$ git clone -n https://src.fedoraproject.org/rpms/rust.git /var/lib/mock/f41-build-side-1-2803263-32817/root/chroot_tmpdir/scmroot/rust
Cloning into '/var/lib/mock/f41-build-side-1-2803263-32817/root/chroot_tmpdir/scmroot/rust'...
$ git fetch origin 04388f6e65312d834c3c26dc8e1bf6650057d292:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust
 * [new ref]         04388f6e65312d834c3c26dc8e1bf6650057d292 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04388f6 Skip crash tests