Message-ID: <50902D13.5020206@bsmucker.eu.org>
Date: Tue, 30 Oct 2012 12:40:03 -0700
From: Brian Smucker <bds@bsmucker.eu.org>
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To: yocto@yoctoproject.org
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Subject: Re: supported IMAGE_FSTYPES
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 From a yocto also-newbie:

This is a helpful command: bitbake -e |grep xxx
where xxx is something like ^IMAGE_FSTYPE=

That retrieves the current settings of that variable.

It doesn't answer your main question of what are the options.  I had 
that exact question a week or so ago.

Thanks

Brian

On 10/30/2012 11:08 AM, Tim Bird wrote:
> I am in the process of creating my own distro, and trying to figure out
> all the different build variables.  This is a pretty daunting task
> for a yocto project/Poky newbie.
>
> Is there some place where the possible values for IMAGE_FSTYPE are
> documented?  The Poky reference manual has this helpful sentence:
> "Formats of root filesystem images that you want to have created."
> However, it does not describe the possible values this variable
> should have.
>
> At the root of the poky source dir, doing a 'find -type f -print 0 | xargs -0 grep IMAGE_FSTYPES'
> seems to reveal the following used or checked-for image types:
>   jffs2 sdimg tar.bz2 ubi ext3 ext2 cpio.gz live vmdk
>
> It appears the cpio.gz corresponds to an image suitable for an initramfs.
> jffs2, ext2, ext3, ubi and tar.bz2 appear self-explanatory.
> I have a pretty good idea that vmdk is somehow related to the
> virtual build image.
>
> What does 'live' do?
>
> Wait a sec...
>
> Reading meta/classes/image_types.bbclass I just found IMAGE_TYPES,
> which says it is "available to request which values are suitable
> for IMAGE_FSTYPES".
>
> This has the following definition in denzil:
> IMAGE_TYPES = "jffs2 sum.jffs2 cramfs ext2 ext2.gz ext2.bz2 ext3 ext3.gz
> ext2.lzma btrfs live squashfs squashfs-lzma ubi tar tar.gz tar.bz2 tar.xz
> cpio cpio.gz cpio.xz cpio.lzma vmdk"
>
> How does one query this variable?  Other than reading the source, is
> there a way to know that such variables (which list the allowed values
> for other variables) exist?
>
> I apologize if these are newbie questions.
>
> Thanks,
>   -- Tim
>
> =============================
> Tim Bird
> Architecture Group Chair, CE Workgroup of the Linux Foundation
> Senior Staff Engineer, Sony Network Entertainment
> =============================
>
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