Difference between revisions of "Running Linux Applications Under Sugar"

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'''Note:''' This article is about running Linux applications inside Sugar, not launching them in Terminal.
+
'''Note:''' This article is about running standard GNU/Linux applications inside Sugar by using the Activities icon panel rather than starting them from the Terminal.
  
−
To run standard Linux program under Sugar (i.e. making them to run in the Sugar interface, without the collaboration and other Sugar integration programmed into them), read these instructions.
+
== Running GNU/Linux Applications Under Sugar ==
  
−
A woman named CatMoran created a script that automates most of the steps of Sugar Coating Linux applications to run under Sugar.  
+
There are two ways to run GNU/Linux applications as Activities under Sugar (meaning you don't need to use Terminal to load them):
 +
*'''Sugar Coating''' - Making Linux apps run under Sugar, but not modifying them to take advantage of Sugar's collaborative capabilities
 +
*'''Sugarizing''' - A fully integrated Linux application, re-engineered to take advantage of Sugar's advanced collaboration abilities
 +
*: See these instructions: How to sugarize an application: [http://people.sugarlabs.org/Tgillard/sugarize/wiki-sugarize.txt]
 +
=== Sugar Coating Activities ===
  
−
*The process has be confirmed to work with Firefox, Seamonkey, Midnight Commander and Totem.It it presumed to work with many other Linux programs.
+
To run Linux apps under Sugar (''i.e.'', making them to run in the Sugar interface, without the collaboration and other Sugar integration programmed into them), read these instructions on [[Running Linux Applications Under Sugar]].
−
*It doesn't work for roto's current mplayer configuration, because only programs that use the same command every time (ie, no input file name, in this case) can be set up to run this way.
+
 
 +
In the future, we hope that Sugar will be able to run Linux applications natively without these steps.
 +
 
 +
=== Sugarizing Activities ===
 +
 
 +
See [[Activity Team]] for information on porting regular applications to run as native Sugar Activities.
 +
 
 +
==Sugar Coating==
 +
 
 +
Many standard GNU/Linux programs can be run within Sugar, but without the collaboration and other Sugar integration programmed into them. The process of adding an icon to the Sugar Activities panel is called "Sugar Coating".
 +
 
 +
A simple script to automate the process was created by a woman named CatMoran. The script:
 +
 
 +
*has be confirmed to work with Firefox, Seamonkey, Midnight Commander, TuxType2, TuxPaint and Totem. It it presumed to work with many other GNU/Linux programs.
 +
*only works with programs that use the same command every time (i.e., a single command with no qualifiers). It doesn't work for roto's current mplayer configuration, because the mplayer command requires an input file name to start the program.
 +
 
 +
{{Note/warning|NOTE:|The procedure outlined below may not work for some versions of Sugar and Fedora. For example on F11 / S0.84 and newer activities sugarized this way crash X.org in some conditions with a BadWindow error. '''A workaround <!-- the solution is to fix X to not crash so easily, is this logged anywhere as a denial of service? -->''' is to obtain the source to libsugarize.c and build libsugarize.so from it -- see http://dev.laptop.org/git/users/albert/sugarize/ . Also recommended: the shell version of 'sugarize', at http://lists.laptop.org/pipermail/devel/2008-January/009387.html
 +
:Some tests with Sugar 0.96.2 were successfull (see [[{{TALKPAGENAME}}#It works!|this comment]]).}}
  
 
===To setup (one time):===
 
===To setup (one time):===
Line 12: Line 33:
 
