* Program working with shell-command but not call-process
@ 2014-07-03 16:46 John Mastro
2014-07-03 22:51 ` Michael Heerdegen
0 siblings, 1 reply; 4+ messages in thread
From: John Mastro @ 2014-07-03 16:46 UTC (permalink / raw
To: help-gnu-emacs@gnu.org
Does anyone know what situation would result in this working:
(shell-command-to-string "git --version")
;=> it returns "git version 2.0.1"
But not this:
(with-output-to-string
(call-process "git" nil standard-output nil "--version"))
;=> it returns ""
;=> `call-process' alone returns 53
This git is built and installed from source on Cygwin. It works fine
from the shell but not via `call-process', which means it doesn't work
with `magit'.
It's in my path (both $PATH and `exec-path'), and `executable-find'
finds it without problem at c:/usr/local/bin/git.exe.
The git that's availablefor install via Cygwin (quite old, v1.7.9),
succeeds with both the calls above. It's still installed at
c:/bin/git.exe.
Thanks,
John
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Program working with shell-command but not call-process
2014-07-03 16:46 Program working with shell-command but not call-process John Mastro
@ 2014-07-03 22:51 ` Michael Heerdegen
0 siblings, 0 replies; 4+ messages in thread
From: Michael Heerdegen @ 2014-07-03 22:51 UTC (permalink / raw
To: help-gnu-emacs
John Mastro <john.b.mastro@gmail.com> writes:
> Does anyone know what situation would result in this working:
>
> (shell-command-to-string "git --version")
> ;=> it returns "git version 2.0.1"
>
> But not this:
>
> (with-output-to-string
> (call-process "git" nil standard-output nil "--version"))
> ;=> it returns ""
> ;=> `call-process' alone returns 53
Don't know anything about this, sorry. But considering the doc of
`call-process` - when you don't get a lisp error, Emacs found and
actually called git, and git exited with return value 53.
Dunno what makes the difference when you use a shell.
Michael.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Program working with shell-command but not call-process
[not found] <mailman.4812.1404406058.1147.help-gnu-emacs@gnu.org>
@ 2014-07-04 10:16 ` Joost Kremers
2014-07-04 15:21 ` Michael Heerdegen
0 siblings, 1 reply; 4+ messages in thread
From: Joost Kremers @ 2014-07-04 10:16 UTC (permalink / raw
To: help-gnu-emacs
John Mastro wrote:
> Does anyone know what situation would result in this working:
>
> (shell-command-to-string "git --version")
> ;=> it returns "git version 2.0.1"
>
> But not this:
>
> (with-output-to-string
> (call-process "git" nil standard-output nil "--version"))
> ;=> it returns ""
> ;=> `call-process' alone returns 53
`with-output-to-string' takes whatever is sent to `standard-output',
converts it to a string and returns it. `call-process' sends its output
to a buffer, or optionally to a file, but not to stdout. So you won't
get any output from this construct unless `standard-output' is set to a
buffer.
However, that is probably not the source of the problem you hint at (the
fact that magit doesn't work). That is most likely due to the fact that
`call-process' alone returns 53. If git were successful, it should
return 0.
--
Joost Kremers joostkremers@fastmail.fm
Selbst in die Unterwelt dringt durch Spalten Licht
EN:SiS(9)
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Program working with shell-command but not call-process
2014-07-04 10:16 ` Joost Kremers
@ 2014-07-04 15:21 ` Michael Heerdegen
0 siblings, 0 replies; 4+ messages in thread
From: Michael Heerdegen @ 2014-07-04 15:21 UTC (permalink / raw
To: help-gnu-emacs
Joost Kremers <joost.m.kremers@gmail.com> writes:
> > (with-output-to-string
> > (call-process "git" nil standard-output nil "--version"))
> > ;=> it returns ""
> > ;=> `call-process' alone returns 53
>
> `with-output-to-string' takes whatever is sent to `standard-output',
> converts it to a string and returns it. `call-process' sends its output
> to a buffer, or optionally to a file, but not to stdout. So you won't
> get any output from this construct unless `standard-output' is set to a
> buffer.
I don't think this is true. `with-output-to-string` binds
`standard-output` to a temporary buffer and returns its content, so the
above should work (and actually does work here).
Michael.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2014-07-04 15:21 UTC | newest]
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2014-07-03 16:46 Program working with shell-command but not call-process John Mastro
2014-07-03 22:51 ` Michael Heerdegen
[not found] <mailman.4812.1404406058.1147.help-gnu-emacs@gnu.org>
2014-07-04 10:16 ` Joost Kremers
2014-07-04 15:21 ` Michael Heerdegen
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