From: "Marc Strapetz via GitGitGadget" <gitgitgadget@gmail.com>
To: git@vger.kernel.org
Cc: Marc Strapetz <marc.strapetz@syntevo.com>
Subject: [PATCH v3 0/4] update-index: refresh should rewrite index in case of racy timestamps
Date: Thu, 06 Jan 2022 22:34:54 +0000 [thread overview]
Message-ID: <pull.1105.v3.git.1641508499.gitgitgadget@gmail.com> (raw)
In-Reply-To: <pull.1105.v2.git.1641388523.gitgitgadget@gmail.com>
This patch makes update-index --refresh write the index if it contains racy
timestamps, as discussed at [1].
Changes since v2:
* new patch: test-lib: introduce API for verifying file mtime
* new patch: t7508: fix bogus mtime verification for test
"--no-optional-locks prevents index update"
* change new tests in t2108 and t7508 to use new test-lib mtime API
* fix "--refresh has no racy timestamps to fix" to use +60s mtime to be
save on VFAT
Changes since v1:
* main commit message now uses 'git update-index' and the paragraph was
dropped
* t/t7508-status.sh: two tests added which capture status racy handling
* builtin/update-index.c: comment improved
* t/t2108-update-index-refresh-racy.sh: major overhaul
* one test case added
* mtime-manipulations simplified and aligned to t7508
* code style fixes, as discussed
[1]
https://lore.kernel.org/git/d3dd805c-7c1d-30a9-6574-a7bfcb7fc013@syntevo.com/
Marc Strapetz (4):
test-lib: introduce API for verifying file mtime
t7508: fix bogus mtime verification
t7508: add tests capturing racy timestamp handling
update-index: refresh should rewrite index in case of racy timestamps
builtin/update-index.c | 11 +++++
cache.h | 1 +
read-cache.c | 2 +-
t/t2108-update-index-refresh-racy.sh | 64 ++++++++++++++++++++++++++++
t/t7508-status.sh | 30 ++++++++++---
t/test-lib-functions.sh | 28 ++++++++++++
6 files changed, 130 insertions(+), 6 deletions(-)
create mode 100755 t/t2108-update-index-refresh-racy.sh
base-commit: dcc0cd074f0c639a0df20461a301af6d45bd582e
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1105%2Fmstrap%2Ffeature%2Fupdate-index-refresh-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1105/mstrap/feature/update-index-refresh-v3
Pull-Request: https://github.com/gitgitgadget/git/pull/1105
Range-diff vs v2:
-: ----------- > 1: e6301e9d770 test-lib: introduce API for verifying file mtime
-: ----------- > 2: d15a23cc804 t7508: fix bogus mtime verification
1: 7d58f806111 ! 3: 3567ef91e7a t7508: add tests capturing racy timestamp handling
@@ Commit message
## t/t7508-status.sh ##
@@ t/t7508-status.sh: test_expect_success '--no-optional-locks prevents index update' '
- ! grep ^1234567890 out
+ ! test_is_magic_mtime .git/index
'
+test_expect_success 'racy timestamps will be fixed for clean worktree' '
@@ t/t7508-status.sh: test_expect_success '--no-optional-locks prevents index updat
+ # no more index writes unless caused by racy timestamps; note that
+ # timestamps may already be racy now (depending on previous tests)
+ git status &&
-+ test-tool chmtime =1234567890 .git/index &&
-+ test-tool chmtime --get .git/index >out &&
-+ grep ^1234567890 out &&
++ test_set_magic_mtime .git/index &&
+ git status &&
-+ test-tool chmtime --get .git/index >out &&
-+ ! grep ^1234567890 out
++ ! test_is_magic_mtime .git/index
+'
+
+test_expect_success 'racy timestamps will be fixed for dirty worktree' '
+ echo content2 >racy-dirty &&
+ git status &&
-+ test-tool chmtime =1234567890 .git/index &&
-+ test-tool chmtime --get .git/index >out &&
-+ grep ^1234567890 out &&
++ test_set_magic_mtime .git/index &&
+ git status &&
-+ test-tool chmtime --get .git/index >out &&
-+ ! grep ^1234567890 out
++ ! test_is_magic_mtime .git/index
