From: Patrick Steinhardt <ps@pks•im>
To: Adrian Ratiu <adrian.ratiu@collabora•com>
Cc: git@vger•kernel.org, "Emily Shaffer" <emilyshaffer@google•com>,
"Rodrigo Damazio Bovendorp" <rdamazio@google•com>,
"Junio C Hamano" <gitster@pobox•com>,
"Josh Steadmon" <steadmon@google•com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail•com>
Subject: Re: [PATCH 01/10] run-command: add stdin callback for parallelization
Date: Thu, 2 Oct 2025 08:34:18 +0200 [thread overview]
Message-ID: <aN4c6l7gRi4auss1@pks.im> (raw)
In-Reply-To: <20250925125352.1728840-2-adrian.ratiu@collabora.com>
On Thu, Sep 25, 2025 at 03:53:44PM +0300, Adrian Ratiu wrote:
> diff --git a/run-command.c b/run-command.c
> index ed9575bd6a..6c455a0e43 100644
> --- a/run-command.c
> +++ b/run-command.c
> @@ -1652,6 +1652,44 @@ static int pp_start_one(struct parallel_processes *pp,
> return 0;
> }
>
> +static void pp_buffer_stdin(struct parallel_processes *pp,
> + const struct run_process_parallel_opts *opts)
> +{
> + /* Buffer stdin for each pipe. */
> + for (int i = 0; i < opts->processes; i++) {
`opts->processes` is of type `size_t`, so let's use the same type as
iterator.
> + struct child_process *proc = &pp->children[i].process;
> + int ret;
> +
> + if (pp->children[i].state != GIT_CP_WORKING || proc->in <= 0)
> + continue;
> +
> + /**
Nit: multi-line comments should start with "/*", not "/**". This is also
present in multiple other
> + * child input is provided via path_to_stdin when the feed_pipe cb is
> + * missing, so we just signal an EOF.
> + */
> + if (!opts->feed_pipe) {
> + close(proc->in);
> + proc->in = 0;
Hm. It's curious that we use a valid file descriptor here. Shouldn't we
rather use `-1`? Otherwise I could see that we might try to close this
seemingly valid file descriptor at a later point in time.
> + continue;
> + }
> +
> + /**
> + * Feed the pipe:
> + * ret < 0 means error
> + * ret == 0 means there is more data to be fed
> + * ret > 0 means feeding finished
> + */
> + ret = opts->feed_pipe(proc->in, opts->data, pp->children[i].data);
> + if (ret < 0)
> + die_errno("feed_pipe");
> +
> + if (ret == 1) {
This condition mismatches the comment: you explicitly check for 1, but
the comment above says `ret > 0` indicates that feeding has finished.
> @@ -1756,6 +1795,33 @@ static int pp_collect_finished(struct parallel_processes *pp,
> return result;
> }
>
> +static void pp_handle_child_IO(struct parallel_processes *pp,
> + const struct run_process_parallel_opts *opts,
> + int output_timeout)
Okay, this function is new and was extracted out of
`run_processes_parallel()`. It's basically the heart of our I/O loop
for our children.
> +{
> + /*
> + * First push input, if any (it might no-op), to child tasks to avoid them blocking
> + * after input. This also prevents deadlocks when ungrouping below, if a child blocks
> + * while the parent also waits for them to finish.
> + */
> + pp_buffer_stdin(pp, opts);
This part is new, as we now know to also optionally write stdin to the
child process.
> + if (opts->ungroup) {
> + for (size_t i = 0; i < opts->processes; i++) {
> + int child_ready_for_cleanup =
> + pp->children[i].state == GIT_CP_WORKING &&
> + pp->children[i].process.in == 0;
> +
> + if (child_ready_for_cleanup)
> + pp->children[i].state = GIT_CP_WAIT_CLEANUP;
And this part here has changed, as well. We don't unconditionally set
`GIT_CP_WAIT_CLEANUP` anymore, but wait for `process.in` to be closed.
