$ git clone -n https://src.fedoraproject.org/rpms/perl-Ouch.git /var/lib/mock/f45-build-25444-611/root/chroot_tmpdir/scmroot/perl-Ouch
Cloning into '/var/lib/mock/f45-build-25444-611/root/chroot_tmpdir/scmroot/perl-Ouch'...
$ git fetch origin a8e85aafe88e7f8616ca4d2166a229bfe22968aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Ouch
 * [new ref]         a8e85aafe88e7f8616ca4d2166a229bfe22968aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a8e85aa Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild