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Avoiding wxPython PrintPreview segmentation fault or double free error

Posted 11-28-2008 at 08:23 PM by dr_agon

applies to: Python, wxPython (v.2.8), wxWidgets, wx.PrintPreview, wx.Printout

When creating wx.PrintPreview class, you must pass 2 parameters of wxPrintout class (see doc)
If someone (like me) gets a silly idea of passing the same instance of wxPrintout class as both parameters, on closing the preview frame he will get segmentation fault or double free error.
Example (don't do this!):

Code:

class MyPrintout(wx.Printout):
  
  #rest of code

...

dr_agon

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Setting udev permission for raw host disk access by virtualbox machine.

Posted 10-14-2008 at 09:02 AM by dr_agon

applies to: linux, udev, permissions, device node, virtualbox

To allow raw host disk access by guest machine on VirtualBox the user must have read-write permission to all partitions which are to be accessed. You can do this by something like

Code:

sudo chmod a+rw /dev/sda7

but executing it every time you need to boot virtual machine is annoying. You may want to set the permissions at boot time.
In modern kernels (since 2.6) you can use the udev rules for setting default...

dr_agon

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How to remove selected messages left on the POP3 server.

Posted 10-13-2008 at 04:46 PM by dr_agon

applies to: KMail, Evolution, Perl, POP3, mail client

Unfortunatelly my favourite mail client (Kmail) cannot leave messages on the POP3 server while retrieving them and delete them later, eg. when they are moved to 'Trash" folder (like Thunderbird). The same applies to Evolution. Of course I know there are IMAP servers, but that's not the solution I like most. I also did not want to periodically erase all messages left on POP3 server. I did not find any reasonable solution, so...

dr_agon

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CVS diff default behavior

Posted 10-13-2008 at 03:55 PM by dr_agon

applies to: linux, cvs, diff

I spent some time wondering why cvs diff does not show the local files which differ from the most recent revision. It turned out that this is simply the default behavior, as described in man page:

Quote:

The default action is to compare your working files with the revisions they were based on

To see differences with other revision, you must use -D or -r option.
For example to compare with newest revisions:

Code:

cvs diff --brief -D now

...

dr_agon

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How to allow ordinary (not root) users to mount/unmount everything.

Posted 10-06-2008 at 01:50 PM by dr_agon

applies to: linux, debian based (Mepis), mount, sudo

While testing many things often I have to mount/unmount resources, and I became tired of using 'su' and supplying password.

The easy but not very secure solution is to allow some (or all) users to execute mount/unmount as root without being prompted for password by adding them to /etc/sudoers file like this:

Code:

%users  ALL=NOPASSWD: /bin/mount, /bin/umount

'users' is a group name.
Now I can use...

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