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
   7if ! test_have_prereq SHA1
   8then
   9       skip_all='not using SHA-1 for objects'
  10       test_done
  11fi
  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.
  16LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
  17HI_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).
  23MISSING_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# $2 is the number of times to duplicate each object
  31create_pack () {
  32        pack_header "$((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
  41test_expect_success 'pack with no duplicates' '
  42        create_pack no-dups.pack 1 &&
  43        git index-pack --stdin <no-dups.pack
  44'
  45
  46test_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
  52test_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
  65test_expect_success 'lookup in duplicated pack' '
  66        git cat-file --batch-check <input >actual &&
  67        test_cmp expect actual
  68'
  69
  70test_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
  77test_done