* [PATCH] progress: no progress in background
@ 2015-04-15 9:34 Luke Mewburn
2015-05-19 5:17 ` Jeff King
0 siblings, 1 reply; 4+ messages in thread
From: Luke Mewburn @ 2015-04-15 9:34 UTC (permalink / raw)
To: gitster; +Cc: git, Luke Mewburn
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Disable the display of the progress if stderr is not the
current foreground process.
Still display the final result when done.
Signed-off-by: Luke Mewburn <luke@mewburn.net>
Acked-by: Nicolas Pitre <nico@fluxnic.net>
---
progress.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/progress.c b/progress.c
index 412e6b1..43d9228 100644
--- a/progress.c
+++ b/progress.c
@@ -72,6 +72,11 @@ static void clear_progress_signal(void)
progress_update = 0;
}
+static int is_foreground_fd(int fd)
+{
+ return getpgid(0) == tcgetpgrp(fd);
+}
+
static int display(struct progress *progress, unsigned n, const char *done)
{
const char *eol, *tp;
@@ -98,16 +103,21 @@ static int display(struct progress *progress, unsigned n, const char *done)
unsigned percent = n * 100 / progress->total;
if (percent != progress->last_percent || progress_update) {
progress->last_percent = percent;
- fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
- progress->title, percent, n,
- progress->total, tp, eol);
- fflush(stderr);
+ if (is_foreground_fd(fileno(stderr)) || done) {
+ fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
+ progress->title, percent, n,
+ progress->total, tp, eol);
+ fflush(stderr);
+ }
progress_update = 0;
return 1;
}
} else if (progress_update) {
- fprintf(stderr, "%s: %u%s%s", progress->title, n, tp, eol);
- fflush(stderr);
+ if (is_foreground_fd(fileno(stderr)) || done) {
+ fprintf(stderr, "%s: %u%s%s",
+ progress->title, n, tp, eol);
+ fflush(stderr);
+ }
progress_update = 0;
return 1;
}
--
2.3.5.1.g63ef1a0
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] progress: no progress in background
2015-04-15 9:34 [PATCH] progress: no progress in background Luke Mewburn
@ 2015-05-19 5:17 ` Jeff King
2015-05-19 5:24 ` [PATCH] progress: treat "no terminal" as being in the foreground Jeff King
2015-05-19 16:12 ` [PATCH] progress: no progress in background Junio C Hamano
0 siblings, 2 replies; 4+ messages in thread
From: Jeff King @ 2015-05-19 5:17 UTC (permalink / raw)
To: Luke Mewburn; +Cc: gitster, git
On Wed, Apr 15, 2015 at 07:34:18PM +1000, Luke Mewburn wrote:
> Disable the display of the progress if stderr is not the
> current foreground process.
> Still display the final result when done.
>
> Signed-off-by: Luke Mewburn <luke@mewburn.net>
> Acked-by: Nicolas Pitre <nico@fluxnic.net>
> ---
> [...]
> +static int is_foreground_fd(int fd)
> +{
> + return getpgid(0) == tcgetpgrp(fd);
> +}
I've noticed that this patch causes a regression when we are
transmitting progress over the sideband channel of the git protocol. You
can see it pretty easily by cloning something large (like the kernel):
git clone --no-local /path/to/linux.git
The "counting objects" phase is generated by the server side and sent
over the sideband, where we show it locally. So you'll get:
remote: Counting objects: 499771
and so on, progressively, until we get to the final value. But with your
patch, we get silence for tens of seconds, and then the final value.
is_foreground_fd never returns true, and we print only once the "done"
flag is set.
The problem is that tcgetpgrp() returns -1 on the server side, because
of course there is no terminal. I suspect this may also break other
esoteric cases where "--progress" has been explicitly specified, but we
don't actually have a terminal (e.g., even something as simple as "ssh
host 'cd repo && git fsck --progress" exhibits the same behavior).
One reasonable fix (I think) would be to treat an error return from
tcgetpgrp() as "yes, we are the foreground", like:
diff --git a/progress.c b/progress.c
index 43d9228..2e31bec 100644
--- a/progress.c
+++ b/progress.c
@@ -74,7 +74,8 @@ static void clear_progress_signal(void)
static int is_foreground_fd(int fd)
{
- return getpgid(0) == tcgetpgrp(fd);
+ int tpgrp = tcgetpgrp(fd);
+ return tpgrp < 0 || tpgrp == getpgid(0);
}
static int display(struct progress *progress, unsigned n, const char *done)
But I don't know if that messes up any other cases you were trying to
hit. We could also check that errno == ENOTTY, but I'm not sure it's
worth it. Whatever the reason, it probably makes sense to err on the
side of printing the progress.
-Peff
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] progress: treat "no terminal" as being in the foreground
2015-05-19 5:17 ` Jeff King
@ 2015-05-19 5:24 ` Jeff King
2015-05-19 16:12 ` [PATCH] progress: no progress in background Junio C Hamano
1 sibling, 0 replies; 4+ messages in thread
From: Jeff King @ 2015-05-19 5:24 UTC (permalink / raw)
To: Luke Mewburn; +Cc: gitster, git
On Tue, May 19, 2015 at 01:17:52AM -0400, Jeff King wrote:
> One reasonable fix (I think) would be to treat an error return from
> tcgetpgrp() as "yes, we are the foreground", like:
I think I convinced myself this is the right fix. So here it is, all
wrapped up with a commit message. I'd love to hear confirmation, though.
:)
-- >8 --
progress: treat "no terminal" as being in the foreground
Commit 85cb890 (progress: no progress in background,
2015-04-13) avoids sending progress from background
processes by checking that the process group id of the
current process is the same as that of the controlling
terminal.
If we don't have a terminal, however, this check never
succeeds, and we print no progress at all (until the final
"done" message). This can be seen when cloning a large
repository; instead of getting progress updates for
"counting objects", it will appear to hang then print the
final count.
We can fix this by treating an error return from tcgetpgrp()
as a signal to show the progress.
Signed-off-by: Jeff King <peff@peff.net>
---
progress.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/progress.c b/progress.c
index 43d9228..2e31bec 100644
--- a/progress.c
+++ b/progress.c
@@ -74,7 +74,8 @@ static void clear_progress_signal(void)
static int is_foreground_fd(int fd)
{
- return getpgid(0) == tcgetpgrp(fd);
+ int tpgrp = tcgetpgrp(fd);
+ return tpgrp < 0 || tpgrp == getpgid(0);
}
static int display(struct progress *progress, unsigned n, const char *done)
--
2.4.1.396.g7ba6d7b
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] progress: no progress in background
2015-05-19 5:17 ` Jeff King
2015-05-19 5:24 ` [PATCH] progress: treat "no terminal" as being in the foreground Jeff King
@ 2015-05-19 16:12 ` Junio C Hamano
1 sibling, 0 replies; 4+ messages in thread
From: Junio C Hamano @ 2015-05-19 16:12 UTC (permalink / raw)
To: Jeff King; +Cc: Luke Mewburn, git
Jeff King <peff@peff.net> writes:
>> +static int is_foreground_fd(int fd)
>> +{
>> + return getpgid(0) == tcgetpgrp(fd);
>> +}
>
> I've noticed that this patch causes a regression when we are
> transmitting progress over the sideband channel of the git protocol.
Yeah, thanks. The other day when an unrelated progress issues came,
I realized that this patch has that breakage (and immediately forgot
about it ;-).
> ... Whatever the reason, it probably makes sense to err on the
> side of printing the progress.
Yup. Thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-05-19 16:12 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-04-15 9:34 [PATCH] progress: no progress in background Luke Mewburn
2015-05-19 5:17 ` Jeff King
2015-05-19 5:24 ` [PATCH] progress: treat "no terminal" as being in the foreground Jeff King
2015-05-19 16:12 ` [PATCH] progress: no progress in background Junio C Hamano
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