$ git clone -n https://src.fedoraproject.org/rpms/rust-inferno.git /var/lib/mock/f41-build-side-1-2992617-36014/root/chroot_tmpdir/scmroot/rust-inferno
Cloning into '/var/lib/mock/f41-build-side-1-2992617-36014/root/chroot_tmpdir/scmroot/rust-inferno'...
$ git fetch origin dfca3666e9121c60fee055c0f2113b551a58de2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-inferno
 * [new ref]         dfca3666e9121c60fee055c0f2113b551a58de2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfca366 Update to version 0.11.21; Fixes RHBZ#2297868