$ git clone -n https://src.fedoraproject.org/rpms/rust-colorgrad.git /var/lib/mock/f41-build-side-1-3006111-36735/root/chroot_tmpdir/scmroot/rust-colorgrad
Cloning into '/var/lib/mock/f41-build-side-1-3006111-36735/root/chroot_tmpdir/scmroot/rust-colorgrad'...
$ git fetch origin eb091e41e8f5864f970d133a0c8e0f927d74ff84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-colorgrad
 * [new ref]         eb091e41e8f5864f970d133a0c8e0f927d74ff84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb091e4 update to version 0.7.0, fixes RHBZ#2303029