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20. March 2015

Remove duplicate mails from a maildir

Filed under: Linux,Server Administration — Tags: , , , , — Christopher Kramer @ 19:30

In case somehow, you got duplicate mails in a maildir, like me, maybe this is helpful to you:

find /var/mail/user -type d -name cur -print0 | xargs -0 /usr/bin/fdupes -n | less

Of course you need fdupes installed. On debian:

apt-get install fdupes

The above command is the dry run, showing you the duplicates.

Then to delete the duplicates, leaving only the first found file:

find /var/mail/user -type d -name cur -print0 | xargs -0 /usr/bin/fdupes -ndN | less

Use the same thing again with “new” instead of “cur” if you have duplicate unread mails. This only looks at duplicates within the same folder, so you can also safely run it on /var/mail for all users.

Note that this assumes the duplicates have exactly the same content. If you want to clean duplicates which are a bit different, consider this tool.

Update 2018: Three years later, I had the same problem, googled it and found my own blog post 😉 And it again solved the problem 🙂

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19. March 2015

Owncloud: Share-Button for calendar is missing

Filed under: Server Administration — Tags: , , , — Christopher Kramer @ 16:04

Searching the share-Button for the calendar in your owncloud webinterface?

I was searching it and finally found out that adblock was removing it! “Fanboy’s Social Blocking List” includes a rule “###.icon-share”, which also removes Ownclouds-Share button.

So best, just disable Adblock for your owncloud server.

Nextcloud: Share button for files is missing

Update 2019-08-08: It seems Nextcloud has a similar issue. Here, the share-buttons for sharing files is missing. So again, the best solution is to disable any adblocker for nextcloud.

14. March 2015

Bind nameserver: view cache entries

Filed under: Linux,Server Administration — Tags: , , , , — Christopher Kramer @ 15:35

If you want to view the cache entries of your bind nameserver, this is how it works on bind9 on Debian:

rndc dumpdb
less /var/cache/bind/named_dump.db

Tested on Debian Wheezy. Hope this helps somebody.

6. March 2015

Owncloud: Upgrading to owncloud 8 fails (Integrity constraint violation in oc_filecache)

Filed under: Linux,PHP,Server Administration — Tags: , — Christopher Kramer @ 21:33

First, the upgrade to owncloud 8 in the web GUI failed. Then, I performed the upgrade in the console like this:

sudo -u www-data php /var/www/owncloud/occ upgrade

This gave an error like this (I don’t remember exactly):

An exception occurred while executing 'INSERT INTO "oc_filecache" ... Integrity constraint violation: key s_storage_path_hash is not unique
...
Upgrade failed

This owncloud is using a MySQL DB.

So what in the end solved the problem: First put Owncloud in maintainance mode:

sudo -u www-data php /var/www/owncloud/occ maintenance:mode --on

Then make sure no occ processes of old upgrade attempts are running. If there are, kill them. Then clear the oc_filecache using this MySQL command:

TRUNCATE oc_filecache;

Don’t worry, it will populate itself again during the upgrade. Then restart the upgrade:

sudo -u www-data php /var/www/owncloud/occ upgrade

This might take a lot of time! Better run this on a screen (see screen tutorial if you don’t know how) so it does not stop when your SSH connection breaks.

TortoiseGit: Windows for pull, push etc. take 5 minutes to appear, commit does not work

Filed under: Windows — Tags: , , , , — Christopher Kramer @ 21:14

My TortoiseGit showed a strange behaviour: When I tried to push or pull, the window took exactly 5 minutes to appear. The commit window did not appear any more. Reinstalling TortoiseGit did not fix the issue. I used the git Bash as a workaround for some time until I found a fix: TortoiseGit was not able to write into its temp directory because the security settings (NTFS rights) were somehow messed up. For the C:\Users\MyUser\AppData\Local\Temp\TortoiseGit, I added my user with full access rights and everything is now working again :).

Hope this helps someone to fix this faster in case someone has the same issue.

Spamassasin: MISSING_SUBJECT in every mail even though mail has a subject

Filed under: Linux,Server Administration — Tags: , , , — Christopher Kramer @ 09:48

I noticed the MISSING_SUBJECT rule matched for every mail recently even though the mails contained a subject header. Finally I found this in the spamd.log:

warn: Possible unintended interpolation of @yahoo in string at /etc/spamassassin/local.cf, rule MY_SPAMMY_YAHOO, line 1.
warn: rules: failed to compile Mail::SpamAssassin::Plugin::Check::_head_tests_0_4, skipping:
warn:  (Global symbol "@yahoo" requires explicit package name at /etc/spamassassin/local.cf, rule MY_SPAMMY_YAHOO, line 1.)

The reason was a rule like this:

header          MY_SPAMMY_YAHOO        To =~ /myspammyaddress@yahoo.de/
score           MY_SPAMMY_YAHOO        3
describe        MY_SPAMMY_YAHOO        Mail to myspammyaddress@yahoo.de is mostly spam

Escaping the @ in the rule fixed the Problem:

header          MY_SPAMMY_YAHOO        To =~ /myspammyaddress\@yahoo.de/

Hope this helps someone to spot the error faster.

The problem is that spamassasin does not autolearn ham if the ham messages match the MISSING_SUBJECT rule. So an error like this basically not only breaks lots of tests but also autolearning of ham. So lesson learned: better always look at the spamd.log after creating a new rule, even if you think you know what you are doing 😉