INFO buildroot.py:348:  Mock Version: 1.4.9
DEBUG util.py:124:  touching file: /var/lib/mock/f31-build-95770-32735/root/etc/fstab
DEBUG util.py:124:  touching file: /var/lib/mock/f31-build-95770-32735/root/etc/yum/yum.conf
DEBUG util.py:124:  touching file: /var/lib/mock/f31-build-95770-32735/root/etc/dnf/dnf.conf
DEBUG util.py:124:  touching file: /var/lib/mock/f31-build-95770-32735/root/var/log/yum.log
DEBUG util.py:111:  ensuring that dir exists: /var/lib/mock/f31-build-95770-32735/root/proc
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/bin/mount', '-n', '-t', 'proc', 'proc', '/var/lib/mock/f31-build-95770-32735/root/proc'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'en_US.UTF-8'} and shell False
DEBUG util.py:624:  Child return code was: 0
DEBUG util.py:111:  ensuring that dir exists: /var/lib/mock/f31-build-95770-32735/root/sys
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/bin/mount', '-n', '-t', 'sysfs', 'sysfs', '/var/lib/mock/f31-build-95770-32735/root/sys'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'en_US.UTF-8'} and shell False
DEBUG util.py:624:  Child return code was: 0
DEBUG buildroot.py:142:  rootdir = /var/lib/mock/f31-build-95770-32735/root
DEBUG buildroot.py:143:  resultdir = /var/lib/mock/f31-build-95770-32735/result
DEBUG util.py:111:  ensuring that dir exists: /var/lib/mock/f31-build-95770-32735/root/etc/pki/mock
DEBUG util.py:114:  creating dir: /var/lib/mock/f31-build-95770-32735/root/etc/pki/mock
DEBUG util.py:111:  ensuring that dir exists: /var/lib/mock/f31-build-95770-32735/root/etc/dnf
DEBUG package_manager.py:111:  ['/usr/bin/dnf', '--installroot', '/var/lib/mock/f31-build-95770-32735/root/', '--setopt=install_weak_deps=0', 'groupinstall', 'appliance-build']
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/usr/bin/dnf', '--installroot', '/var/lib/mock/f31-build-95770-32735/root/', '--setopt=install_weak_deps=0', 'groupinstall', 'appliance-build'] with env {'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"', 'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'en_US.UTF-8', 'http_proxy': 'http://192.168.0.254:3128', 'https_proxy': 'http://192.168.0.254:3128', 'LC_MESSAGES': 'C.UTF-8'} and shell False
DEBUG util.py:482:  BUILDSTDERR: Unable to detect release version (use '--releasever' to specify release version)