#!/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 \
    '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=$(git pack-objects test-4 <obj-list) &&
     test -f "test-4-${pack1}.pack"'

test_expect_success \
    '[index v1] 6) newly created pack is BAD !' \
    'test_must_fail git verify-pack -v "test-4-${pack1}.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 $obj >/dev/null || exit 1
       done <obj-list ) &&
     err=$(test_must_fail git verify-pack \
       ".git/objects/pack/pack-${pack1}.pack" 2>&1) &&
     echo "$err" | grep "CRC mismatch"'

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_done