Tuesday, December 31, 2013

Hard Link Directories in OSX

Ever had one of those days when things that worked fine just don't anymore?

Today, for some reason I have yet to discover, my soft linked directories (created with ln -s <SOURCE> <TARGET>) became unsearchable by the bash find command.

I had to resort to creating a C program, in order to use it's link function.

SOURCE


#include <unistd.h>
#include <stdio.h>
#include <string.h>
/*
Purpose:  To create a hard link to a directory
Install:  gcc hln.c -o hln
*/
int main(int argc, char* argv[]) {
    //Make sure we have the right arguments
    if (argc != 3) {
        fprintf(stderr,"Usage:   hln <SOURCE_DIRECTORY> <TARGET_DIRECTORY>\n\n");
        fprintf(stderr,"To later unlink target directory:   hln -u <TARGET_DIRECTORY>\n");
        return 1;
    }
    int ret = 0;
    if(strcmp(argv[1], "-u") == 0)
        ret = unlink(argv[2]);
    else
        ret = link(argv[1],argv[2]);
         
    if (ret != 0)
        perror("hardlink");
    return ret;
}

Compile it

After compiling, you'll want to copy the hln executable to a suitable directory, like /usr/bin.

$ gcc hln.c -o hln

All good

Now, I can create (hard) linked directories and unlink them (with the -u option).

Posted by at 2 comments:

Thursday, December 12, 2013

Displaying Escaped Characters Better with Back References

Have you ever received strings with literal characters, like the one below, that just look like a lot of noise?

Start with this


"body"=>"\"{\\\"class\\\":\\\"MigrationMgr\\\",\\\"args\\\":[null,\\\"migrate_product\\\",1,3]}\""

A little better

Open up an IRB or Ruby command console and when you use puts, it looks a little better... 

[1] pry(main)> s=< "\"\"{\\\"class\\\":\\\"MigrationMgr\\\",\\\"args\\\":[null,\\\"migrate_product\\\",1,3]}\"\"\n"
[2] pry(main)> puts s
""{\"class\":\"MigrationMgr\",\"args\":[null,\"migrate_product\",1,3]}""
But it's still not as clean as you'd like.

Back References to the Rescue

First, create the back references 

back_refs = {
   '\"' => '',
   "\\" => ''''
}


Next, use gsub and regex groupings to replace the back references with the desired, simpler characters. 

hash_var['body'].gsub(/([\"\\])/) { back_refs[$1] }.gsub(',', ', ')

Result

Now, we have nicely formatted data that we can use for display purposes. 

{class:MigrationMgr, args:[null, migrate_product, 1, 3]}
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Wednesday, December 4, 2013

Upgrade from PostgreSQL 9.2.4 to 9.3.1 on OSX 10.9 and Centos 6.5

While testing a new async infrastructure, which requires more than 20 database connections, I ran out of connections and looked into upgrading PostgreSQL. The default setting for max_connections (found in /usr/local/var/postgres/postgresql.conf) is 100.

Ends up the upgrade from 9.2.4 to 9.3.1 is worthwhile for me since it greatly reduces System V shared memory requirements.

The upgrade was not time consuming, but required attention to details.

Here's what worked for me on OSX 10.9


$ brew upgrade postgresql

Keep Install Notes


==> Upgrading 1 outdated package, with result:
postgresql 9.3.1
==> Upgrading postgresql
==> Downloading http://ftp.postgresql.org/pub/source/v9.3.1/postgresql-9.3.1.tar.bz2
######################################################################## 100.0%
==> Patching
patching file contrib/uuid-ossp/uuid-ossp.c
==> ./configure --prefix=/usr/local/Cellar/postgresql/9.3.1 --datadir=/usr/local/Cellar/postgresql/9.3.1/share/postgresql --docdir=/usr/local/Cellar/postgresql/9.3.1/share/doc/postgresql --enable-thread-safety --with-bonjour --with-gssapi --with-krb5 --with-ldap --wi
==> make install-world
==> Caveats
initdb /usr/local/var/postgres -E utf8    # create a database cluster
postgres -D /usr/local/var/postgres       # serve that database
PGDATA=/usr/local/var/postgres postgres   # …alternatively

If builds of PostgreSQL 9 are failing and you have version 8.x installed,
you may need to remove the previous version first. See:
  https://github.com/mxcl/homebrew/issues/issue/2510

To migrate existing data from a previous major version (pre-9.3) of PostgreSQL, see:
  http://www.postgresql.org/docs/9.3/static/upgrading.html

When installing the postgres gem, including ARCHFLAGS is recommended:
  ARCHFLAGS="-arch x86_64" gem install pg

To install gems without sudo, see the Homebrew wiki.

To have launchd start postgresql at login:
    ln -sfv /usr/local/opt/postgresql/*.plist ~/Library/LaunchAgents
Then to load postgresql now:
    launchctl load ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
Or, if you don't want/need launchctl, you can just run:
    pg_ctl -D /usr/local/var/postgres -l /usr/local/var/postgres/server.log start
==> Summary
🍺  /usr/local/Cellar/postgresql/9.3.1: 2919 files, 39M, built in 78 seconds


Initialize new 9.3 database


$ cd /usr/local/var
$ mkdir postgres9.3
$ initdb /usr/local/var/postgres9.3 -E utf8

Migrate Data to New 9.3 Format


$ pg_upgrade \
-d /usr/local/var/postgres \
-D /usr/local/var/postgres9.3 \
-b /usr/local/Cellar/postgresql/9.2.4/bin/ \
-B /usr/local/Cellar/postgresql/9.3.1/bin/ \
-v

Create Link to Generic PostgreSQL directory


$ mv postgres postgres9.2.4
$ ln -s /usr/local/var/postgres9.3 /usr/local/var/postgres
$ psql postgres -c "select version()"

Increase System Memory for PostgreSQL


$ sudo sysctl -w kern.sysv.shmall=65536
$ sudo sysctl -w kern.sysv.shmmax=16777216

Create /etc/sysctl.conf file with following values


kern.sysv.shmall=65536
kern.sysv.shmmax=16777216

Reboot computer

Create postgres user


createuser -s -r postgres

Start postgreSQL

Note: I don't use launchd 

$ pg_ctl -D /usr/local/var/postgres -l $PGDATA/server.log start

Verify PostgreSQL 9.3 Works


$ psql postgres -c "select version()"

Vacuum db


$ vacuumdb --all

Reinstall PG gem

Note: Uninstall the gem on the system command line and let Bundle Install reinstall your project's required version, which for me was version 0.17. 

$ gem uninstall pg




$ cd <RAILS_PROJECT_DIR>

Possible Error

If you get the following... 


Building native extensions. This could take a while... ERROR: Error installing pg:

ERROR: Failed to build gem native extension.


...then run the following after uninstalling the pg gem: 


$ brew install apple-gcc42
$ gcc --version


A typical OSX DevTools install won't be enough, but you can run it anyway: 

xcode-select --install

Install Command Line Tools (OS X Mavericks)

If you use PostgreSQL.App, you'll need to install Command Line Tools (OS X Mavericks) for Xcode - Late October 2013

Do the following:
  • $ gem uninstall pg
  • $ xcode
  • From Xcode menu: Xcode > Open Developer Tool > More Developer Tools... > Choose "Command Line Tools (OS X Mavericks) for Xcode - Late October 2013"
  • Run the installation program
  • $ gem install pg

Update following in Gemfile


gem 'pg', '~> 0.17'

Bundle Install


$ bundle package --all


Verify PostgreSQL 9.3 works with Rails

Change directory to your favorite Rails project open the Rails Console and do some ActiveRecord queries.

Cleanup


$ brew cleanup postgresql
$ rm -rf /usr/local/var/postgres9.2.4

Notes

  • Since directories have been moved and linked, do not run delete_old_cluster.sh
  • When tweaking system memory setting, keep in mind that SHMMAX must be an exact multiple of 4096
  • Special thanks to Matt Brictson, referenced below
  • This update will likely break your PostgreSQL admin tool like pgadmin
  • The pg_upgrade application only migrates the public schema.
  • Upgrade to lastest (v1.18.1) pgAdmin app, but backup your data first.
  • Do not remove the old version (9.2.4) until you are certain that all data has been migrated successfully.

Centos Install

This is still a work in progress... 

