$ git clone -n https://src.fedoraproject.org/rpms/perl-RPM-Specfile.git /var/lib/mock/f39-build-1439285-32242/root/chroot_tmpdir/scmroot/perl-RPM-Specfile
Cloning into '/var/lib/mock/f39-build-1439285-32242/root/chroot_tmpdir/scmroot/perl-RPM-Specfile'...
$ git fetch origin 20c7ce8152ad87b397d1500224a50dfa12b0cb7d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-RPM-Specfile
 * [new ref]         20c7ce8152ad87b397d1500224a50dfa12b0cb7d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20c7ce8 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild