$ git clone -n https://src.fedoraproject.org/rpms/rust-nu-test-support.git /var/lib/mock/f42-build-side-1-3589354-46957/root/chroot_tmpdir/scmroot/rust-nu-test-support
Cloning into '/var/lib/mock/f42-build-side-1-3589354-46957/root/chroot_tmpdir/scmroot/rust-nu-test-support'...
$ git fetch origin c77c180b015102176085089a9b0d0610d9e971a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nu-test-support
 * [new ref]         c77c180b015102176085089a9b0d0610d9e971a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c77c180 Allow which 8