Using Kerberos on Mac Os X 10.6 Snow Leopard

Problem:
I tried to use Kerberos authentication system out-of-the-box with my new Mac, and when I try to get a ticket I got this error:


$> kinit user@HOST.COM
$> kinit: Unable to acquire credentials for 'user@HOST.COM': Cannot resolve network address for KDC in realm HOST.COM

Solution:
So I googled a bit and I tried some recipes, but I just discovered that the order with configuration files are read by Kerberos changes sometimes. So instead of the conf file inside
~/Library/Preferences/edu.mit.Kerberos
I had to copy the same file to
/etc/krb5.conf

So create those two files with a content like this:


[realms]

HOST.COM = {
default_domain = host.com
kpasswd_server = afskrb5m.host.com
admin_server = afskrb5m.host.com
kdc = afsdb1.host.com
kdc = afsdb2.host.com
kdc = afsdb3.host.com
}

[domain_realm]
.host.com = HOST.COM



And you are done!
Then you can try using kinit to get a ticket like:


$> kinit user@HOST.COM Please enter the password for user@HOST.COM:

$> klist
Kerberos 5 ticket cache: 'API:Initial default ccache'
Default principal: user@HOST.COM
Valid Starting Expires Service Principal
05/04/10 15:28:11 05/05/10 01:28:11 krbtgt/HOST.COM@HOST.COM
$>


Note!
If you are looking information on how to access the CERN AFS from Mac Os X, you can find the settings for CERN here:
http://linux.web.cern.ch/linux/docs/kerberos-access.shtml

You can also look at this nice twiki about AFS at CERN with Mac Os X. But remember to edit the right config file in the right folder, otherwise Kerberos will complain.
https://e5wiki.physik.tu-dortmund.de/bin/view/Main/MacOSXCernKerberos

How to change or clear your Subversion password used by eclipse plugins on Mac OS X

I assume that you are using Eclipse Galileo on Mac Os X Snow Leopard, with JavaHL SVN client.

It happened to me that once I updated the password of my account on the subversion server machine, Eclipse did not allow me to connect to the repository anymore; moreover it did not ask me for a new password, I merely got errors like "The folder does not exists on remote server" and authentication errors on the Eclipse SVN Console.

After googleing for a while, I did not find the solution yet, and so I started to play around. Finally I solved the problem and I post the solution here; I hope it can save you some time :-)

You have to open the "Keychain" application from "Applications" --> "Utilities" --> "Keychain"

There you will find an "application password" related to SVN: mine contains something like "https://svn.host.com/". You double click on it and you change your stored password with the new one.

Now if you close Eclipse and then you open it again, it will notice that the SVN password was changed and when you will try to access the repository again, Eclipse will ask you the username/password couple again. You can type the new password again, and you can "save" it if you want. The new password is set.

Hope that helped! :-)

LaTeX: how to include a minted pygmentized piece of code in a figure environment, with three minipage in a row

Sometime we want to put two, three or more LaTeX objects side by side on one row. For example we want to put more figures one next to the other. Or we want to build complex figures gathering under one "figure" environment more objects like formatted text, images and highlighted source code using pygmentize and minted. Here below you will find a working example.
The same example is valid if we want to put fancy texts side by side like inside boxes, because the \fbox command does not allow to use complex-formatted text inside.

Here what you get




and here below the code to generate it.

ATTENTION!!!! Pay attenion to not insert empty lines in the source code between minipages!! Otherwise you will get the minipage environment put in a vertical column: because the empty lines will be evaluated as "new line" breaks. I say it here because I waisted some hours looking for this "bug"!!! ;-D :-P



\begin{figure}[h]
\centering
\begin{tabular}{c}
\begin{minipage}[c]{.40\linewidth}
\centering
\epsfig{file=ImagePlaceholder, scale = 2.0}
\end{minipage}
\begin{minipage}[c]{.10\linewidth}
\centering
\epsfig{file=RightArrow_Grey, scale=0.6}
\end{minipage}
\begin{minipage}[c]{.45\linewidth}
\begin{minted}[bgcolor=bg, fontsize=\tiny ]{python}
'3j0lep':{
'selectionCuts': {
'electron':{'deltaR_ej': 0.25}
}

'cuts': { 1: { 'label': 'Cut1',
'value': [20*Units.GeV]},
2: { 'label': 'Cut2',
'value': [100*Units.GeV,
40*Units.GeV,
40*Units.GeV],
},
3: { 'label': 'Cut3',
'value': 80*Units.GeV, },
},
}
\end{minted}
\end{minipage} \\
\\ %empty line for some space
\footnotesize
From requirements...
\hfill
...to the code!\\
\end{tabular}
\caption{Main caption.}
\label{MainILabel}
\end{figure}