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 if ! test_have_prereq SHA1
   8 then
   9        skip_all='not using SHA-1 for objects'
  10        test_done
  11 fi
  12
  13 # The sha1s we have in our pack. It's important that these have the same
  14 # starting byte, so that they end up in the same fanout section of the index.
  15 # That lets us make sure we are exercising the binary search with both sets.
  16 LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
  17 HI_SHA1=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
  18
  19 # And here's a "missing sha1" which will produce failed lookups. It must also
  20 # be in the same fanout section, and should be between the two (so that during
  21 # our binary search, we are sure to end up looking at one or the other of the
  22 # duplicate runs).
  23 MISSING_SHA1='e69d000000000000000000000000000000000000'
  24
  25 # git will never intentionally create packfiles with
  26 # duplicate objects, so we have to construct them by hand.
  27 #
  28 # $1 is the name of the packfile to create
  29 #
  30 # $2 is the number of times to duplicate each object
  31 create_pack () {
  32         pack_header "$((2 * $2))" >"$1" &&
  33         for i in $(test_seq 1 "$2"); do
  34                 pack_obj $LO_SHA1 &&
  35                 pack_obj $HI_SHA1
  36         done >>"$1" &&
  37         pack_trailer "$1"
  38 }
  39
  40 # double-check that create_pack actually works
  41 test_expect_success 'pack with no duplicates' '
  42         create_pack no-dups.pack 1 &&
  43         git index-pack --stdin <no-dups.pack
  44 '
  45
  46 test_expect_success 'index-pack will allow duplicate objects by default' '
  47         clear_packs &&
  48         create_pack dups.pack 100 &&
  49         git index-pack --stdin <dups.pack
  50 '
  51
  52 test_expect_success 'create batch-check test vectors' '
  53         cat >input <<-EOF &&
  54         $LO_SHA1
  55         $HI_SHA1
  56         $MISSING_SHA1
  57         EOF
  58         cat >expect <<-EOF
  59         $LO_SHA1 blob 2
  60         $HI_SHA1 blob 0
  61         $MISSING_SHA1 missing
  62         EOF
  63 '
  64
  65 test_expect_success 'lookup in duplicated pack' '
  66         git cat-file --batch-check <input >actual &&
  67         test_cmp expect actual
  68 '
  69
  70 test_expect_success 'index-pack can reject packs with duplicates' '
  71         clear_packs &&
  72         create_pack dups.pack 2 &&
  73         test_must_fail git index-pack --strict --stdin <dups.pack &&
  74         test_expect_code 1 git cat-file -e $LO_SHA1
  75 '
  76
  77 test_done