/
t5303-pack-corruption-resilience.sh
executable file
·278 lines (247 loc) · 9.57 KB
/
t5303-pack-corruption-resilience.sh
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
#!/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