On 11/12/2012 07:47 PM, Anna wrote:
Just throwing this out, but incron might be something to look into. For
example, I've set up root's incrontab so that if a specific file is
modified, a script automatically runs with root permissions.
You could set root's incrontab up to watch /run/media/olpc/ and when a
directory is created there (i.e. any USB drive is automounted), incron
would call your script and run it as root.
Again, just brainstorming here. I won't be offended if someone says
that's a terrible idea.
Anna Schoolfield
Birmingham
On Mon, Nov 12, 2012 at 6:09 PM, Adam Holt <h...@laptop.org
<mailto:h...@laptop.org>> wrote:
Thanks Tony..adding a couple others involved too :)
On 11/12/2012 6:59 PM, Tony Anderson wrote:
Hi,
First, usbmount is the software that mounts a removable drive.
So I would think Fedora is replacing it with an alternative
(some software has to perform that function). CentOS is still
using usbmount.
Usbmount provided for a script to be installed by the
administrator that would be run whenever a removable drive was
mounted. Daniel Drake uses this to execute a series of XS
specific scripts (these scripts were developed for OLE Nepal and
are not in XS-0.7). The scripts he developed for OLE Nepal look
at the mounted drive and checks for the presence of specific
folders. If these folders are present then a corresponding
script is executed.
So there are two approaches going forward:
1. Implement the capability on the usbmount replacement.
2. Execute a script via ssh from an XO, a url, or even direct
access for a school server on the teacher's XO.
I am planning to use a 'generic script' on the server:
if [ -f "$UM_MOUNTPOINT"/XC/xc-install ]; then
log notice "Installing XC"
cd $UM_MOUNTPOINT/XC
if bash xc-install; then
log notice "XC installed successfully"
else
log notice "XC install failed with code $?"
error_beep
fi
fi
Essentially it tests whether the drive has a folder XC with a
file xc-install., if so it is executed. If not, nothing happens.
The xc-install script is on the mounted drive and does whatever
is needed.
XC is the counterpart to XO and XS and refers to the content for
the school server (XS being the software). This isn't hard and
fast. The XC script can (and does) add packages (e.g. mediawiki
or django) not in XS-0.7. Of course, it can also change the
server configuration.
The script needs to be run with root privileges. In Sridhar's
scenario this could be a bit tricky. I set up the school server
for login by admin by password and su to root (requiring another
password). This works well when you have itinerant technical
support who may need to administer school servers at many
different sites. If a teacher is to accomplish this, it would
probably be easiest to arrange for the teacher to login via a
public/private key pair and be given root privileges.
It would be relatively easy to give the teacher's laptop a
special menu line in the XO icon or in the console so that no
command line interface would be needed. Essentially I am doing
this sort of change with a script which works after the XO
install (it could, of course, also be baked into the build). In
the latter case, all of the laptops would have the extra menu
line so the school server could be configured only to accept the
teacher's click (e.g. identify teacher by serial-number so that
only the teacher's public key would match).
Tony
--
Help kids everywhere map their world, at http://olpcMAP.net !
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