Re: Unable to build cdrom: failed to setup loop device

[Robin Roevens <robin.roevens@disroot.org>]

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Hi Michael

Michael Tremer schreef op wo 04-09-2024 om 21:38 [+0200]:
> Hello Robin,
> 
> > On 4 Sep 2024, at 20:53, Robin Roevens <robin.roevens(a)disroot.org>
> > wrote:
> > 
> > Hi all
> > 
> > While trying to build ipfire, which always has worked quite
> > effortless,
> > it now fails while building cdrom:
> > 
> > ---
> >    # Create the EFI Eltorito image
> >    dd if=/dev/zero of=/tmp/cdrom/boot/isolinux/efiboot.img bs=1k
> > count=2880
> >    2880+0 records in
> >    2880+0 records out
> >    2949120 bytes (2.9 MB, 2.8 MiB) copied, 0.00453183 s, 651 MB/s
> >    mkdosfs -F 12 -n "IPFIRE_EFI"
> > /tmp/cdrom/boot/isolinux/efiboot.img
> >    mkfs.fat 4.2 (2021-01-31)
> >    # Mount the EFI image
> >    mkdir -pv /tmp/efiboot.img
> >    mkdir: created directory '/tmp/efiboot.img'
> >    mount -o loop /tmp/cdrom/boot/isolinux/efiboot.img
> > /tmp/efiboot.img
> >    mount: /tmp/efiboot.img: failed to setup loop device for
> > /tmp/cdrom/boot/isolinux/efiboot.img.
> >    make: *** [cdrom:184: /usr/src/log/cdrom] Error 32
> >    make: Leaving directory '/usr/src/lfs'
> > 
> > ERROR: Building
> > cdrom                                                 
> > [ FAIL ]
> >    Check /home/robin/src/ipfire-sandbox/ipfire-
> > 2.x/log_x86_64/_build.ipfire.log for errors if
> > applicable             
> > [ FAIL ]
> > ---
> 
> What is the output of “losetup” after this fails?

Just a list snap files mounted by snapd. Nothing from ipfire.


> 
> > The logfile has no extra or new information.
> > 
> > When I manually try those steps, as root (as make.sh is also ran as
> > root (using sudo)), they work correctly, and I'm able to
> > successfully
> > mount the image.
> 
> Does this also work in shell?

Yes, it works also in a root shell.

> 
> > 
> > ---
> > $ sudo dd if=/dev/zero of=./efiboot.img bs=1k count=2880 
> > 2880+0 records gelezen
> > 2880+0 records geschreven
> > 2949120 bytes (2,9 MB, 2,8 MiB) gekopieerd, 0,0130511 s, 226 MB/s
> > $ sudo ./build/sbin/mkdosfs -F 12 -n "IPFIRE_EFI" ./efiboot.img
> > mkfs.fat 4.2 (2021-01-31)
> > $ sudo mkdir ./efi
> > $ sudo mount -o loop ./efiboot.img ./efi
> > $ df -h
> > ./efi                                                         
> > Bestandssysteem Grootte Gebruikt Besch Geb% Aangekoppeld op
> > /dev/loop15        2,8M        0  2,8M   0% /home/robin/src/ipfire-
> > sandbox/ipfire-2.x/efi
> > ---
> > 
> > So I'm unsure as of why the build fails setting up the loop device.
> > I did a ./make.sh clean, but that didn't solve it.
> > 
> > If I try to mount the loop device as unprivileged user, I get the
> > exact
> > same error. But the build process is ran as root, so that should
> > also
> > not be the problem?
> 
> It creates new namespaces in which root is less privileged than in
> the first namespace.

Can it be that there is some leftover somewhere from older builds when
it had more privileges? Not that I can imagine what could still be
there that it now prevents mounting a freshly created file on loopback.

> 
> > Has anyone an idea what could be wrong here? or give me some
> > guidelines
> > on how to debug this ? 
> > I've read there where changes to the inner workings of the build
> > system, could those be the cause ? I assume not as then I would
> > have
> > seen others complain about it here?
> 
> Apart from that, as Adolf requested, please provide us with some more
> information about your kernel and distribution.

I'm running openSUSE Tumbleweed on kernel 6.10.5.

> 
> -Michael
> 
> > Robin
>