$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-Virt.git /var/lib/mock/f40-build-2676981-67879/root/chroot_tmpdir/scmroot/perl-Sys-Virt
Cloning into '/var/lib/mock/f40-build-2676981-67879/root/chroot_tmpdir/scmroot/perl-Sys-Virt'...
$ git fetch origin 0c66bc12a1fb9405d08bc184a9b92396ede536af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-Virt
 * [new ref]         0c66bc12a1fb9405d08bc184a9b92396ede536af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0c66bc1 10.1.0 bump (rhbz#2267343)