$ git clone -n https://src.fedoraproject.org/rpms/rust-onefetch.git /var/lib/mock/f41-build-850200-165163/root/chroot_tmpdir/scmroot/rust-onefetch
Cloning into '/var/lib/mock/f41-build-850200-165163/root/chroot_tmpdir/scmroot/rust-onefetch'...
$ git fetch origin 34b953208be8c1a30d9f383ca60641d9f2bcadf4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-onefetch
 * [new ref]         34b953208be8c1a30d9f383ca60641d9f2bcadf4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34b9532 Initial package (close RHBZ#2299338)