$ git clone -n https://src.fedoraproject.org/rpms/perl-HTTP-Date.git /var/lib/mock/f45-build-23992-601/root/chroot_tmpdir/scmroot/perl-HTTP-Date
Cloning into '/var/lib/mock/f45-build-23992-601/root/chroot_tmpdir/scmroot/perl-HTTP-Date'...
$ git fetch origin e52b615aff3d2060e0ba59379d7e6858851f28c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-HTTP-Date
 * [new ref]         e52b615aff3d2060e0ba59379d7e6858851f28c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e52b615 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild