$ git clone -n https://src.fedoraproject.org/forks/jcapitao/rpms/rust-coreos-installer.git /var/lib/mock/f43-build-59189743-6571608/root/chroot_tmpdir/scmroot/rust-coreos-installer
Cloning into '/var/lib/mock/f43-build-59189743-6571608/root/chroot_tmpdir/scmroot/rust-coreos-installer'...
$ git fetch origin d8e103b44a272313c0f44cc3185b1270cd79467a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/jcapitao/rpms/rust-coreos-installer
 * [new ref]         d8e103b44a272313c0f44cc3185b1270cd79467a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d8e103b Merge branch 'f42' into rawhide