> + }
> + return;
I feel like this return is easy to miss. I think an `else` branch would
be more obvious.
> @@ -1775,6 +1841,13 @@ void run_processes_parallel(const struct run_process_parallel_opts *opts)
> "max:%"PRIuMAX,
> (uintmax_t)opts->processes);
>
> + /*
> + * Child tasks might receive input via stdin, terminating early (or not), so
> + * ignore the default SIGPIPE which gets handled by each feed_pipe_fn which
> + * actually writes the data to children stdin fds.
> + */
> + sigchain_push(SIGPIPE, SIG_IGN);
> +
> pp_init(&pp, opts, &pp_sig);
> while (1) {
> for (i = 0;
Yeah, makes sense. I was briefly wondering whether we should rather do
it as part of `pp_buffer_stdin()`, so that it's more contained. But I'm
not sure that buys us anything.
> @@ -1809,8 +1876,11 @@ void run_processes_parallel(const struct run_process_parallel_opts *opts)
>
> pp_cleanup(&pp, opts);
>
> + sigchain_pop(SIGPIPE);
> +
There are no early exits, so we know this code should be executed.
> if (do_trace2)
> trace2_region_leave(tr2_category, tr2_label, NULL);
> +
> }
>
> int prepare_auto_maintenance(int quiet, struct child_process *maint)
Nit: stray empty line.
> diff --git a/run-command.h b/run-command.h
> index 0df25e445f..4679987c8e 100644
> --- a/run-command.h
> +++ b/run-command.h
> @@ -420,6 +420,22 @@ typedef int (*start_failure_fn)(struct strbuf *out,
> void *pp_cb,
> void *pp_task_cb);
>
> +/**
> + * This callback is repeatedly called on every child process who requests
> + * start_command() to create a pipe by setting child_process.in < 0.
> + *
> + * pp_cb is the callback cookie as passed into run_processes_parallel, and
> + * pp_task_cb is the callback cookie as passed into get_next_task_fn.
> + * The contents of 'send' will be read into the pipe and passed to the pipe.
> + *
> + * Returns < 0 for error
> + * Returns == 0 when there is more data to be fed (will be called again)
> + * Returns > 0 when finished (child closes fd or no more data to be fed)
s/closes/closed/
> diff --git a/t/helper/test-run-command.c b/t/helper/test-run-command.c
> index 3719f23cc2..dfdb03b3ab 100644
> --- a/t/helper/test-run-command.c
> +++ b/t/helper/test-run-command.c
This helper very much looks like it should be converted to a unit test.
Anyway, that is outside of the scope of this patch series.
> diff --git a/t/t0061-run-command.sh b/t/t0061-run-command.sh
> index 76d4936a87..282afecefc 100755
> --- a/t/t0061-run-command.sh
> +++ b/t/t0061-run-command.sh
> @@ -164,6 +164,36 @@ test_expect_success 'run_command runs ungrouped in parallel with more tasks than
> test_line_count = 4 err
> '
>
> +cat >expect <<-EOF
> +preloaded output of a child
> +listening for stdin:
> +sample stdin 1
> +sample stdin 0
> +preloaded output of a child
> +listening for stdin:
> +sample stdin 1
> +sample stdin 0
> +preloaded output of a child
> +listening for stdin:
> +sample stdin 1
> +sample stdin 0
> +preloaded output of a child
> +listening for stdin:
> +sample stdin 1
> +sample stdin 0
> +EOF
This block should be part of the test itself.
> +test_expect_success 'run_command listens to stdin' '
> + write_script stdin-script <<-\EOF &&
> + echo "listening for stdin:"
> + while read line; do
Style nit: let's drop the `;` and move the `do` to the next line.