<li>Start a Terminal activity.</li>  
 
<li>Start a Terminal activity.</li>  
 
<li>Enter the following commands:</li>  
 
<li>Enter the following commands:</li>  
−
  su
+
  mkdir sugarize
−
  wget http://www.catmoran.com/olpc/libsugarize.so
+
  wget http://dl.dropbox.com/u/1203534/sugarize/libsugarize.so
 
  chmod 755 libsugarize.so
 
  chmod 755 libsugarize.so
−
  wget http://www.catmoran.com/olpc/sug
+
  wget http://dl.dropbox.com/u/1203534/sugarize/sug
 
  chmod 755 sug
 
  chmod 755 sug
  
−
(What do those commands do? They log you in as root, gets a copy of Albert Cahalan's compiled libsugarize file, and gets the script CatMoran created.)
+
(What do those commands do? They log you in as root, gets a copy of Albert Cahalan's compiled libsugarize file, and gets the script CatMoran created, modified by akiwiguy.)
 +
 
 +
Next, run this:
 +
vi sug
 +
and change the CREATEPATH variable to /home/$yourusernamehere/Activities
  
 
Optional, if you want to use one of the icons CatMoran created:
 
Optional, if you want to use one of the icons CatMoran created:
−
  wget http://www.catmoran.com/olpc/plain.svg
+
 
−
  wget http://www.catmoran.com/olpc/ff.svg
+
  wget http://ia341002.us.archive.org/3/items/Sugarize/plain.svg
−
  wget http://www.catmoran.com/olpc/l.svg
+
  wget http://ia341002.us.archive.org/3/items/Sugarize/ff.svg
 +
  wget http://ia341002.us.archive.org/3/items/Sugarize/l.svg
 
</ol>
 
</ol>
  
−
===To Run:===
+
===To Run (once per program that you want to Sugar Coat):===
 
<ol>
 
<ol>
 
<li>Locate an icon you want to use/reuse.</li>
 
<li>Locate an icon you want to use/reuse.</li>
 
*You can copy any .svg file located in /usr/share/activities/*.activity/activity/*.svg
 
*You can copy any .svg file located in /usr/share/activities/*.activity/activity/*.svg
−
*Or you can use one of the icons I've created. (wget commands above.) plain.svg is a plain circle, ff.svg is a circle with the letters FF (for Firefox) inside, l.svg is a circle with the single letter L inside. Bot of these files can be easily edited using any text editor and one or both character(s) changed.Each letter is in plain text just before the </tspan> tags, replace them and save the file.
+
*Or you can use one of the icons CatMoran created--and downloaded using the wget commands listed above. plain.svg is a plain circle, ff.svg is a circle with the letters FF (for Firefox) inside, l.svg is a circle with the single letter L inside. Both of the latter files can be easily edited using any text editor and one or both character(s) changed. Each letter is in plain text just before the </tspan> tags, replace them and save the file.
 +
 
 +
<li>Enter the following commands, to log in as root and execute the sug script. T quit the script at any time, just enter nothing at the prompt and hit the Enter button.</li>
  
−
Enter the following commands, to log in as root and execute the sug script.
+
*** In Uruguay, the XO laptops do not allow you to login as root because LATU have blocked this.
 +
Please offer a alternative way, maybe using a Linux PC.
 +
-- alejandro.lavarello (at) gmail (dot) com ***
 +
Fixed, don't need root privleges now. [[User:Akiwiguy|Akiwiguy]] 06:39, 18 September 2010 (EDT)
  
−
su
 
 
  ./sug
 
  ./sug
  
−
You'll be prompted for an activity name. Enter a short, descriptive name with no spaces or punctuation, such as BibleTime or Firefox.
+
First, you'll be prompted for an activity name. Enter a short, descriptive name with no spaces or punctuation, such as BibleTime, Firefox, or MC.
  
−
You'll be prompted for an icon file to copy into the new task. You can enter the full path and filename of any .svg file. If the icon is in the same directory as the sug file, you can enter just the filename.
+
Second, you'll be prompted for an icon file to copy into the new task. Enter the [[Documentation Team/Glossary|full path and filename]] of any .svg file. If the icon is in the same directory as the sug file, you can enter just the filename.
  
−
You'll be prompted for the command to start the program. This is the command you entered from Terminal to start the program, such as firefox.
+
Next, you'll be prompted for the command to start the program. This is the command you type at the Terminal prompt to start the program, such as firefox, totem, or mc.
  
