delicious tips

URL to search for tags "search" and "android"

http://delicious.com/mydelcious_account/search+android

Solution: Ubuntu upgrade 9.04->9.10 recovery after USB keyboard and mouse lost during package reconfig interaction

This is the most elegant and satisfying fix I experience to avoid a potentially serious problem ...

During the upgrade process from Ubuntu Jaunty 9.04 to Karmic 9.10, The update-manager usually wants to interact with the user to configure packages. At some point during this process, my USB subsystem stopped working, and I could not interact with the dialogs via keyboard or mouse (tried, but PS/2 keyboard did not help. They are generally not hot pluggable). Perhaps one could reboot and resume the process, but this could also leave the system in a bad state. I could get ssh access no problem. Could I get control of the dialogs remotely?

The answer is NX, and the answer is a resounding YES!

I already had a NX server running on the box, so I merely had to follow this HOWTO to enable "desktop shadowing". After editing /usr/NX/etc/server.cfg, enabling Shadowing and restarting the NX server

$ /etc/init.d/nxserver restart

I was able to use the NX client to regain control of the update process. Viola!

For those of you who do not have NX installed already, here is a nice guide. One might have trouble installing the NX server with dpkg, as there would be a dpkg already running due to the upgrade process. In this case, one could install from source.

Another option would be to try and revive the USB subsystem, but this worked so quickly, I didn't need to go down that road.

Rendering code via pygments in your blog

Cofiguring your blog style sheet to include the pygments style by going to Customize->Layout->Edit HTML

Paste in before this line (for example):
/* Footer
----------------------------------------------- */
The following:

.hll { background-color: #ffffcc }
.c { color: #408080; font-style: italic } /* Comment */
.err { border: 1px solid #FF0000 } /* Error */
.k { color: #008000; font-weight: bold } /* Keyword */
.o { color: #666666 } /* Operator */
.cm { color: #408080; font-style: italic } /* Comment.Multiline */
.cp { color: #BC7A00 } /* Comment.Preproc */
.c1 { color: #408080; font-style: italic } /* Comment.Single */
.cs { color: #408080; font-style: italic } /* Comment.Special */
.gd { color: #A00000 } /* Generic.Deleted */
.ge { font-style: italic } /* Generic.Emph */
.gr { color: #FF0000 } /* Generic.Error */
.gh { color: #000080; font-weight: bold } /* Generic.Heading */
.gi { color: #00A000 } /* Generic.Inserted */
.go { color: #808080 } /* Generic.Output */
.gp { color: #000080; font-weight: bold } /* Generic.Prompt */
.gs { font-weight: bold } /* Generic.Strong */
.gu { color: #800080; font-weight: bold } /* Generic.Subheading */
.gt { color: #0040D0 } /* Generic.Traceback */
.kc { color: #008000; font-weight: bold } /* Keyword.Constant */
.kd { color: #008000; font-weight: bold } /* Keyword.Declaration */
.kn { color: #008000; font-weight: bold } /* Keyword.Namespace */
.kp { color: #008000 } /* Keyword.Pseudo */
.kr { color: #008000; font-weight: bold } /* Keyword.Reserved */
.kt { color: #B00040 } /* Keyword.Type */
.m { color: #666666 } /* Literal.Number */
.s { color: #BA2121 } /* Literal.String */
.na { color: #7D9029 } /* Name.Attribute */
.nb { color: #008000 } /* Name.Builtin */
.nc { color: #0000FF; font-weight: bold } /* Name.Class */
.no { color: #880000 } /* Name.Constant */
.nd { color: #AA22FF } /* Name.Decorator */
.ni { color: #999999; font-weight: bold } /* Name.Entity */
.ne { color: #D2413A; font-weight: bold } /* Name.Exception */
.nf { color: #0000FF } /* Name.Function */
.nl { color: #A0A000 } /* Name.Label */
.nn { color: #0000FF; font-weight: bold } /* Name.Namespace */
.nt { color: #008000; font-weight: bold } /* Name.Tag */
.nv { color: #19177C } /* Name.Variable */
.ow { color: #AA22FF; font-weight: bold } /* Operator.Word */
.w { color: #bbbbbb } /* Text.Whitespace */
.mf { color: #666666 } /* Literal.Number.Float */
.mh { color: #666666 } /* Literal.Number.Hex */
.mi { color: #666666 } /* Literal.Number.Integer */
.mo { color: #666666 } /* Literal.Number.Oct */
.sb { color: #BA2121 } /* Literal.String.Backtick */
.sc { color: #BA2121 } /* Literal.String.Char */
.sd { color: #BA2121; font-style: italic } /* Literal.String.Doc */
.s2 { color: #BA2121 } /* Literal.String.Double */
.se { color: #BB6622; font-weight: bold } /* Literal.String.Escape */
.sh { color: #BA2121 } /* Literal.String.Heredoc */
.si { color: #BB6688; font-weight: bold } /* Literal.String.Interpol */
.sx { color: #008000 } /* Literal.String.Other */
.sr { color: #BB6688 } /* Literal.String.Regex */
.s1 { color: #BA2121 } /* Literal.String.Single */
.ss { color: #19177C } /* Literal.String.Symbol */
.bp { color: #008000 } /* Name.Builtin.Pseudo */
.vc { color: #19177C } /* Name.Variable.Class */
.vg { color: #19177C } /* Name.Variable.Global */
.vi { color: #19177C } /* Name.Variable.Instance */
.il { color: #666666 } /* Literal.Number.Integer.Long */

