$ git clone -n https://src.fedoraproject.org/rpms/rust-pore.git /var/lib/mock/f41-build-861569-169832/root/chroot_tmpdir/scmroot/rust-pore
Cloning into '/var/lib/mock/f41-build-861569-169832/root/chroot_tmpdir/scmroot/rust-pore'...
$ git fetch origin f521787fd722d74fb6480de13fce93e5bafc39f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pore
 * [new ref]         f521787fd722d74fb6480de13fce93e5bafc39f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f521787 Bump git2 dependency from 0.18 to 0.19