> + echo "$line"
> + done
> + EOF
> + test-tool run-command run-command-stdin 2 ./stdin-script 2>actual &&
> + test_cmp expect actual
> +'
Patrick
next prev parent reply other threads:[~2025-10-02 6:34 UTC|newest]
Thread overview: 187+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-25 12:53 [PATCH 00/10] Convert remaining hooks to hook.h Adrian Ratiu
2025-09-25 12:53 ` [PATCH 01/10] run-command: add stdin callback for parallelization Adrian Ratiu
2025-10-02 6:34 ` Patrick Steinhardt [this message]
2025-10-02 15:46 ` Junio C Hamano
2025-10-06 13:01 ` Adrian Ratiu
2025-10-06 12:59 ` Adrian Ratiu
2025-10-14 17:35 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 02/10] hook: provide stdin via callback Adrian Ratiu
2025-09-25 20:05 ` Junio C Hamano
2025-09-26 12:03 ` Adrian Ratiu
2025-10-10 19:57 ` Emily Shaffer
2025-10-13 14:47 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 03/10] hook: convert 'post-rewrite' hook in sequencer.c to hook.h Adrian Ratiu
2025-09-25 20:15 ` Junio C Hamano
2025-09-26 12:29 ` Adrian Ratiu
2025-09-26 14:12 ` Phillip Wood
2025-09-26 15:53 ` Adrian Ratiu
2025-09-29 10:11 ` Phillip Wood
2025-09-26 17:52 ` Junio C Hamano
2025-09-29 7:33 ` Adrian Ratiu
2025-10-02 6:34 ` Patrick Steinhardt
2025-10-08 7:04 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 04/10] transport: convert pre-push hook " Adrian Ratiu
2025-09-25 18:58 ` D. Ben Knoble
2025-09-26 13:02 ` Adrian Ratiu
2025-09-26 14:11 ` Phillip Wood
2025-09-29 11:33 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 05/10] reference-transaction: use hook.h to run hooks Adrian Ratiu
2025-09-25 21:45 ` Junio C Hamano
2025-09-26 13:03 ` Adrian Ratiu
2025-10-02 6:34 ` Patrick Steinhardt
2025-10-08 12:26 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 06/10] run-command: allow capturing of collated output Adrian Ratiu
2025-09-25 21:52 ` Junio C Hamano
2025-09-26 14:14 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 07/10] hooks: allow callers to capture output Adrian Ratiu
2025-09-25 12:53 ` [PATCH 08/10] receive-pack: convert 'update' hook to hook.h Adrian Ratiu
2025-09-25 21:53 ` Junio C Hamano
2025-10-10 19:57 ` Emily Shaffer
2025-10-17 8:27 ` Adrian Ratiu
2025-09-25 12:53 ` [PATCH 09/10] post-update: use hook.h library Adrian Ratiu
2025-09-25 18:02 ` [PATCH 10/10] receive-pack: convert receive hooks to hook.h Adrian Ratiu
2025-10-10 19:57 ` [PATCH 00/10] Convert remaining " Emily Shaffer
2025-10-17 14:15 ` [PATCH v2 " Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 01/10] run-command: add stdin callback for parallelization Adrian Ratiu
2025-10-21 7:40 ` Patrick Steinhardt
2025-10-17 14:15 ` [PATCH v2 02/10] hook: provide stdin via callback Adrian Ratiu
2025-10-21 7:41 ` Patrick Steinhardt
2025-10-21 7:41 ` Patrick Steinhardt
2025-10-21 14:44 ` Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 03/10] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2025-10-21 7:41 ` Patrick Steinhardt
2025-10-21 15:44 ` Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 04/10] transport: convert pre-push " Adrian Ratiu
2025-10-21 7:41 ` Patrick Steinhardt
2025-10-21 16:04 ` Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 05/10] reference-transaction: use hook API instead of run-command Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 06/10] hook: allow overriding the ungroup option Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 07/10] run-command: allow capturing of collated output Adrian Ratiu
2025-10-21 7:41 ` Patrick Steinhardt
2025-10-21 16:25 ` Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 08/10] hooks: allow callers to capture output Adrian Ratiu
2025-10-17 14:15 ` [PATCH v2 09/10] receive-pack: convert update hooks to new API Adrian Ratiu
2025-10-28 18:39 ` Kristoffer Haugsbakk
2025-10-17 14:15 ` [PATCH v2 10/10] receive-pack: convert receive hooks to hook API Adrian Ratiu
2025-10-21 7:41 ` Patrick Steinhardt
2025-10-28 18:42 ` Kristoffer Haugsbakk
2025-10-29 13:46 ` Adrian Ratiu
2025-10-29 13:50 ` Kristoffer Haugsbakk
2025-11-15 19:48 ` Junio C Hamano
2025-11-17 16:51 ` Adrian Ratiu
2025-10-21 7:40 ` [PATCH v2 00/10] Convert remaining hooks to hook.h Patrick Steinhardt
2025-10-21 16:34 ` Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 " Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 01/10] run-command: add stdin callback for parallelization Adrian Ratiu
