$ git clone -n https://src.fedoraproject.org/rpms/libtevent.git /var/lib/mock/f42-build-3275526-41321/root/chroot_tmpdir/scmroot/libtevent
Cloning into '/var/lib/mock/f42-build-3275526-41321/root/chroot_tmpdir/scmroot/libtevent'...
$ git fetch origin 2dbb444139529231dd3e4cfa961fe9651c4aede1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtevent
 * [new ref]         2dbb444139529231dd3e4cfa961fe9651c4aede1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2dbb444 Add LICENSE file