8a3fad2891
Why I did it
Ubuntu 22.04 uses cgroup2 by default, but docker.sh doesn't mount it.
As a result we get an error when trying to run docker info in chroot env:
ERROR: Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
How I did it
mount cgroup2 in chroot if all enabled kernel cgroup controllers are currently not in use by cgroup1
So we need to mount cgroup in chroot environment on /sys/fs/cgroup.
Because inside chroot we don't know which cgroup version is used by the host we have two possible solutions:
cgroup tree for chroot is mounted by the host (it was my 1st version of this fix)
cgroup tree is mounted inside chroot based on info from /proc/cgroups (it's current version of this fix)
My 2nd version based on this code from systemd:
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| .. | ||
| Aboot | ||
| apt | ||
| build_scripts | ||
| build_templates | ||
| dhcp | ||
| docker | ||
| image_config | ||
| initramfs-tools | ||
| scripts | ||
| sshd | ||