$ git clone -n https://src.fedoraproject.org/rpms/rust-ron.git /var/lib/mock/f41-build-side-110780-59085854-6570976/root/chroot_tmpdir/scmroot/rust-ron
Cloning into '/var/lib/mock/f41-build-side-110780-59085854-6570976/root/chroot_tmpdir/scmroot/rust-ron'...
$ git fetch origin 6b1f795c6524bc707b28354ee8132c4191fda534:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-ron
 * [new ref]         6b1f795c6524bc707b28354ee8132c4191fda534 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b1f795 Update to version 0.10.1; Fixes RHBZ#2353220