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gitstergitster
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Merge branch 'ms/update-index-racy'
"git update-index --refresh" has been taught to deal better with racy timestamps (just like "git status" already does). * ms/update-index-racy: update-index: refresh should rewrite index in case of racy timestamps t7508: add tests capturing racy timestamp handling t7508: fix bogus mtime verification test-lib: introduce API for verifying file mtime
2 parents 1b4d9b4 + 2ede073 commit ee52b35

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6 files changed

+135
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lines changed

6 files changed

+135
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lines changed

‎builtin/update-index.c‎

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Original file line numberDiff line numberDiff line change
@@ -787,6 +787,17 @@ static int refresh(struct refresh_params *o, unsigned int flag)
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setup_work_tree();
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read_cache();
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*o->has_errors |= refresh_cache(o->flags | flag);
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if (has_racy_timestamp(&the_index)) {
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/*
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* Even if nothing else has changed, updating the file
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* increases the chance that racy timestamps become
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* non-racy, helping future run-time performance.
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* We do that even in case of "errors" returned by
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* refresh_cache() as these are no actual errors.
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* cmd_status() does the same.
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*/
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active_cache_changed |= SOMETHING_CHANGED;
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}
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return 0;
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}
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‎cache.h‎

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Original file line numberDiff line numberDiff line change
@@ -889,6 +889,7 @@ void *read_blob_data_from_index(struct index_state *, const char *, unsigned lon
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#define CE_MATCH_IGNORE_FSMONITOR 0X20
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int is_racy_timestamp(const struct index_state *istate,
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const struct cache_entry *ce);
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int has_racy_timestamp(struct index_state *istate);
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int ie_match_stat(struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
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int ie_modified(struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
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‎read-cache.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2775,7 +2775,7 @@ static int repo_verify_index(struct repository *repo)
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return verify_index_from(repo->index, repo->index_file);
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}
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static int has_racy_timestamp(struct index_state *istate)
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int has_racy_timestamp(struct index_state *istate)
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{
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int entries = istate->cache_nr;
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int i;

‎t/t2108-update-index-refresh-racy.sh‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,64 @@
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#!/bin/sh
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test_description='update-index refresh tests related to racy timestamps'
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TEST_PASSES_SANITIZE_LEAK=true
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. ./test-lib.sh
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reset_files () {
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echo content >file &&
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echo content >other &&
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test_set_magic_mtime file &&
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test_set_magic_mtime other
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}
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update_assert_changed () {
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test_set_magic_mtime .git/index &&
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test_might_fail git update-index "$1" &&
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! test_is_magic_mtime .git/index
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}
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test_expect_success 'setup' '
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reset_files &&
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# we are calling reset_files() a couple of times during tests;
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# test-tool chmtime does not change the ctime; to not weaken
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# or even break our tests, disable ctime-checks entirely
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git config core.trustctime false &&
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git add file other &&
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git commit -m "initial import"
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'
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test_expect_success '--refresh has no racy timestamps to fix' '
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reset_files &&
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# set the index time far enough to the future;
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# it must be at least 3 seconds for VFAT
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test_set_magic_mtime .git/index +60 &&
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git update-index --refresh &&
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test_is_magic_mtime .git/index +60
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'
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test_expect_success '--refresh should fix racy timestamp' '
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reset_files &&
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update_assert_changed --refresh
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'
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test_expect_success '--really-refresh should fix racy timestamp' '
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reset_files &&
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update_assert_changed --really-refresh
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'
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test_expect_success '--refresh should fix racy timestamp if other file needs update' '
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reset_files &&
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echo content2 >other &&
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test_set_magic_mtime other &&
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update_assert_changed --refresh
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'
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test_expect_success '--refresh should fix racy timestamp if racy file needs update' '
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reset_files &&
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echo content2 >file &&
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test_set_magic_mtime file &&
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update_assert_changed --refresh
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'
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test_done

‎t/t7508-status.sh‎

Lines changed: 25 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1647,13 +1647,33 @@ test_expect_success '"Initial commit" should not be noted in commit template' '
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'
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test_expect_success '--no-optional-locks prevents index update' '
1650-
test-tool chmtime =1234567890 .git/index &&
1650+
test_set_magic_mtime .git/index &&
16511651
git --no-optional-locks status &&
1652-
test-tool chmtime --get .git/index >out &&
1653-
grep ^1234567890 out &&
1652+
test_is_magic_mtime .git/index &&
16541653
git status &&
1655-
test-tool chmtime --get .git/index >out &&
1656-
! grep ^1234567890 out
1654+
! test_is_magic_mtime .git/index
1655+
'
1656+
1657+
test_expect_success 'racy timestamps will be fixed for clean worktree' '
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echo content >racy-dirty &&
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echo content >racy-racy &&
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git add racy* &&
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git commit -m "racy test files" &&
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# let status rewrite the index, if necessary; after that we expect
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# no more index writes unless caused by racy timestamps; note that
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# timestamps may already be racy now (depending on previous tests)
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git status &&
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test_set_magic_mtime .git/index &&
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git status &&
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! test_is_magic_mtime .git/index
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'
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test_expect_success 'racy timestamps will be fixed for dirty worktree' '
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echo content2 >racy-dirty &&
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git status &&
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test_set_magic_mtime .git/index &&
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git status &&
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! test_is_magic_mtime .git/index
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'
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test_done

‎t/test-lib-functions.sh‎

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Original file line numberDiff line numberDiff line change
@@ -1840,3 +1840,36 @@ test_region () {
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test_readlink () {
18411841
perl -le 'print readlink($_) for @ARGV' "$@"
18421842
}
1843+
1844+
# Set mtime to a fixed "magic" timestamp in mid February 2009, before we
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# run an operation that may or may not touch the file. If the file was
1846+
# touched, its timestamp will not accidentally have such an old timestamp,
1847+
# as long as your filesystem clock is reasonably correct. To verify the
1848+
# timestamp, follow up with test_is_magic_mtime.
1849+
#
1850+
# An optional increment to the magic timestamp may be specified as second
1851+
# argument.
1852+
test_set_magic_mtime () {
1853+
local inc=${2:-0} &&
1854+
local mtime=$((1234567890 + $inc)) &&
1855+
test-tool chmtime =$mtime "$1" &&
1856+
test_is_magic_mtime "$1" $inc
1857+
}
1858+
1859+
# Test whether the given file has the "magic" mtime set. This is meant to
1860+
# be used in combination with test_set_magic_mtime.
1861+
#
1862+
# An optional increment to the magic timestamp may be specified as second
1863+
# argument. Usually, this should be the same increment which was used for
1864+
# the associated test_set_magic_mtime.
1865+
test_is_magic_mtime () {
1866+
local inc=${2:-0} &&
1867+
local mtime=$((1234567890 + $inc)) &&
1868+
echo $mtime >.git/test-mtime-expect &&
1869+
test-tool chmtime --get "$1" >.git/test-mtime-actual &&
1870+
test_cmp .git/test-mtime-expect .git/test-mtime-actual
1871+
local ret=$?
1872+
rm -f .git/test-mtime-expect
1873+
rm -f .git/test-mtime-actual
1874+
return $ret
1875+
}

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