$ su -
# cd softwares
# curl -O http://yum.postgresql.org/9.3/redhat/rhel-6-x86_64/pgdg-centos93-9.3-1.noarch.rpm
# rpm -ivh pgdg-centos93-9.3-1.noarch.rpm
# yum install postgresql93 postgresql93-server postgresql93-contrib
# service postgresql-9.3 initdb
# chkconfig postgresql-9.3 on
# yum erase postgresql92*
# reboot

References

http://blog.55minutes.com/2013/09/postgresql-93-brew-upgrade http://www.postgresql.org/docs/current/static/release-9-3.html http://www.postgresql.org/docs/8.4/static/kernel-resources.html http://wiki.postgresql.org/wiki/Tuning_Your_PostgreSQL_Server http://postgresapp.com http://www.pgadmin.org/download/macosx.php
Posted by at 5 comments:

Tuesday, November 12, 2013

Create Graphs with Ruby, CSS and HTML

My high schooler had a homework lab assignment that required creating graphs.

She asked if I could help her by creating a nice looking graph to put in her composition lab book.

I thought, why not? ...and why not use some Ruby, CSS and HTML to make it happen?

Here's one of the graphs

CM
RAIN		 TEMP
°C
36 36
34 32
32 28
30 24
28 20
26 16
24 12
22 8
20 4
18 0
16 -4
14 -8
12 -12
10 -16
8 -20
6 -24
4 -28
2 -32
0 -36


























Since I prefer to save trees I decided to fit 4 per page (see Final Results below).

Next year, when my soon-to-be high schooler asks me for help with the same lab, I'll refer her to this post :-)

Perhaps, it will help somebody else... The source can easily be modified to create a lot similar kinds of graphs.

Enjoy!

Ruby code for calculating labels

 ary2 = 36.downto(0).select{|n| 0 == n % 2 }  
 ary4 = 36.downto(-36).select{|n| 0 == n % 4 }  
 (0..ary2.size - 1).each {|i| puts "<tr> <td>#{ary2[i]}</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td>#{ary4[i]}</td> </tr>"}

HTML Source

This is one time that it was just easier to copy and paste... 
 <html>  
 <head>  
   <style type="text/css">  
    table,th, td  
    {  
      border: 1px solid black;  
      margin: 0;  
      padding: 0;  
    }  
    table {  
      border-spacing: 0;  
      border-collapse: collapse;  
      border: 0px;  
    }  
    tr {  
      height: 20px;  
    }  
    td {  
      width: 10px;  
      text-align: right;  
      padding-right: 10px;  
    }  
    .first-col {  
      width: 70px;  
      text-align: right;  
      border: 0px;  
      padding-right: 20px;  
    }  
    .last-col {  
      border: 0px;  
    }  
    #header-row td {  
      border: 0px;  
    }  
    #header-row .label {  
      position: relative;  
      left: 4px;  
    }  
    #row1-col1 {  
      float: left;  
      margin-bottom: 40px;  
    }  
    #row1-col2 {  
      float: left;  
      margin-bottom: 40px;  
    }  
    #row2-col1 {  
      float: left  
    }  
    #row2-col2 {  
      float: left  
    }  
   </style>  
 </head>  
 <body>  
   
   
 <div id="row1-col1">  
   <table>  
    <tr id="header-row">  
      <td>CM<br>RAIN</td> <td colspan="12"></td> <td class="label">TEMP<br>&deg;C</td>  
    </tr>  
    <tr> <td class="first-col">36</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">36</td> </tr>  
    <tr> <td class="first-col">34</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">32</td> </tr>  
    <tr> <td class="first-col">32</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">28</td> </tr>  
    <tr> <td class="first-col">30</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">24</td> </tr>  
    <tr> <td class="first-col">28</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">20</td> </tr>  
    <tr> <td class="first-col">26</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">16</td> </tr>  
    <tr> <td class="first-col">24</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">12</td> </tr>  
    <tr> <td class="first-col">22</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">8</td> </tr>  
    <tr> <td class="first-col">20</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">4</td> </tr>  
    <tr> <td class="first-col">18</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">0</td> </tr>  
    <tr> <td class="first-col">16</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-4</td> </tr>  
    <tr> <td class="first-col">14</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-8</td> </tr>  
    <tr> <td class="first-col">12</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-12</td> </tr>  
    <tr> <td class="first-col">10</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-16</td> </tr>  
    <tr> <td class="first-col">8</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-20</td> </tr>  
    <tr> <td class="first-col">6</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-24</td> </tr>  
    <tr> <td class="first-col">4</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-28</td> </tr>  
    <tr> <td class="first-col">2</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-32</td> </tr>  
    <tr> <td class="first-col">0</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-36</td> </tr>  
   </table>  
 </div>  
   
