t/t5308-pack-detect-duplicates.sh

   1 #!/bin/sh
   2
   3 test_description='handling of duplicate objects in incoming packfiles'
   4 . ./test-lib.sh
   5 . "$TEST_DIRECTORY"/lib-pack.sh
   6
   7 # The sha1s we have in our pack. It's important that these have the same
   8 # starting byte, so that they end up in the same fanout section of the index.
   9 # That lets us make sure we are exercising the binary search with both sets.
  10 LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
  11 HI_SHA1=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
  12
  13 # And here's a "missing sha1" which will produce failed lookups. It must also
  14 # be in the same fanout section, and should be between the two (so that during
  15 # our binary search, we are sure to end up looking at one or the other of the
  16 # duplicate runs).
  17 MISSING_SHA1='e69d000000000000000000000000000000000000'
  18
  19 # git will never intentionally create packfiles with
  20 # duplicate objects, so we have to construct them by hand.
  21 #
  22 # $1 is the name of the packfile to create
  23 #
  24 # $2 is the number of times to duplicate each object
  25 create_pack () {
  26         pack_header "$((2 * $2))" >"$1" &&
  27         for i in $(test_seq 1 "$2"); do
  28                 pack_obj $LO_SHA1 &&
  29                 pack_obj $HI_SHA1
  30         done >>"$1" &&
  31         pack_trailer "$1"
  32 }
  33
  34 # double-check that create_pack actually works
  35 test_expect_success 'pack with no duplicates' '
  36         create_pack no-dups.pack 1 &&
  37         git index-pack --stdin <no-dups.pack
  38 '
  39
  40 test_expect_success 'index-pack will allow duplicate objects by default' '
  41         clear_packs &&
  42         create_pack dups.pack 100 &&
  43         git index-pack --stdin <dups.pack
  44 '
  45
  46 test_expect_success 'create batch-check test vectors' '
  47         cat >input <<-EOF &&
  48         $LO_SHA1
  49         $HI_SHA1
  50         $MISSING_SHA1
  51         EOF
  52         cat >expect <<-EOF
  53         $LO_SHA1 blob 2
  54         $HI_SHA1 blob 0
  55         $MISSING_SHA1 missing
  56         EOF
  57 '
  58
  59 test_expect_success 'lookup in duplicated pack (binary search)' '
  60         git cat-file --batch-check <input >actual &&
  61         test_cmp expect actual
  62 '
  63
  64 test_expect_success 'lookup in duplicated pack (GIT_USE_LOOKUP)' '
  65         (
  66                 GIT_USE_LOOKUP=1 &&
  67                 export GIT_USE_LOOKUP &&
  68                 git cat-file --batch-check <input >actual
  69         ) &&
  70         test_cmp expect actual
  71 '
  72
  73 test_expect_success 'index-pack can reject packs with duplicates' '
  74         clear_packs &&
  75         create_pack dups.pack 2 &&
  76         test_must_fail git index-pack --strict --stdin <dups.pack &&
  77         test_expect_code 1 git cat-file -e $LO_SHA1
  78 '
  79
  80 test_done