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diff --git a/t/t5302-pack-index.sh b/t/t5302-pack-index.sh
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+#!/bin/sh
+#
+# Copyright (c) 2007 Nicolas Pitre
+#
+
+test_description='pack index with 64-bit offsets and object CRC'
+. ./test-lib.sh
+
+test_expect_success \
+ 'setup' \
+ 'rm -rf .git &&
+ git init &&
+ git config pack.threads 1 &&
+ i=1 &&
+ while test $i -le 100
+ do
+ iii=$(printf '%03i' $i)
+ test-genrandom "bar" 200 > wide_delta_$iii &&
+ test-genrandom "baz $iii" 50 >> wide_delta_$iii &&
+ test-genrandom "foo"$i 100 > deep_delta_$iii &&
+ test-genrandom "foo"$(expr $i + 1) 100 >> deep_delta_$iii &&
+ test-genrandom "foo"$(expr $i + 2) 100 >> deep_delta_$iii &&
+ echo $iii >file_$iii &&
+ test-genrandom "$iii" 8192 >>file_$iii &&
+ git update-index --add file_$iii deep_delta_$iii wide_delta_$iii &&
+ i=$(expr $i + 1) || return 1
+ done &&
+ { echo 101 && test-genrandom 100 8192; } >file_101 &&
+ git update-index --add file_101 &&
+ tree=$(git write-tree) &&
+ commit=$(git commit-tree $tree </dev/null) && {
+ echo $tree &&
+ git ls-tree $tree | sed -e "s/.* \\([0-9a-f]*\\) .*/\\1/"
+ } >obj-list &&
+ git update-ref HEAD $commit'
+
+test_expect_success \
+ 'pack-objects with index version 1' \
+ 'pack1=$(git pack-objects --index-version=1 test-1 <obj-list) &&
+ git verify-pack -v "test-1-${pack1}.pack"'
+
+test_expect_success \
+ 'pack-objects with index version 2' \
+ 'pack2=$(git pack-objects --index-version=2 test-2 <obj-list) &&
+ git verify-pack -v "test-2-${pack2}.pack"'
+
+test_expect_success \
+ 'both packs should be identical' \
+ 'cmp "test-1-${pack1}.pack" "test-2-${pack2}.pack"'
+
+test_expect_success \
+ 'index v1 and index v2 should be different' \
+ '! cmp "test-1-${pack1}.idx" "test-2-${pack2}.idx"'
+
+test_expect_success \
+ 'index-pack with index version 1' \
+ 'git index-pack --index-version=1 -o 1.idx "test-1-${pack1}.pack"'
+
+test_expect_success \
+ 'index-pack with index version 2' \
+ 'git index-pack --index-version=2 -o 2.idx "test-1-${pack1}.pack"'
+
+test_expect_success \
+ 'index-pack results should match pack-objects ones' \
+ 'cmp "test-1-${pack1}.idx" "1.idx" &&
+ cmp "test-2-${pack2}.idx" "2.idx"'
+
+test_expect_success 'index-pack --verify on index version 1' '
+ git index-pack --verify "test-1-${pack1}.pack"
+'
+
+test_expect_success 'index-pack --verify on index version 2' '
+ git index-pack --verify "test-2-${pack2}.pack"
+'
+
+test_expect_success \
+ 'pack-objects --index-version=2, is not accepted' \
+ 'test_must_fail git pack-objects --index-version=2, test-3 <obj-list'
+
+test_expect_success \
+ 'index v2: force some 64-bit offsets with pack-objects' \
+ 'pack3=$(git pack-objects --index-version=2,0x40000 test-3 <obj-list)'
+
+if msg=$(git verify-pack -v "test-3-${pack3}.pack" 2>&1) ||
+ ! (echo "$msg" | grep "pack too large .* off_t")
+then
+ test_set_prereq OFF64_T
+else
+ say "# skipping tests concerning 64-bit offsets"
+fi
+
+test_expect_success OFF64_T \
+ 'index v2: verify a pack with some 64-bit offsets' \
+ 'git verify-pack -v "test-3-${pack3}.pack"'
+
+test_expect_success OFF64_T \
+ '64-bit offsets: should be different from previous index v2 results' \
+ '! cmp "test-2-${pack2}.idx" "test-3-${pack3}.idx"'
+
+test_expect_success OFF64_T \
+ 'index v2: force some 64-bit offsets with index-pack' \
+ 'git index-pack --index-version=2,0x40000 -o 3.idx "test-1-${pack1}.pack"'
+
+test_expect_success OFF64_T \
+ '64-bit offsets: index-pack result should match pack-objects one' \
+ 'cmp "test-3-${pack3}.idx" "3.idx"'
+
+test_expect_success OFF64_T 'index-pack --verify on 64-bit offset v2 (cheat)' '
+ # This cheats by knowing which lower offset should still be encoded
+ # in 64-bit representation.