2025-11-25 23:15 ` Junio C Hamano
2025-11-27 12:00 ` Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 02/10] hook: provide stdin via callback Adrian Ratiu
2025-11-29 13:03 ` Adrian Ratiu
2025-11-29 22:21 ` Junio C Hamano
2025-12-01 13:26 ` Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 03/10] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 04/10] transport: convert pre-push " Adrian Ratiu
2025-11-24 22:55 ` Junio C Hamano
2025-11-27 14:24 ` Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 05/10] reference-transaction: use hook API instead of run-command Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 06/10] hook: allow overriding the ungroup option Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 07/10] run-command: allow capturing of collated output Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 08/10] hooks: allow callers to capture output Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 09/10] receive-pack: convert update hooks to new API Adrian Ratiu
2025-11-24 17:20 ` [PATCH v3 10/10] receive-pack: convert receive hooks to hook API Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 00/11] Convert remaining hooks to hook.h Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 01/11] run-command: add first helper for pp child states Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 02/11] run-command: add stdin callback for parallelization Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 03/11] hook: provide stdin via callback Adrian Ratiu
2025-12-16 8:08 ` Patrick Steinhardt
2025-12-04 14:15 ` [PATCH v4 04/11] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 05/11] transport: convert pre-push " Adrian Ratiu
2025-12-16 8:08 ` Patrick Steinhardt
2025-12-16 9:09 ` Adrian Ratiu
2025-12-16 9:30 ` Patrick Steinhardt
2025-12-17 23:07 ` Junio C Hamano
2025-12-04 14:15 ` [PATCH v4 06/11] reference-transaction: use hook API instead of run-command Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 07/11] hook: allow overriding the ungroup option Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 08/11] run-command: allow capturing of collated output Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 09/11] hooks: allow callers to capture output Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 10/11] receive-pack: convert update hooks to new API Adrian Ratiu
2025-12-16 8:08 ` Patrick Steinhardt
2025-12-16 9:22 ` Adrian Ratiu
2025-12-04 14:15 ` [PATCH v4 11/11] receive-pack: convert receive hooks to hook API Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 00/11] Convert remaining hooks to hook.h Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 01/11] run-command: add first helper for pp child states Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 02/11] run-command: add stdin callback for parallelization Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 03/11] hook: provide stdin via callback Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 04/11] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 05/11] transport: convert pre-push " Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 06/11] reference-transaction: use hook API instead of run-command Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 07/11] hook: allow overriding the ungroup option Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 08/11] run-command: allow capturing of collated output Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 09/11] hooks: allow callers to capture output Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 10/11] receive-pack: convert update hooks to new API Adrian Ratiu
2025-12-18 17:11 ` [PATCH v5 11/11] receive-pack: convert receive hooks to hook API Adrian Ratiu
2025-12-19 12:38 ` Patrick Steinhardt
2025-12-20 10:40 ` Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 00/11] Convert remaining hooks to hook.h Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 01/11] run-command: add first helper for pp child states Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 02/11] run-command: add stdin callback for parallelization Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 03/11] hook: provide stdin via callback Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 04/11] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 05/11] transport: convert pre-push " Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 06/11] reference-transaction: use hook API instead of run-command Adrian Ratiu
