalgorithm skipping &&
 144         trace_fetch client "$(pwd)/server" &&
 145         have_sent c2 c1 old4 old2 old1 &&
 146         have_not_sent old3
 147 '
 148
 149 test_expect_success 'do not send "have" with ancestors of commits that server ACKed' '
 150         rm -rf server client trace &&
 151         git init server &&
 152         test_commit -C server to_fetch &&
 153
 154         git init client &&
 155         for i in $(test_seq 8)
 156         do
 157                 git -C client checkout --orphan b$i &&
 158                 test_commit -C client b$i.c0
 159         done &&
 160         for j in $(test_seq 19)
 161         do
 162                 for i in $(test_seq 8)
 163                 do
 164                         git -C client checkout b$i &&
 165                         test_commit -C client b$i.c$j
 166                 done
 167         done &&
 168
 169         # Copy this branch over to the server and add a commit on it so that it
 170         # is reachable but not advertised.
 171         git -C server fetch --no-tags "$(pwd)/client" b1:refs/heads/b1 &&
 172         git -C server checkout b1 &&
 173         test_commit -C server commit-on-b1 &&
 174
 175         test_config -C client fetch.negotiationalgorithm skipping &&
 176
 177         # NEEDSWORK: The number of "have"s sent depends on whether the transport
 178         # is stateful. If the overspecification of the result were reduced, this
 179         # test could be used for both stateful and stateless transports.
 180         (
 181                 # Force protocol v0, in which local transport is stateful (in
 182                 # protocol v2 it is stateless).
 183                 GIT_TEST_PROTOCOL_VERSION=0 &&
 184                 export GIT_TEST_PROTOCOL_VERSION &&
 185                 trace_fetch client "$(pwd)/server" to_fetch
 186         ) &&
 187         grep "  fetch" trace &&
 188
 189         # fetch-pack sends 2 requests each containing 16 "have" lines before
 190         # processing the first response. In these 2 requests, 4 commits from
 191         # each branch are sent. Just check the first branch.
 192         have_sent b1.c19 b1.c17 b1.c14 b1.c9 &&
 193         have_not_sent b1.c18 b1.c16 b1.c15 b1.c13 b1.c12 b1.c11 b1.c10 &&
 194
 195         # While fetch-pack is processing the first response, it should read that
 196         # the server ACKs b1.c19 and b1.c17.
 197         grep "fetch< ACK $(git -C client rev-parse b1.c19) common" trace &&
 198         grep "fetch< ACK $(git -C client rev-parse b1.c17) common" trace &&
 199
 200         # fetch-pack should thus not send any more commits in the b1 branch, but
 201         # should still send the others (in this test, just check b2).
 202         for i in $(test_seq 0 8)
 203         do
 204                 have_not_sent b1.c$i
 205         done &&
 206         have_sent b2.c1 b2.c0
 207 '
 208
 209 test_done