Use parentheses and pipes to present alternatives in the argument help
for the --empty options of git am and git rebase, like in the rest of
the documentation.
While at it remove a stray use of the enum empty_action value
STOP_ON_EMPTY_COMMIT to indicate that no short option is present.
While it has a value of 0 and thus there is no user-visible change,
that enum is not meant to hold short option characters. Hard-code 0,
like we do for other options without a short option.
Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Fix a minor regression that some compiler might notice.
* 'jk/function-pointer-mismatches-fix' (early part):
fsck: use enum object_type for fsck_walk callback
We switched the function interface for fsck callbacks in a1aad71601
(fsck.h: use "enum object_type" instead of "int", 2021-03-28). However,
we accidentally flipped the type back to "int" as part of 0b4e9013f1
(fsck: mark unused parameters in various fsck callbacks, 2023-07-03).
The mistake happened because that commit was written before a1aad71601
and rebased forward, and I screwed up while resolving the conflict.
Curiously, the compiler does not warn about this mismatch, at least not
when using gcc and clang on Linux (nor in any of our CI environments).
Based on 28abf260a5 (builtin/fsck.c: don't conflate "int" and "enum" in
callback, 2021-06-01), I'd guess that this would cause the AIX xlc
compiler to complain. I noticed because clang-18's UBSan now identifies
mis-matched function calls at runtime, and does complain of this case
when running the test suite.
I'm not entirely clear on whether this mismatch is a problem in
practice. Compilers are certainly free to make enums smaller than "int"
if they don't need the bits, but I suspect that they have to promote
back to int for function calls (though I didn't dig in the standard, and
I won't be surprised if I'm simply wrong and the real-world impact would
depend on the ABI).
Regardless, switching it back to enum is obviously the right thing to do
here; the switch to "int" was simply a mistake.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Typo/grammofix to documentation added during this cycle.
* tl/notes-separator:
notes doc: tidy up `--no-stripspace` paragraph
notes doc: split up run-on sentences
With `--stdin`, we read *from* standard input, not *for*.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When commit 00bf685975 (show-ref doc: update for internal consistency,
2023-05-19) switched from double quotes to backticks around our {caret}
macro, we started rendering "{caret}" literally. Fix this by replacing
by a "^" character.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Where we document the `--no-stripspace` option, remove a superfluous
"For" to fix the grammar. Mark option names and command names using
`backticks` to set them in monospace.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When commit c4e2aa7d45 (notes.c: introduce "--[no-]stripspace" option,
2023-05-27) mentioned the new `--no-stripspace` in the documentation for
`-m` and `-F`, it created run-on sentences. It also used slightly
different language in the two sections for no apparent reason. Split the
sentences in two to improve readability, and while touching the two
sites, make them more similar.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
* 'master' of github.com:git/git: (34 commits)
Git 2.42-rc2
t4053: avoid writing to unopened pipe
t4053: avoid race when killing background processes
Git 2.42-rc1
git maintenance: avoid console window in scheduled tasks on Windows
win32: add a helper to run `git.exe` without a foreground window
t9001: remove excessive GIT_SEND_EMAIL_NOTTY=1
mv: handle lstat() failure correctly
parse-options: disallow negating OPTION_SET_INT 0
repack: free geometry struct
send-email: avoid creating more than one Term::ReadLine object
send-email: drop FakeTerm hack
t0040: declare non-tab indentation to be okay in this script
advice: handle "rebase" in error_resolve_conflict()
A few more topics before -rc1
mailmap: change primary address for Glen Choo
gitignore: ignore clangd .cache directory
docs: update when `git bisect visualize` uses `gitk`
compat/mingw: implement a native locate_in_PATH()
run-command: conditionally define locate_in_PATH()
...
Windows updates.
* ds/maintenance-on-windows-fix:
git maintenance: avoid console window in scheduled tasks on Windows
win32: add a helper to run `git.exe` without a foreground window
Adjust to newer Term::ReadLine to prevent it from breaking
the interactive prompt code in send-email.
