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-rwxr-xr-xt/t5332-multi-pack-reuse.sh207
1 files changed, 207 insertions, 0 deletions
diff --git a/t/t5332-multi-pack-reuse.sh b/t/t5332-multi-pack-reuse.sh
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--- /dev/null
+++ b/t/t5332-multi-pack-reuse.sh
@@ -0,0 +1,207 @@
+#!/bin/sh
+
+test_description='pack-objects multi-pack reuse'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-bitmap.sh
+
+objdir=.git/objects
+packdir=$objdir/pack
+
+test_pack_reused () {
+ test_trace2_data pack-objects pack-reused "$1"
+}
+
+test_packs_reused () {
+ test_trace2_data pack-objects packs-reused "$1"
+}
+
+
+# pack_position <object> </path/to/pack.idx
+pack_position () {
+ git show-index >objects &&
+ grep "$1" objects | cut -d" " -f1
+}
+
+# test_pack_objects_reused_all <pack-reused> <packs-reused>
+test_pack_objects_reused_all () {
+ : >trace2.txt &&
+ GIT_TRACE2_EVENT="$PWD/trace2.txt" \
+ git pack-objects --stdout --revs --all --delta-base-offset \
+ >/dev/null &&
+
+ test_pack_reused "$1" <trace2.txt &&
+ test_packs_reused "$2" <trace2.txt
+}
+
+# test_pack_objects_reused <pack-reused> <packs-reused>
+test_pack_objects_reused () {
+ : >trace2.txt &&
+ GIT_TRACE2_EVENT="$PWD/trace2.txt" \
+ git pack-objects --stdout --revs >/dev/null &&
+
+ test_pack_reused "$1" <trace2.txt &&
+ test_packs_reused "$2" <trace2.txt
+}
+
+test_expect_success 'preferred pack is reused for single-pack reuse' '
+ test_config pack.allowPackReuse single &&
+
+ for i in A B
+ do
+ test_commit "$i" &&
+ git repack -d || return 1
+ done &&
+
+ git multi-pack-index write --bitmap &&
+
+ test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'multi-pack reuse is disabled by default' '
+ test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'feature.experimental implies multi-pack reuse' '
+ test_config feature.experimental true &&
+
+ test_pack_objects_reused_all 6 2
+'
+
+test_expect_success 'multi-pack reuse can be disabled with feature.experimental' '
+ test_config feature.experimental true &&
+ test_config pack.allowPackReuse single &&
+
+ test_pack_objects_reused_all 3 1
+'
+
+test_expect_success 'enable multi-pack reuse' '
+ git config pack.allowPackReuse multi
+'
+
+test_expect_success 'reuse all objects from subset of bitmapped packs' '
+ test_commit C &&
+ git repack -d &&
+
+ git multi-pack-index write --bitmap &&
+
+ cat >in <<-EOF &&
+ $(git rev-parse C)
+ ^$(git rev-parse A)
+ EOF
+
+ test_pack_objects_reused 6 2 <in
+'
+
+test_expect_success 'reuse all objects from all packs' '
+ test_pack_objects_reused_all 9 3
+'
+
+test_expect_success 'reuse objects from first pack with middle gap' '
+ for i in D E F
+ do
+ test_commit "$i" || return 1
+ done &&
+
+ # Set "pack.window" to zero to ensure that we do not create any
+ # deltas, which could alter the amount of pack reuse we perform
+ # (if, for e.g., we are not sending one or more bases).
+ D="$(git -c pack.window=0 pack-objects --all --unpacked $packdir/pack)" &&
+
+ d_pos="$(pack_position $(git rev-parse D) <$packdir/pack-$D.idx)" &&
+ e_pos="$(pack_position $(git rev-parse E) <$packdir/pack-$D.idx)" &&
+ f_pos="$(pack_position $(git rev-parse F) <$packdir/pack-$D.idx)" &&
+
+ # commits F, E, and D, should appear in that order at the
+ # beginning of the pack
+ test $f_pos -lt $e_pos &&
+ test $e_pos -lt $d_pos &&
+
+ # Ensure that the pack we are constructing sorts ahead of any
+ # other packs in lexical/bitmap order by choosing it as the
+ # preferred pack.
+ git multi-pack-index write --bitmap --preferred-pack="pack-$D.idx" &&
+
+ cat >in <<-EOF &&
+ $(git rev-parse E)
+ ^$(git rev-parse D)
+ EOF
+
+ test_pack_objects_reused 3 1 <in
+'
+
+test_expect_success 'reuse objects from middle pack with middle gap' '
+ rm -fr $packdir/multi-pack-index* &&
+
+ # Ensure that the pack we are constructing sort into any
+ # position *but* the first one, by choosing a different pack as
+ # the preferred one.
+ git multi-pack-index write --bitmap --preferred-pack="pack-$A.idx" &&
+
+ cat >in <<-EOF &&
+ $(git rev-parse E)
+ ^$(git rev-parse D)
+ EOF
+
+ test_pack_objects_reused 3 1 <in
+'
+
+test_expect_success 'omit delta with uninteresting base (same pack)' '
+ git repack -adk &&
+
+ test_seq 32 >f &&
+ git add f &&
+ test_tick &&
+ git commit -m "delta" &&
+ delta="$(git rev-parse HEAD)" &&
+
+ test_seq 64 >f &&
+ test_tick &&
+ git commit -a -m "base" &&
+ base="$(git rev-parse HEAD)" &&
+
+ test_commit other &&
+
+ git repack -d &&
+
+ have_delta "$(git rev-parse $delta:f)" "$(git rev-parse $base:f)" &&
+
+ git multi-pack-index write --bitmap &&
+
+ cat >in <<-EOF &&
+ $(git rev-parse other)
+ ^$base
+ EOF
+
+ # We can only reuse the 3 objects corresponding to "other" from
+ # the latest pack.
+ #
+ # This is because even though we want "delta", we do not want
+ # "base", meaning that we have to inflate the delta/base-pair
+ # corresponding to the blob in commit "delta", which bypasses
+ # the pack-reuse mechanism.
+ #
+ # The remaining objects from the other pack are similarly not
+ # reused because their objects are on the uninteresting side of
+ # the query.
+ test_pack_objects_reused 3 1 <in
+'
+
+test_expect_success 'omit delta from uninteresting base (cross pack)' '
+ cat >in <<-EOF &&
+ $(git rev-parse $base)
+ ^$(git rev-parse $delta)
+ EOF
+
+ P="$(git pack-objects --revs $packdir/pack <in)" &&
+
+ git multi-pack-index write --bitmap --preferred-pack="pack-$P.idx" &&
+
+ packs_nr="$(find $packdir -type f -name "pack-*.pack" | wc -l)" &&
+ objects_nr="$(git rev-list --count --all --objects)" &&
+
+ test_pack_objects_reused_all $(($objects_nr - 1)) $packs_nr
+'
+
+test_done