Johnny [Life & Code]

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Archive for the ‘GNOME’ Category

End of a book : Johnny in Novell

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Last day in Novell.

Started out as an intern in the GNOME team about 5 years back. Jumped between Evolution and iFolder a few times for different (voluntary/involuntary) reasons. Met a lot of good engineers. Had both good / bad times. Learned a lot work / non-work.

Gnomers,

I loved working on Evolution, Evolution MAPI (may not be perfect, but had a awesome time with it And i’m yet to cash in on the few beers i’ve been offered), Attachment Reminder (Trivial, but looks like you guys liked/hated/loved it), Redesign of Evolution search bar and so on. Best bug that I’ve worked on so far was changing a ’1′ to ‘-1′ in EText (Oh those early days! Had no clue what GDB can do.. Used hundreds of ‘printf’s, lots of coffee and tested the patience of office night guards and that adrenalin rush!). Thanks to Novell for the opportunity to contribute full-time and getting paid for that.

Special thanks to my mentor Srini. I’m looking forward for more new awesome fun things in GNOME.

Thanks.

I’ll miss the 1-1 coffee breaks talking games/gadgets/music, discussions on research papers that I don’t have a clue about, conversations during ‘tea breaks’ outside office (you would see me very inspired/productive after those sessions), thursday nights ;-) & nice friends that I found beyond ‘work’.

The End.

Written by Johnny

March 4, 2011 at 12:00 pm

Push Email for GNOME Evolution’s Exchange MAPI provider (exchange 2007)

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After few days of crazy bug hunting (and creating the same) , we have a nice push event notification framework for Evolution-MAPI. When Evolution is running all the changes happening in user’s mailbox in server would immediately be synced. This avoids those long fetches from server.  A short screen cast (watch in HD) :
Currently I’ve got “new mail” event handled and is limited to mailer. Would be working on other events. This feature has some major issues to be solved before it can land in master.
It is FUN !

 

Written by Johnny

November 24, 2009 at 7:28 pm

ACL Reconstruction recovery journal

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Tore my ACL while playing badminton. An awesome jump, delivered a smash at a impressive angle. On landing I slipped twisting my ankle and entire weight of my body fell on the right knee. After 15 minutes I was walking out of the club with the idea of a 10k ride (cycle) back home. Probably I was high on adrenaline/endorphins. But as soon as walked 20 meters, I couldn’t take another step.

Friends helped me out. Few days later a MRI confirmed the ACL tear. Sought opinions from 3 surgeons. A day later I was scheduled for ACL Reconstruction.

Day 0 : Wheeled into surgery. Got shots of anaesthesia in my spine. 5 minutes into the procedure I started feeling my knee again. Then some new shots to my neck and i’m out for next 4 hours. Woke up in recovery room. Crying with pain in my thigh and knee.

Day 1 : High fever. Unable to move my leg. Felt like a dead log.

Day 2 : Realised that morphine (a better refined form .. Fentanyl ?) is being pumped in to me 24 hours.

Day 3: Fever continues. Unable to therapy. But was on CPM.

Day 5 : First time moved around 10 meters (felt like 5 km) to physio rehab. Was able to walk holding support ramps. Did some weight excercises. Morale boost.

Day 6 : Fever started fading.

Day 7 : Discharged from hospital. Realized I lost so much muscle mass. Right leg is very lean.

Day 8 : Woke up at brother’s place. Good food. Ate like a hungry pig.

Day 11 : Regained some strength in the thighs. Able to move around confidently with support.

Day 16 : Moved back to my own place.

Day 17 : Afraid to bend my knee. Looks like I’m resisting to bend the knee.

Day 18 : Able to sit with around 90 degree bend in my knee. Noticed some muscle development.

Day 19 : 90 Degrees knee bending :D

Day 21 : Mental battle is tougher than actually bending the knee.

Day 22 : Walking without support (crutches). Yay!

Able to handle stairs without support.

Day 25 : 95 – 100 Degrees. Moving to Squat exercises.

Started riding on a stationary bike. Able to walk  small distance with little limp.