−
You'll be prompted for an organization path, such as org.mozilla If you don't know what this is, just enter org.x
+
Finally, you'll be prompted for an organization path, such as org.mozilla If you don't know what this is, just enter org.x
  
−
(If at any of the prompts you want to quit the script, just enter nothing at the prompt.)
+
The script will give you a success message. Reboot Sugar by pressing Ctrl-Alt-Erase (the Control, Alt and Erase buttons) at the same time. When Sugar restarts you will now see the new icon in the Sugar taskbar. A simple click on the icon will start the newly Sugar Coated program, like any other Sugar Activity.
−
 
 
−
The script will give you a success message. Reboot sugar to see the new task in the Sugar taskbar.
 
 
</ol>
 
</ol>
  
−
===Sugarize Mirror Servers===
+
===Sugar Coat Script Mirror Servers===
  
 
*Main Page - [http://www.archive.org/details/Sugarize http://www.archive.org/details/Sugarize]
 
*Main Page - [http://www.archive.org/details/Sugarize http://www.archive.org/details/Sugarize]
Line 57: Line 85:
  
  
 +
*'''See also: - [http://wiki.sugarlabs.org/go/Category_talk:Live_USB#Sugarize_an_application_for_use_in_a_SoaS_USB Sugarize_an_application_for_use_in_a_SoaS_USB]'''
 +
*'''Alternate Instructions: [http://people.sugarlabs.org/Tgillard/sugarize/wiki-sugarize.txt wiki-sugarize.txt]'''
 +
::Local storage of needed files:http://people.sugarlabs.org/Tgillard/sugarize/ with permission from Albert Cahalan.
 +
*'''Source''' - [http://olpcnews.com/forum/index.php?topic=1555.0 http://olpcnews.com/forum/index.php?topic=1555.0]
 +
*http://dev.laptop.org/git/users/albert/sugarize/
 +
 +
===Comments===
 +
'''Look at:''' http://people.sugarlabs.org/Tgillard/sugarize/wiki-sugarize.txt
 +
 +
I haven't been able to get this to work in Update.1 --leetcharmer
 +
 +
Rob - I modified the script to work in Update 1 for SeaMonkey, but it requires an effective disabling of security.  The crux of the problem is that Rainbow 1) runs your application as a totally new user each time (never as "olpc"), 2) these "on-the-fly" users don't have write access to their home directories, and 3) these "on-the-fly" users are destroyed on reboot.    All of these users are created in the same persistent group, and all share write access to a common "data" directory for the group.  (The preceding is just a paraphrase of the Rainbow docs - should likely be a link).  In the case of non-Sugar apps, the application has no idea that the usual role of a user has been migrated to a group, and so the application is unlikely to create it's data files with the correct permissions.  Further, since the "on-the-fly" users are destroyed on each reboot, if the username appears in persistent data (e.g., absolute pathnames), the application will fail after a reboot.  All of these issues are addressed in the following for the SeaMonkey application.
 +
 +
'''Note Well:'''  ''The following instructions essentially remove all security on your machine.  If you have set passwords on any of the machine accounts (root, olpc, etc.), likely you don't want to execute these instructions.''
 +
 +
<pre>
 +
[olpc@xo ~]$ su
 +
[olpc@xo ~]# chmod a+s /bin/chmod
 +
</pre>
 +
 +
These lines allow any user to change permissions on any file and/or directory in the system.  Therefore, having something only readable / executable by root is no longer a protection, since an unprivileged user can just change the permissions.  In my case, I couldn't lose what I didn't have -- I have no password for the root or olpc users, so there was no effective change.
 +
 +
In general sudo would be a more graceful approach to this problem, but I couldn't get it to work in a script (first, you need to allow all uids > 10000; second, you need it to not prompt for a password; and third, su can't be invoked from a Sugar script because stdin is not a tty, even if no password is required).
 +
 +
After using the above to allow the Rainbow "on-the-fly" users to change permissions on files they don't own, we use the chmod ability in the script.  The following script is just CatMoran's script with a few lines added at the beginning.  Any other minor formatting changes are accidental and a result of my editing the file 100 times to try to find out why it wasn't working.  I've only tested this script with SeaMonkey -- but I think similar ideas would work for other applications.
 +
 +
<pre>
 +
#!/bin/sh
 +
 +
# Causes SeaMonkey to put the .mozilla directory in a
 +
# place that is writable, and also where Rainbow wants
 +
# it.  SUGAR_ACTIVITY_ROOT/data is not directly suitable
 +
# since it contains a reference to a user that will
 +
# be destroyed on reboot, and SeaMonkey stores absolute
 +
# pathnames in its persistent data.
 +
export HOME=`/bin/ls -l $SUGAR_ACTIVITY_ROOT/data | /usr/bin/awk '{ print $10 }'`
 +
 +
# libgnomevfs ignores the HOME environment variable,
 +
# so make our actual home directory writable for the
 +
# .gnome2 and .gnome2_private directories.
 +
chmod g+w $SUGAR_ACTIVITY_ROOT
 +
 +
# SeaMonkey ignores umask and makes everything
 +
# only user-accessible.  But, we're running as
 +
# a different user each time.  So make everything
 +
# in HOME group-accessible (at a minimum, make
 +
