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test case for pack resilience against corruptions
Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Nicolas Pitre
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Junio C Hamano
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Jun 24, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,194 @@ | ||
| #!/bin/sh | ||
| # | ||
| # Copyright (c) 2008 Nicolas Pitre | ||
| # | ||
|
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| test_description='resilience to pack corruptions with redundant objects' | ||
| . ./test-lib.sh | ||
|
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| # Note: the test objects are created with knowledge of their pack encoding | ||
| # to ensure good code path coverage, and to facilitate direct alteration | ||
| # later on. The assumed characteristics are: | ||
| # | ||
| # 1) blob_2 is a delta with blob_1 for base and blob_3 is a delta with blob2 | ||
| # for base, such that blob_3 delta depth is 2; | ||
| # | ||
| # 2) the bulk of object data is uncompressible so the text part remains | ||
| # visible; | ||
| # | ||
| # 3) object header is always 2 bytes. | ||
|
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||
| create_test_files() { | ||
| test-genrandom "foo" 2000 > file_1 && | ||
| test-genrandom "foo" 1800 > file_2 && | ||
| test-genrandom "foo" 1800 > file_3 && | ||
| echo " base " >> file_1 && | ||
| echo " delta1 " >> file_2 && | ||
| echo " delta delta2 " >> file_3 && | ||
| test-genrandom "bar" 150 >> file_2 && | ||
| test-genrandom "baz" 100 >> file_3 | ||
| } | ||
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| create_new_pack() { | ||
| rm -rf .git && | ||
| git init && | ||
| blob_1=`git hash-object -t blob -w file_1` && | ||
| blob_2=`git hash-object -t blob -w file_2` && | ||
| blob_3=`git hash-object -t blob -w file_3` && | ||
| pack=`printf "$blob_1\n$blob_2\n$blob_3\n" | | ||
| git pack-objects $@ .git/objects/pack/pack` && | ||
| pack=".git/objects/pack/pack-${pack}" && | ||
| git verify-pack -v ${pack}.pack | ||
| } | ||
|
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||
| do_corrupt_object() { | ||
| ofs=`git show-index < ${pack}.idx | grep $1 | cut -f1 -d" "` && | ||
| ofs=$(($ofs + $2)) && | ||
| chmod +w ${pack}.pack && | ||
| dd if=/dev/zero of=${pack}.pack count=1 bs=1 conv=notrunc seek=$ofs && | ||
| test_must_fail git verify-pack ${pack}.pack | ||
| } | ||
|
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||
| test_expect_success \ | ||
| 'initial setup validation' \ | ||
| 'create_test_files && | ||
| create_new_pack && | ||
| git prune-packed && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| 'create corruption in header of first object' \ | ||
| 'do_corrupt_object $blob_1 0 && | ||
| test_must_fail git cat-file blob $blob_1 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... but having a loose copy allows for full recovery' \ | ||
| 'mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_1 && | ||
| mv tmp ${pack}.idx && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... and loose copy of first delta allows for partial recovery' \ | ||
| 'git prune-packed && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_2 && | ||
| mv tmp ${pack}.idx && | ||
| test_must_fail git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| 'create corruption in data of first object' \ | ||
| 'create_new_pack && | ||
| git prune-packed && | ||
| chmod +w ${pack}.pack && | ||
| perl -i -pe "s/ base /abcdef/" ${pack}.pack && | ||
| test_must_fail git cat-file blob $blob_1 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... but having a loose copy allows for full recovery' \ | ||
| 'mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_1 && | ||
| mv tmp ${pack}.idx && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... and loose copy of second object allows for partial recovery' \ | ||
| 'git prune-packed && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_2 && | ||
| mv tmp ${pack}.idx && | ||
| test_must_fail git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| 'create corruption in header of first delta' \ | ||
| 'create_new_pack && | ||
| git prune-packed && | ||
| do_corrupt_object $blob_2 0 && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... but having a loose copy allows for full recovery' \ | ||
| 'mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_2 && | ||
| mv tmp ${pack}.idx && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| 'create corruption in data of first delta' \ | ||
| 'create_new_pack && | ||
| git prune-packed && | ||
| chmod +w ${pack}.pack && | ||
| perl -i -pe "s/ delta1 /abcdefgh/" ${pack}.pack && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... but having a loose copy allows for full recovery' \ | ||
| 'mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_2 && | ||
| mv tmp ${pack}.idx && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| 'corruption in delta base reference of first delta (OBJ_REF_DELTA)' \ | ||
| 'create_new_pack && | ||
| git prune-packed && | ||
| do_corrupt_object $blob_2 2 && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_3 > /dev/null' | ||
|
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||
| test_expect_success \ | ||
| '... but having a loose copy allows for full recovery' \ | ||
| 'mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_2 && | ||
| mv tmp ${pack}.idx && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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| test_expect_success \ | ||
| 'corruption in delta base reference of first delta (OBJ_OFS_DELTA)' \ | ||
| 'create_new_pack --delta-base-offset && | ||
| git prune-packed && | ||
| do_corrupt_object $blob_2 2 && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_2 > /dev/null && | ||
| test_must_fail git cat-file blob $blob_3 > /dev/null' | ||
|
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| test_expect_success \ | ||
| '... and a redundant pack allows for full recovery too' \ | ||
| 'mv ${pack}.idx tmp && | ||
| git hash-object -t blob -w file_1 && | ||
| git hash-object -t blob -w file_2 && | ||
| printf "$blob_1\n$blob_2\n" | git pack-objects .git/objects/pack/pack && | ||
| git prune-packed && | ||
| mv tmp ${pack}.idx && | ||
| git cat-file blob $blob_1 > /dev/null && | ||
| git cat-file blob $blob_2 > /dev/null && | ||
| git cat-file blob $blob_3 > /dev/null' | ||
|
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| test_done |