   
 <div id="row1-col2">  
   <table>  
    <tr id="header-row">  
      <td>CM<br>RAIN</td> <td colspan="12"></td> <td class="label">TEMP<br>&deg;C</td>  
    </tr>  
    <tr> <td class="first-col">36</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">36</td> </tr>  
    <tr> <td class="first-col">34</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">32</td> </tr>  
    <tr> <td class="first-col">32</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">28</td> </tr>  
    <tr> <td class="first-col">30</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">24</td> </tr>  
    <tr> <td class="first-col">28</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">20</td> </tr>  
    <tr> <td class="first-col">26</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">16</td> </tr>  
    <tr> <td class="first-col">24</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">12</td> </tr>  
    <tr> <td class="first-col">22</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">8</td> </tr>  
    <tr> <td class="first-col">20</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">4</td> </tr>  
    <tr> <td class="first-col">18</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">0</td> </tr>  
    <tr> <td class="first-col">16</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-4</td> </tr>  
    <tr> <td class="first-col">14</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-8</td> </tr>  
    <tr> <td class="first-col">12</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-12</td> </tr>  
    <tr> <td class="first-col">10</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-16</td> </tr>  
    <tr> <td class="first-col">8</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-20</td> </tr>  
    <tr> <td class="first-col">6</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-24</td> </tr>  
    <tr> <td class="first-col">4</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-28</td> </tr>  
    <tr> <td class="first-col">2</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-32</td> </tr>  
    <tr> <td class="first-col">0</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-36</td> </tr>  
   </table>  
 </div>  
   
 <br>  
 <div id="row2-col1">  
   <table>  
    <tr id="header-row">  
      <td>CM<br>RAIN</td> <td colspan="12"></td> <td class="label">TEMP<br>&deg;C</td>  
    </tr>  
    <tr> <td class="first-col">36</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">36</td> </tr>  
    <tr> <td class="first-col">34</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">32</td> </tr>  
    <tr> <td class="first-col">32</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">28</td> </tr>  
    <tr> <td class="first-col">30</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">24</td> </tr>  
    <tr> <td class="first-col">28</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">20</td> </tr>  
    <tr> <td class="first-col">26</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">16</td> </tr>  
    <tr> <td class="first-col">24</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">12</td> </tr>  
    <tr> <td class="first-col">22</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">8</td> </tr>  
    <tr> <td class="first-col">20</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">4</td> </tr>  
    <tr> <td class="first-col">18</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">0</td> </tr>  
    <tr> <td class="first-col">16</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-4</td> </tr>  
    <tr> <td class="first-col">14</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-8</td> </tr>  
    <tr> <td class="first-col">12</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-12</td> </tr>  
    <tr> <td class="first-col">10</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-16</td> </tr>  
    <tr> <td class="first-col">8</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-20</td> </tr>  
    <tr> <td class="first-col">6</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-24</td> </tr>  
    <tr> <td class="first-col">4</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-28</td> </tr>  
    <tr> <td class="first-col">2</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-32</td> </tr>  
    <tr> <td class="first-col">0</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-36</td> </tr>  
   </table>  
 </div>  
   
   
 <div id="row2-col2">  
   <table>  
    <tr id="header-row">  
      <td>CM<br>RAIN</td> <td colspan="12"></td> <td class="label">TEMP<br>&deg;C</td>  
    </tr>  
    <tr> <td class="first-col">36</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">36</td> </tr>  
    <tr> <td class="first-col">34</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">32</td> </tr>  
    <tr> <td class="first-col">32</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">28</td> </tr>  
    <tr> <td class="first-col">30</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">24</td> </tr>  
    <tr> <td class="first-col">28</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">20</td> </tr>  
    <tr> <td class="first-col">26</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">16</td> </tr>  
    <tr> <td class="first-col">24</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">12</td> </tr>  
    <tr> <td class="first-col">22</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">8</td> </tr>  
    <tr> <td class="first-col">20</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">4</td> </tr>  
    <tr> <td class="first-col">18</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">0</td> </tr>  
    <tr> <td class="first-col">16</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-4</td> </tr>  
    <tr> <td class="first-col">14</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-8</td> </tr>  
    <tr> <td class="first-col">12</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-12</td> </tr>  
    <tr> <td class="first-col">10</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-16</td> </tr>  
    <tr> <td class="first-col">8</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-20</td> </tr>  
    <tr> <td class="first-col">6</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-24</td> </tr>  
    <tr> <td class="first-col">4</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-28</td> </tr>  
    <tr> <td class="first-col">2</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-32</td> </tr>  
    <tr> <td class="first-col">0</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td class="last-col">-36</td> </tr>  
   </table>  
 </div>  
   
   
 </body>  
 </html>

Final Result

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Wednesday, October 23, 2013

IBM Demos Some of My Work on Youtube.com

I just noticed that IBM published a demo of some of the work I did on the IBM Network Protection NextGen IPS - Management Dashboard.