# .mozilla and everything in it group-accessible).
 +
chmod -R g+rwx $HOME/.*
 +
chmod -R g+rwx $HOME/*
 +
 +
while [ -n "$2" ] ; do
 +
    case "$1" in
 +
        -b | --bundle-id)    export SUGAR_BUNDLE_ID="$2" ;;
 +
        -a | --activity-id)  export SUGAR_ACTIVITY_ID="$2" ;;
 +
        -o | --object-id)    export SUGAR_OBJECT_ID="$2" ;;
 +
        -u | --uri)          export SUGAR_URI="$2" ;;
 +
        *) echo unknown argument $1 $2  ;;
 +
    esac
 +
    shift;shift
 +
done
 +
export LD_PRELOAD="$SUGAR_BUNDLE_PATH/lib/libsugarize.so"
 +
export NET_WM_NAME="SeaMonkey"
 +
exec /usr/bin/seamonkey
 +
</pre>
 +
 +
Brian - To make this work for SoaS Release 1 (Sugar 0.84.2) the sug script needs to be updated.
 +
<pre>
 +
CREATEPATH=/home/liveuser/Activities/
 +
</pre>
 +
 +
==Useful GNU/Linux Applications==
 +
 +
===VLC Media Player===
 +
The VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, flv, avi, ogg, ...) as well as DVDs, VCDs, and various streaming protocols.  It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.; the VLC Player is considered to be better by some users then MPlayer because it offer more settings, options and features. There is also no need to run it from Terminal. Read [[Activities/VLC]] to learn how to install it.
 +
 +
===Seamonkey===
 +
SeaMonkey has inherited the successful all-in-one concept of the original Netscape Communicator and continues that product line based on the modern, cross-platform architecture provided by the Mozilla project.
 +
 +
* The Internet browser at the core of the SeaMonkey suite uses the same rendering engine as its sibling Mozilla Firefox, with popular features like tabbed browsing, popup blocking, find as you type and a lot of other functionality for a smooth web experience.
 +
* SeaMonkey's Mail and Newsgroups client shares lots of code with Mozilla Thunderbird and features adaptive Junk mail filtering, labels and mail views, multiple accounts, S/MIME, address books with LDAP support and is ready for both private and corporate use.
 +
* Additonal components include an easy-to-use HTML Editor, the ChatZilla IRC chat application and web development tools like a DOM Inspector and a JavaScript debugger.
 +
* If that's still not enough, SeaMonkey can be extended with numerous Add-Ons that provide additional functionality and customization for a complete Internet experience.
 +
 +
Seamonkey can be Sugar-coated.
 +
 +
===Midnight Commander===
 +
Midnight Commander is a text-mode file manager and visual command shell. It is easily Sugar-coated for access from the Activities panel. [http://www.ibiblio.org/mc/images/mc-panels.png Screenshot] You can also run it directly in Terminal. ([http://www.research-service.com Paper Writers])
 +
 +
===Totem Media Player===
 +
The Totem media player is already installed in the OLPC XO-1. It is the engine that supports media on the system. Out of the box it does not support MP3 music or MPEG-4 video. A free driver can be downloaded to add MP3 compatability. A Sugar-coating can be applied to easily access the program from the Activities panel.
 +
 +
===[http://tux4kids.alioth.debian.org/ Tux4Kids]===
 +
;TuxType2: [http://tuxtype.sourceforge.net/ TuxType] is a touch typing tutorial/game than can be installed on the OLPC XO-1 using the yum command. A Sugar-coating can be applied to easily access the program from the Activities panel.
 +
;TuxMath: [http://tux4kids.alioth.debian.org/tuxmath.php TuxMath] is an arcade game that helps kids practice their math facts. A Sugar-coating can be applied to easily access the program from the Activities panel.
 +
;TuxPaint: [http://www.tuxpaint.org/ Tux Paint] is a  drawing program for children ages 3 to 12. It combines an easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who guides children as they use the program. A Sugar-coating can be applied to easily access the program from the Activities panel.
 +
 +
===UCBLogo===
 +
 +
Logo was [[OLPC:Seymour Papert|Seymour Papert's]] language from the 1960s for children, originally providing Turtle Graphics by controlling a robot turtle. There is a large literature on using Logo to teach programming to children.
 +
 +
Turtle Art can produce [[Activities/TurtleArt/Tutorials/Turtle_Art_and_Logo|Logo output]], but we do not have a Logo activity in Sugar. UCBLogo is available in many Linux distributions, and can be installed (with yum on XOs, yum or apt tools on other Linuces) and run in Terminal. The command window opens a graphic window that the user can drag around. Entering turtle graphic commands at the command line then causes graphic output in the Logo window.
 +
 +
===J===
 +
 +
J is Turing Award winner Ken Iverson's last version of [[OLPC:APL|APL]], his language for describing computers and algorithms, designed originally for human use, not as a programming language. In order to avoid the controversy that surrounded the APL character set and keyboard layouts, J uses only ASCII. J Software, Iverson's company, [http://replacingtextbooks.wordpress.com/2011/07/26/another-programming-language-for-sugar/ put a version of J under GPL3] in March 2011. It can be installed and run from the command line. A Debian package is in preparation.
  
