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diff --git a/t/t5303-pack-corruption-resilience.sh b/t/t5303-pack-corruption-resilience.sh
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+#!/bin/sh
+#
+# Copyright (c) 2008 Nicolas Pitre
+#
+
+test_description='resilience to pack corruptions with redundant objects'
+. ./test-lib.sh
+
+# 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.
+
+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
+}
+
+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 ${pack}.pack
+}
+
+do_repack() {
+ pack=`printf "$blob_1\n$blob_2\n$blob_3\n" |
+ git pack-objects $@ .git/objects/pack/pack` &&
+ pack=".git/objects/pack/pack-${pack}"
+}
+
+do_corrupt_object() {
+ ofs=`git show-index < ${pack}.idx | grep $1 | cut -f1 -d" "` &&
+ ofs=$(($ofs + $2)) &&
+ chmod +w ${pack}.pack &&
+ dd of=${pack}.pack count=1 bs=1 conv=notrunc seek=$ofs &&
+ test_must_fail git verify-pack ${pack}.pack
+}
+
+printf '\0' > zero
+
+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'
+
+test_expect_success \
+ 'create corruption in header of first object' \
+ 'do_corrupt_object $blob_1 0 < zero &&
+ 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'
+
+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'
+
+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'
+
+test_expect_success \
+ 'create corruption in data of first object' \
+ 'create_new_pack &&
+ git prune-packed &&
+ chmod +w ${pack}.pack &&
+ perl -i.bak -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'
+
+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'
+
+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'
+
+test_expect_success \
+ 'create corruption in header of first delta' \
+ 'create_new_pack &&
+ git prune-packed &&
+ do_corrupt_object $blob_2 0 < zero &&
+ 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'
+
+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'
+
+test_expect_success \
+ '... and then a repack "clears" the corruption' \
+ 'do_repack &&
+ git prune-packed &&
+ git verify-pack ${pack}.pack &&
+ git cat-file blob $blob_1 > /dev/null &&
+ git cat-file blob $blob_2 > /dev/null &&
+ git cat-file blob $blob_3 > /dev/null'
+
+test_expect_success \
+ 'create corruption in data of first delta' \
+ 'create_new_pack &&
+ git prune-packed &&
+ chmod +w ${pack}.pack &&
+ perl -i.bak -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'
+
+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'
+
+test_expect_success \
+ '... and then a repack "clears" the corruption' \
+ 'do_repack &&
+ git prune-packed &&
+ git verify-pack ${pack}.pack &&
+ git cat-file blob $blob_1 > /dev/null &&
+ git cat-file blob $blob_2 > /dev/null &&
+ git cat-file blob $blob_3 > /dev/null'
+
+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 < zero &&
+ 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'
+
+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'
+
+test_expect_success \
+ '... and then a repack "clears" the corruption' \
+ 'do_repack &&
+ git prune-packed &&
+ git verify-pack ${pack}.pack &&
+ git cat-file blob $blob_1 > /dev/null &&
+ git cat-file blob $blob_2 > /dev/null &&
+ git cat-file blob $blob_3 > /dev/null'
+
+test_expect_success \
+ 'corruption #0 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 < zero &&
+ 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'
+
+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'
+
+test_expect_success \
+ '... and then a repack "clears" the corruption' \
+ 'do_repack --delta-base-offset &&
+ git prune-packed &&
+ git verify-pack ${pack}.pack &&
+ git cat-file blob $blob_1 > /dev/null &&
+ git cat-file blob $blob_2 > /dev/null &&
+ git cat-file blob $blob_3 > /dev/null'
+
+test_expect_success \
+ 'corruption #1 in delta base reference of first delta (OBJ_OFS_DELTA)' \
+ 'create_new_pack --delta-base-offset &&
+ git prune-packed &&
+ printf "\001" | 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'
+
+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'
+
+test_expect_success \
+ '... and then a repack "clears" the corruption' \
+ 'do_repack --delta-base-offset &&
+ git prune-packed &&
+ git verify-pack ${pack}.pack &&
+ git cat-file blob $blob_1 > /dev/null &&
+ git cat-file blob $blob_2 > /dev/null &&
+ git cat-file blob $blob_3 > /dev/null'
+
+test_expect_success \
+ '... and a redundant pack allows for full recovery too' \
+ 'do_corrupt_object $blob_2 2 < zero &&
+ 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 &&
+ 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'
+
+test_done
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-13 13:11:04 +0000