/* end of pygments style sheet */

and save.
Then run your piece of code through pygemtize:
$ pygmentize -f html -o god_writes_good_code.html god_writes_good_code.py
Paste the html into the blog post. The preview will not show the colorization, but the blog view will.
Example:

import nltk
from nltk.corpus import PlaintextCorpusReader as PtCr

import numpy
import os


def cache_url(url, gunzip=True):
    """fetch the url locally if not already local.
    gunzip - {True,False} - pass through gunzip or not
    """

    filename = os.path.split(url)[-1]
    ext = os.path.splitext(url)[-1]

    # will we be unzipping?
    if gunzip and ext==".gz":
        unzipped = filename[:-3]
        if not os.path.exists(unzipped):
            err = os.system("gunzip -f %s" % filename)
            if err!=0:
                raise OSError, "gunzip error on file: %s" % filename
    
        return unzipped

Sesame on Tomcat on Ubuntu 9.10

First become root
$ sudo su

Now install JRE

# sudo apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts libservlet-2.5
# update-alternatives --config java

A few options pop up. I chose this one:

/usr/lib/jvm/java-6-sun/jre/bin/java

Now tomcat (according to this howto and summarized here)

# apt-get install tomcat6 tomcat6-admin tomcat6-common tomcat6-user tomcat6-docs tomcat6-examples

Try starting tomcat
# /etc/init.d/tomcat6 start
Try stopping
# /etc/init.d/tomcat6 stop
Restart an we're gonna play with it
# /etc/init.d/tomcat6 restart
Query readiness
# /etc/init.d/tomcat6 status
* Tomcat servlet engine is running with pid 3789

Point your browser to http://localhost:8080 and verify that tomcat is up and running.

Now install Sesame on tomcat as follows.

Download the sesame binary package from http://www.openrdf.org/download.jsp.

Extract it to some dir $SESAME

# cd /var/lib/tomcat6/webapps

Copy the .war files

# cp $SESAME/war/* .



# mkdir -p /usr/share/tomcat6/.aduna/openrdf-sesame/logs
# chown tomcat6:tomcat6 /usr/share/tomcat6/.aduna

Edit /etc/tomcat6/policy.d/50local.policy

and add this stuff:

// =============================================
// Additional permissions for openrdf-workbench
grant codeBase "file:${catalina.base}/webapps/openrdf-workbench/-" {
permission java.net.SocketPermission "localhost:8080", "connect";
permission java.net.SocketPermission "locahost:8080", "resolve";
};
//
// Additional permissions for openrdf-sesame
grant codeBase "file:${catalina.base}/webapps/openrdf-sesame/-" {
permission java.util.PropertyPermission "info.aduna.platform.appdata.basedir", "read";
permission java.util.PropertyPermission "aduna.platform.applicationdata.dir", "read";
permission java.util.PropertyPermission "user.home", "read";
//permission java.security.AllPermission;
permission java.lang.RuntimePermission "createSecurityManager";
permission java.util.logging.LoggingPermission "control";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/logs", "read";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/logs", "write";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/conf/logback.xml", "read";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/conf/proxy.properties", "read";
permission java.util.PropertyPermission "*", "read,write";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/conf", "read,write";

//permission java.io.FilePermission /usr/share/tomcat6/.aduna/openrdf-sesame/*", "read,write";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/conf/proxy.properties.default", "read,write";

permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/repositories/SYSTEM/memorystore.data", "read,write";

permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/repositories/SYSTEM/lock", "read,write";
permission java.io.FilePermission "/usr/share/tomcat6/.aduna/openrdf-sesame/-", "read,write,delete";

permission java.lang.RuntimePermission "shutdownHooks";
permission java.lang.RuntimePermission "getProtectionDomain";
permission java.lang.reflect.ReflectPermission "suppressAccessChecks";

};
// ===================================================



Create /etc/tomcat6/Catalina/localhost/openrdf-workbench.xml containing:





sudo /etc/init.d/tomcat6 restart



Visit:

http://localhost:8080/openrdf-workbench
http://localhost:8080/openrdf-sesame

to verify that no Java exceptions are thrown.

Tomcat admin:

emacs /etc/tomcat6/tomcat-users.xml
add user with manager role.

visit http://localhost:8080