2026-01-18 12:23 ` SZEDER Gábor
2026-01-18 18:30 ` Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 07/11] hook: allow overriding the ungroup option Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 08/11] run-command: allow capturing of collated output Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 09/11] hooks: allow callers to capture output Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 10/11] receive-pack: convert update hooks to new API Adrian Ratiu
2025-12-26 12:23 ` [PATCH v6 11/11] receive-pack: convert receive hooks to hook API Adrian Ratiu
2025-12-28 11:32 ` [PATCH v6 00/11] Convert remaining hooks to hook.h Junio C Hamano
2026-01-05 10:52 ` Adrian Ratiu
2026-01-05 12:13 ` Patrick Steinhardt
2026-01-21 21:54 ` [PATCH v7 00/12] " Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 01/12] t1800: add hook output stream tests Adrian Ratiu
2026-01-21 22:16 ` Junio C Hamano
2026-01-22 9:19 ` Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 02/12] run-command: add first helper for pp child states Adrian Ratiu
2026-01-21 23:01 ` Junio C Hamano
2026-01-22 9:21 ` Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 03/12] run-command: add stdin callback for parallelization Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 04/12] hook: provide stdin via callback Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 05/12] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 06/12] hook: allow separate std[out|err] streams Adrian Ratiu
2026-01-23 7:19 ` Patrick Steinhardt
2026-01-23 7:47 ` Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 07/12] transport: convert pre-push to hook API Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 08/12] reference-transaction: use hook API instead of run-command Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 09/12] hook: add jobs option Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 10/12] run-command: poll child stdin in addition to stdout Adrian Ratiu
2026-01-21 22:04 ` Kristoffer Haugsbakk
2026-01-22 9:57 ` Adrian Ratiu
2026-01-21 23:11 ` Junio C Hamano
2026-01-22 10:58 ` Adrian Ratiu
2026-01-22 17:20 ` Junio C Hamano
2026-01-26 23:20 ` Emily Shaffer
2026-01-27 0:11 ` Junio C Hamano
2026-01-27 10:10 ` Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 11/12] receive-pack: convert update hooks to new API Adrian Ratiu
2026-01-21 22:14 ` Kristoffer Haugsbakk
2026-01-22 9:26 ` Adrian Ratiu
2026-01-27 0:12 ` Emily Shaffer
2026-01-27 13:05 ` Adrian Ratiu
2026-01-21 21:54 ` [PATCH v7 12/12] receive-pack: convert receive hooks to hook API Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 00/12] Convert remaining hooks to hook.h Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 01/12] t1800: add hook output stream tests Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 02/12] run-command: add helper for pp child states Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 03/12] run-command: add stdin callback for parallelization Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 04/12] hook: provide stdin via callback Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 05/12] hook: convert 'post-rewrite' hook in sequencer.c to hook API Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 06/12] hook: allow separate std[out|err] streams Adrian Ratiu
2026-02-02 3:17 ` Chris Darroch
2026-02-02 16:32 ` Junio C Hamano
2026-01-28 21:39 ` [PATCH v8 07/12] transport: convert pre-push to hook API Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 08/12] reference-transaction: use hook API instead of run-command Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 09/12] hook: add jobs option Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 10/12] run-command: poll child input in addition to output Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 11/12] receive-pack: convert update hooks to new API Adrian Ratiu
2026-01-28 21:39 ` [PATCH v8 12/12] receive-pack: convert receive hooks to hook API Adrian Ratiu
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