Bug#1071462: installing/upgrading libc6 does not work in sbuild when systemd is installed as ischroot declines

[Johannes Schauer Marin Rodrigues]

Hi,

Quoting Aurelien Jarno (2024-05-20 11:49:32)
> > > > That's all legacy stuff and I really don't want to touch it anymore.
> > > > Going from the other side, maybe libc6.postinst could use something
> > > > more reliable than ischroot()? Is systemd-detect-virt able to figure
> > > > out the situation a bit better?
> > > Nope.
> > What's the output? With SYSTEMD_LOG_LEVEL=debug exported
> In sbuild using unshare chroot running in a VM:
> 
> | SYSTEMD_LOG_LEVEL=debug /usr/bin/systemd-detect-virt
> | Failed to read $container of PID 1, ignoring: Permission denied
> | Found cgroup2 on /sys/fs/cgroup/, full unified hierarchy
> | Found container virtualization none.
> | Virtualization QEMU found in DMI (/sys/class/dmi/id/sys_vendor)
> | UML virtualization not found in /proc/cpuinfo. 
> | Virtualization XEN not found, /proc/xen does not exist
> | Virtualization found, CPUID=KVMKVMKVM
> | Found VM virtualization kvm
> | kvm

would it help (and be correct) if PID 1 in sbuild unshare mode would have the
"container" environment variable set to something? And/or if sbuild unshare
mode would create the file /run/systemd/container with some content?

I'd need input from somebody who knows how containers (if this is one) are
supposed to work. :)

Thanks!

cheers, josch
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