diff options
Diffstat (limited to 't/t5310-pack-bitmaps.sh')
| -rwxr-xr-x | t/t5310-pack-bitmaps.sh | 111 |
1 files changed, 101 insertions, 10 deletions
diff --git a/t/t5310-pack-bitmaps.sh b/t/t5310-pack-bitmaps.sh index 2d22a17c4a..1be3459c5b 100755 --- a/t/t5310-pack-bitmaps.sh +++ b/t/t5310-pack-bitmaps.sh @@ -9,7 +9,8 @@ objpath () { # show objects present in pack ($1 should be associated *.idx) list_packed_objects () { - git show-index <"$1" | cut -d' ' -f2 + git show-index <"$1" >object-list && + cut -d' ' -f2 object-list } # has_any pattern-file content-file @@ -204,8 +205,8 @@ test_expect_success 'pack-objects to file can use bitmap' ' # verify equivalent packs are generated with/without using bitmap index packasha1=$(git pack-objects --no-use-bitmap-index --all packa </dev/null) && packbsha1=$(git pack-objects --use-bitmap-index --all packb </dev/null) && - list_packed_objects <packa-$packasha1.idx >packa.objects && - list_packed_objects <packb-$packbsha1.idx >packb.objects && + list_packed_objects packa-$packasha1.idx >packa.objects && + list_packed_objects packb-$packbsha1.idx >packb.objects && test_cmp packa.objects packb.objects ' @@ -309,9 +310,8 @@ test_expect_success 'pack reuse respects --honor-pack-keep' ' done && reusable_pack --honor-pack-keep >empty.pack && git index-pack empty.pack && - >expect && git show-index <empty.idx >actual && - test_cmp expect actual + test_must_be_empty actual ' test_expect_success 'pack reuse respects --local' ' @@ -319,17 +319,15 @@ test_expect_success 'pack reuse respects --local' ' test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" && reusable_pack --local >empty.pack && git index-pack empty.pack && - >expect && git show-index <empty.idx >actual && - test_cmp expect actual + test_must_be_empty actual ' test_expect_success 'pack reuse respects --incremental' ' reusable_pack --incremental >empty.pack && git index-pack empty.pack && - >expect && git show-index <empty.idx >actual && - test_cmp expect actual + test_must_be_empty actual ' test_expect_success 'truncated bitmap fails gracefully' ' @@ -337,11 +335,104 @@ test_expect_success 'truncated bitmap fails gracefully' ' git rev-list --use-bitmap-index --count --all >expect && bitmap=$(ls .git/objects/pack/*.bitmap) && test_when_finished "rm -f $bitmap" && - head -c 512 <$bitmap >$bitmap.tmp && + test_copy_bytes 512 <$bitmap >$bitmap.tmp && mv -f $bitmap.tmp $bitmap && git rev-list --use-bitmap-index --count --all >actual 2>stderr && test_cmp expect actual && test_i18ngrep corrupt stderr ' +# have_delta <obj> <expected_base> +# +# Note that because this relies on cat-file, it might find _any_ copy of an +# object in the repository. The caller is responsible for making sure +# there's only one (e.g., via "repack -ad", or having just fetched a copy). +have_delta () { + echo $2 >expect && + echo $1 | git cat-file --batch-check="%(deltabase)" >actual && + test_cmp expect actual +} + +# Create a state of history with these properties: +# +# - refs that allow a client to fetch some new history, while sharing some old +# history with the server; we use branches delta-reuse-old and +# delta-reuse-new here +# +# - the new history contains an object that is stored on the server as a delta +# against a base that is in the old history +# +# - the base object is not immediately reachable from the tip of the old +# history; finding it would involve digging down through history we know the +# other side has +# +# This should result in a state where fetching from old->new would not +# traditionally reuse the on-disk delta (because we'd have to dig to realize +# that the client has it), but we will do so if bitmaps can tell us cheaply +# that the other side has it. +test_expect_success 'set up thin delta-reuse parent' ' + # This first commit contains the buried base object. + test-tool genrandom delta 16384 >file && + git add file && + git commit -m "delta base" && + base=$(git rev-parse --verify HEAD:file) && + + # These intermediate commits bury the base back in history. + # This becomes the "old" state. + for i in 1 2 3 4 5 + do + echo $i >file && + git commit -am "intermediate $i" || return 1 + done && + git branch delta-reuse-old && + + # And now our new history has a delta against the buried base. Note + # that this must be smaller than the original file, since pack-objects + # prefers to create deltas from smaller objects to larger. + test-tool genrandom delta 16300 >file && + git commit -am "delta result" && + delta=$(git rev-parse --verify HEAD:file) && + git branch delta-reuse-new && + + # Repack with bitmaps and double check that we have the expected delta + # relationship. + git repack -adb && + have_delta $delta $base +' + +# Now we can sanity-check the non-bitmap behavior (that the server is not able +# to reuse the delta). This isn't strictly something we care about, so this +# test could be scrapped in the future. But it makes sure that the next test is +# actually triggering the feature we want. +# +# Note that our tools for working with on-the-wire "thin" packs are limited. So +# we actually perform the fetch, retain the resulting pack, and inspect the +# result. +test_expect_success 'fetch without bitmaps ignores delta against old base' ' + test_config pack.usebitmaps false && + test_when_finished "rm -rf client.git" && + git init --bare client.git && + ( + cd client.git && + git config transfer.unpackLimit 1 && + git fetch .. delta-reuse-old:delta-reuse-old && + git fetch .. delta-reuse-new:delta-reuse-new && + have_delta $delta $ZERO_OID + ) +' + +# And do the same for the bitmap case, where we do expect to find the delta. +test_expect_success 'fetch with bitmaps can reuse old base' ' + test_config pack.usebitmaps true && + test_when_finished "rm -rf client.git" && + git init --bare client.git && + ( + cd client.git && + git config transfer.unpackLimit 1 && + git fetch .. delta-reuse-old:delta-reuse-old && + git fetch .. delta-reuse-new:delta-reuse-new && + have_delta $delta $base + ) +' + test_done |