$ git clone -n https://src.fedoraproject.org/rpms/perl-AI-Categorizer.git /var/lib/mock/f45-build-21540-586/root/chroot_tmpdir/scmroot/perl-AI-Categorizer
Cloning into '/var/lib/mock/f45-build-21540-586/root/chroot_tmpdir/scmroot/perl-AI-Categorizer'...
$ git fetch origin a6faf4973170dfe3806cce3f87c17363d7819b23:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-AI-Categorizer
 * [new ref]         a6faf4973170dfe3806cce3f87c17363d7819b23 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6faf49 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild