2026-03-11 15:15:14,990 [INFO] {358582} koji.build.buildroot:509 Running mock as kojibuilder
INFO: mock.py version 6.6 starting (python version = 3.12.12, NVR = mock-6.6-1.el10_1.alma_altarch), args: /usr/libexec/mock/mock -r koji/v9.0-u-ydi1-10930-29399 --init
Start(bootstrap): init plugins
INFO: selinux enabled
Finish(bootstrap): init plugins
Start: init plugins
INFO: selinux enabled
Finish: init plugins
INFO: Signal handler active
Start: run
Start: clean chroot
Finish: clean chroot
Mock Version: 6.6
INFO: Mock Version: 6.6
Start(bootstrap): chroot init
INFO: calling preinit hooks
INFO: Package manager dnf4 detected and used (fallback)
Start(bootstrap): installing dnf tooling
ERROR: can only concatenate str (not "bytes") to str
Traceback (most recent call last):
  File "/usr/libexec/mock/mock", line 1132, in <module>
    exitStatus = main()
                 ^^^^^^
  File "/usr/lib/python3.12/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
             ^^^^^^^^^^^^^^^^^
  File "/usr/libexec/mock/mock", line 884, in main
    result = run_command(options, args, config_opts, commands, buildroot)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
             ^^^^^^^^^^^^^^^^^
  File "/usr/libexec/mock/mock", line 915, in run_command
    commands.init()
  File "/usr/lib/python3.12/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
             ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mockbuild/backend.py", line 160, in init
    self.bootstrap_buildroot.initialize(**kwargs)
  File "/usr/lib/python3.12/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
             ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mockbuild/buildroot.py", line 206, in initialize
    self._init(prebuild=prebuild)
  File "/usr/lib/python3.12/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
             ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mockbuild/buildroot.py", line 354, in _init
    self._init_pkg_management()
  File "/usr/lib/python3.12/site-packages/mockbuild/trace_decorator.py", line 93, in trace
    result = func(*args, **kw)
             ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.12/site-packages/mockbuild/buildroot.py", line 574, in _init_pkg_management
    self.pkg_manager.init_install_output += subprocess.check_output(['ln', '-s', 'usr/bin', os.path.join(rootpath, 'bin')], stderr=subprocess.STDOUT)
TypeError: can only concatenate str (not "bytes") to str