Description of problem:
I updated my machine last night and my wiki page is blank.
Running mw-updateallinstances reports the following:
# mw-updateallinstances 
cp: cannot stat `/usr/share/mediawiki/config': No such file or directory
A copy of your installation's LocalSettings.php
must exist and be readable in the source directory.
Use --conf to specify it.

Indeed, if I ls /usr/share/mediawiki, the config directory does not exist. There is, however, a /usr/share/mediawiki/mw-config. Modifying mw-createinstance to point at that instead eliminates the cp error.

However, I still get the error from the php command.

If I manually run this from my mediawiki instance, I get this:
MediaWiki 1.19.4 Updater

Going to run database updates for wikidb-wiki_
Depending on the size of your database this may take a while!
...have ipb_id field in ipblocks table.
...have ipb_expiry field in ipblocks table.
...already have interwiki table
...indexes seem up to 20031107 standards.
...hitcounter table already exists.
...have rc_type field in recentchanges table.
...have user_real_name field in user table.
...querycache table already exists.
...objectcache table already exists.
...categorylinks table already exists.
...have pagelinks; skipping old links table updates
...il_from OK
...have rc_ip field in recentchanges table.
...index PRIMARY already set on image table.
...have rc_id field in recentchanges table.
...have rc_patrolled field in recentchanges table.
...logging table already exists.
...have user_token field in user table.
...have wl_notificationtimestamp field in watchlist table.
...watchlist talk page rows already present.
...user table does not contain user_emailauthenticationtimestamp field.
...page table already exists.
...have log_params field in logging table.
...logging table has correct log_title encoding.
...have ar_rev_id field in archive table.
...have page_len field in page table.
...revision table does not contain inverse_timestamp field.
...have rev_text_id field in revision table.
...have rev_deleted field in revision table.
...have img_width field in image table.
...have img_metadata field in image table.
...have user_email_token field in user table.
...have ar_text_id field in archive table.
A database query syntax error has occurred.
The last attempted database query was:
"SHOW COLUMNS FROM `wiki_page` LIKE 'page_namespace'"
from within function "MysqlUpdater::doNamespaceSize".
Database returned error "1: Can't create/write to file '/tmp/#sql_4b83_0.MYI' (Errcode: 2) (localhost)"

If I try to manually do a mysqldump I get the same error as at the end.

Version-Release number of selected component (if applicable):
mediawiki-1.19.4-2.fc17.noarch

How reproducible:
100%

Steps to Reproduce:
See above
 
Actual results:
Wiki doesn't work.

Expected results:
Working wiki.

Additional info: