2021-06-18 09:20:18,146 [INFO] {2633} koji.build.buildroot:541 Running mock as kojibuilder
ERROR: Option --old-chroot has been deprecated. Use --isolation=simple instead.
INFO: mock.py version 2.8 starting (python version = 3.6.8, NVR = mock-2.8-1.el8)...
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
Start: clean chroot
Finish: clean chroot
Start(bootstrap): chroot init
INFO: calling preinit hooks
INFO: enabled HW Info plugin
Mock Version: 2.8
INFO: Mock Version: 2.8
Start(bootstrap): dnf install
Finish(bootstrap): dnf install
Finish(bootstrap): chroot init
Start: chroot init
INFO: calling preinit hooks
INFO: enabled HW Info plugin
Mock Version: 2.8
INFO: Mock Version: 2.8
Start: dnf install
ERROR: Command failed: 
 # /usr/bin/dnf --installroot /var/lib/mock/dist-an8.4-build-20321-8902/root/ --setopt=deltarpm=False --allowerasing --disableplugin=local --disableplugin=spacewalk groupinstall build
Unable to detect release version (use '--releasever' to specify release version)
No matches found for the following disable plugin patterns: local, spacewalk
Errors during downloading metadata for repository 'build':
  - Curl error (7): Couldn't connect to server for http://172.16.0.137/kojifiles/repos/dist-an8.4-build/8902/x86_64/repodata/repomd.xml [Failed to connect to 172.16.0.137 port 80: Connection refused]
Error: Failed to download metadata for repo 'build': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried