failed to create a centos8 LXC container on centos8

[f18m]

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Feel free to remove anything which doesn't apply to you and add more information where it makes sense.

Required information

• Distribution: Centos
• Distribution version: 8.0.1905
• The output of
  • lxc-start --version: 3.2.1
  • uname -a: Linux arkadia 4.18.0-80.7.1.el8_0.x86_64 Prefix tests with lxc-test- lxc#1 SMP Sat Aug 3 15:14:00 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

Issue description

I installed LXC3 on Centos8 using:
https://copr.fedorainfracloud.org/coprs/ganto/lxc3/

and then tried to run:

root@arkadia ~]# lxc-create -n test2 -t centos -- -R 8 
Host CPE ID from /etc/os-release: cpe:/o:centos:centos:8
Checking cache download in /var/cache/lxc/centos/x86_64/8/rootfs ... 
Downloading CentOS minimal ...
Failed to set locale, defaulting to C
Failed to set locale, defaulting to C
Unable to detect release version (use '--releasever' to specify release version)
CentOS-8 - Base                                                                              36  B/s |  38  B     00:01    
Error: Failed to synchronize cache for repo 'base'
Reinstalling packages ...
mkdir: cannot create directory '/var/cache/lxc/centos/x86_64/8/partial/etc/yum.repos.disabled': File exists
mv: cannot stat '/var/cache/lxc/centos/x86_64/8/partial/etc/yum.repos.d/*.repo': No such file or directory
mknod: /var/cache/lxc/centos/x86_64/8/partial//var/cache/lxc/centos/x86_64/8/partial/dev/null: File exists
mknod: /var/cache/lxc/centos/x86_64/8/partial//var/cache/lxc/centos/x86_64/8/partial/dev/urandom: File exists
cp: cannot stat '/var/cache/lxc/centos/x86_64/8/partial/var/cache/yum/*': No such file or directory
chroot: failed to run command 'yum': No such file or directory
Failed to download the rootfs, aborting.
Failed to download 'CentOS base'
failed to install CentOS
lxc-create: test2: lxccontainer.c: create_run_template: 1648 Failed to create container from template
lxc-create: test2: tools/lxc_create.c: main: 331 Failed to create container test2

Steps to reproduce

1. Step one: get a centos8 minimal
2. Step two: install copr and lxc3 from ganto/lxc3 COPR repo
3. Step three: try to create a centos8 container

[f18m]

From a first debugging the problem looks to be wrong repository names: if I cat the file mentioned by the lxc-create, i.e.
/var/cache/lxc/centos/x86_64/8/partial/etc/yum.repos.d/lxc-centos-temp.repo

I find it contains:
mirrorlist=http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=os
which does not work; the right setting is instead:
mirrorlist=http://mirrorlist.centos.org/?release=8&arch=x86_64&repo=BaseOS