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git/t/t1700-split-index.sh
Junio C Hamano 7a43ab6fb2 Merge branch 'sg/split-index-racefix' 
The codepath to support the experimental split-index mode had
remaining "racily clean" issues fixed.

* sg/split-index-racefix:
  split-index: BUG() when cache entry refers to non-existing shared entry
  split-index: smudge and add racily clean cache entries to split index
  split-index: don't compare cached data of entries already marked for split index
  split-index: count the number of deleted entries
  t1700-split-index: date back files to avoid racy situations
  split-index: add tests to demonstrate the racy split index problem
  t1700-split-index: document why FSMONITOR is disabled in this test script
2018-10-26 14:22:10 +09:00

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#!/bin/sh
test_description='split index mode tests'
. ./test-lib.sh
# We need total control of index splitting here
sane_unset GIT_TEST_SPLIT_INDEX
# Testing a hard coded SHA against an index with an extension
# that can vary from run to run is problematic so we disable
# those extensions.
sane_unset GIT_TEST_FSMONITOR
sane_unset GIT_TEST_INDEX_THREADS
# Create a file named as $1 with content read from stdin.
# Set the file's mtime to a few seconds in the past to avoid racy situations.
create_non_racy_file () {
cat >"$1" &&
test-tool chmtime =-5 "$1"
}
test_expect_success 'enable split index' '
git config splitIndex.maxPercentChange 100 &&
git update-index --split-index &&
test-tool dump-split-index .git/index >actual &&
indexversion=$(test-tool index-version <.git/index) &&
if test "$indexversion" = "4"
then
own=3527df833c6c100d3d1d921a9a782d62a8be4b58
base=746f7ab2ed44fb839efdfbffcf399d0b113fb4cb
else
own=5e9b60117ece18da410ddecc8b8d43766a0e4204
base=4370042739b31cd17a5c5cd6043a77c9a00df113
fi &&
cat >expect <<-EOF &&
own $own
base $base
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'add one file' '
create_non_racy_file one &&
git update-index --add one &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 $EMPTY_BLOB 0 one
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
base $base
100644 $EMPTY_BLOB 0 one
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'disable split index' '
git update-index --no-split-index &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 $EMPTY_BLOB 0 one
EOF
test_cmp ls-files.expect ls-files.actual &&
BASE=$(test-tool dump-split-index .git/index | sed -n "s/^own/base/p") &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
not a split index
EOF
test_cmp expect actual
'
test_expect_success 'enable split index again, "one" now belongs to base index"' '
git update-index --split-index &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 $EMPTY_BLOB 0 one
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'modify original file, base index untouched' '
echo modified | create_non_racy_file one &&
git update-index one &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 2e0996000b7e9019eabcad29391bf0f5c7702f0b 0 one
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
q_to_tab >expect <<-EOF &&
$BASE
100644 2e0996000b7e9019eabcad29391bf0f5c7702f0b 0Q
replacements: 0
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'add another file, which stays index' '
create_non_racy_file two &&
git update-index --add two &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 2e0996000b7e9019eabcad29391bf0f5c7702f0b 0 one
100644 $EMPTY_BLOB 0 two
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
q_to_tab >expect <<-EOF &&
$BASE
100644 2e0996000b7e9019eabcad29391bf0f5c7702f0b 0Q
100644 $EMPTY_BLOB 0 two
replacements: 0
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'remove file not in base index' '
git update-index --force-remove two &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 2e0996000b7e9019eabcad29391bf0f5c7702f0b 0 one
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
q_to_tab >expect <<-EOF &&
$BASE
100644 2e0996000b7e9019eabcad29391bf0f5c7702f0b 0Q
replacements: 0
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'remove file in base index' '
git update-index --force-remove one &&
git ls-files --stage >ls-files.actual &&
test_must_be_empty ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions: 0
EOF
test_cmp expect actual
'
test_expect_success 'add original file back' '
create_non_racy_file one &&
git update-index --add one &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 $EMPTY_BLOB 0 one
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
100644 $EMPTY_BLOB 0 one
replacements:
deletions: 0
EOF
test_cmp expect actual
'
test_expect_success 'add new file' '
create_non_racy_file two &&
git update-index --add two &&
git ls-files --stage >actual &&
cat >expect <<-EOF &&
100644 $EMPTY_BLOB 0 one
100644 $EMPTY_BLOB 0 two
EOF
test_cmp expect actual
'
test_expect_success 'unify index, two files remain' '
git update-index --no-split-index &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 $EMPTY_BLOB 0 one
100644 $EMPTY_BLOB 0 two
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
not a split index
EOF
test_cmp expect actual
'
test_expect_success 'rev-parse --shared-index-path' '
test_create_repo split-index &&
(
cd split-index &&
git update-index --split-index &&
echo .git/sharedindex* >expect &&
git rev-parse --shared-index-path >actual &&
test_cmp expect actual &&
mkdir subdirectory &&
cd subdirectory &&
echo ../.git/sharedindex* >expect &&
git rev-parse --shared-index-path >actual &&
test_cmp expect actual
)
'
test_expect_success 'set core.splitIndex config variable to true' '
git config core.splitIndex true &&
create_non_racy_file three &&
git update-index --add three &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 one