−
'''Source''' - [http://olpcnews.com/forum/index.php?topic=1555.0 http://olpcnews.com/forum/index.php?topic=1555.0]
+
Iverson successfully used APL to teach arithmetic to first-graders on a loaned IBM 360 with Selectric printing terminals using APL typeballs. He wrote a book on teaching ''Arithmetic'', published by APL Press but now out of print. [[User:Mokurai|Mokurai]] is preparing to add it to the [[Replacing Textbooks]] server.

Latest revision as of 10:53, 31 August 2012

Note: This article is about running standard GNU/Linux applications inside Sugar by using the Activities icon panel rather than starting them from the Terminal.

Running GNU/Linux Applications Under Sugar

There are two ways to run GNU/Linux applications as Activities under Sugar (meaning you don't need to use Terminal to load them):

  • Sugar Coating - Making Linux apps run under Sugar, but not modifying them to take advantage of Sugar's collaborative capabilities
  • Sugarizing - A fully integrated Linux application, re-engineered to take advantage of Sugar's advanced collaboration abilities
    See these instructions: How to sugarize an application: [1]

Sugar Coating Activities

To run Linux apps under Sugar (i.e., making them to run in the Sugar interface, without the collaboration and other Sugar integration programmed into them), read these instructions on Running Linux Applications Under Sugar.

