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1 #!/bin/sh
2
3 # This test can give false success if your machine is sufficiently
4 # slow or all trials happened to happen on second boundaries.
5
6 test_description='racy split index'
7
8 . ./test-lib.sh
9
10 test_expect_success 'setup' '
11 # Only split the index when the test explicitly says so.
12 sane_unset GIT_TEST_SPLIT_INDEX &&
13 git config splitIndex.maxPercentChange 100 &&
14
15 echo "cached content" >racy-file &&
16 git add racy-file &&
17 git commit -m initial &&
18
19 echo something >other-file &&
20 # No raciness with this file.
21 test-tool chmtime =-20 other-file &&
22
23 echo "+cached content" >expect
24 '
25
26 check_cached_diff () {
27 git diff-index --patch --cached $EMPTY_TREE racy-file >diff &&
28 tail -1 diff >actual &&
29 test_cmp expect actual
30 }
31
32 trials="0 1 2 3 4"
33 for trial in $trials
34 do
35 test_expect_success "split the index while adding a racily clean file #$trial" '
36 rm -f .git/index .git/sharedindex.* &&
37
38 # The next three commands must be run within the same
39 # second (so both writes to racy-file result in the same
40 # mtime) to create the interesting racy situation.
41 echo "cached content" >racy-file &&
42
43 # Update and split the index. The cache entry of
44 # racy-file will be stored only in the shared index.
45 git update-index --split-index --add racy-file &&
46
47 # File size must stay the same.
48 echo "dirty worktree" >racy-file &&
49
50 # Subsequent git commands should notice that racy-file
51 # and the split index have the same mtime, and check
52 # the content of the file to see if it is actually
53 # clean.
54 check_cached_diff
55 '
56 done
57
58 for trial in $trials
59 do
60 test_expect_success "add a racily clean file to an already split index #$trial" '
61 rm -f .git/index .git/sharedindex.* &&
62
63 git update-index --split-index &&
64
65 # The next three commands must be run within the same
66 # second.
67 echo "cached content" >racy-file &&
68
69 # Update the split index. The cache entry of racy-file
70 # will be stored only in the split index.
71 git update-index --add racy-file &&
72
73 # File size must stay the same.
74 echo "dirty worktree" >racy-file &&
75
76 # Subsequent git commands should notice that racy-file
77 # and the split index have the same mtime, and check
78 # the content of the file to see if it is actually
79 # clean.
80 check_cached_diff
81 '
82 done
83
84 for trial in $trials
85 do
86 test_expect_success "split the index when the index contains a racily clean cache entry #$trial" '
87 rm -f .git/index .git/sharedindex.* &&
88
89 # The next three commands must be run within the same
90 # second.
91 echo "cached content" >racy-file &&
92
93 git update-index --add racy-file &&
94
95 # File size must stay the same.
96 echo "dirty worktree" >racy-file &&
97
98 # Now wait a bit to ensure that the split index written
99 # below will get a more recent mtime than racy-file.
100 sleep 1 &&
101
102 # Update and split the index when the index contains
103 # the racily clean cache entry of racy-file.
104 # A corresponding replacement cache entry with smudged
105 # stat data should be added to the new split index.
106 git update-index --split-index --add other-file &&
107
108 # Subsequent git commands should notice the smudged
109 # stat data in the replacement cache entry and that it
110 # doesnt match with the file the worktree.
111 check_cached_diff
112 '
113 done
114
115 for trial in $trials
116 do
117 test_expect_success "update the split index when it contains a new racily clean cache entry #$trial" '
118 rm -f .git/index .git/sharedindex.* &&
119
120 git update-index --split-index &&
121
122 # The next three commands must be run within the same
123 # second.
124 echo "cached content" >racy-file &&
125
126 # Update the split index. The cache entry of racy-file
127 # will be stored only in the split index.
128 git update-index --add racy-file &&
129
130 # File size must stay the same.
131 echo "dirty worktree" >racy-file &&
132
133 # Now wait a bit to ensure that the split index written
134 # below will get a more recent mtime than racy-file.
135 sleep 1 &&
136
137 # Update the split index when the racily clean cache
138 # entry of racy-file is only stored in the split index.
139 # An updated cache entry with smudged stat data should
140 # be added to the new split index.
141 git update-index --add other-file &&
142
143 # Subsequent git commands should notice the smudged
144 # stat data.
145 check_cached_diff
146 '
147 done
148
149 for trial in $trials
150 do
151 test_expect_success "update the split index when a racily clean cache entry is stored only in the shared index #$trial" '
152 rm -f .git/index .git/sharedindex.* &&
153
154 # The next three commands must be run within the same
155 # second.
156 echo "cached content" >racy-file &&
157
158 # Update and split the index. The cache entry of
159 # racy-file will be stored only in the shared index.
160 git update-index --split-index --add racy-file &&
161
162 # File size must stay the same.
163 echo "dirty worktree" >racy-file &&
164
165 # Now wait a bit to ensure that the split index written
166 # below will get a more recent mtime than racy-file.
167 sleep 1 &&
168
169 # Update the split index when the racily clean cache
170 # entry of racy-file is only stored in the shared index.
171 # A corresponding replacement cache entry with smudged
172 # stat data should be added to the new split index.
173 git update-index --add other-file &&
174
175 # Subsequent git commands should notice the smudged
176 # stat data.
177 check_cached_diff
178 '
179 done
180
181 for trial in $trials
182 do
183 test_expect_success "update the split index after unpack trees() copied a racily clean cache entry from the shared index #$trial" '
184 rm -f .git/index .git/sharedindex.* &&
185
186 # The next three commands must be run within the same
187 # second.
188 echo "cached content" >racy-file &&
189
190 # Update and split the index. The cache entry of
191 # racy-file will be stored only in the shared index.
192 git update-index --split-index --add racy-file &&
193
194 # File size must stay the same.
195 echo "dirty worktree" >racy-file &&
196
197 # Now wait a bit to ensure that the split index written
198 # below will get a more recent mtime than racy-file.
199 sleep 1 &&
200
201 # Update the split index after unpack_trees() copied the
202 # racily clean cache entry of racy-file from the shared
203 # index. A corresponding replacement cache entry
204 # with smudged stat data should be added to the new
205 # split index.
206 git read-tree -m HEAD &&
207
208 # Subsequent git commands should notice the smudged
209 # stat data.
210 check_cached_diff
211 '
212 done
213
214 test_done