bootstrap image not working in podman

[hroncok]

Short description of the problem

Following the guide at https://rpm-software-management.github.io/mock/#mock-inside-podman-fedora-toolbox-or-docker-container I am unable to run mock:

$ podman run --rm --privileged -ti fedora:40 bash
[root@2f26bd11c076 /]# dnf install -y mock
...
[root@2f26bd11c076 /]# useradd mockbuilder
[root@2f26bd11c076 /]# usermod -a -G mock mockbuilder
[root@2f26bd11c076 /]# su - mockbuilder
[mockbuilder@2f26bd11c076 ~]$ mock -r fedora-rawhide-x86_64 install python3.13
INFO: mock.py version 5.6 starting (python version = 3.12.3, NVR = mock-5.6-1.fc40), args: /usr/libexec/mock/mock -r fedora-rawhide-x86_64 install python3.13
Start(bootstrap): init plugins
INFO: selinux disabled
Finish(bootstrap): init plugins
Start: init plugins
INFO: selinux disabled
Finish: init plugins
INFO: Signal handler active
Start: run
Mock Version: 5.6
INFO: Mock Version: 5.6
Start(bootstrap): chroot init
INFO: calling preinit hooks
INFO: enabled root cache
INFO: enabled package manager cache
Start(bootstrap): cleaning package manager metadata
Finish(bootstrap): cleaning package manager metadata
INFO: Guessed host environment type: unknown
INFO: Using bootstrap image: registry.fedoraproject.org/fedora:rawhide
INFO: Pulling image: registry.fedoraproject.org/fedora:rawhide
ERROR: Error: configure storage: kernel does not support overlay fs: unable to create kernel-style whiteout: no such file or directory

INFO: Pulling image: registry.fedoraproject.org/fedora:rawhide
ERROR: Error: configure storage: kernel does not support overlay fs: unable to create kernel-style whiteout: no such file or directory

INFO: Pulling image: registry.fedoraproject.org/fedora:rawhide
ERROR: Error: configure storage: kernel does not support overlay fs: unable to create kernel-style whiteout: no such file or directory

INFO: Pulling image: registry.fedoraproject.org/fedora:rawhide
ERROR: Error: configure storage: kernel does not support overlay fs: unable to create kernel-style whiteout: no such file or directory

INFO: Pulling image: registry.fedoraproject.org/fedora:rawhide
ERROR: Error: configure storage: kernel does not support overlay fs: unable to create kernel-style whiteout: no such file or directory

INFO: Pulling image: registry.fedoraproject.org/fedora:rawhide
ERROR: Error: configure storage: kernel does not support overlay fs: unable to create kernel-style whiteout: no such file or directory

^CERROR: Exiting on user interrupt, <CTRL>-C

The guide should probably be updated to suggest --no-bootstrap-image... or something else?

[praiskup]

Thank you for the report - this will be fixed in the next Mock release, see #1381. Install fuse-overalyfs in the container.

Pre-release Mock: https://copr.fedorainfracloud.org/coprs/g/mock/mock