$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime-Format-Atom.git /var/lib/mock/f45-build-22975-595/root/chroot_tmpdir/scmroot/perl-DateTime-Format-Atom
Cloning into '/var/lib/mock/f45-build-22975-595/root/chroot_tmpdir/scmroot/perl-DateTime-Format-Atom'...
$ git fetch origin 3e8c95a0bff42bcf3b7d292984794b85a4734e62:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime-Format-Atom
 * [new ref]         3e8c95a0bff42bcf3b7d292984794b85a4734e62 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3e8c95a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild