$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-SmallProf.git /var/lib/mock/f45-build-23156-596/root/chroot_tmpdir/scmroot/perl-Devel-SmallProf
Cloning into '/var/lib/mock/f45-build-23156-596/root/chroot_tmpdir/scmroot/perl-Devel-SmallProf'...
$ git fetch origin 5293a0adb826d7ff4b62033eb7e1d19bfef750b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-SmallProf
 * [new ref]         5293a0adb826d7ff4b62033eb7e1d19bfef750b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5293a0a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild