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+#!/bin/sh
+
+# This test can give false success if your machine is sufficiently
+# slow or all trials happened to happen on second boundaries.
+
+test_description='racy split index'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ # Only split the index when the test explicitly says so.
+ sane_unset GIT_TEST_SPLIT_INDEX &&
+ git config splitIndex.maxPercentChange 100 &&
+
+ echo "cached content" >racy-file &&
+ git add racy-file &&
+ git commit -m initial &&
+
+ echo something >other-file &&
+ # No raciness with this file.
+ test-tool chmtime =-20 other-file &&
+
+ echo "+cached content" >expect
+'
+
+check_cached_diff () {
+ git diff-index --patch --cached $EMPTY_TREE racy-file >diff &&
+ tail -1 diff >actual &&
+ test_cmp expect actual
+}
+
+trials="0 1 2 3 4"
+for trial in $trials
+do
+ test_expect_success "split the index while adding a racily clean file #$trial" '
+ rm -f .git/index .git/sharedindex.* &&
+
+ # The next three commands must be run within the same
+ # second (so both writes to racy-file result in the same
+ # mtime) to create the interesting racy situation.
+ echo "cached content" >racy-file &&
+
+ # Update and split the index. The cache entry of
+ # racy-file will be stored only in the shared index.
+ git update-index --split-index --add racy-file &&
+
+ # File size must stay the same.
+ echo "dirty worktree" >racy-file &&
+
+ # Subsequent git commands should notice that racy-file
+ # and the split index have the same mtime, and check
+ # the content of the file to see if it is actually
+ # clean.
+ check_cached_diff
+ '
+done
+
+for trial in $trials
+do
+ test_expect_success "add a racily clean file to an already split index #$trial" '
+ rm -f .git/index .git/sharedindex.* &&
+
+ git update-index --split-index &&
+
+ # The next three commands must be run within the same
+ # second.
+ echo "cached content" >racy-file &&
+
+ # Update the split index. The cache entry of racy-file
+ # will be stored only in the split index.
+ git update-index --add racy-file &&
+
+ # File size must stay the same.
+ echo "dirty worktree" >racy-file &&
+
+ # Subsequent git commands should notice that racy-file
+ # and the split index have the same mtime, and check
+ # the content of the file to see if it is actually
+ # clean.
+ check_cached_diff
+ '
+done
+
+for trial in $trials
+do
+ test_expect_success "split the index when the index contains a racily clean cache entry #$trial" '
+ rm -f .git/index .git/sharedindex.* &&
+
+ # The next three commands must be run within the same
+ # second.
+ echo "cached content" >racy-file &&
+
+ git update-index --add racy-file &&
+
+ # File size must stay the same.
+ echo "dirty worktree" >racy-file &&
+
+ # Now wait a bit to ensure that the split index written
+ # below will get a more recent mtime than racy-file.
+ sleep 1 &&
+
+ # Update and split the index when the index contains
+ # the racily clean cache entry of racy-file.
+ # A corresponding replacement cache entry with smudged
+ # stat data should be added to the new split index.
+ git update-index --split-index --add other-file &&
+
+ # Subsequent git commands should notice the smudged
+ # stat data in the replacement cache entry and that it
+ # doesnt match with the file the worktree.
+ check_cached_diff
+ '
+done
+
+for trial in $trials
+do
+ test_expect_success "update the split index when it contains a new racily clean cache entry #$trial" '
+ rm -f .git/index .git/sharedindex.* &&
+
+ git update-index --split-index &&
+
+ # The next three commands must be run within the same
+ # second.
+ echo "cached content" >racy-file &&
+
+ # Update the split index. The cache entry of racy-file
+ # will be stored only in the split index.
+ git update-index --add racy-file &&
+
+ # File size must stay the same.
+ echo "dirty worktree" >racy-file &&
+
+ # Now wait a bit to ensure that the split index written
+ # below will get a more recent mtime than racy-file.
+ sleep 1 &&
+
+ # Update the split index when the racily clean cache
+ # entry of racy-file is only stored in the split index.
+ # An updated cache entry with smudged stat data should
+ # be added to the new split index.
+ git update-index --add other-file &&
+
+ # Subsequent git commands should notice the smudged
+ # stat data.
+ check_cached_diff
+ '
+done
+
+for trial in $trials
+do
+ test_expect_success "update the split index when a racily clean cache entry is stored only in the shared index #$trial" '
+ rm -f .git/index .git/sharedindex.* &&
+
+ # The next three commands must be run within the same
+ # second.
+ echo "cached content" >racy-file &&
+
+ # Update and split the index. The cache entry of
+ # racy-file will be stored only in the shared index.
+ git update-index --split-index --add racy-file &&
+
+ # File size must stay the same.
+ echo "dirty worktree" >racy-file &&
+
+ # Now wait a bit to ensure that the split index written
+ # below will get a more recent mtime than racy-file.
+ sleep 1 &&
+
+ # Update the split index when the racily clean cache
+ # entry of racy-file is only stored in the shared index.
+ # A corresponding replacement cache entry with smudged
+ # stat data should be added to the new split index.
+ git update-index --add other-file &&
+
+ # Subsequent git commands should notice the smudged
+ # stat data.
+ check_cached_diff
+ '
+done
+
+for trial in $trials
+do
+ test_expect_success "update the split index after unpack trees() copied a racily clean cache entry from the shared index #$trial" '
+ rm -f .git/index .git/sharedindex.* &&
+
+ # The next three commands must be run within the same
+ # second.
+ echo "cached content" >racy-file &&
+
+ # Update and split the index. The cache entry of
+ # racy-file will be stored only in the shared index.
+ git update-index --split-index --add racy-file &&
+
+ # File size must stay the same.
+ echo "dirty worktree" >racy-file &&
+
+ # Now wait a bit to ensure that the split index written
+ # below will get a more recent mtime than racy-file.
+ sleep 1 &&
+
+ # Update the split index after unpack_trees() copied the
+ # racily clean cache entry of racy-file from the shared
+ # index. A corresponding replacement cache entry
+ # with smudged stat data should be added to the new
+ # split index.
+ git read-tree -m HEAD &&
+
+ # Subsequent git commands should notice the smudged
+ # stat data.
+ check_cached_diff
+ '
+done
+
+test_done