Hello,
after announcing the promotion campaign for IPv6
Short statistic about the impact of IPv6 availability on the ports-tree
=======================================================================
At 2015-12-14 there were 25.522 ports in the ports-tree.
The files for this ports were fetched from 5.344 different hosts.
Different subdomains (example: sub1.domain.tld and sub2.domain.tld) are
considered as different hosts, because they normally are different server.
Of course a host can have multiple IPv4 and IPv6 addresses. If the DNS
lists at least one IPv6 address for the server, its stated there is IPv6
support. Same for IPv4.
When there is an IPv6 addresses i *assumed* IPv6 support. I did not
fetch files or check for wrong configuration. The real support could be
worse than stated.
Out of 5.344 hosts there are 3.925 hosts which have only an IPv4 address.
Out of 5.344 hosts there are 0 hosts which have only an IPv6 address.
Out of 5.344 hosts there are 359 hosts without resolvable DNS record.
(The affected ports are all broken)
1.419 out of 5.344 hosts support IPv4 and IPv6.
Therefore 73.44 % of the hosts did not support IPv6.
To check if a port is available for IPv6 i excluded the
distcache.freebsd.org host, because it is not part of the port. Its a
fallback provided by the FreeBSD project.
Out of 25.522 ports there are 10.308 which are not fetchable via IPv6,
rendering the ports unable to build.
This means that 40.38 % of the portstree are not buildable when having
an IPv6 only connection.
But this is not the end. Ports have dependencies. LibreOffice for
example is a big port with 277 dependencies at all. When building
LibreOffice every dependency must be available, otherwise it could not
be build. This means whenever a single port is not fetchable through
IPv6 every other port depending at it is also not buildable.
When iterating through our 25.522 ports and do a "make all-depends-list"
to get a list of all dependencies a single port has, we get a list of
1.696.351 dependencies. Now back to the remaining question "how many
ports are not buildable because of missing IPv6 support of their
distribution servers?".
Answer: 17.715.
In conclusion: if you having an IPv6 only machine, you could not build
69.4 % of the ports.
This includes major ports like Firefox and Thunderbird, because
releases.mozilla.org and ftp.mozilla.org does not support IPv6 - but
mozilla.org itself does.
It includes also for example LibreOffice because some dependencies are
not fetchable through IPv6.
And there is big number of Software which is not usable because
GitHub.org, Rubygems.org, pecl.php.net and pear.php.net does not have
IPv6 support. While the PHP related projects works on support, the other
ones closed multiple requests without any feedback.
These are the TOP 25 missing IPv6 hosts with the number of ports
rendered unfetchable by them (no dependencies included):
host | unfetchable_ports
----------------------------+-------------------
pypi.python.org | 2384
codeload.github.com | 1350
production.cf.rubygems.org | 1212
production.s3.rubygems.org | 1211
hackage.haskell.org | 484
vault.centos.org | 209
mirror.centos.org | 208
gstreamer.freedesktop.org | 157
pecl.php.net | 128
pear.horde.org | 119
ftp.mozilla.org | 117
mirror.amdmi3.ru | 106
github.com | 71
bitbucket.org | 58
download.gna.org | 58
launchpad.net | 50
launchpadlibrarian.net | 46
www.sourcefiles.org | 40
releases.mozilla.org | 39
cloud.github.com | 34
freebsd.unixfreunde.de | 33
people.freebsd.org | 31
www.python.org | 30
www.squirrelmail.org | 30
ftp.gnustep.org | 30
(25 Zeilen)
Next steps
==========
In the next step a number of volunteers will contact the different
projects and ask for IPv6 support. The reasons for the missing support a
various - unawareness, no experience, missing technical infrastructure, etc.
We will support the projects individually; answering questions or even
find a solution if there is no technical infrastructure for them.
Hopefully we can promote IPv6 much more and make the missing support to
an exception.
Greetings,
Torsten
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