Screen shot of Dashboard



What is this thing?

This is the management dashboard for a Next Generation Intrusion Protection Device.

The NextGen IPS device like a fancy firewall that understands the content in corporate IP traffic which allows corporate management to monitor and control traffic by user (or contrived) groups, application type and more.

Here are some examples of what this device can do (and what you can manage via this dashboard):
  • A manager could allow all employees to view Facebook, but not allow the Finance group to use Facebook Chat application.
  • A manager could view which applications are hogging the corporate bandwidth
  • A manager could see who's trying to send credit card or SSN information across the network

References

http://www.youtube.com/watch?v=NB6Wea3xMGg
http://www-03.ibm.com/software/products/us/en/network-ips/
http://hackmageddon.com/tag/web-application-firewall/
http://lexsheehan.blogspot.com/2013/10/mavericks-osx-109-upgrade.html
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Mavericks (OSX 10.9) Upgrade

I just upgraded one of my computers to OSX 10.9.

I'll post issues related to this upgrade that pop up as time permits...

Caution

I'd recommend your making a full backup before upgrading.

Expectations

Expect the installation to
  • take longer than advertised
  • require reinstall of your Java runtime
  • replace SecondBar functionality (if you have multiple monitors)

Install Java Runtime

If you get an error message like, "you need a java se 6 runtime" when opening your mac apps, just install a Java Runtime from: http://support.apple.com/kb/DL1572?viewlocale=en_US


Install Nokogiri

Error when installing nokogiri gem


Installing nokogiri (1.5.4)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/lex/.rbenv/versions/1.9.3-p448/bin/ruby extconf.rb
checking for libxml/parser.h... no
-----
libxml2 is missing.  please visit http://nokogiri.org/tutorials/installing_nokogiri.html for help with installing dependencies.
-----
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
	--with-opt-dir
	--without-opt-dir
	--with-opt-include
	--without-opt-include=${opt-dir}/include
	--with-opt-lib
	--without-opt-lib=${opt-dir}/lib
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/Users/lex/.rbenv/versions/1.9.3-p448/bin/ruby
	--with-zlib-dir
	--without-zlib-dir
	--with-zlib-include
	--without-zlib-include=${zlib-dir}/include
	--with-zlib-lib
	--without-zlib-lib=${zlib-dir}/lib
	--with-iconv-dir
	--without-iconv-dir
	--with-iconv-include
	--without-iconv-include=${iconv-dir}/include
	--with-iconv-lib
	--without-iconv-lib=${iconv-dir}/lib
	--with-xml2-dir
	--without-xml2-dir
	--with-xml2-include
	--without-xml2-include=${xml2-dir}/include
	--with-xml2-lib
	--without-xml2-lib=${xml2-dir}/lib
	--with-xslt-dir
	--without-xslt-dir
	--with-xslt-include
	--without-xslt-include=${xslt-dir}/include
	--with-xslt-lib
	--without-xslt-lib=${xslt-dir}/lib
	--with-libxslt-config
	--without-libxslt-config
	--with-pkg-config
	--without-pkg-config
	--with-libxml-2.0-config
	--without-libxml-2.0-config
	--with-libiconv-config
	--without-libiconv-config


Gem files will remain installed in /Users/lex/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/nokogiri-1.5.4 for inspection.
Results logged to /Users/lex/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/nokogiri-1.5.4/ext/nokogiri/gem_make.out

An error occurred while installing nokogiri (1.5.4), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.5.4'` succeeds before bundling.
You can try upgrading homebrew ... 

