Comment 2 for bug 667817

Hi,
First sorry for my poor English.
yesterday i tried to find an approach to solve the problem with "hard coded ext3 filesystem" in euca2ool/__init__.py.
My first reflexion was to write a function that get Informations about the filesystem of the Instance then Overrides the "global hard coded" variable in Euca2ools/__init__.py ( NEW_FSTAB, OLD_FSTAB and MAKEFS_CMD )
So this function could be call in def make_fs(self, image_path ) to Update the filesytem type.
Even i think that ALLOWED_FS_TYPES = ['ext2', 'ext3', 'xfs', 'jfs', 'reiserfs'] should containt an "ext4" Entry.

But after reading this post https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/665235/comments/4 about /dev/sda1
i'm not sure anymore, that it is a good approach to solve it, since the Hard drive names are not the same on all Systems (/dev/sdax or /dev/vsda or /dev/sdh ??????)

I wrote a small "stand alone" Test file ( Just with the "Hard coded variables" and an update function) to illustrate what i mean.

Is it the right way to look for a solution to this problem?
The code looks a bit curious, since i'm not a Python Programmer.

Thanks

Raymdt