[Libguestfs] virt-builder fails in fedora 34 container:

Mon Jun 14 08:57:00 UTC 2021

On Sun, Jun 13, 2021 at 11:15:31PM +0300, Nir Soffer wrote:
>On Sun, Jun 13, 2021 at 1:38 PM Richard W.M. Jones <rjones at redhat.com> wrote:
>>
>> On Sat, Jun 12, 2021 at 11:11:22PM +0300, Nir Soffer wrote:
>> > I'm running this inside a fedora 34 container in ovirt-imageio CI:
>> >
>> >     'virt-builder', '-v', '-x', 'cirros-0.3.5', '--write',
>> > '/etc/cirros-init/config:DATASOURCE_LIST="nocloud"',
>> > '--root-password', 'password:', '-o',
>> > '/var/tmp/imageio-images/cirros-0.3.5'
>> >
>> > The command fails in:
>> >
>> > supermin: ext2: copying kernel modules
>> > supermin: ext2: creating minimal initrd
>> > '/var/tmp/.guestfs-0/appliance.d.t7nny0l7/initrd'
>> > supermin: exception:
>> > Sys_error("/lib/modules/5.12.9-300.fc34.x86_64/modules.dep: No such
>> > file or directory")
>>
>> We use this file in order to construct the minimal initrd with some
>> virtio modules, which is sufficient to bring up the supermin root
>> filesystem.  The file itself is used to calculate the correct set of
>> module dependencies (so that, for example, if a virtio kmod needs
>> another kmod then the other kmod will be pulled in).  See:
>>
>> https://github.com/libguestfs/supermin/blob/c89e4923909ef84541ac1c047bf64d13b1595b4f/src/format_ext2_initrd.ml
>>
>> I believe in Fedora the file is created via a %post script in
>> kernel-core which runs /bin/kernel-install (from systemd-udev).  This
>> in turn is a shell script which runs snippets from
>> /etc/kernel/install.d and /usr/lib/kernel/install.d which are supplied
>> from all kinds of other packages.  On my machine one of these is
>> /usr/lib/kernel/install.d/50-depmod.install (also from systemd-udev)
>> which eventually runs depmod -a which creates this file.
>>
>> So those are some of the packages which might be missing.  Does
>> modules.dep get created anywhere inside the container?  It's possible
>> it moved.
>>
>> It's also possible to set the environment variable KERNEL_INSTALL_VERBOSE=1
>> which should show (in the dnf install output I guess?) if/when the
>> depmod command runs.
>>
>> > I think I'm missing some package removed from the fedora 34 container,
>> > but I don't have
>> > any idea which one.
>> >
>> > I hope someone has more insight on this.
>>
>> It's curious that things have changed since F33.  Could you build
>> containers for both and diff the list of package names?  Maybe a
>> dependency is missing or has become a soft dep.
>>
>> rpm -qa --qf '%{name}\n' | sort
>
>I ran this:
>
>$ podman run -it --rm quay.io/ovirt/imageio-test-fedora-34 rpm -qa
>--qf '%{name}\n' | sort > fedora-34.out
>$ podman run -it --rm quay.io/ovirt/imageio-test-fedora-33 rpm -qa
>--qf '%{name}\n' | sort > fedora-33.out
>$ diff -u fedora-33.out fedora-34.out > fedora.diff
>$ egrep -- ^- fedora.diff > removed-in-fedora-34
>$ egrep -- '^[+]' fedora.diff > added-in-fedora-34
>
>$ cat removed-in-fedora-34
>--- fedora-33.out 2021-06-13 22:51:13.156150245 +0300
>-autogen-libopts
>-genisoimage
>-iptables
>-isl
>-kbd-legacy
>-libcbor
>-libdb-utils
>-libfido2
>-libguestfs-tools-c
>-libmodman
>-libusal
>-nmap-ncat
>-pciutils
>-pciutils-libs
>-python3-idna
>-rdma-core
>-selinux-policy-minimum
>
>$ cat added-in-fedora-34
>+++ fedora-34.out 2021-06-13 22:50:59.650016271 +0300
>+guestfs-tools
>+inih
>+iptables-legacy
>+iptables-legacy-libs
>+langpacks-core-en_GB
>+langpacks-en_GB
>+libbsd
>+libcanberra
>+libcanberra-gtk3
>+libcloudproviders
>+libpmemobj
>+libretls
>+libtdb
>+netcat
>+pcsc-lite-libs
>+selinux-policy-targeted
>+sound-theme-freedesktop
>
>I don't see anything that can explain the difference.
>
>I also compared contents of the /lib/modules/xxx/ directories:
>
>$ podman run -it --rm quay.io/ovirt/imageio-test-fedora-33 ls -1
>/lib/modules/5.12.9-200.fc33.x86_64 >
>fedora-33-lib_modules_5.12.9-200.fc33.x86_64.out
>$ podman run -it --rm quay.io/ovirt/imageio-test-fedora-34 ls -1
>/lib/modules/5.12.9-300.fc34.x86_64 >
>fedora-34-lib_modules_5.12.9-300.fc34.x86_64.out
>$ diff -u fedora-33-lib_modules_5.12.9-200.fc33.x86_64.out
>fedora-34-lib_modules_5.12.9-300.fc34.x86_64.out
>--- fedora-33-lib_modules_5.12.9-200.fc33.x86_64.out 2021-06-13
>23:12:04.177539132 +0300
>+++ fedora-34-lib_modules_5.12.9-300.fc34.x86_64.out 2021-06-13
>23:12:18.072675988 +0300
>@@ -3,23 +3,14 @@
> build
> config
> kernel
>-modules.alias
>-modules.alias.bin
> modules.block
> modules.builtin
> modules.builtin.alias.bin
>-modules.builtin.bin
> modules.builtin.modinfo
>-modules.dep
>-modules.dep.bin
>-modules.devname
> modules.drm
> modules.modesetting
> modules.networking
> modules.order
>-modules.softdep
>-modules.symbols
>-modules.symbols.bin
> source
> symvers.gz
> updates
>
>Looks like some post install step is missing on the fedora 34 container.
>

Just to be clear, that is on the ovirt/imageio container, not any usual
container out there.  No upstream fedora container has anything in /lib/modules
because it usually is pointless to distribute something that is not going to be
needed as the container is not coupled with any kernel because it runs on the
host one.

I tested upstream fedora:33 and fedora:34 and fedora-minimal:34 (with microdnf)
containers and all got modules.dep file from the kernel-(debug-)core package,
although it is not owned by the package, so it is clearly installed in a
postscript or similar.  So it has to be something like not installing the
package correctly in the imageio container image.

I've got a tiny hunch, so I must ask.  Is someone, by any stroke of misfortune,
using bazel for building that imageio container image?

Have a nice day.
Martin

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