t/t5303-pack-corruption-resilience.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2008 Nicolas Pitre
   4 #
   5
   6 test_description='resilience to pack corruptions with redundant objects'
   7 . ./test-lib.sh
   8
   9 # Note: the test objects are created with knowledge of their pack encoding
  10 # to ensure good code path coverage, and to facilitate direct alteration
  11 # later on.  The assumed characteristics are:
  12 #
  13 # 1) blob_2 is a delta with blob_1 for base and blob_3 is a delta with blob2
  14 #    for base, such that blob_3 delta depth is 2;
  15 #
  16 # 2) the bulk of object data is uncompressible so the text part remains
  17 #    visible;
  18 #
  19 # 3) object header is always 2 bytes.
  20
  21 create_test_files() {
  22     test-genrandom "foo" 2000 > file_1 &&
  23     test-genrandom "foo" 1800 > file_2 &&
  24     test-genrandom "foo" 1800 > file_3 &&
  25     echo " base " >> file_1 &&
  26     echo " delta1 " >> file_2 &&
  27     echo " delta delta2 " >> file_3 &&
  28     test-genrandom "bar" 150 >> file_2 &&
  29     test-genrandom "baz" 100 >> file_3
  30 }
  31
  32 create_new_pack() {
  33     rm -rf .git &&
  34     git init &&
  35     blob_1=`git hash-object -t blob -w file_1` &&
  36     blob_2=`git hash-object -t blob -w file_2` &&
  37     blob_3=`git hash-object -t blob -w file_3` &&
  38     pack=`printf "$blob_1\n$blob_2\n$blob_3\n" |
  39           git pack-objects $@ .git/objects/pack/pack` &&
  40     pack=".git/objects/pack/pack-${pack}" &&
  41     git verify-pack -v ${pack}.pack
  42 }
  43
  44 do_corrupt_object() {
  45     ofs=`git show-index < ${pack}.idx | grep $1 | cut -f1 -d" "` &&
  46     ofs=$(($ofs + $2)) &&
  47     chmod +w ${pack}.pack &&
  48     dd if=/dev/zero of=${pack}.pack count=1 bs=1 conv=notrunc seek=$ofs &&
  49     test_must_fail git verify-pack ${pack}.pack
  50 }
  51
  52 test_expect_success \
  53     'initial setup validation' \
  54     'create_test_files &&
  55      create_new_pack &&
  56      git prune-packed &&
  57      git cat-file blob $blob_1 > /dev/null &&
  58      git cat-file blob $blob_2 > /dev/null &&
  59      git cat-file blob $blob_3 > /dev/null'
  60
  61 test_expect_success \
  62     'create corruption in header of first object' \
  63     'do_corrupt_object $blob_1 0 &&
  64      test_must_fail git cat-file blob $blob_1 > /dev/null &&
  65      test_must_fail git cat-file blob $blob_2 > /dev/null &&
  66      test_must_fail git cat-file blob $blob_3 > /dev/null'
  67
  68 test_expect_success \
  69     '... but having a loose copy allows for full recovery' \
  70     'mv ${pack}.idx tmp &&
  71      git hash-object -t blob -w file_1 &&
  72      mv tmp ${pack}.idx &&
  73      git cat-file blob $blob_1 > /dev/null &&
  74      git cat-file blob $blob_2 > /dev/null &&
  75      git cat-file blob $blob_3 > /dev/null'
  76
  77 test_expect_success \
  78     '... and loose copy of first delta allows for partial recovery' \
  79     'git prune-packed &&
  80      test_must_fail git cat-file blob $blob_2 > /dev/null &&
  81      mv ${pack}.idx tmp &&
  82      git hash-object -t blob -w file_2 &&
  83      mv tmp ${pack}.idx &&
  84      test_must_fail git cat-file blob $blob_1 > /dev/null &&
  85      git cat-file blob $blob_2 > /dev/null &&
  86      git cat-file blob $blob_3 > /dev/null'
  87
  88 test_expect_success \
  89     'create corruption in data of first object' \
  90     'create_new_pack &&
  91      git prune-packed &&
  92      chmod +w ${pack}.pack &&
  93      perl -i.bak -pe "s/ base /abcdef/" ${pack}.pack &&
  94      test_must_fail git cat-file blob $blob_1 > /dev/null &&
  95      test_must_fail git cat-file blob $blob_2 > /dev/null &&
  96      test_must_fail git cat-file blob $blob_3 > /dev/null'
  97
  98 test_expect_success \
  99     '... but having a loose copy allows for full recovery' \
 100     'mv ${pack}.idx tmp &&
