Log excerpt: Warning: Permanently added '44.
Comment: The 'Finish(bootstrap): chroot init' means that Mock finalized bootstrap installation, so there's no problem.

Log excerpt: s-debuginfod-client-0.190-2.fc38.x86_64       
Comment: The "Finish: installing minimal buildroot with dnf" means that even the minimal buildroot was successfully initialized.

Log excerpt:               3/15 
  Installing       : dbus-libs-1:1.14.1
Comment: The "Start: build phase..." part means that Mock started building the source RPM.

Log excerpt:  specification file: sources
INFO: Downloading rebasehelper-0.28.
Comment: Source RPM has been successfully built.

Log excerpt: -time --show-error --fail --retry-all-errors https://copr-dist-git.fedorainfracloud.org/repo/pkgs/torsava/automatic-obsoletes/rebase-helper/rebasehelper-0.28.1.tar.gz/md5/fdabba9c959a7fc6566a5a6a75f672cb/rebasehelper-0.28.1.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1857k  100 1857k    0     0  43.2M      0 --:--:-- --:--:-- --:--:-- 44.2M
INFO: Reading stdout from command: md5sum rebasehelper-0.28.1.tar.gz

Running (timeout=18000): 
Comment: But `python3-sphinx_rtd_theme` from `copr_base` seems to require non-installable dependencies in buildroot.