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 three
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 two
EOF
test_cmp ls-files.expect ls-files.actual &&
BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'set core.splitIndex config variable to false' '
git config core.splitIndex false &&
git update-index --force-remove three &&
git ls-files --stage >ls-files.actual &&
cat >ls-files.expect <<-EOF &&
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 one
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 two
EOF
test_cmp ls-files.expect ls-files.actual &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
not a split index
EOF
test_cmp expect actual
'
test_expect_success 'set core.splitIndex config variable back to true' '
git config core.splitIndex true &&
create_non_racy_file three &&
git update-index --add three &&
BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions:
EOF
test_cmp expect actual &&
create_non_racy_file four &&
git update-index --add four &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 four
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'check behavior with splitIndex.maxPercentChange unset' '
git config --unset splitIndex.maxPercentChange &&
create_non_racy_file five &&
git update-index --add five &&
BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions:
EOF
test_cmp expect actual &&
create_non_racy_file six &&
git update-index --add six &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
100644 e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 0 six
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'check splitIndex.maxPercentChange set to 0' '
git config splitIndex.maxPercentChange 0 &&
create_non_racy_file seven &&
git update-index --add seven &&
BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions:
EOF
test_cmp expect actual &&
create_non_racy_file eight &&
git update-index --add eight &&
BASE=$(test-tool dump-split-index .git/index | grep "^base") &&
test-tool dump-split-index .git/index | sed "/^own/d" >actual &&
cat >expect <<-EOF &&
$BASE
replacements:
deletions:
EOF
test_cmp expect actual
'
test_expect_success 'shared index files expire after 2 weeks by default' '
create_non_racy_file ten &&
git update-index --add ten &&
test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
just_under_2_weeks_ago=$((5-14*86400)) &&
test-tool chmtime =$just_under_2_weeks_ago .git/sharedindex.* &&
create_non_racy_file eleven &&
git update-index --add eleven &&
test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
just_over_2_weeks_ago=$((-1-14*86400)) &&
test-tool chmtime =$just_over_2_weeks_ago .git/sharedindex.* &&
create_non_racy_file twelve &&
git update-index --add twelve &&
test $(ls .git/sharedindex.* | wc -l) -le 2
'
test_expect_success 'check splitIndex.sharedIndexExpire set to 16 days' '
git config splitIndex.sharedIndexExpire "16.days.ago" &&
test-tool chmtime =$just_over_2_weeks_ago .git/sharedindex.* &&
create_non_racy_file thirteen &&
git update-index --add thirteen &&
test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
just_over_16_days_ago=$((-1-16*86400)) &&
test-tool chmtime =$just_over_16_days_ago .git/sharedindex.* &&
create_non_racy_file fourteen &&
git update-index --add fourteen &&
test $(ls .git/sharedindex.* | wc -l) -le 2
'
test_expect_success 'check splitIndex.sharedIndexExpire set to "never" and "now"' '
git config splitIndex.sharedIndexExpire never &&
just_10_years_ago=$((-365*10*86400)) &&
test-tool chmtime =$just_10_years_ago .git/sharedindex.* &&
create_non_racy_file fifteen &&
git update-index --add fifteen &&
test $(ls .git/sharedindex.* | wc -l) -gt 2 &&
git config splitIndex.sharedIndexExpire now &&
just_1_second_ago=-1 &&
test-tool chmtime =$just_1_second_ago .git/sharedindex.* &&
create_non_racy_file sixteen &&
git update-index --add sixteen &&
test $(ls .git/sharedindex.* | wc -l) -le 2
'
while read -r mode modebits
do
test_expect_success POSIXPERM "split index respects core.sharedrepository $mode" '
# Remove existing shared index files
git config core.splitIndex false &&
git update-index --force-remove one &&
rm -f .git/sharedindex.* &&
# Create one new shared index file
git config core.sharedrepository "$mode" &&
git config core.splitIndex true &&
create_non_racy_file one &&
git update-index --add one &&
echo "$modebits" >expect &&
test_modebits .git/index >actual &&
test_cmp expect actual &&
shared=$(ls .git/sharedindex.*) &&
case "$shared" in
*" "*)
# we have more than one???
false ;;
*)
test_modebits "$shared" >actual &&
test_cmp expect actual ;;
esac
'
done <<\EOF
0666 -rw-rw-rw-
0642 -rw-r---w-
EOF
test_expect_success POSIXPERM,SANITY 'graceful handling when splitting index is not allowed' '
test_create_repo ro &&
(
cd ro &&
test_commit initial &&
git update-index --split-index &&
test -f .git/sharedindex.*
) &&
cp ro/.git/index new-index &&
test_when_finished "chmod u+w ro/.git" &&
chmod u-w ro/.git &&
GIT_INDEX_FILE="$(pwd)/new-index" git -C ro update-index --split-index &&
chmod u+w ro/.git &&
rm ro/.git/sharedindex.* &&
GIT_INDEX_FILE=new-index git ls-files >actual &&
echo initial.t >expected &&
test_cmp expected actual
'
test_expect_success 'writing split index with null sha1 does not write cache tree' '
git config core.splitIndex true &&
git config splitIndex.maxPercentChange 0 &&
git commit -m "commit" &&
{
git ls-tree HEAD &&
printf "160000 commit $ZERO_OID\\tbroken\\n"
} >broken-tree &&
echo "add broken entry" >msg &&
tree=$(git mktree <broken-tree) &&
test_tick &&
commit=$(git commit-tree $tree -p HEAD <msg) &&
git update-ref HEAD "$commit" &&
GIT_ALLOW_NULL_SHA1=1 git reset --hard &&
test_might_fail test-tool dump-cache-tree >cache-tree.out &&
test_line_count = 0 cache-tree.out
'
test_done
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