$ git clone -n https://src.fedoraproject.org/rpms/rust-bitvec_helpers.git /var/lib/mock/f41-build-1269558-23100/root/chroot_tmpdir/scmroot/rust-bitvec_helpers
Cloning into '/var/lib/mock/f41-build-1269558-23100/root/chroot_tmpdir/scmroot/rust-bitvec_helpers'...
$ git fetch origin 9dffce4e9b7166946e9a3503c0cc35f30f491768:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitvec_helpers
 * [new ref]         9dffce4e9b7166946e9a3503c0cc35f30f491768 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9dffce4 Update to version 3.1.5; Fixes RHBZ#2292516