* jk/send-email-with-new-readline:
send-email: avoid creating more than one Term::ReadLine object
send-email: drop FakeTerm hack
Developer support to detect meaningless combination of options.
* rs/parse-opt-forbid-set-int-0-without-noneg:
parse-options: disallow negating OPTION_SET_INT 0
This fixes an occasional hang I see when running t4053 with
--verbose-log using dash.
Commit 1e3f26542a (diff --no-index: support reading from named pipes,
2023-07-05) added a test that "diff --no-index" will complain when
comparing a named pipe and a directory. The minimum we need to test this
is to mkfifo the pipe, and then run "git diff --no-index pipe some_dir".
But the test does one thing more: it spawns a background shell process
that opens the pipe for writing, like this:
{
(>pipe) &
} &&
This extra writer _could_ be useful if Git misbehaves and tries to open
the pipe for reading. Without the writer, Git would block indefinitely
and the test would never end. But since we do not have such a bug, Git
does not open the pipe and it is the writing process which will block
indefinitely, since there are no readers. The test addresses this by
running "kill $!" in a test_when_finished block. Since the writer should
be blocking forever, this kill command will reliably find it waiting.
However, this seems to be somewhat racy, in that the writing process
sometimes hangs around even after the "kill". In a normal run of the
test script without options, this doesn't have any effect; the
main test script completes anyway. But with --verbose-log, we spawn a
"tee" process that reads the script output, and it won't end until all
descriptors pointing to its input pipe are closed. And the background
process that is hanging around still has its stderr, etc, pointed into
that pipe.
You can reproduce the situation like this:
cd t
./t4053-diff-no-index.sh --verbose-log --stress
Let that run for a few minutes, and then you'll find that some of the
runs have hung. For example, at 11:53, I ran:
$ ps xk start o pid,start,command | grep tee | head
713459 11:48:06 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-9.out
713527 11:48:06 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-15.out
719434 11:48:07 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-1.out
728117 11:48:08 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-5.out
738738 11:48:09 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-31.out
739457 11:48:09 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-27.out
744432 11:48:10 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-21.out
744471 11:48:10 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-29.out
761961 11:48:12 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-0.out
812299 11:48:19 tee -a /home/peff/compile/git/t/test-results/t4053-diff-no-index.stress-8.out
All of these have been hung for several minutes. We can investigate one
and see that it's waiting to get EOF on its input:
$ strace -p 713459
strace: Process 713459 attached
read(0,
^C
Who else has that descriptor open?
$ lsof -a -p 713459 -d 0 +E
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
tee 713459 peff 0r FIFO 0,13 0t0 3943636 pipe 719203,sh,5w 719203,sh,7w 719203,sh,12w 719203,sh,13w
sh 719203 peff 5w FIFO 0,13 0t0 3943636 pipe 713459,tee,0r 719203,sh,7w 719203,sh,12w 719203,sh,13w
sh 719203 peff 7w FIFO 0,13 0t0 3943636 pipe 713459,tee,0r 719203,sh,5w 719203,sh,12w 719203,sh,13w
sh 719203 peff 12w FIFO 0,13 0t0 3943636 pipe 713459,tee,0r 719203,sh,5w 719203,sh,7w 719203,sh,13w
sh 719203 peff 13w FIFO 0,13 0t0 3943636 pipe 713459,tee,0r 719203,sh,5w 719203,sh,7w 719203,sh,12w
It's a shell, presumably a subshell spawned by the main script. Though
it may seem odd, having the same descriptor open several times is not
unreasonable (they're all basically the original stdout/stderr of the
script that has been copied). And they should all close when the process
exits. So what's it doing? Curiously, it will exit as soon as we strace
it:
$ strace -s 64 -p 719203
strace: Process 719203 attached
openat(AT_FDCWD, "pipe", O_WRONLY|O_CREAT|O_TRUNC, 0666) = -1 ENOENT (No such file or directory)
write(2, "./t4053-diff-no-index.sh: 7: eval: ", 35) = 35
write(2, "cannot create pipe: Directory nonexistent", 41) = 41
write(2, "\n", 1) = 1
exit_group(2) = ?
