Andrew's git - gitweb.git/blob - t/t5308-pack-detect-duplicates.sh

   1#!/bin/sh
   2
   3test_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.
  10LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
  11HI_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).
  17MISSING_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# $2 is the number of times to duplicate each object
  25create_pack () {
  26        pack_header "$((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
  35test_expect_success 'pack with no duplicates' '
  36        create_pack no-dups.pack 1 &&
  37        git index-pack --stdin <no-dups.pack
  38'
  39
  40test_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
  46test_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
  59test_expect_success 'lookup in duplicated pack (binary search)' '
  60        git cat-file --batch-check <input >actual &&
  61        test_cmp expect actual
  62'
  63
  64test_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
  73test_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
  80test_done