Building image fails on btrfs due to mkfs.erofs xattr limitation

Building image fails on btrfs due to mkfs.erofs xattr limitation

[Demi Marie Obenour]

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Unless extended attributes are disabled (with -x-1), mkfs.erofs
fails when the source is a BTRFS filesystem.  This prevents the
Spectrum image from being built.  Using -x-1 seems to produce a
working installer, though I only smoke tested it (by trying the
example VMs).
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)

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Re: Building image fails on btrfs due to mkfs.erofs xattr limitation

[Alyssa Ross]

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Demi Marie Obenour <demiobenour@gmail.com> writes:

> Unless extended attributes are disabled (with -x-1), mkfs.erofs
> fails when the source is a BTRFS filesystem.  This prevents the
> Spectrum image from being built.  Using -x-1 seems to produce a
> working installer, though I only smoke tested it (by trying the
> example VMs).

That's odd — I frequently run mkfs.erofs on btrfs.  Could it be some
difference in our filesystem/mount options?  Could it just be that my
files don't have extended attributes and yours do (SELinux)?

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Re: Building image fails on btrfs due to mkfs.erofs xattr limitation

[Demi Marie Obenour]

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On 7/5/25 04:52, Alyssa Ross wrote:
> Demi Marie Obenour <demiobenour@gmail.com> writes:
> 
>> Unless extended attributes are disabled (with -x-1), mkfs.erofs
>> fails when the source is a BTRFS filesystem.  This prevents the
>> Spectrum image from being built.  Using -x-1 seems to produce a
>> working installer, though I only smoke tested it (by trying the
>> example VMs).
> 
> That's odd — I frequently run mkfs.erofs on btrfs.  Could it be some
> difference in our filesystem/mount options?  Could it just be that my
> files don't have extended attributes and yours do (SELinux)?

Yeah, it might well be SELinux.  Spectrum should still build on
systems with SELinux enabled, though.  Does Spectrum use extended
attributes?  If not, would it make sense to disable them with -x-1?
In the future, SELinux on the host will require fixing this, but
for now it's better to fix the build error.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)

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Re: Building image fails on btrfs due to mkfs.erofs xattr limitation

[Alyssa Ross]

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Demi Marie Obenour <demiobenour@gmail.com> writes:

> On 7/5/25 04:52, Alyssa Ross wrote:
>> Demi Marie Obenour <demiobenour@gmail.com> writes:
>> 
>>> Unless extended attributes are disabled (with -x-1), mkfs.erofs
>>> fails when the source is a BTRFS filesystem.  This prevents the
>>> Spectrum image from being built.  Using -x-1 seems to produce a
>>> working installer, though I only smoke tested it (by trying the
>>> example VMs).
>> 
>> That's odd — I frequently run mkfs.erofs on btrfs.  Could it be some
>> difference in our filesystem/mount options?  Could it just be that my
>> files don't have extended attributes and yours do (SELinux)?
>
> Yeah, it might well be SELinux.  Spectrum should still build on
> systems with SELinux enabled, though.  Does Spectrum use extended
> attributes?  If not, would it make sense to disable them with -x-1?
> In the future, SELinux on the host will require fixing this, but
> for now it's better to fix the build error.

Yes, of course.  I just wanted to understand why it might be happening
for you and not to me.  Disabling extended attributes in mkfs.erofs
sounds like the right thing to do.

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