+++ exited with 2 +++
I think what happens is this:
- it is blocking in the openat() call for the pipe, as we expect (so
this is definitely the backgrounded subshell mentioned above)
- strace sends signals (probably STOP/CONT); those cause the kernel to
stop blocking, but libc will restart the system call automatically
- by this time, the "pipe" fifo is gone, so we'll actually try to
create a regular file. But of course the surrounding directory is
gone, too! So we get ENOENT, and then exit as normal.
So the blocking is something we expect to happen. But what we didn't
expect is for the process to still exist at all! It should have been
killed earlier when the parent process called "kill", but it wasn't. And
we can't catch the race at this point, because it happened much earlier.
One can guess, though, that there is some race with the shell setting up
the signal handling in the backgrounded subshell, and possibly blocking
or ignoring signals at the time that the "kill" is received. Curiously,
the race does not seem to happen if I use "bash" instead of "dash", so
presumably bash's setup here is more atomic.
One fix might be to try killing the subshell more aggressively, either
using SIGKILL, or looping on kill/wait. But that seems complex and
likely to introduce new problems/races. Instead, we can observe that the
writer is not needed at all. Git will notice the pipe via stat() before
it is ever opened. So we can simply drop the writer subshell entirely.
If we ever changed Git to open the path and fstat() it, this would
result in the test hanging. But we're not likely to do that. After all,
we have to stat() paths to see if they are openable at all (e.g., it
could be a directory), so this seems like a low risk. And anybody who
does make such a change will immediately see the issue, as Git would
hang consistently.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
The test 'diff --no-index reads from pipes' starts a couple of
background processes that write to the pipes that are passed to "diff
--no-index". If the test passes then we expect these processes to exit
as all their output will have been read. However if the test fails
then we want to make sure they do not hang about on the users machine
and the test remembers they should be killed by calling
test_when_finished "! kill $!"
after each background process is created. Unfortunately there is a
race where test_when_finished may run before the background process
exits even when all its output has been read resulting in the kill
command succeeding which causes the test to fail. Fix this by ignoring
the exit status of the kill command. If the diff is successful we
could instead wait for the background process to exit and check their
status but that feels like it is testing the platform's printf
implementation rather than git's code.
Reported-by: Jeff King <peff@peff.net>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
"git rebase -i" with a series of squash/fixup, when one of the
steps stopped in conflicts and ended up getting skipped, did not
handle the accumulated commit log messages, which has been
corrected.
* pw/rebase-skip-commit-message-fix:
rebase --skip: fix commit message clean up when skipping squash
"git bisect visualize" stopped running "gitk" on Git for Windows
when the command was reimplemented in C around Git 2.34 timeframe.
This has been corrected.
* ma/locate-in-path-for-windows:
docs: update when `git bisect visualize` uses `gitk`
compat/mingw: implement a native locate_in_PATH()
run-command: conditionally define locate_in_PATH()
Exclude "." from the set of characters to be removed from the
beginning and the end of the human-readable name.
* bc/ident-dot-is-no-longer-crud-letter:
ident: don't consider '.' a crud
Adjust to OpenSSL 3+, which deprecates its SHA-1 functions based on
its traditional API, by using its EVP API instead.
* ew/hash-with-openssl-evp:
avoid SHA-1 functions deprecated in OpenSSL 3+
sha256: avoid functions deprecated in OpenSSL 3+
We just introduced a helper to avoid showing a console window when the
scheduled task runs `git.exe`. Let's actually use it.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
On Windows, there are two kinds of executables, console ones and
non-console ones. Git's executables are all console ones.
When launching the former e.g. in a scheduled task, a CMD window pops
up. This is not what we want for the tasks installed via the `git
maintenance` command.
To work around this, let's introduce `headless-git.exe`, which is a
non-console program that does _not_ pop up any window. All it does is to
re-launch `git.exe`, suppressing that console window, passing through
all command-line arguments as-are.
Helped-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Helped-by: Yuyi Wang <Strawberry_Str@hotmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
