Change 440857 had a related patch set uploaded (by WMDE-Fisch; owner: WMDE-Fisch):
[mediawiki/extensions/FileImporter@master] Add a temp config to allow interwiki linking

https://gerrit.wikimedia.org/r/440857

Change 440860 had a related patch set uploaded (by WMDE-Fisch; owner: WMDE-Fisch):
[operations/mediawiki-config@master] Add ar, de and fa wikipedia to FileImporter interwiki config

https://gerrit.wikimedia.org/r/440860

We collected three possible solutions:

1. https://gerrit.wikimedia.org/r/440857 implements a simple "global wiki ID to interwiki prefix" map, e.g. "dewiki" => "w:de". This is meant to be temporary, because it repeats configuration from somewhere else, is limited to be used on Commons, and is not maintainable in the long run.
2. We explored the idea to build 2-level interwiki prefixes from what we know about the wiki group (e.g. dewiki is in the Wikipedia group, and the one prefix we know from this group is w:) plus the language code, resulting in w:de:. Problem: There are to many exceptions. We would still need to repeat some configuration (at least the groups, as well as one or more blacklists of language codes), ending with the same problems with long-time maintainability.
3. Use a proper interwiki lookup.
   • Resolving one level (e.g. mw:) is not hard.
   • When we need to resolve an other level, we can either use the interwikimap API, or direct access to the global interwiki configuration, if available.

Closer investigation:

• I had a look at the dumpInterwiki.php script from the MediaWiki-extensions-WikimediaMaintenance. It's not helpful. It does read all information from text files, but never connects to a database.
• The interwikimap API seems the way to go. This is especially relevant when we don't have direct access to other wikis databases.
• The API uses MediaWikiServices::getInstance()->getInterwikiLookup() internally. We can access this directly in our setup.

The interwikimap API seems the way to go. This is especially relevant when we don't have direct access to other wikis databases.

When doing this I guess it would be really nice to implement that "reverse" lookup in core. It can be quite useful for other projects as well and shouldn't be to hard.

Change 440857 merged by jenkins-bot:
[mediawiki/extensions/FileImporter@master] Add a temp config to allow interwiki linking

https://gerrit.wikimedia.org/r/440857

Change 441009 had a related patch set uploaded (by WMDE-Fisch; owner: WMDE-Fisch):
[mediawiki/extensions/FileImporter@wmf/1.32.0-wmf.8] Add a temp config to allow interwiki linking

https://gerrit.wikimedia.org/r/441009

Change 441061 had a related patch set uploaded (by WMDE-Fisch; owner: WMDE-Fisch):
[mediawiki/extensions/FileImporter@master] Get prefixes from direct matches in the interwiki table

https://gerrit.wikimedia.org/r/441061

Just for the record here and especially for @Lea_WMDE : A first version of this is implemented with a configurable Whitelist that allows interwiki prefixes for the wikis we aim for at the moment. On the long run this should be replaced by an automated lookup.

Change 441061 merged by jenkins-bot:
[mediawiki/extensions/FileImporter@master] Get prefixes from direct matches in the interwiki table

https://gerrit.wikimedia.org/r/441061

Change 441197 had a related patch set uploaded (by Thiemo Kreuz (WMDE); owner: Thiemo Kreuz (WMDE)):
[mediawiki/extensions/FileImporter@master] Let InterwikiTablePrefixLookup reject ambiguous hosts

https://gerrit.wikimedia.org/r/441197

Change 441197 merged by jenkins-bot:
[mediawiki/extensions/FileImporter@master] Let InterwikiTablePrefixLookup reject ambiguous hosts

https://gerrit.wikimedia.org/r/441197

Change 441871 had a related patch set uploaded (by Addshore; owner: WMDE-Fisch):
[mediawiki/extensions/FileImporter@wmf/1.32.0-wmf.999] Add a temp config to allow interwiki linking

https://gerrit.wikimedia.org/r/441871

Change 440860 merged by jenkins-bot:
[operations/mediawiki-config@master] Add ar, de and fa wikipedia to FileImporter interwiki config

https://gerrit.wikimedia.org/r/440860

Mentioned in SAL (#wikimedia-operations) [2018-06-25T14:19:15Z] <addshore@deploy1001> Synchronized wmf-config/CommonSettings.php: [[gerrit:440860|Add ar, de and fa wikipedia to FileImporter interwiki config]] T196969 T196976 (duration: 00m 56s)

Change 441009 merged by jenkins-bot:
[mediawiki/extensions/FileImporter@wmf/1.32.0-wmf.8] Add a temp config to allow interwiki linking

https://gerrit.wikimedia.org/r/441009

Change 441871 merged by jenkins-bot:
[mediawiki/extensions/FileImporter@wmf/1.32.0-wmf.999] Add a temp config to allow interwiki linking

https://gerrit.wikimedia.org/r/441871

Mentioned in SAL (#wikimedia-operations) [2018-06-25T14:30:59Z] <addshore@deploy1001> Synchronized php-1.32.0-wmf.999/extensions/FileImporter: [[gerrit:441871|Add a temp config to allow interwiki linking]] T196976 (duration: 00m 58s)

Mentioned in SAL (#wikimedia-operations) [2018-06-25T14:32:22Z] <addshore@deploy1001> Synchronized php-1.32.0-wmf.8/extensions/FileImporter: [[gerrit:441009|Add a temp config to allow interwiki linking]] T196976 (duration: 00m 57s)