$ brew update
$ brew upgrade
...and you may feel good your progress, and try to reinstall nokogiri and it's dependencies... 

brew install libxml2 libxslt
brew link libxml2 libxslt
gem install nokogiri
But you'll probably get the following message: Warning: No developer tools installed. You should install the Command Line Tools. Run `xcode-select --install` to install them. But you'll probably still have probably still get the following error: 

clang: error: invalid arch name '-arch -D_REENTRANT=1'
error: command 'clang' failed with exit status 1
Finally, when you install nokogiri with xcode dependencies using the following you may profit: 

$ gem install nokogiri -- --with-xml2-include=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/include/libxml2

Update Gemfile

Be sure to reference the proper version of nokogiri in your Gemfile. 

gem 'nokogiri', '~> 1.6'


New Features

Here are a few new features to checkout
  • Upgrade existing apps (Calendar, Finder, Mail/gmail archiving, Notifications)
  • New apps (iBooks, Maps, iCloud Keychain)
  • Power Saving Functionality (Timer Coalescing, Compressed Memory, App Nap)
See the full list here: https://developer.apple.com/osx/whats-new/

Activity Monitor

I'm a fan of the new graphics in the new Activity Monitor's Network graphic...


...largely, because Apple uses the same design that I originally implemented in the IBM Network Protection NextGen IPS (NextGen) - Management Dashboard.

It's easy to see spikes in traffic and the load coming across the wire.

IBM NextGen dashboard traffic widget

The current IBM NextGen dashboard traffic widget implementation is more like what Apple used in pre-10.9 Activity Montior Network graphs:


For a short demo of the BM Network Protection NextGen IPS (NextGen) - Management Dashboard see http://www.youtube.com/watch?v=NB6Wea3xMGg

Fine Grained Control of Which Apps Get Accessibility Features

Unlike previous versions of OS X, which used a universal checkbox in an “all or nothing” approach, the new functionality in Mavericks allows users to individually choose which apps can gain control of the system.

If you use an application like CheatSheets or SizeUp, just add the app in the OSX System Preferences > Security & Privacy > Privacy > Accessibility dialog.

Thoughts

I ran into the nokogiri problem mentioned above, which is not bad and was easy to fix.

Given that this is a FREE upgrade and the tendency of Apple to not support legacy systems for long, upgrading is a no brainer.

References

http://lexsheehan.blogspot.com/2013/10/ibm-demos-some-of-my-work-on-youtubecom.html
http://www.tekrevue.com/2013/06/25/how-to-enable-access-for-assistive-devices-in-os-x-mavericks/
http://www.macrumors.com/roundup/os-x/
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Thursday, October 17, 2013

Convert Spaces to Tabs in one whack

Working with CoffeeScript is a pleasure.

It is easy to create beautiful CoffeeScript code since blocks are determined by indentation.

However, that can be a two edged sword.

If you mix your SPACES with TABs, which can be easy to do in a team development environment, you are in for a world of hurt.

Fortunately, there are techniques for dealing with this TAB/SPACE issue.

Here are a few things I configure in my IDE for working with CoffeeScript files:
  • Use TAB characters instead of SPACES
  • 3 characters per TAB
  • Show Whitespaces

For non CoffeeScript files

For all other file types (not CoffeeScript) I use SPACES
  • Use SPACES for TABs
  • 3 characters (spaces) per TAB
  • Do not show Whitespaces

The reason for using SPACEs, e.g., for Ruby files, is because when copy/pasting from IDE to console you'll often get errors when using TABs.

Bash script used by find command

When I have a number of files that have spaces in them, here's how a convert the lot of them from SPACES to TABs:

unexpand_cmd


FILENAME=$1
CURRENT_PROCESS_NAME=$$
TMP_FILENAME="/tmp/$(basename $0).$CURRENT_PROCESS_NAME.tmp"
if [ -z $FILENAME ]; then
 echo "Usage:  unexpand_cmd "
 exit 1
fi
unexpand -t 3 $FILENAME > $TMP_FILENAME && cat $TMP_FILENAME > $FILENAME && rm $TMP_FILENAME

Word of caution

This assumes that the source files use units of 3 spaces for indentation.

If your source files use other units, you should replace the "3" with what ever unit your files use.

Set the execute bit


$ chmod +x ./unexpand_cmd

p.s. You'll want to save this file in a directory that's on your path.
p.s.s. Since this modifies your source files, please make a full backup before running this.

Run find command and execute unexpand_cmd on each


$ find app/assets/javascripts -name "*js.coffee" -type f -exec unexpand_cmd {} \;

Notes

When you see "Soft Tabs" in your IDE preferences, that means "Use 3 spaces instead of 1 tab character", assuming you have set your tab to 3 spaces.
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