+ git index-pack --verify --index-version=2,0x40000 "test-3-${pack3}.pack"
+'
+
+test_expect_success OFF64_T 'index-pack --verify on 64-bit offset v2' '
+ git index-pack --verify "test-3-${pack3}.pack"
+'
+
+# returns the object number for given object in given pack index
+index_obj_nr()
+{
+ idx_file=$1
+ object_sha1=$2
+ nr=0
+ git show-index < $idx_file |
+ while read offs sha1 extra
+ do
+ nr=$(($nr + 1))
+ test "$sha1" = "$object_sha1" || continue
+ echo "$(($nr - 1))"
+ break
+ done
+}
+
+# returns the pack offset for given object as found in given pack index
+index_obj_offset()
+{
+ idx_file=$1
+ object_sha1=$2
+ git show-index < $idx_file | grep $object_sha1 |
+ ( read offs extra && echo "$offs" )
+}
+
+test_expect_success \
+ '[index v1] 1) stream pack to repository' \
+ 'git index-pack --index-version=1 --stdin < "test-1-${pack1}.pack" &&
+ git prune-packed &&
+ git count-objects | ( read nr rest && test "$nr" -eq 1 ) &&
+ cmp "test-1-${pack1}.pack" ".git/objects/pack/pack-${pack1}.pack" &&
+ cmp "test-1-${pack1}.idx" ".git/objects/pack/pack-${pack1}.idx"'
+
+test_expect_success \
+ '[index v1] 2) create a stealth corruption in a delta base reference' \
+ '# This test assumes file_101 is a delta smaller than 16 bytes.
+ # It should be against file_100 but we substitute its base for file_099
+ sha1_101=$(git hash-object file_101) &&
+ sha1_099=$(git hash-object file_099) &&
+ offs_101=$(index_obj_offset 1.idx $sha1_101) &&
+ nr_099=$(index_obj_nr 1.idx $sha1_099) &&
+ chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
+ dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($offs_101 + 1)) \
+ if=".git/objects/pack/pack-${pack1}.idx" \
+ skip=$((4 + 256 * 4 + $nr_099 * 24)) \
+ bs=1 count=20 conv=notrunc &&
+ git cat-file blob $sha1_101 > file_101_foo1'
+
+test_expect_success \
+ '[index v1] 3) corrupted delta happily returned wrong data' \
+ 'test -f file_101_foo1 && ! cmp file_101 file_101_foo1'
+
+test_expect_success \
+ '[index v1] 4) confirm that the pack is actually corrupted' \
+ 'test_must_fail git fsck --full $commit'
+
+test_expect_success \
+ '[index v1] 5) pack-objects happily reuses corrupted data' \
+ 'pack4=$(git pack-objects test-4 <obj-list) &&
+ test -f "test-4-${pack4}.pack"'
+
+test_expect_success \
+ '[index v1] 6) newly created pack is BAD !' \
+ 'test_must_fail git verify-pack -v "test-4-${pack4}.pack"'
+
+test_expect_success \
+ '[index v2] 1) stream pack to repository' \
+ 'rm -f .git/objects/pack/* &&
+ git index-pack --index-version=2 --stdin < "test-1-${pack1}.pack" &&
+ git prune-packed &&
+ git count-objects | ( read nr rest && test "$nr" -eq 1 ) &&
+ cmp "test-1-${pack1}.pack" ".git/objects/pack/pack-${pack1}.pack" &&
+ cmp "test-2-${pack1}.idx" ".git/objects/pack/pack-${pack1}.idx"'
+
+test_expect_success \
+ '[index v2] 2) create a stealth corruption in a delta base reference' \
+ '# This test assumes file_101 is a delta smaller than 16 bytes.