Day 31 : 115 Degrees. Knee feels stronger.

Day NN : Recovery still continuing. Yet to build muscles. And regain those remaining degrees. But I’m confident now that i would be back to 110% in few months (yeah .. months!).

I should confess that I’m not a very fit athlete. I’m just a ordinary clumsy guy who started playing a bit. So this is my recovery timeline. Rehab is the tough part. Painful and needs a good amount of will power to keep doing it. It is going to take a long time to get back to my running (hopefully a marathon!). Can’t wait to get back on my bike (cycle).

One thing I kept remembering was this “Pain is temporary. Quitting lasts forever” (Lance Armstrong). In this case it is literally true.

Notes :

  • Do research. Learn about the injury and the procedure before you go in. Helps a lot. Realize that you have options on the graft being used.
  • Ice is the best pain management you got. I personally don’t like pain killers.
  • Most of the online materials on this subject give times lines for fit athletes. So don’t get discouraged if you are not. Keep at it.
  • Mail from nice people at Bangalore Bikers Club

Misc :

  • Fun when you are on a stretcher and pushed around. Profound :)
  • Scary part was not the surgery, but the catheter in my arm. Got over it after a day.
  • Enjoyed the royal treatment. People always around you. don’t have to do anything. Everything is there as soon as you think about it!
  • I was without a laptop for about 15 days.
  • Long phone calls from stoned friends. ;-)
(Would try to add more information and keep this post updated ..)

Written by Johnny

November 8, 2009 at 6:13 am

GDB Scripting : A short article for a internal magazine

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I wrote a small article for a internal magazine and few of my friends wanted me to post it to this blog.

This is for people who are new to GDB and still exploring itz features. So if you’ve used GDB for more than few weeks please ignore and skip :)

GDB – Scripting

A good majority of novice programmers tend to use printf functions to trace function calls and to printout the debug data. This forces you to change the code and compile again and again. To eliminate these superfluous tasks from your day-to-day work, use GDB. The GDB has facilities for scripting and helps in saving plenty of your time.

Tracing Function Calls

If you want to know whether a function is called or not, create a break point and write a simple script.

<code>

#Set the breakpoint

(gdb) b mapi_sync

Breakpoint 1 at 0x7fffd75f36e2: file camel-mapi-folder.c, line 741

#Tell GDB what to do when the breakpoint is reached

(gdb) commands

Type commands for when breakpoint 1 is hit, one per line.

End with a line saying just “end”.

> continue

> end

(gdb)

</code>

continue – Come out of break and continue

end – terminate command list

Run the program now. The GDB prints the function name when the breakpoint is hit and automatically continues running the program.

Breakpoint 1, mapi_sync (folder=0xc9c1a0, expunge=0, ex=0xf3a0c0) at camel-mapi-folder.c:741

741             CamelMapiStore *mapi_store = CAMEL_MAPI_STORE (folder->parent_store);

Using the GDB Scripts for Analyzing the Data

Suppose that you have a singly-linked list that has strings in it. At some point, you might want to know the contents of the list. To do this, use the GDB scripting instead of adding the debug statements in your code.

<code>

#Example for gslist traversal.

define p_gslist_str

set $list = ($arg0)

while ((GSList *)$list->next != 0)

p (char *)(GSList *)$list->data

set $list = (GSList *)$list->next

end

end

document p_gslist_str

p_gslist_str <list>: Dumps the strings in a GSList

end

</code>

Add the above snippet into a file and load it into the GDB as follows:

<code>

(gdb) source /home/jjohnny/scripts/gdb/gslist.gdb

</code>

Now, anywhere you want to take a look in the GSList, simply break and

<code>

(gdb) p_gslist_str server_uid_list

$17 = 0x7fffd81101b0 “7666BC1E000000015870BD1E00000001″

$18 = 0x7fffd810e330 “7666BC1E000000015970BD1E00000001″

$19 = 0x7fffd810cbe0 “7666BC1E000000015C70BD1E00000001″

</code>

Simple scripts thus can save you a lot of time from adding or removing the debugging statements from your code. Now go ahead and create a suite of scripts to aid the library you are writing.

More cool developer tricks later. Have fun !

— End —

Thanks to Radhika for editing the article.

Btw when is Archer branch  (Python scripting) getting into GDB ? I’ve been using it a bit .

GDB

- Scripting

A good majority of novice programmers tend to use printf functions to trace function calls and to printout the debug data. This forces you to change the code and compile again and again. To eliminate these superfluous tasks from your day-to-day work, use GDB, the GNU Project Debugger. The GDB has facilities for scripting and helps in saving plenty of your time.
Tracing Function Calls
If you want to know whether a function is called or not, create a break point and write a simple script.
<code>
#Set the breakpoint
(gdb) b mapi_sync
Breakpoint 1 at 0x7fffd75f36e2: file camel-mapi-folder.c, line 741
#Tell GDB what to do when the breakpoint is reached
(gdb) commands
Type commands for when breakpoint 1 is hit, one per line.
End with a line saying just “end”.
> continue
> end
(gdb)
</code>
continue – Come out of break and continue
end – terminate command list
Run the program now. The GDB prints the function name when the breakpoint is hit and automatically continues running the program.
Breakpoint 1, mapi_sync (folder=0xc9c1a0, expunge=0, ex=0xf3a0c0) at camel-mapi-folder.c:741
741             CamelMapiStore *mapi_store = CAMEL_MAPI_STORE (folder->parent_store);
Using the GDB Scripts for Analyzing the Data
Suppose that you have a singly-linked list that has strings in it. At some point, you might want to know the contents of the list. To do this, use the GDB scripting instead of adding the debug statements in your code to print out the data.
</code>
#Example for gslist traversal.
define p_gslist_str
set $list = ($arg0)
while ((GSList *)$list->next != 0)
p (char *)(GSList *)$list->data
set $list = (GSList *)$list->next
end
end
document p_gslist_str
p_gslist_str <list>: Dumps the strings in a GSList
end
</code>
Add the above snippet into a file and load it into the GDB as follows:
<code>
(gdb) source /home/jjohnny/scripts/gdb/gslist.gdb
</code>
Now, anywhere you want to take a look in the GSList, simply break
<code>
(gdb) p_gslist_str server_uid_list
$17 = 0x7fffd81101b0 “7666BC1E000000015870BD1E00000001″
$18 = 0x7fffd810e330 “7666BC1E000000015970BD1E00000001″
$19 = 0x7fffd810cbe0 “7666BC1E000000015C70BD1E00000001″
</code>
Simple scripts thus can save you a lot of time from adding or removing the debugging statements from your code.
Now go ahead and create a suite of scripts to aid the library you are writing.
More cool developer tricks later. Have fun !

Written by Johnny

July 7, 2009 at 8:56 am

openSUSE 11.1 on PS3

with 9 comments

Woohoo ! After a long delays and issues (in the last few days) I’ve managed to install openSUSE 11.1 in my PS3.  Running a full blown desktop is very sluggish. Reminds me of my first computer (amdk6 500mhz). Some screenies :

6 SPEs

Now onto get the Cell SDK running … Synergetic Processing Elements (SPE) here i come !

Written by Johnny

July 4, 2009 at 10:41 am

Posted in CODE, GNOME, LIFE, Linux Fun, PS3, suse, Tech

Makespace – Plugin for GNOME Evolution

with 6 comments

I’ve written (incomplete) simple plugin for Evolution which provides a combo box + menu for switching folders. Now you can hide the sidebar. This really helps in freeing up some space in your screen and can have good vertical view layout. This would help computers with smaller screen size.

Screenshots :

makespace-thumbSidebar hidden. Small combo box in top left corner

makespace-expanded-thumb1

Switching folders

To try out this plugin / For more information :   http://www.johnnyjacob.org/makespace.html .

One other feature that I would like to have is simple folder bookmarks. Bookmarked folders would appear in the top of the menu (You don’t have to navigate all the way down in the menus)

Let me know what you think and if you would like to have any features put it down in the comments. :)

Written by Johnny

April 7, 2009 at 3:59 pm

Posted in CODE, GNOME, Programming, suse, Tech

Evolution MAPI update release. (0.26.0.1)

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Hello,  I just released a update to evolution-mapi. 0.26.0.1 has fix for Bug 574784 without which the package is totally unusable.

Thanks !

Written by Johnny

March 19, 2009 at 10:55 am

Posted in CODE, Evolution, GNOME, suse, Tech

Tagged with ,

Evolution MAPI : Debut tarball release & RPM Repos are online

with 16 comments

Written by Johnny

December 15, 2008 at 1:08 pm

Posted in CODE, Evolution, GNOME, suse, Tech, Work

Tagged with

Evolution MAPI : Contributions… Testing… Bugzilla …

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Development is more active after our move to new svn ! Julien (of openchange.org) has patched evolution-mapi to be compatible with libmapi 0.8 .Patches are welcome :) !

Some of the cool things with libmapi 0.8 is the possibility of having multiple exchange accounts (multiple sessions) in Evolution (Yep. you read that right! ). But they will hit the trunk little later .

Now more focus is on real world testing on servers other than few test servers we are running. What doesn’t work in different setups is something we would like to know and fix them all ! Thanks to those who have been reporting issues and TIA :)

NEWS :

+ evolution-mapi is proposed for GNOME 2.26. Yay !

+ we have a new product ‘evolution-mapi’ in GNOME bugzilla.

+ Wiki page is updated with information on building evolution-mapi .

Written by Johnny

November 24, 2008 at 10:03 am

Posted in CODE, Evolution, GNOME, suse, Tech, Thoughts, Work

Tagged with

Evolution MAPI : New SVN Repository

with 6 comments

New SVN repo for evolution-mapi provider is created :

** svn://svn.gnome.org/svn/evolution-mapi **

This repo has :
1. MAPI Account setup e-plugin.
2. libexchangemapi – Backend code for talking to server using openchange’s libmapi.
3. Evolution Data Server backends for addressbook and calendar.
4. Camel provider (mails).

More information on building evolution-mapi is available here .

We will be creating a new bugzilla component in bugzilla.gnome.org for evolution-mapi.

[ Update Nov 22 : Please report bugs under 'evolution-mapi' product in GNOME Bugzilla. ]

The EXCHANGE_MAPI_BRANCH[1][2] is closed.

Builds (RPMs) will resume shortly.

[1] svn://svn.gnome.org/svn/evolution-data-server/branches/EXCHANGE_MAPI_BRANCH

[2] svn://svn.gnome.org/svn/evolution/branches/EXCHANGE_MAPI_BRANCH

Written by Johnny

November 19, 2008 at 6:16 am

Posted in CODE, Evolution, GNOME, Tech, Work

Tagged with

Happy birthday Srini

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Happy Birthday Srini!

GUADEC : If you see him . Don’t forget to wish him ! :)

Written by Johnny

July 12, 2008 at 5:44 am

Posted in GNOME, LIFE

Evolution Exchange 2007 (MAPI) Provider : Changes in schedule and more.

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Code :

We have moved away from libmapi 0.7 to libmapi trunk (0.8 development) , so we can take advantage of the new APIs.

We will be constantly updating our code base to libmapi trunk.

http://www.go-evolution.org/MAPIProvider#Feature_Status

Currently :

Suman is busy in integrating meetings into evolution. (few more tasks left)

I’m currently working on finishing (completing) off the basic features in mailer and will move to optimizing the sync & more.

Schedules :

Sadly, we won’t be able to make it to Evolution 2.24 as we are late (details here). :( Meanwhile we will continue to provide pluggable packages and this will be available as a pluggable provider. 2.26 will have this.

Licensing :

Yay ! Very exciting day. Evolution licence change was announced by Michael Meeks in my talk this morning (Exchange, MAPI and Evolution) . Announce mail here!! .

Update 1 : GUADEC Talk available here

Written by Johnny

July 11, 2008 at 11:47 am

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