t/t5332-multi-pack-reuse.sh

   1 #!/bin/sh
   2
   3 test_description='pack-objects multi-pack reuse'
   4
   5 TEST_PASSES_SANITIZE_LEAK=true
   6 . ./test-lib.sh
   7 . "$TEST_DIRECTORY"/lib-bitmap.sh
   8
   9 objdir=.git/objects
  10 packdir=$objdir/pack
  11
  12 test_pack_reused () {
  13         test_trace2_data pack-objects pack-reused "$1"
  14 }
  15
  16 test_packs_reused () {
  17         test_trace2_data pack-objects packs-reused "$1"
  18 }
  19
  20
  21 # pack_position <object> </path/to/pack.idx
  22 pack_position () {
  23         git show-index >objects &&
  24         grep "$1" objects | cut -d" " -f1
  25 }
  26
  27 # test_pack_objects_reused_all <pack-reused> <packs-reused>
  28 test_pack_objects_reused_all () {
  29         : >trace2.txt &&
  30         GIT_TRACE2_EVENT="$PWD/trace2.txt" \
  31                 git pack-objects --stdout --revs --all --delta-base-offset \
  32                 >/dev/null &&
  33
  34         test_pack_reused "$1" <trace2.txt &&
  35         test_packs_reused "$2" <trace2.txt
  36 }
  37
  38 # test_pack_objects_reused <pack-reused> <packs-reused>
  39 test_pack_objects_reused () {
  40         : >trace2.txt &&
  41         GIT_TRACE2_EVENT="$PWD/trace2.txt" \
  42                 git pack-objects --stdout --revs >/dev/null &&
  43
  44         test_pack_reused "$1" <trace2.txt &&
  45         test_packs_reused "$2" <trace2.txt
  46 }
  47
  48 test_expect_success 'preferred pack is reused for single-pack reuse' '
  49         test_config pack.allowPackReuse single &&
  50
  51         for i in A B
  52         do
  53                 test_commit "$i" &&
  54                 git repack -d || return 1
  55         done &&
  56
  57         git multi-pack-index write --bitmap &&
  58
  59         test_pack_objects_reused_all 3 1
  60 '
  61
  62 test_expect_success 'multi-pack reuse is disabled by default' '
  63         test_pack_objects_reused_all 3 1
  64 '
  65
  66 test_expect_success 'feature.experimental implies multi-pack reuse' '
  67         test_config feature.experimental true &&
  68
  69         test_pack_objects_reused_all 6 2
  70 '
  71
  72 test_expect_success 'multi-pack reuse can be disabled with feature.experimental' '
  73         test_config feature.experimental true &&
  74         test_config pack.allowPackReuse single &&
  75
  76         test_pack_objects_reused_all 3 1
  77 '
  78
  79 test_expect_success 'enable multi-pack reuse' '
  80         git config pack.allowPackReuse multi
  81 '
  82
  83 test_expect_success 'reuse all objects from subset of bitmapped packs' '
  84         test_commit C &&
  85         git repack -d &&
  86
  87         git multi-pack-index write --bitmap &&
  88
  89         cat >in <<-EOF &&
  90         $(git rev-parse C)
  91         ^$(git rev-parse A)
  92         EOF
  93
  94         test_pack_objects_reused 6 2 <in
  95 '
  96
  97 test_expect_success 'reuse all objects from all packs' '
  98         test_pack_objects_reused_all 9 3
  99 '
 100
 101 test_expect_success 'reuse objects from first pack with middle gap' '
 102         for i in D E F
 103         do
 104                 test_commit "$i" || return 1
 105         done &&
 106
 107         # Set "pack.window" to zero to ensure that we do not create any
 108         # deltas, which could alter the amount of pack reuse we perform
 109         # (if, for e.g., we are not sending one or more bases).
 110         D="$(git -c pack.window=0 pack-objects --all --unpacked $packdir/pack)" &&
 111
 112         d_pos="$(pack_position $(git rev-parse D) <$packdir/pack-$D.idx)" &&
 113         e_pos="$(pack_position $(git rev-parse E) <$packdir/pack-$D.idx)" &&
 114         f_pos="$(pack_position $(git rev-parse F) <$packdir/pack-$D.idx)" &&
 115
 116         # commits F, E, and D, should appear in that order at the
 117         # beginning of the pack
 118         test $f_pos -lt $e_pos &&
 119         test $e_pos -lt $d_pos &&
 120
 121         # Ensure that the pack we are constructing sorts ahead of any
 122         # other packs in lexical/bitmap order by choosing it as the
 123         # preferred pack.
 124         git multi-pack-index write --bitmap --preferred-pack="pack-$D.idx" &&
 125
 126         cat >in <<-EOF &&
 127         $(git rev-parse E)
 128         ^$(git rev-parse D)
 129         EOF
 130
 131         test_pack_objects_reused 3 1 <in
 132 '
 133
 134 test_expect_success 'reuse objects from middle pack with middle gap' '
 135         rm -fr $packdir/multi-pack-index* &&
 136
 137         # Ensure that the pack we are constructing sort into any
 138         # position *but* the first one, by choosing a different pack as
 139         # the preferred one.
 140         git multi-pack-index write --bitmap --preferred-pack="pack-$A.idx" &&
 141
 142         cat >in <<-EOF &&
 143         $(git rev-parse E)
 144         ^$(git rev-parse D)
 145         EOF
 146
 147         test_pack_objects_reused 3 1 <in
 148 '
 149
 150 test_expect_success 'omit delta with uninteresting base (same pack)' '
 151         git repack -adk &&
 152
 153         test_seq 32 >f &&
 154         git add f &&
 155         test_tick &&
 156         git commit -m "delta" &&
 157         delta="$(git rev-parse HEAD)" &&
 158
 159         test_seq 64 >f &&
 160         test_tick &&
 161         git commit -a -m "base" &&
 162         base="$(git rev-parse HEAD)" &&
 163
 164         test_commit other &&
 165
 166         git repack -d &&
 167
 168         have_delta "$(git rev-parse $delta:f)" "$(git rev-parse $base:f)" &&
 169
 170         git multi-pack-index write --bitmap &&
 171
 172         cat >in <<-EOF &&
 173         $(git rev-parse other)
 174         ^$base
 175         EOF
 176
 177         # We can only reuse the 3 objects corresponding to "other" from
 178         # the latest pack.
 179         #
 180         # This is because even though we want "delta", we do not want
 181         # "base", meaning that we have to inflate the delta/base-pair
 182         # corresponding to the blob in commit "delta", which bypasses
 183         # the pack-reuse mechanism.
 184         #
 185         # The remaining objects from the other pack are similarly not
 186         # reused because their objects are on the uninteresting side of
 187         # the query.
 188         test_pack_objects_reused 3 1 <in
 189 '
 190
 191 test_expect_success 'omit delta from uninteresting base (cross pack)' '
 192         cat >in <<-EOF &&
 193         $(git rev-parse $base)
 194         ^$(git rev-parse $delta)
 195         EOF
 196
 197         P="$(git pack-objects --revs $packdir/pack <in)" &&
 198
 199         git multi-pack-index write --bitmap --preferred-pack="pack-$P.idx" &&
 200
 201         packs_nr="$(find $packdir -type f -name "pack-*.pack" | wc -l)" &&
 202         objects_nr="$(git rev-list --count --all --objects)" &&
 203
 204         test_pack_objects_reused_all $(($objects_nr - 1)) $packs_nr
 205 '
 206
 207 test_done