Re: [ptxdist] root.ext2

[Michael Olbrich <m.olbrich@pengutronix.de>]

Hi,

On Sun, May 07, 2017 at 05:56:40PM +0200, Clemens Gruber wrote:
> I noticed that the image-root-ext and image_ext2 rule still uses
> genext2fs to first create an ext2 filesystem and then uses tune2fs to
> convert it to ext3 and subsequently to ext4.
> 
> I think it is time to create ext4 images directly, otherwise we can't
> use features like flex_bg and extra_isize because they need to be
> specified at the time of creation.
> 
> To create the images, we could use make_ext4fs from the Android project
> or (probably better) the standalone fork from the LEDE project:
> https://git.lede-project.org/?p=project/make_ext4fs.git;a=summary
> 
> What do you think about this?

mkfs.ext4 in the current version can add content to the filesystem. So that
is the way to go. I started a patch for genimage to use it, but so far I'm
lacking the time to finish this.
The main problem is, that mkfs.ext4 checks /etc/mke2fs.conf by default and
looks up some stuff in /proc when deciding what to do. So it's a bit tricky
to make sure that the build host does not influence the creation of the
image.

Regards,
Michael

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

_______________________________________________
ptxdist mailing list
ptxdist@pengutronix.de