making the coda file system a 1 st class citizen on handheld linux devices sang kil cha jae yoon...

Making the Coda File System a 1st Class Citizen on Handheld Linux Devices

Sang Kil ChaJae Yoon ChongAnoop Jaishankar

15-821/18-843: Mobile and Pervasive Computing – Checkpoint 2

Unlocking the Hildon-FM & Introducing Fine File Manager for Coda

Mentor: Jan Harkes


AgendaAbstractHigh-level RequirementAchievementRisk AnalysisScheduleFuture WorkQuestion


AbstractFailure-resilient, scalable, and secure access

to shared information by mobile user over wireless network is a challenge

Coda file system meets this challenge through disconnected operation, weak connectivity, translucent caching, and other mechanisms


High-level RequirementVisibility

Coda file system should be visible in any appli-cation that uses Hildon-FM library

Hildon-FM should provide graphical user inter-face for authentication

UsabilityUser should be able to access cached informa-

tion in any built-in application


AchievementInstalled Coda client on Nokia N810 device

Analyzed and modified Hildon-FM library to show Coda file system

Designed new user friendly file manager ap-plication

Incorporated Coda authentication module in Hildon-FM library


Coda ClientFailed to run Coda client in Scratchbox envi-

ronmentScratchbox tool-kit does not emulate MaemoOpportunity to learn more about Maemo,

Scratchbox, libraries, and other environmentInstalled Coda client on the device with re-

quired dependenciesWorks for current Maemo version, DiabloCache saved in internal memoryManual load of Venus and kernel module required


Coda ClientManually loading Coda kernel module


Coda ClientManually loading Venus client cache manager


Coda ClientWhat to do next

Automate loading Venus and kernel module

Risk AnalysisVenus crash, kernel module failed to load,

cache directory being deleted Out of scope of this project

Is internal memory enough for Coda? 2 GB space shared with other application Yes, it is


Hildon-FM LibraryApplication transparent vs. application awarePart of Hildon application framework, default li-

brary for Maemo platformDefault application (music player, web browser)

use the library for file system related operation Provides encapsulated view for protection of sys-

temRight click equivalent mechanism support

Analyzed Hildon-FM source code to figure out its structure and modified it to show Coda file system


Hildon-FM LibraryCoda file system is shown in file manager


Hildon-FM LibraryWhat to do next

Refresh Coda directory after Venus is executed and the directory is mounted


File Manager ApplicationFrom application-transparent to application-aware

Some features cannot be made application trans-parent

Source code for Maemo file manager application is not available to developer

There’s no open source file manager that uses Hildon-FM library


File Manager Application

New Fine File Manager (left) and original Maemo File Manager(right)


File Manager ApplicationWhat to do next

Copy and paste, and moveMore options in main menuFull file system display


Authentication ModuleUser has to authenticate with Coda serverParameters required: username, password,

realmTwo ways

Modify and include clog as a functionFork/exec a clog program to authenticate

Problems:Context menu is application-dependent


Authentication Module (cont’d)


Risk AnalysisInternal memory for caching

Software/hardware update

Theft of the device after authentication


ScheduleOriginal schedule after checkpoint 1

Sang Kil: file manager applicationJae Yoon: analyze and modified Hildon-FMAnoop: authentication and file manager appli-

cation

ID Task Days Start Complete

1 Checkpoint 1 17 d 9/1/08 9/23/08

2 Modifying the Hildon-FM 10 d 9/24/08 10/7/08

3 Analyze Coda to combine with the file manager 5 d 10/8/08 10/14/08

4 Combine the file manager with Coda 5 d 10/15/08 10/21/08

5 Checkpoint 2 5 d 10/22/08 10/28/08

6 Debug additional stuff 10 d 10/29/08 11/11/08

7 Installation package & embellishment 5 d 11/12/08 11/18/08

8 Final Demo 10 d 11/19/08 12/2/08

9/1 9/23

9/24 10/7

10/8 10/14

10/15 10/21

10/22 10/28

10/29 11/11

11/12 11/18

11/19 12/2

9/1 9/21 10/11 11/1 11/21 12/11 1/19 10 11 12


ScheduleRevised Schedule, actual work done after checkpoint 1

ID Task Days Start Complete

1 Found source code andanalyzed Hildon-FM

16 d 9/1/08 9/22/08

2 Checkpoint 1 1 d 9/23/08 9/23/08

3 Base file manager application 3 d 9/24/08 9/26/08

4 Implemented event handler 4 d 9/29/08 10/2/08

5 Implemented applicationfunctions

33 d 10/3/08 11/18/08

6 Installed Coda in Scratchbox 5 d 9/24/08 9/30/08

7 Installed Coda on the device 2 d 10/1/08 10/2/08

8 Modifying the Hildon-FM 10 d 10/3/08 10/16/08

9 Authentication module 7 d 10/17/08 10/27/08

10 Checkpoint 2 1 d 10/28/08 10/28/08

11 Debugging 17 d 10/29/08 11/20/08

12 Installation package &embellishment

5 d 11/25/08 12/1/08

13 Final Demo 1 d 12/2/08 12/2/08

9/1 9/22

9/23 9/23

9/24 9/26

9/29 10/2

10/3 11/18

9/24 9/30

10/1 10/2

10/3 10/16

10/17 10/27

10/28 10/28

10/29 11/20

11/25 12/1

12/2 12/2

9/1 9/21 10/11 11/1 11/21 12/119 10 11 12


Future WorkScript for Coda client startupFix Hildon-FM related problem

USB disconnection, mount refreshDistinguish realms in authentication More features in file manager applicationTesting with multiple Coda serverEmbellishment / packaging


Future Work (cont’d)Register with the official Maemo website, as an open source ap-plication


Questions


Hildon-FM LibraryLibraries used in our application


Work Division

New Coda File Man-ager Ap-plication

Hildon-FM Analysis

and Modi-fication

Coda Client Installation and Auto-

mation

Authenti-cation Module

Sang Kil Cha 80% 10% 33% 10%

Jae Yoon Chong 10% 80% 33% 10%

Anoop Jaishankar 10% 10% 33% 80%

making the coda file system a 1 st class citizen on handheld linux devices sang kil cha jae yoon...

Documents

coda client

pervasive computing

coda kernel module slide

challenge coda file

coda mentor

file manager slide

hildonfm library hildonfm

hildon fm library