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#!/bin/sh
test_description='handling of duplicate objects in incoming packfiles'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-pack.sh
if ! test_have_prereq SHA1
then
skip_all='not using SHA-1 for objects'
test_done
fi
# The sha1s we have in our pack. It's important that these have the same
# starting byte, so that they end up in the same fanout section of the index.
# That lets us make sure we are exercising the binary search with both sets.
LO_SHA1=e68fe8129b546b101aee9510c5328e7f21ca1d18
HI_SHA1=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
# And here's a "missing sha1" which will produce failed lookups. It must also
# be in the same fanout section, and should be between the two (so that during
# our binary search, we are sure to end up looking at one or the other of the
# duplicate runs).
MISSING_SHA1='e69d000000000000000000000000000000000000'
# git will never intentionally create packfiles with
# duplicate objects, so we have to construct them by hand.
#
# $1 is the name of the packfile to create
#
# $2 is the number of times to duplicate each object
create_pack () {
pack_header "$((2 * $2))" >"$1" &&
for i in $(test_seq 1 "$2"); do
pack_obj $LO_SHA1 &&
pack_obj $HI_SHA1
done >>"$1" &&
pack_trailer "$1"
}
# double-check that create_pack actually works
test_expect_success 'pack with no duplicates' '
create_pack no-dups.pack 1 &&
git index-pack --stdin <no-dups.pack
'
test_expect_success 'index-pack will allow duplicate objects by default' '
clear_packs &&
create_pack dups.pack 100 &&
git index-pack --stdin <dups.pack
'
test_expect_success 'create batch-check test vectors' '
cat >input <<-EOF &&
$LO_SHA1
$HI_SHA1
$MISSING_SHA1
EOF
cat >expect <<-EOF
$LO_SHA1 blob 2
$HI_SHA1 blob 0
$MISSING_SHA1 missing
EOF
'
test_expect_success 'lookup in duplicated pack' '
git cat-file --batch-check <input >actual &&
test_cmp expect actual
'
test_expect_success 'index-pack can reject packs with duplicates' '
clear_packs &&
create_pack dups.pack 2 &&
test_must_fail git index-pack --strict --stdin <dups.pack &&
test_expect_code 1 git cat-file -e $LO_SHA1
'
test_done
|