 101      git hash-object -t blob -w file_1 &&
 102      mv tmp ${pack}.idx &&
 103      git cat-file blob $blob_1 > /dev/null &&
 104      git cat-file blob $blob_2 > /dev/null &&
 105      git cat-file blob $blob_3 > /dev/null'
 106
 107 test_expect_success \
 108     '... and loose copy of second object allows for partial recovery' \
 109     'git prune-packed &&
 110      test_must_fail git cat-file blob $blob_2 > /dev/null &&
 111      mv ${pack}.idx tmp &&
 112      git hash-object -t blob -w file_2 &&
 113      mv tmp ${pack}.idx &&
 114      test_must_fail git cat-file blob $blob_1 > /dev/null &&
 115      git cat-file blob $blob_2 > /dev/null &&
 116      git cat-file blob $blob_3 > /dev/null'
 117
 118 test_expect_success \
 119     'create corruption in header of first delta' \
 120     'create_new_pack &&
 121      git prune-packed &&
 122      do_corrupt_object $blob_2 0 &&
 123      git cat-file blob $blob_1 > /dev/null &&
 124      test_must_fail git cat-file blob $blob_2 > /dev/null &&
 125      test_must_fail git cat-file blob $blob_3 > /dev/null'
 126
 127 test_expect_success \
 128     '... but having a loose copy allows for full recovery' \
 129     'mv ${pack}.idx tmp &&
 130      git hash-object -t blob -w file_2 &&
 131      mv tmp ${pack}.idx &&
 132      git cat-file blob $blob_1 > /dev/null &&
 133      git cat-file blob $blob_2 > /dev/null &&
 134      git cat-file blob $blob_3 > /dev/null'
 135
 136 test_expect_success \
 137     'create corruption in data of first delta' \
 138     'create_new_pack &&
 139      git prune-packed &&
 140      chmod +w ${pack}.pack &&
 141      perl -i.bak -pe "s/ delta1 /abcdefgh/" ${pack}.pack &&
 142      git cat-file blob $blob_1 > /dev/null &&
 143      test_must_fail git cat-file blob $blob_2 > /dev/null &&
 144      test_must_fail git cat-file blob $blob_3 > /dev/null'
 145
 146 test_expect_success \
 147     '... but having a loose copy allows for full recovery' \
 148     'mv ${pack}.idx tmp &&
 149      git hash-object -t blob -w file_2 &&
 150      mv tmp ${pack}.idx &&
 151      git cat-file blob $blob_1 > /dev/null &&
 152      git cat-file blob $blob_2 > /dev/null &&
 153      git cat-file blob $blob_3 > /dev/null'
 154
 155 test_expect_success \
 156     'corruption in delta base reference of first delta (OBJ_REF_DELTA)' \
 157     'create_new_pack &&
 158      git prune-packed &&
 159      do_corrupt_object $blob_2 2 &&
 160      git cat-file blob $blob_1 > /dev/null &&
 161      test_must_fail git cat-file blob $blob_2 > /dev/null &&
 162      test_must_fail git cat-file blob $blob_3 > /dev/null'
 163
 164 test_expect_success \
 165     '... but having a loose copy allows for full recovery' \
 166     'mv ${pack}.idx tmp &&
 167      git hash-object -t blob -w file_2 &&
 168      mv tmp ${pack}.idx &&
 169      git cat-file blob $blob_1 > /dev/null &&
 170      git cat-file blob $blob_2 > /dev/null &&
 171      git cat-file blob $blob_3 > /dev/null'
 172
 173 test_expect_success \
 174     'corruption in delta base reference of first delta (OBJ_OFS_DELTA)' \
 175     'create_new_pack --delta-base-offset &&
 176      git prune-packed &&
 177      do_corrupt_object $blob_2 2 &&
 178      git cat-file blob $blob_1 > /dev/null &&
 179      test_must_fail git cat-file blob $blob_2 > /dev/null &&
 180      test_must_fail git cat-file blob $blob_3 > /dev/null'
 181
 182 test_expect_success \
 183     '... and a redundant pack allows for full recovery too' \
 184     'mv ${pack}.idx tmp &&
 185      git hash-object -t blob -w file_1 &&
 186      git hash-object -t blob -w file_2 &&
 187      printf "$blob_1\n$blob_2\n" | git pack-objects .git/objects/pack/pack &&
 188      git prune-packed &&
 189      mv tmp ${pack}.idx &&
 190      git cat-file blob $blob_1 > /dev/null &&
 191      git cat-file blob $blob_2 > /dev/null &&
 192      git cat-file blob $blob_3 > /dev/null'
 193
 194 test_done