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 6test_description='racy split index' 7 8. ./test-lib.sh 9 10test_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 26check_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 32trials="0 1 2 3 4" 33for trial in $trials 34do 35 test_expect_success "split the index while adding a racily clean file #$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 ' 56done 57 58for trial in $trials 59do 60 test_expect_success "add a racily clean file to an already split index #$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 ' 82done 83 84for trial in $trials 85do 86 test_expect_success "split the index when the index contains a racily clean cache entry #$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 ' 113done 114 115for trial in $trials 116do 117 test_expect_success "update the split index when it contains a new racily clean cache entry #$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 ' 147done 148 149for trial in $trials 150do 151 test_expect_success "update the split index when a racily clean cache entry is stored only in the shared index #$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 ' 179done 180 181for trial in $trials 182do 183 test_expect_success "update the split index after unpack trees() copied a racily clean cache entry from the shared index #$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 ' 212done 213 214test_done 215