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Subject: bug#43364: Possible bug with output redirection
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Dear guilers,
When using with-output-to-string, the output of external processes
started using system* and the like is not redirected to the temporary
port. As far as I can tell, it just redirects things written/displayed
from within guile.
This seems to be a bug, or if this is intended behaviour it might be
beneficial to document this somewhere.
As an example:
I'd expect snippet [0] to behave like snippet [1] and return "bar",
instead it just returns the empty string.
This probably affects other similar functions.
Pandemically,
pinoaffe
[0]:
(with-output-to-string
(lambda ()
(system* "echo" "bar")))
[1]:
(with-output-to-string
(lambda ()
(display "bar")))
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: pinoaffe <pinoaffe@HIDDEN> Subject: bug#43364: Acknowledgement (Possible bug with output redirection) Message-ID: <handler.43364.B.159994436920364.ack <at> debbugs.gnu.org> References: <20200912225923.5fa9504e@HIDDEN> X-Gnu-PR-Message: ack 43364 X-Gnu-PR-Package: guile Reply-To: 43364 <at> debbugs.gnu.org Date: Sat, 12 Sep 2020 21:00:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guile@HIDDEN If you wish to submit further information on this problem, please send it to 43364 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 43364: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D43364 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#43364: Possible bug with output redirection
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On Sat, Sep 12, 2020 at 10:59:23PM +0200, pinoaffe wrote:
> Dear guilers,
>=20
> When using with-output-to-string, the output of external processes
> started using system* and the like is not redirected to the temporary
> port. As far as I can tell, it just redirects things written/displayed
> from within guile.
> This seems to be a bug, or if this is intended behaviour it might be
> beneficial to document this somewhere.
I think this is intentional (or rather: out of Guile's scope). While the
Guile process's output functions are the scope of `with-output-to-string',
the subprocess started with `system' just happens to inherit the standard
output file descriptor, which is an operating system mechanism.
No idea, for example, about what would happen under Windows or other
(more or less) operating systems.
But you are right that it can be a bit confusing. I'm not sure whether a
hint in the doc would be in place.
What do oters think?
Cheers
-- t
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X-Loop: help-debbugs@HIDDEN
Subject: bug#43364: with-output-to-port works with file ports
References: <20200912225923.5fa9504e@HIDDEN>
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Hi,
In an interesting (or perhaps maddening) inconsistency,
'with-output-to-port' captures stdout from system* here
(call-with-output-file "/tmp/test.log"
(lambda (port)
(with-output-to-port
port
(lambda ()
(system* "mktemp" "-d")))))
but 'with-output-to-string' does not do so here
(with-output-to-string
(lambda ()
(system* "mktemp" "-d")))
According to lloda on #guile, system* handles the redirection only
when the current ports are file ports. Thanks for that pointer!
Kind regards
Felix
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Subject: bug#43364: with-output-to-port works with file ports
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From: Ricardo Wurmus <rekado@HIDDEN>
Date: Fri, 08 Sep 2023 21:06:11 +0200
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Felix Lechner via "Bug reports for GUILE, GNU's Ubiquitous Extension Langua=
ge" <bug-guile@HIDDEN> writes:
> Hi,
>
> In an interesting (or perhaps maddening) inconsistency,
> 'with-output-to-port' captures stdout from system* here
>
> (call-with-output-file "/tmp/test.log"
> (lambda (port)
> (with-output-to-port
> port
> (lambda ()
> (system* "mktemp" "-d")))))
>
> but 'with-output-to-string' does not do so here
>
> (with-output-to-string
> (lambda ()
> (system* "mktemp" "-d")))
>
> According to lloda on #guile, system* handles the redirection only
> when the current ports are file ports. Thanks for that pointer!
That=E2=80=99s correct. I=E2=80=99ve been using the following monstrosity =
to capture
and process output. Perhaps someone finds a prettier way?
--8<---------------cut here---------------start------------->8---
(define* (call-with-output-processor command proc #:optional capture-stderr=
?)
"Silently execute COMMAND, a list of strings representing an
executable with its arguments, and apply PROC to every line printed to
standard output and, optionally when CAPTURE-STDERR? is #T, standard
error. Return the exit status of COMMAND."
;; We can only capture a program's standard error by parameterizing
;; current-error-port to a *file* port before using system* or
;; open-pipe*. The process will write its standard error stream to
;; the provided file descriptor. Meanwhile we read from the file
;; descriptor (blocking) for new lines until the process exits.
(match (socketpair PF_UNIX SOCK_STREAM 0)
((in . out)
(let ((err (if capture-stderr?
(dup out)
(%make-void-port "w"))))
(catch #true
(lambda ()
(let ((thread
(parameterize ((current-error-port err)
(current-output-port out))
(call-with-new-thread
(lambda ()
(let ((status
(status:exit-val
(apply system* command))))
(close-port err)
(close-port out)
status))))))
(let loop ()
(match (read-line in 'concat)
((? eof-object?)
(for-each
(lambda (port)
(false-if-exception (close-port port)))
(list err out in))
(join-thread thread))
(line
(proc line)
(loop))))))
(lambda (key . args)
(for-each
(lambda (port)
(false-if-exception (close-port port)))
(list err out in))
(apply throw key args)))))))
--8<---------------cut here---------------end--------------->8---
--=20
Ricardo
X-Loop: help-debbugs@HIDDEN
Subject: bug#43364: with-output-to-port works with file ports
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From: Ricardo Wurmus <rekado@HIDDEN>
Date: Fri, 08 Sep 2023 21:06:11 +0200
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Felix Lechner via "Bug reports for GUILE, GNU's Ubiquitous Extension Langua=
ge" <bug-guile@HIDDEN> writes:
> Hi,
>
> In an interesting (or perhaps maddening) inconsistency,
> 'with-output-to-port' captures stdout from system* here
>
> (call-with-output-file "/tmp/test.log"
> (lambda (port)
> (with-output-to-port
> port
> (lambda ()
> (system* "mktemp" "-d")))))
>
> but 'with-output-to-string' does not do so here
>
> (with-output-to-string
> (lambda ()
> (system* "mktemp" "-d")))
>
> According to lloda on #guile, system* handles the redirection only
> when the current ports are file ports. Thanks for that pointer!
That=E2=80=99s correct. I=E2=80=99ve been using the following monstrosity =
to capture
and process output. Perhaps someone finds a prettier way?
--8<---------------cut here---------------start------------->8---
(define* (call-with-output-processor command proc #:optional capture-stderr=
?)
"Silently execute COMMAND, a list of strings representing an
executable with its arguments, and apply PROC to every line printed to
standard output and, optionally when CAPTURE-STDERR? is #T, standard
error. Return the exit status of COMMAND."
;; We can only capture a program's standard error by parameterizing
;; current-error-port to a *file* port before using system* or
;; open-pipe*. The process will write its standard error stream to
;; the provided file descriptor. Meanwhile we read from the file
;; descriptor (blocking) for new lines until the process exits.
(match (socketpair PF_UNIX SOCK_STREAM 0)
((in . out)
(let ((err (if capture-stderr?
(dup out)
(%make-void-port "w"))))
(catch #true
(lambda ()
(let ((thread
(parameterize ((current-error-port err)
(current-output-port out))
(call-with-new-thread
(lambda ()
(let ((status
(status:exit-val
(apply system* command))))
(close-port err)
(close-port out)
status))))))
(let loop ()
(match (read-line in 'concat)
((? eof-object?)
(for-each
(lambda (port)
(false-if-exception (close-port port)))
(list err out in))
(join-thread thread))
(line
(proc line)
(loop))))))
(lambda (key . args)
(for-each
(lambda (port)
(false-if-exception (close-port port)))
(list err out in))
(apply throw key args)))))))
--8<---------------cut here---------------end--------------->8---
--=20
Ricardo
X-Loop: help-debbugs@HIDDEN
Subject: bug#43364: with-output-to-port works with file ports
References: <20200912225923.5fa9504e@HIDDEN>
Resent-From: Fabio Natali <me@HIDDEN>
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From: Fabio Natali <me@HIDDEN>
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Date: Tue, 23 Apr 2024 17:32:52 +0100
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Dear All =F0=9F=91=8B,
I've been encountering a few times the need for a procedure like
'system' or 'system*' but that might be capable of capturing the output
of the program that's being called.
While this is something that can be solved with a simple 'open-pipe*'
wrapper, the pattern seems relatively frequent in Guix, which is where I
noticed it. I suggested that some variant of such a wrapper could be
added to '(guix build utils)'=E2=81=B0.
In reply to my post, it was brought to my attention that the problem
might be addressed at the Guile level and pointed me to this bug report.
I thought of sending a quick follow-up here to see if there's any rough
consensus on a possible way of addressing this - or why it might be
difficult or potentially not worth the effort.
Thanks, all best, Fabio.
=E2=81=B0 https://lists.gnu.org/archive/html/guix-devel/2024-04/msg00199.ht=
ml
--=20
Fabio Natali
https://fabionatali.com
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.