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Nicolas Pitregitster
Nicolas Pitre
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test case for pack resilience against corruptions
Signed-off-by: Nicolas Pitre <[email protected]> Signed-off-by: Junio C Hamano <[email protected]>
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‎t/t5303-pack-corruption-resilience.sh

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#!/bin/sh
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#
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# Copyright (c) 2008 Nicolas Pitre
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#
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test_description='resilience to pack corruptions with redundant objects'
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. ./test-lib.sh
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# Note: the test objects are created with knowledge of their pack encoding
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# to ensure good code path coverage, and to facilitate direct alteration
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# later on. The assumed characteristics are:
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#
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# 1) blob_2 is a delta with blob_1 for base and blob_3 is a delta with blob2
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# for base, such that blob_3 delta depth is 2;
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#
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# 2) the bulk of object data is uncompressible so the text part remains
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# visible;
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#
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# 3) object header is always 2 bytes.
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create_test_files() {
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test-genrandom "foo" 2000 > file_1 &&
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test-genrandom "foo" 1800 > file_2 &&
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test-genrandom "foo" 1800 > file_3 &&
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echo " base " >> file_1 &&
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echo " delta1 " >> file_2 &&
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echo " delta delta2 " >> file_3 &&
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test-genrandom "bar" 150 >> file_2 &&
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test-genrandom "baz" 100 >> file_3
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}
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create_new_pack() {
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rm -rf .git &&
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git init &&
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blob_1=`git hash-object -t blob -w file_1` &&
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blob_2=`git hash-object -t blob -w file_2` &&
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blob_3=`git hash-object -t blob -w file_3` &&
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pack=`printf "$blob_1\n$blob_2\n$blob_3\n" |
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git pack-objects $@ .git/objects/pack/pack` &&
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pack=".git/objects/pack/pack-${pack}" &&
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git verify-pack -v ${pack}.pack
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}
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do_corrupt_object() {
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ofs=`git show-index < ${pack}.idx | grep $1 | cut -f1 -d" "` &&
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ofs=$(($ofs + $2)) &&
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chmod +w ${pack}.pack &&
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dd if=/dev/zero of=${pack}.pack count=1 bs=1 conv=notrunc seek=$ofs &&
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test_must_fail git verify-pack ${pack}.pack
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}
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test_expect_success \
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'initial setup validation' \
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'create_test_files &&
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create_new_pack &&
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git prune-packed &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in header of first object' \
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'do_corrupt_object $blob_1 0 &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_1 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and loose copy of first delta allows for partial recovery' \
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'git prune-packed &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in data of first object' \
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'create_new_pack &&
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git prune-packed &&
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chmod +w ${pack}.pack &&
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perl -i -pe "s/ base /abcdef/" ${pack}.pack &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_1 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and loose copy of second object allows for partial recovery' \
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'git prune-packed &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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test_must_fail git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in header of first delta' \
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'create_new_pack &&
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git prune-packed &&
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do_corrupt_object $blob_2 0 &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'create corruption in data of first delta' \
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'create_new_pack &&
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git prune-packed &&
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chmod +w ${pack}.pack &&
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perl -i -pe "s/ delta1 /abcdefgh/" ${pack}.pack &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corruption in delta base reference of first delta (OBJ_REF_DELTA)' \
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'create_new_pack &&
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git prune-packed &&
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do_corrupt_object $blob_2 2 &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... but having a loose copy allows for full recovery' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_2 &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'corruption in delta base reference of first delta (OBJ_OFS_DELTA)' \
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'create_new_pack --delta-base-offset &&
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git prune-packed &&
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do_corrupt_object $blob_2 2 &&
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git cat-file blob $blob_1 > /dev/null &&
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test_must_fail git cat-file blob $blob_2 > /dev/null &&
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test_must_fail git cat-file blob $blob_3 > /dev/null'
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test_expect_success \
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'... and a redundant pack allows for full recovery too' \
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'mv ${pack}.idx tmp &&
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git hash-object -t blob -w file_1 &&
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git hash-object -t blob -w file_2 &&
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printf "$blob_1\n$blob_2\n" | git pack-objects .git/objects/pack/pack &&
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git prune-packed &&
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mv tmp ${pack}.idx &&
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git cat-file blob $blob_1 > /dev/null &&
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git cat-file blob $blob_2 > /dev/null &&
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git cat-file blob $blob_3 > /dev/null'
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test_done

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