+'
+
test_done
2: dfeabf6af15 ! 4: 4a6b18fb304 update-index: refresh should rewrite index in case of racy timestamps
@@ t/t2108-update-index-refresh-racy.sh (new)
+reset_files () {
+ echo content >file &&
+ echo content >other &&
-+ test-tool chmtime =1234567890 file &&
-+ test-tool chmtime =1234567890 other
++ test_set_magic_mtime file &&
++ test_set_magic_mtime other
+}
+
+update_assert_changed () {
-+ test-tool chmtime =1234567890 .git/index &&
++ test_set_magic_mtime .git/index &&
+ test_might_fail git update-index "$1" &&
-+ test-tool chmtime --get .git/index >.git/out &&
-+ ! grep ^1234567890 .git/out
++ ! test_is_magic_mtime .git/index
+}
+
+test_expect_success 'setup' '
@@ t/t2108-update-index-refresh-racy.sh (new)
+
+test_expect_success '--refresh has no racy timestamps to fix' '
+ reset_files &&
-+ test-tool chmtime =1234567891 .git/index &&
++ # set the index time far enough to the future;
++ # it must be at least 3 seconds for VFAT
++ test_set_magic_mtime .git/index +60 &&
+ git update-index --refresh &&
-+ test-tool chmtime --get .git/index >.git/out &&
-+ grep ^1234567891 .git/out
++ test_is_magic_mtime .git/index +60
+'
+
+test_expect_success '--refresh should fix racy timestamp' '
@@ t/t2108-update-index-refresh-racy.sh (new)
+test_expect_success '--refresh should fix racy timestamp if other file needs update' '
+ reset_files &&
+ echo content2 >other &&
-+ test-tool chmtime =1234567890 other &&
++ test_set_magic_mtime other &&
+ update_assert_changed --refresh
+'
+
+test_expect_success '--refresh should fix racy timestamp if racy file needs update' '
+ reset_files &&
+ echo content2 >file &&
-+ test-tool chmtime =1234567890 file &&
++ test_set_magic_mtime file &&
+ update_assert_changed --refresh
+'
+
--
gitgitgadget
next prev parent reply other threads:[~2022-01-06 22:35 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 13:56 [PATCH] update-index: refresh should rewrite index in case of racy timestamps Marc Strapetz via GitGitGadget
2021-12-22 23:52 ` Junio C Hamano
2021-12-23 18:24 ` Marc Strapetz
2022-01-05 13:15 ` [PATCH v2 0/2] " Marc Strapetz via GitGitGadget
2022-01-05 13:15 ` [PATCH v2 1/2] t7508: add tests capturing racy timestamp handling Marc Strapetz via GitGitGadget
2022-01-05 20:59 ` Junio C Hamano
2022-01-06 10:21 ` Marc Strapetz
2022-01-05 13:15 ` [PATCH v2 2/2] update-index: refresh should rewrite index in case of racy timestamps Marc Strapetz via GitGitGadget
2022-01-05 21:03 ` Junio C Hamano
2022-01-06 22:34 ` Marc Strapetz via GitGitGadget [this message]
2022-01-06 22:34 ` [PATCH v3 1/4] test-lib: introduce API for verifying file mtime Marc Strapetz via GitGitGadget
2022-01-06 23:55 ` Junio C Hamano
2022-01-06 22:34 ` [PATCH v3 2/4] t7508: fix bogus mtime verification Marc Strapetz via GitGitGadget
2022-01-06 22:34 ` [PATCH v3 3/4] t7508: add tests capturing racy timestamp handling Marc Strapetz via GitGitGadget
2022-01-06 22:34 ` [PATCH v3 4/4] update-index: refresh should rewrite index in case of racy timestamps Marc Strapetz via GitGitGadget
2022-01-07 11:17 ` [PATCH v4 0/4] " Marc Strapetz via GitGitGadget
2022-01-07 11:17 ` [PATCH v4 1/4] test-lib: introduce API for verifying file mtime Marc Strapetz via GitGitGadget
2022-01-07 11:17 ` [PATCH v4 2/4] t7508: fix bogus mtime verification Marc Strapetz via GitGitGadget
2022-01-07 11:17 ` [PATCH v4 3/4] t7508: add tests capturing racy timestamp handling Marc Strapetz via GitGitGadget
2022-01-07 11:17 ` [PATCH v4 4/4] update-index: refresh should rewrite index in case of racy timestamps Marc Strapetz via GitGitGadget
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