+ # It should be against file_100 but we substitute its base for file_099
+ sha1_101=$(git hash-object file_101) &&
+ sha1_099=$(git hash-object file_099) &&
+ offs_101=$(index_obj_offset 1.idx $sha1_101) &&
+ nr_099=$(index_obj_nr 1.idx $sha1_099) &&
+ chmod +w ".git/objects/pack/pack-${pack1}.pack" &&
+ dd of=".git/objects/pack/pack-${pack1}.pack" seek=$(($offs_101 + 1)) \
+ if=".git/objects/pack/pack-${pack1}.idx" \
+ skip=$((8 + 256 * 4 + $nr_099 * 20)) \
+ bs=1 count=20 conv=notrunc &&
+ git cat-file blob $sha1_101 > file_101_foo2'
+
+test_expect_success \
+ '[index v2] 3) corrupted delta happily returned wrong data' \
+ 'test -f file_101_foo2 && ! cmp file_101 file_101_foo2'
+
+test_expect_success \
+ '[index v2] 4) confirm that the pack is actually corrupted' \
+ 'test_must_fail git fsck --full $commit'
+
+test_expect_success \
+ '[index v2] 5) pack-objects refuses to reuse corrupted data' \
+ 'test_must_fail git pack-objects test-5 <obj-list &&
+ test_must_fail git pack-objects --no-reuse-object test-6 <obj-list'
+
+test_expect_success \
+ '[index v2] 6) verify-pack detects CRC mismatch' \
+ 'rm -f .git/objects/pack/* &&
+ git index-pack --index-version=2 --stdin < "test-1-${pack1}.pack" &&
+ git verify-pack ".git/objects/pack/pack-${pack1}.pack" &&
+ obj=$(git hash-object file_001) &&
+ nr=$(index_obj_nr ".git/objects/pack/pack-${pack1}.idx" $obj) &&
+ chmod +w ".git/objects/pack/pack-${pack1}.idx" &&
+ printf xxxx | dd of=".git/objects/pack/pack-${pack1}.idx" conv=notrunc \
+ bs=1 count=4 seek=$((8 + 256 * 4 + $(wc -l <obj-list) * 20 + $nr * 4)) &&
+ ( while read obj
+ do git cat-file -p $obj >/dev/null || exit 1
+ done <obj-list ) &&
+ test_must_fail git verify-pack ".git/objects/pack/pack-${pack1}.pack"
+'
+
+test_expect_success 'running index-pack in the object store' '
+ rm -f .git/objects/pack/* &&
+ cp test-1-${pack1}.pack .git/objects/pack/pack-${pack1}.pack &&
+ (
+ cd .git/objects/pack
+ git index-pack pack-${pack1}.pack
+ ) &&
+ test -f .git/objects/pack/pack-${pack1}.idx
+'
+
+test_expect_success 'index-pack --strict warns upon missing tagger in tag' '
+ sha=$(git rev-parse HEAD) &&
+ cat >wrong-tag <<EOF &&
+object $sha
+type commit
+tag guten tag
+
+This is an invalid tag.
+EOF
+
+ tag=$(git hash-object -t tag -w --stdin <wrong-tag) &&
+ pack1=$(echo $tag $sha | git pack-objects tag-test) &&
+ echo remove tag object &&
+ thirtyeight=${tag#??} &&
+ rm -f .git/objects/${tag%$thirtyeight}/$thirtyeight &&
+ git index-pack --strict tag-test-${pack1}.pack 2>err &&
+ grep "^warning:.* expected .tagger. line" err
+'
+
+test_done