Re: [PATCH v2] Documentation: fix build with Asciidoctor 2

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On Fri, Sep 13, 2019 at 01:52:40AM +0000, brian m. carlson wrote:

> We also need to teach xmlto how to use the namespaced DocBook XSLT
> stylesheets instead of the non-namespaced ones it usually uses.
> Normally these stylesheets are interchangeable, but the non-namespaced
> ones have a bug that causes them not to strip whitespace automatically
> from certain elements when namespaces are in use.  This results in
> additional whitespace at the beginning of list elements, which is
> jarring and unsightly.
> 
> We can do this by passing a custom stylesheet with the -x option that
> simply imports the namespaced stylesheets via a URL.  Any system with
> support for XML catalogs will automatically look this URL up and
> reference a local copy instead without us having to know where this
> local copy is located.  We know that anyone using xmlto will already
> have catalogs set up properly since the DocBook 4.5 DTD used during
> validation is also looked up via catalogs.  All major Linux
> distributions distribute the necessary stylesheets and have built-in
> catalog support, and Homebrew does as well, albeit with a requirement to
> set an environment variable to enable catalog support.
> 
> On the off chance that someone lacks support for catalogs, it is
> possible for xmlto (via xmllint) to download the stylesheets from the
> URLs in question, although this will likely perform poorly enough to
> attract attention.  People still have the option of using the prebuilt
> documentation that we ship, so happily this should not be an impediment.


> diff --git a/Documentation/Makefile b/Documentation/Makefile
> index 76f2ecfc1b..d94f47c5c9 100644
> --- a/Documentation/Makefile
> +++ b/Documentation/Makefile
> @@ -197,11 +197,13 @@ ifdef USE_ASCIIDOCTOR
>  ASCIIDOC = asciidoctor
>  ASCIIDOC_CONF =
>  ASCIIDOC_HTML = xhtml5
> -ASCIIDOC_DOCBOOK = docbook45
> +ASCIIDOC_DOCBOOK = docbook5
>  ASCIIDOC_EXTRA += -acompat-mode -atabsize=8
>  ASCIIDOC_EXTRA += -I. -rasciidoctor-extensions
>  ASCIIDOC_EXTRA += -alitdd='&\#x2d;&\#x2d;'
>  DBLATEX_COMMON =
> +XMLTO_EXTRA += --skip-validation
> +XMLTO_EXTRA += -x manpage.xsl
>  endif
>  
>  SHELL_PATH ?= $(SHELL)
> diff --git a/Documentation/manpage.xsl b/Documentation/manpage.xsl
> new file mode 100644
> index 0000000000..ef64bab17a
> --- /dev/null
> +++ b/Documentation/manpage.xsl
> @@ -0,0 +1,3 @@
> +<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; version="1.0">
> +	<xsl:import href="http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl"; />
> +</xsl:stylesheet>

Unfortunately, five out of five CI builds failed with the following:

      XMLTO git-revert.1
  I/O error : Attempt to load network entity http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl
  warning: failed to load external entity "http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl";
  compilation error: file /home/travis/build/git/git/Documentation/manpage.xsl line 2 element import
  xsl:import : unable to load http://docbook.sourceforge.net/release/xsl-ns/current/manpages/docbook.xsl
  Makefile:375: recipe for target 'git-revert.1' failed

https://travis-ci.org/git/git/jobs/584794387#L1552




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