#!/bin/sh

test_description='exercise basic bitmap functionality'
. ./test-lib.sh

objpath () {
        echo ".git/objects/$(echo "$1" | sed -e 's|\(..\)|\1/|')"
}

# show objects present in pack ($1 should be associated *.idx)
list_packed_objects () {
        git show-index <"$1" >object-list &&
        cut -d' ' -f2 object-list
}

# has_any pattern-file content-file
# tests whether content-file has any entry from pattern-file with entries being
# whole lines.
has_any () {
        grep -Ff "$1" "$2"
}

test_expect_success 'setup repo with moderate-sized history' '
        for i in $(test_seq 1 10)
        do
                test_commit $i
        done &&
        git checkout -b other HEAD~5 &&
        for i in $(test_seq 1 10)
        do
                test_commit side-$i
        done &&
        git checkout master &&
        bitmaptip=$(git rev-parse master) &&
        blob=$(echo tagged-blob | git hash-object -w --stdin) &&
        git tag tagged-blob $blob &&
        git config repack.writebitmaps true &&
        git config pack.writebitmaphashcache true
'

test_expect_success 'full repack creates bitmaps' '
        git repack -ad &&
        ls .git/objects/pack/ | grep bitmap >output &&
        test_line_count = 1 output
'

test_expect_success 'rev-list --test-bitmap verifies bitmaps' '
        git rev-list --test-bitmap HEAD
'

rev_list_tests() {
        state=$1

        test_expect_success "counting commits via bitmap ($state)" '
                git rev-list --count HEAD >expect &&
                git rev-list --use-bitmap-index --count HEAD >actual &&
                test_cmp expect actual
        '

        test_expect_success "counting partial commits via bitmap ($state)" '
                git rev-list --count HEAD~5..HEAD >expect &&
                git rev-list --use-bitmap-index --count HEAD~5..HEAD >actual &&
                test_cmp expect actual
        '

        test_expect_success "counting commits with limit ($state)" '
                git rev-list --count -n 1 HEAD >expect &&
                git rev-list --use-bitmap-index --count -n 1 HEAD >actual &&
                test_cmp expect actual
        '

        test_expect_success "counting non-linear history ($state)" '
                git rev-list --count other...master >expect &&
                git rev-list --use-bitmap-index --count other...master >actual &&
                test_cmp expect actual
        '

        test_expect_success "counting commits with limiting ($state)" '
                git rev-list --count HEAD -- 1.t >expect &&
                git rev-list --use-bitmap-index --count HEAD -- 1.t >actual &&
                test_cmp expect actual
        '

        test_expect_success "enumerate --objects ($state)" '
                git rev-list --objects --use-bitmap-index HEAD >tmp &&
                cut -d" " -f1 <tmp >tmp2 &&
                sort <tmp2 >actual &&
                git rev-list --objects HEAD >tmp &&
                cut -d" " -f1 <tmp >tmp2 &&
                sort <tmp2 >expect &&
                test_cmp expect actual
        '

        test_expect_success "bitmap --objects handles non-commit objects ($state)" '
                git rev-list --objects --use-bitmap-index HEAD tagged-blob >actual &&
                grep $blob actual
        '
}

rev_list_tests 'full bitmap'

test_expect_success 'clone from bitmapped repository' '
        git clone --no-local --bare . clone.git &&
        git rev-parse HEAD >expect &&
        git --git-dir=clone.git rev-parse HEAD >actual &&
        test_cmp expect actual
'

test_expect_success 'setup further non-bitmapped commits' '
        for i in $(test_seq 1 10)
        do
                test_commit further-$i
        done
'

rev_list_tests 'partial bitmap'

test_expect_success 'fetch (partial bitmap)' '
        git --git-dir=clone.git fetch origin master:master &&
        git rev-parse HEAD >expect &&
        git --git-dir=clone.git rev-parse HEAD >actual &&
        test_cmp expect actual
'

test_expect_success 'incremental repack fails when bitmaps are requested' '
        test_commit more-1 &&
        test_must_fail git repack -d 2>err &&
        test_i18ngrep "Incremental repacks are incompatible with bitmap" err
'

test_expect_success 'incremental repack can disable bitmaps' '
        test_commit more-2 &&
        git repack -d --no-write-bitmap-index
'

test_expect_success 'pack-objects respects --local (non-local loose)' '
        git init --bare alt.git &&
        echo $(pwd)/alt.git/objects >.git/objects/info/alternates &&
        echo content1 >file1 &&
        # non-local loose object which is not present in bitmapped pack
        altblob=$(GIT_DIR=alt.git git hash-object -w file1) &&
        # non-local loose object which is also present in bitmapped pack
        git cat-file blob $blob | GIT_DIR=alt.git git hash-object -w --stdin &&
        git add file1 &&
        test_tick &&
        git commit -m commit_file1 &&
        echo HEAD | git pack-objects --local --stdout --revs >1.pack &&
        git index-pack 1.pack &&
        list_packed_objects 1.idx >1.objects &&
        printf "%s\n" "$altblob" "$blob" >nonlocal-loose &&
        ! has_any nonlocal-loose 1.objects
'

test_expect_success 'pack-objects respects --honor-pack-keep (local non-bitmapped pack)' '
        echo content2 >file2 &&
        blob2=$(git hash-object -w file2) &&
        git add file2 &&
        test_tick &&
        git commit -m commit_file2 &&
        printf "%s\n" "$blob2" "$bitmaptip" >keepobjects &&
        pack2=$(git pack-objects pack2 <keepobjects) &&
        mv pack2-$pack2.* .git/objects/pack/ &&
        >.git/objects/pack/pack2-$pack2.keep &&
        rm $(objpath $blob2) &&
        echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >2a.pack &&
        git index-pack 2a.pack &&
        list_packed_objects 2a.idx >2a.objects &&
        ! has_any keepobjects 2a.objects
'

test_expect_success 'pack-objects respects --local (non-local pack)' '
        mv .git/objects/pack/pack2-$pack2.* alt.git/objects/pack/ &&
        echo HEAD | git pack-objects --local --stdout --revs >2b.pack &&
        git index-pack 2b.pack &&
        list_packed_objects 2b.idx >2b.objects &&
        ! has_any keepobjects 2b.objects
'

test_expect_success 'pack-objects respects --honor-pack-keep (local bitmapped pack)' '
        ls .git/objects/pack/ | grep bitmap >output &&
        test_line_count = 1 output &&
        packbitmap=$(basename $(cat output) .bitmap) &&
        list_packed_objects .git/objects/pack/$packbitmap.idx >packbitmap.objects &&
        test_when_finished "rm -f .git/objects/pack/$packbitmap.keep" &&
        >.git/objects/pack/$packbitmap.keep &&
        echo HEAD | git pack-objects --honor-pack-keep --stdout --revs >3a.pack &&
        git index-pack 3a.pack &&
        list_packed_objects 3a.idx >3a.objects &&
        ! has_any packbitmap.objects 3a.objects
'

test_expect_success 'pack-objects respects --local (non-local bitmapped pack)' '
        mv .git/objects/pack/$packbitmap.* alt.git/objects/pack/ &&
        test_when_finished "mv alt.git/objects/pack/$packbitmap.* .git/objects/pack/" &&
        echo HEAD | git pack-objects --local --stdout --revs >3b.pack &&
        git index-pack 3b.pack &&
        list_packed_objects 3b.idx >3b.objects &&
        ! has_any packbitmap.objects 3b.objects
'

test_expect_success 'pack-objects to file can use bitmap' '
        # make sure we still have 1 bitmap index from previous tests
        ls .git/objects/pack/ | grep bitmap >output &&
        test_line_count = 1 output &&
        # 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 &&
        test_cmp packa.objects packb.objects
'

test_expect_success 'full repack, reusing previous bitmaps' '
        git repack -ad &&
        ls .git/objects/pack/ | grep bitmap >output &&
        test_line_count = 1 output
'

test_expect_success 'fetch (full bitmap)' '
        git --git-dir=clone.git fetch origin master:master &&
        git rev-parse HEAD >expect &&
        git --git-dir=clone.git rev-parse HEAD >actual &&
        test_cmp expect actual
'

test_expect_success 'create objects for missing-HAVE tests' '
        blob=$(echo "missing have" | git hash-object -w --stdin) &&
        tree=$(printf "100644 blob $blob\tfile\n" | git mktree) &&
        parent=$(echo parent | git commit-tree $tree) &&
        commit=$(echo commit | git commit-tree $tree -p $parent) &&
        cat >revs <<-EOF
        HEAD
        ^HEAD^
        ^$commit
        EOF
'

test_expect_success 'pack-objects respects --incremental' '
        cat >revs2 <<-EOF &&
        HEAD
        $commit
        EOF
        git pack-objects --incremental --stdout --revs <revs2 >4.pack &&
        git index-pack 4.pack &&
        list_packed_objects 4.idx >4.objects &&
        test_line_count = 4 4.objects &&
        git rev-list --objects $commit >revlist &&
        cut -d" " -f1 revlist |sort >objects &&
        test_cmp 4.objects objects
'

test_expect_success 'pack with missing blob' '
        rm $(objpath $blob) &&
        git pack-objects --stdout --revs <revs >/dev/null
'

test_expect_success 'pack with missing tree' '
        rm $(objpath $tree) &&
        git pack-objects --stdout --revs <revs >/dev/null
'

test_expect_success 'pack with missing parent' '
        rm $(objpath $parent) &&
        git pack-objects --stdout --revs <revs >/dev/null
'

test_expect_success JGIT 'we can read jgit bitmaps' '
        git clone --bare . compat-jgit.git &&
        (
                cd compat-jgit.git &&
                rm -f .git/objects/pack/*.bitmap &&
                jgit gc &&
                git rev-list --test-bitmap HEAD
        )
'

test_expect_success JGIT 'jgit can read our bitmaps' '
        git clone --bare . compat-us.git &&
        (
                cd compat-us.git &&
                git repack -adb &&
                # jgit gc will barf if it does not like our bitmaps
                jgit gc
        )
'

test_expect_success 'splitting packs does not generate bogus bitmaps' '
        test-tool genrandom foo $((1024 * 1024)) >rand &&
        git add rand &&
        git commit -m "commit with big file" &&
        git -c pack.packSizeLimit=500k repack -adb &&
        git init --bare no-bitmaps.git &&
        git -C no-bitmaps.git fetch .. HEAD
'

test_expect_success 'set up reusable pack' '
        rm -f .git/objects/pack/*.keep &&
        git repack -adb &&
        reusable_pack () {
                git for-each-ref --format="%(objectname)" |
                git pack-objects --delta-base-offset --revs --stdout "$@"
        }
'

test_expect_success 'pack reuse respects --honor-pack-keep' '
        test_when_finished "rm -f .git/objects/pack/*.keep" &&
        for i in .git/objects/pack/*.pack
        do
                >${i%.pack}.keep
        done &&
        reusable_pack --honor-pack-keep >empty.pack &&
        git index-pack empty.pack &&
        git show-index <empty.idx >actual &&
        test_must_be_empty actual
'

test_expect_success 'pack reuse respects --local' '
        mv .git/objects/pack/* alt.git/objects/pack/ &&
        test_when_finished "mv alt.git/objects/pack/* .git/objects/pack/" &&
        reusable_pack --local >empty.pack &&
        git index-pack empty.pack &&
        git show-index <empty.idx >actual &&
        test_must_be_empty actual
'

test_expect_success 'pack reuse respects --incremental' '
        reusable_pack --incremental >empty.pack &&
        git index-pack empty.pack &&
        git show-index <empty.idx >actual &&
        test_must_be_empty actual
'

test_expect_success 'truncated bitmap fails gracefully' '
        git repack -ad &&
        git rev-list --use-bitmap-index --count --all >expect &&
        bitmap=$(ls .git/objects/pack/*.bitmap) &&
        test_when_finished "rm -f $bitmap" &&
        test_copy_bytes 512 <$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