2022-12-05 00:20:33,209 [INFO] {149095} koji.build.buildroot:560 Running mock as kojibuilder
ERROR: Option --old-chroot has been deprecated. Use --isolation=simple instead.
INFO: mock.py version 3.0 starting (python version = 3.6.8, NVR = mock-3.0-1.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
ERROR: Could not create dir /home/linux1/mockroot-cclinux8/module-ruby-3.1-9010020221204230336-5600d869-build-91563-37961-bootstrap/results. Error: [Errno 13] Permission denied: '/home/linux1/mockroot-cclinux8'
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/mockbuild/file_util.py", line 21, in mkdirIfAbsent
    os.makedirs(dirName)
  File "/usr/lib64/python3.6/os.py", line 210, in makedirs
    makedirs(head, mode, exist_ok)
  File "/usr/lib64/python3.6/os.py", line 210, in makedirs
    makedirs(head, mode, exist_ok)
  File "/usr/lib64/python3.6/os.py", line 220, in makedirs
    mkdir(name, mode)
PermissionError: [Errno 13] Permission denied: '/home/linux1/mockroot-cclinux8'
ERROR: 
Could not create output directory for built rpms. The directory specified was:
    /home/linux1/mockroot-cclinux8/module-ruby-3.1-9010020221204230336-5600d869-build-91563-37961-bootstrap/results

Try using the --resultdir= option to select another location. Recommended location is --resultdir=~/mock/.