[postgis-tickets] [PostGIS] #2792: docbook validation preventing regress when trying to access down docbook site

[PostGIS]

#2792: docbook validation preventing regress when trying to access down docbook
site
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  Reporter:  robe     |      Owner:  Algunenano
      Type:  defect   |     Status:  new
  Priority:  low      |  Milestone:  PostGIS 3.0.3
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by Algunenano):

 Changing to https didn't work because apparently xmllint does not support
 https, and that's why it's failing.

 In my system, what xmllint does is it tries to open `https://www.oasis-
 open.org/docbook/xml/4.5/docbookx.dtd` as a file, which obviously fails.
 Then it explores the local environment: `/etc/xml/catalog` -> `/etc/xml
 /docbook-xml` which leads to `/usr/share/xml/docbook/xml-
 dtd-4.5/docbookx.dtd` which works.

 So, AFAICS right now, I think that the only way of being able to pass this
 is to have docbook-xml installed in your local system as the remote url
 will always fail, but I'm not sure when this started happening. It was
 fine a few days ago but not yesterday, so it's likely that www.oasis-
 open.org decided to start redirecting http -> https.

 There are several solutions to this problem:
 - Install docbook-xml in the docker images, which is what I'm planning to
 do for now.
 - Vendor in the necessary files.
 - Remove docbook and use something else.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/2792#comment:13>
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