$ git clone -n https://src.fedoraproject.org/rpms/perl-Data-Dump.git /var/lib/mock/f45-build-22841-594/root/chroot_tmpdir/scmroot/perl-Data-Dump
Cloning into '/var/lib/mock/f45-build-22841-594/root/chroot_tmpdir/scmroot/perl-Data-Dump'...
$ git fetch origin 6b88a0c57280cac08a13526531f4270f19b3ea72:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Data-Dump
 * [new ref]         6b88a0c57280cac08a13526531f4270f19b3ea72 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b88a0c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild