$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-Whitehole.git /var/lib/mock/f45-build-22379-591/root/chroot_tmpdir/scmroot/perl-Class-Whitehole
Cloning into '/var/lib/mock/f45-build-22379-591/root/chroot_tmpdir/scmroot/perl-Class-Whitehole'...
$ git fetch origin 1589b6e0fccba9017cb172b6a004e627e24fcf33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-Whitehole
 * [new ref]         1589b6e0fccba9017cb172b6a004e627e24fcf33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1589b6e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild