$ git clone -n https://src.fedoraproject.org/rpms/libtevent.git /var/lib/mock/f45-build-17079-495/root/chroot_tmpdir/scmroot/libtevent
Cloning into '/var/lib/mock/f45-build-17079-495/root/chroot_tmpdir/scmroot/libtevent'...
$ git fetch origin c5a81c7f97d8a2b76cc130ff1b7c71bed74e4f06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtevent
 * [new ref]         c5a81c7f97d8a2b76cc130ff1b7c71bed74e4f06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c5a81c7 Rebuilt libtevent-0.17.2