In the future, we hope that Sugar will be able to run Linux applications natively without these steps.

Sugarizing Activities

See Activity Team for information on porting regular applications to run as native Sugar Activities.

Sugar Coating

Many standard GNU/Linux programs can be run within Sugar, but without the collaboration and other Sugar integration programmed into them. The process of adding an icon to the Sugar Activities panel is called "Sugar Coating".

A simple script to automate the process was created by a woman named CatMoran. The script:

  • has be confirmed to work with Firefox, Seamonkey, Midnight Commander, TuxType2, TuxPaint and Totem. It it presumed to work with many other GNU/Linux programs.
  • only works with programs that use the same command every time (i.e., a single command with no qualifiers). It doesn't work for roto's current mplayer configuration, because the mplayer command requires an input file name to start the program.
Warning.png
NOTE:
The procedure outlined below may not work for some versions of Sugar and Fedora. For example on F11 / S0.84 and newer activities sugarized this way crash X.org in some conditions with a BadWindow error. A workaround is to obtain the source to libsugarize.c and build libsugarize.so from it -- see http://dev.laptop.org/git/users/albert/sugarize/ . Also recommended: the shell version of 'sugarize', at http://lists.laptop.org/pipermail/devel/2008-January/009387.html
Some tests with Sugar 0.96.2 were successfull (see this comment).

To setup (one time):

  1. Start a Terminal activity.
  2. Enter the following commands:
    3. mkdir sugarize wget http://dl.dropbox.com/u/1203534/sugarize/libsugarize.so chmod 755 libsugarize.so wget http://dl.dropbox.com/u/1203534/sugarize/sug chmod 755 sug (What do those commands do? They log you in as root, gets a copy of Albert Cahalan's compiled libsugarize file, and gets the script CatMoran created, modified by akiwiguy.) Next, run this: vi sug and change the CREATEPATH variable to /home/$yourusernamehere/Activities Optional, if you want to use one of the icons CatMoran created: wget http://ia341002.us.archive.org/3/items/Sugarize/plain.svg wget http://ia341002.us.archive.org/3/items/Sugarize/ff.svg wget http://ia341002.us.archive.org/3/items/Sugarize/l.svg

To Run (once per program that you want to Sugar Coat):

  1. Locate an icon you want to use/reuse.
    • You can copy any .svg file located in /usr/share/activities/*.activity/activity/*.svg
    • Or you can use one of the icons CatMoran created--and downloaded using the wget commands listed above. plain.svg is a plain circle, ff.svg is a circle with the letters FF (for Firefox) inside, l.svg is a circle with the single letter L inside. Both of the latter files can be easily edited using any text editor and one or both character(s) changed. Each letter is in plain text just before the </tspan> tags, replace them and save the file.
  2. Enter the following commands, to log in as root and execute the sug script. T quit the script at any time, just enter nothing at the prompt and hit the Enter button.
        • In Uruguay, the XO laptops do not allow you to login as root because LATU have blocked this.
    Please offer a alternative way, maybe using a Linux PC. -- alejandro.lavarello (at) gmail (dot) com *** Fixed, don't need root privleges now. Akiwiguy 06:39, 18 September 2010 (EDT) ./sug First, you'll be prompted for an activity name. Enter a short, descriptive name with no spaces or punctuation, such as BibleTime, Firefox, or MC. Second, you'll be prompted for an icon file to copy into the new task. Enter the full path and filename of any .svg file. If the icon is in the same directory as the sug file, you can enter just the filename. Next, you'll be prompted for the command to start the program. This is the command you type at the Terminal prompt to start the program, such as firefox, totem, or mc. Finally, you'll be prompted for an organization path, such as org.mozilla If you don't know what this is, just enter org.x The script will give you a success message. Reboot Sugar by pressing Ctrl-Alt-Erase (the Control, Alt and Erase buttons) at the same time. When Sugar restarts you will now see the new icon in the Sugar taskbar. A simple click on the icon will start the newly Sugar Coated program, like any other Sugar Activity.

