Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [INFO: Running in chroot: ['su - mockbuild -c \'set -xe ; cd /workdir ; COPR_OWNER=mksanthi COPR_PROJECT=noumenia COPR_PACKAGE=\'"\'"\'\'"\'"\' COPR_RESULTDIR=/workdir /script\'']
Start: chroot ['su - mockbuild -c \'set -xe ; cd /workdir ; COPR_OWNER=mksanthi COPR_PROJECT=noumenia COPR_PACKAGE=\'"\'"\'\'"\'"\' COPR_RESULTDIR=/workdir /script\'']
su: Permission denied
Finish: chroot ['su - mockbuild -c \'set -xe ; cd /workdir ; COPR_OWNER=mksanthi COPR_PROJECT=noumenia COPR_PACKAGE=\'"\'"\'\'"\'"\' COPR_RESULTDIR=/workdir /script\'']
Finish: run
Traceback (most recent call last):
  File "/usr/bin/copr-sources-custom", line 115, in <module>
    run_cmd(mock + ['--chroot', 'su - {0} -c {1}'.format(user, cmd)])
    ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/bin/copr-sources-custom", line 64, in run_cmd
    return subprocess.check_call(command, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.13/subprocess.py", line 419, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['mock', '-r', '/var/lib/copr-rpmbuild/results/mock-config.cfg', '--chroot', 'su - mockbuild -c \'set -xe ; cd /workdir ; COPR_OWNER=mksanthi COPR_PROJECT=noumenia COPR_PACKAGE=\'"\'"\'\'"\'"\' COPR_RESULTDIR=/workdir /script\'']' returned non-zero exit status 1.
Copr build error: Build failed
]: [Error message!]

Issue: I have no idea, it always worked fine before.
Resolution: No idea :)