$ git clone -n https://src.fedoraproject.org/rpms/libvirt.git /var/lib/mock/f40-build-1572432-24016/root/chroot_tmpdir/scmroot/libvirt
Cloning into '/var/lib/mock/f40-build-1572432-24016/root/chroot_tmpdir/scmroot/libvirt'...
$ git fetch origin 0e49b25b5b5a3712faba0c4b8525a34b0f92395f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libvirt
 * [new ref]         0e49b25b5b5a3712faba0c4b8525a34b0f92395f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e49b25 Bump release & add changelog for previous PR commit