Sugar Coat Script Mirror Servers


Local storage of needed files:http://people.sugarlabs.org/Tgillard/sugarize/ with permission from Albert Cahalan.

Comments

Look at: http://people.sugarlabs.org/Tgillard/sugarize/wiki-sugarize.txt

I haven't been able to get this to work in Update.1 --leetcharmer

Rob - I modified the script to work in Update 1 for SeaMonkey, but it requires an effective disabling of security. The crux of the problem is that Rainbow 1) runs your application as a totally new user each time (never as "olpc"), 2) these "on-the-fly" users don't have write access to their home directories, and 3) these "on-the-fly" users are destroyed on reboot. All of these users are created in the same persistent group, and all share write access to a common "data" directory for the group. (The preceding is just a paraphrase of the Rainbow docs - should likely be a link). In the case of non-Sugar apps, the application has no idea that the usual role of a user has been migrated to a group, and so the application is unlikely to create it's data files with the correct permissions. Further, since the "on-the-fly" users are destroyed on each reboot, if the username appears in persistent data (e.g., absolute pathnames), the application will fail after a reboot. All of these issues are addressed in the following for the SeaMonkey application.

Note Well: The following instructions essentially remove all security on your machine. If you have set passwords on any of the machine accounts (root, olpc, etc.), likely you don't want to execute these instructions. 

[olpc@xo ~]$ su
[olpc@xo ~]# chmod a+s /bin/chmod

These lines allow any user to change permissions on any file and/or directory in the system. Therefore, having something only readable / executable by root is no longer a protection, since an unprivileged user can just change the permissions. In my case, I couldn't lose what I didn't have -- I have no password for the root or olpc users, so there was no effective change.

In general sudo would be a more graceful approach to this problem, but I couldn't get it to work in a script (first, you need to allow all uids > 10000; second, you need it to not prompt for a password; and third, su can't be invoked from a Sugar script because stdin is not a tty, even if no password is required).

After using the above to allow the Rainbow "on-the-fly" users to change permissions on files they don't own, we use the chmod ability in the script. The following script is just CatMoran's script with a few lines added at the beginning. Any other minor formatting changes are accidental and a result of my editing the file 100 times to try to find out why it wasn't working. I've only tested this script with SeaMonkey -- but I think similar ideas would work for other applications. 

#!/bin/sh

# Causes SeaMonkey to put the .mozilla directory in a
# place that is writable, and also where Rainbow wants
# it.  SUGAR_ACTIVITY_ROOT/data is not directly suitable
# since it contains a reference to a user that will 
# be destroyed on reboot, and SeaMonkey stores absolute 
# pathnames in its persistent data.
export HOME=`/bin/ls -l $SUGAR_ACTIVITY_ROOT/data | /usr/bin/awk '{ print $10 }'`

# libgnomevfs ignores the HOME environment variable,
# so make our actual home directory writable for the
# .gnome2 and .gnome2_private directories.
chmod g+w $SUGAR_ACTIVITY_ROOT

# SeaMonkey ignores umask and makes everything
# only user-accessible.  But, we're running as
# a different user each time.  So make everything
# in HOME group-accessible (at a minimum, make
# .mozilla and everything in it group-accessible).
chmod -R g+rwx $HOME/.*
chmod -R g+rwx $HOME/*

while [ -n "$2" ] ; do
     case "$1" in
         -b | --bundle-id)     export SUGAR_BUNDLE_ID="$2" ;;
         -a | --activity-id)   export SUGAR_ACTIVITY_ID="$2" ;;
         -o | --object-id)     export SUGAR_OBJECT_ID="$2" ;;
         -u | --uri)           export SUGAR_URI="$2" ;;
         *) echo unknown argument $1 $2  ;;
     esac
     shift;shift
done
export LD_PRELOAD="$SUGAR_BUNDLE_PATH/lib/libsugarize.so"
export NET_WM_NAME="SeaMonkey"
exec /usr/bin/seamonkey

Brian - To make this work for SoaS Release 1 (Sugar 0.84.2) the sug script needs to be updated. 

CREATEPATH=/home/liveuser/Activities/

Useful GNU/Linux Applications

VLC Media Player

The VLC media player is a highly portable multimedia player for various audio and video formats (MPEG-1, MPEG-2, MPEG-4, DivX, mp3, flv, avi, ogg, ...) as well as DVDs, VCDs, and various streaming protocols. It can also be used as a server to stream in unicast or multicast in IPv4 or IPv6 on a high-bandwidth network.; the VLC Player is considered to be better by some users then MPlayer because it offer more settings, options and features. There is also no need to run it from Terminal. Read Activities/VLC to learn how to install it.

Seamonkey

SeaMonkey has inherited the successful all-in-one concept of the original Netscape Communicator and continues that product line based on the modern, cross-platform architecture provided by the Mozilla project.

  • The Internet browser at the core of the SeaMonkey suite uses the same rendering engine as its sibling Mozilla Firefox, with popular features like tabbed browsing, popup blocking, find as you type and a lot of other functionality for a smooth web experience.
  • SeaMonkey's Mail and Newsgroups client shares lots of code with Mozilla Thunderbird and features adaptive Junk mail filtering, labels and mail views, multiple accounts, S/MIME, address books with LDAP support and is ready for both private and corporate use.
  • Additonal components include an easy-to-use HTML Editor, the ChatZilla IRC chat application and web development tools like a DOM Inspector and a JavaScript debugger.
  • If that's still not enough, SeaMonkey can be extended with numerous Add-Ons that provide additional functionality and customization for a complete Internet experience.

Seamonkey can be Sugar-coated.

Midnight Commander

Midnight Commander is a text-mode file manager and visual command shell. It is easily Sugar-coated for access from the Activities panel. Screenshot You can also run it directly in Terminal. (Paper Writers)

Totem Media Player

The Totem media player is already installed in the OLPC XO-1. It is the engine that supports media on the system. Out of the box it does not support MP3 music or MPEG-4 video. A free driver can be downloaded to add MP3 compatability. A Sugar-coating can be applied to easily access the program from the Activities panel.

Tux4Kids

TuxType2
TuxType is a touch typing tutorial/game than can be installed on the OLPC XO-1 using the yum command. A Sugar-coating can be applied to easily access the program from the Activities panel.
TuxMath
TuxMath is an arcade game that helps kids practice their math facts. A Sugar-coating can be applied to easily access the program from the Activities panel.
TuxPaint
Tux Paint is a drawing program for children ages 3 to 12. It combines an easy-to-use interface, fun sound effects, and an encouraging cartoon mascot who guides children as they use the program. A Sugar-coating can be applied to easily access the program from the Activities panel.

Logo was Seymour Papert's language from the 1960s for children, originally providing Turtle Graphics by controlling a robot turtle. There is a large literature on using Logo to teach programming to children.

Turtle Art can produce Logo output, but we do not have a Logo activity in Sugar. UCBLogo is available in many Linux distributions, and can be installed (with yum on XOs, yum or apt tools on other Linuces) and run in Terminal. The command window opens a graphic window that the user can drag around. Entering turtle graphic commands at the command line then causes graphic output in the Logo window.

J

J is Turing Award winner Ken Iverson's last version of APL, his language for describing computers and algorithms, designed originally for human use, not as a programming language. In order to avoid the controversy that surrounded the APL character set and keyboard layouts, J uses only ASCII. J Software, Iverson's company, put a version of J under GPL3 in March 2011. It can be installed and run from the command line. A Debian package is in preparation.

Iverson successfully used APL to teach arithmetic to first-graders on a loaned IBM 360 with Selectric printing terminals using APL typeballs. He wrote a book on teaching Arithmetic, published by APL Press but now out of print. Mokurai is preparing to add it to the Replacing Textbooks server.

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