Re: [ptxdist] git ptx-patches fails

[Alexander Stein <alexander.stein@systec-electronic.com>]

Hello Uwe,

On Tuesday 01 April 2014 11:37:30, Uwe Kleine-König wrote:
> On Tue, Apr 01, 2014 at 11:24:52AM +0200, Alexander Stein wrote:
> > On Tuesday 01 April 2014 10:24:41, Uwe Kleine-König wrote:
> > > On Mon, Mar 31, 2014 at 07:08:53PM +0200, Alexander Stein wrote:
> > > > On Saturday 29 March 2014, 10:28:54 wrote Michael Olbrich:
> > > > > On Thu, Mar 27, 2014 at 08:16:15AM +0100, Alexander Stein wrote:
> > > > > > I tried to use git ptx-patches fromwithin a package and noticed it doesn't work.
> > > > > > I could track down the problem to this command (from scripts/git-ptx-patches):
> > > > > > > man git-format-patch | grep -q -e --notes
> > > > > > 
> > > > > > Executing this command manually results in this error message:
> > > > > > > Error executing formatting or display command.
> > > > > > > System command (cd "/usr/share/man" && (echo ".pl 11i"; /bin/bzip2 -c -d '/usr/share/man/man1/git-format-patch.1.bz2') | /usr/bin/gtbl | /usr/bin/nroff -mandoc | less) exited with status 141.
> > > > > > > No manual entry for git-format-patch
> > > > > > 
> > > > > > Interestingly executing
> > > > > > > (cd "/usr/share/man" && (echo ".pl 11i"; /bin/bzip2 -c -d '/usr/share/man/man1/git-format-patch.1.bz2') | /usr/bin/gtbl | /usr/bin/nroff -mandoc | less) | grep -q -e --notes
> > > > > > works as expected. I have no idea what's wrong here.
> > > > > 
> > > > > Maybe this is caused by some aliases or interactive/non-ineractive magic.
> > > > > Does it help to replace "man git-format-patch" with "git format-patch
> > > > > --help" or "man -P cat git-format-patch"?
> > > > 
> > > > Unfortunately no :(
> > > > 
> > > > git format-patch --help | grep -q -e --notes
> > > > Error executing formatting or display command.
> > > > System command (cd "/usr/share/man" && (echo ".pl 11i"; /bin/bzip2 -c -d '/usr/share/man/man1/git-format-patch.1.bz2') | /usr/bin/gtbl | /usr/bin/nroff -mandoc | /usr/bin/less) exited with status 141.
> > > > No manual entry for git-format-patch
> > > > 
> > > > $ man -P cat git-format-patch | grep -q -e --notes
> > > > Error executing formatting or display command.
> > > > System command (cd "/usr/share/man" && (echo ".pl 11i"; /bin/bzip2 -c -d '/usr/share/man/man1/git-format-patch.1.bz2') | /usr/bin/gtbl | /usr/bin/nroff -mandoc | cat) exited with status 141.
> > > > No manual entry for git-format-patch
> > > Do you have git-format-patch's manpage, i.e. does
> > > 
> > > 	man git-format-patch
> > > 
> > > work?
> > 
> > Yep, that man page is installed.
> > 
> > > On bash, what happens on:
> > > 
> > > 	$ man -P cat git-format-patch | grep -q -e --notes
> > > 	$ echo ${PIPESTATUS[@]}
> > 
> > $ man -P cat git-format-patch | grep -q -e --notes
> > Error executing formatting or display command.
> > System command (cd "/usr/share/man" && (echo ".pl 11i"; /bin/bzip2 -c -d '/usr/share/man/man1/git-format-patch.1.bz2') | /usr/bin/gtbl | /usr/bin/nroff -mandoc | cat) exited with status 141.
> > No manual entry for git-format-patch
> > $ echo ${PIPESTATUS[@]}
> > 1 0
> > 
> > > Does
> > > 
> > > 	strace -f -o /tmp/lala man -P cat git-format-patch | grep -q -e --notes
> > > 
> > > give any insights (e.g. where does the 141 come from?)
> > 
> > Somewhat. The 'culprit' is grep so far:
> > $ man -P cat git-format-patch | grep -q -e --notes
> > Error executing formatting or display command.
> > System command (cd "/usr/share/man" && (echo ".pl 11i"; /bin/bzip2 -c -d '/usr/share/man/man1/git-format-patch.1.bz2') | /usr/bin/gtbl | /usr/bin/nroff -mandoc | cat) exited with status 141.
> > No manual entry for git-format-patch
> > $ man -P cat git-format-patch | grep -e --notes
> >                           [--[no-]cover-letter] [--quiet] [--notes[=<ref>]]
> >        --notes[=<ref>]
> > 
> > It seems grep slightly behaves differently when used with -q. It closes STDIN as soon as it detects the pattern.
> > But the closed pipe results in an EPIPE returned from write(2) within cat which exits with an error.
> My man (from the Debian package man-db 2.6.2-1) doesn't show this
> behaviour. Is your version older or newer?

I don't think this is related to man (what's man-db BTW?) at all.
I think the versions of cat and grep behave differently. I have installed grep-2.16 and coreutils-8.21 (current Gentoo stable versions).

Best regards,
Alexander
-- 
Dipl.-Inf. Alexander Stein

SYS TEC electronic GmbH
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