linux-kernel - Re: [PATCH] DocBook: Avoid stdout junk with no man pages to compress

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Date:	Sun, 12 Jul 2015 16:36:53 -0700
From:	Jim Davis <jim.epost@...il.com>
To:	Ulf Magnusson <ulfalizer.lkml@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-doc <linux-doc@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	Jonathan Corbet <corbet@....net>,
	Herbert Xu <herbert@...dor.apana.org.au>, smueller@...onox.de,
	Ulf Magnusson <ulfalizer@...il.com>
Subject: Re: [PATCH] DocBook: Avoid stdout junk with no man pages to compress

On Sun, Jul 12, 2015 at 2:59 PM, Ulf Magnusson <ulfalizer.lkml@...il.com> wrote:
> gzip would run as 'gzip -f' when no uncompressed man pages were found,
> making it compress the (empty) stdin to stdout.

> --- a/Documentation/DocBook/Makefile
> +++ b/Documentation/DocBook/Makefile
> @@ -56,7 +56,7 @@ htmldocs: $(HTML)
>
>  MAN := $(patsubst %.xml, %.9, $(BOOKS))
>  mandocs: $(MAN)
> -       find $(obj)/man -name '*.9' | xargs gzip -f
> +       find $(obj)/man -name '*.9' -exec gzip -f {} \;
>
>  installmandocs: mandocs
>         mkdir -p /usr/local/man/man9/

That does get rid of the binary burp, but 'xargs gzip -f'  has been in
the Makefile since January, and gzipping '\n' just started recently.
So what's changed?

It looks like, for whatever reason, make installmandocs always ends up
rerunning mandocs -- there's now a 'GEN  Documentation
Docbook//v4l2.xml' printed, and that extra mandocs invocation is where
the problematic second invocation of find is coming from.  I won't
pretend to understand the Makefile flow to guess at why that's
happening, but obviously 'make mandocs; make installmandocs' shouldn't
need to regenerate things already generated.

In any event,

Tested-by: Jim Davis <jim.epost@...il.com>

Jim
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