$ git clone -n https://src.fedoraproject.org/rpms/rust-arboard.git /var/lib/mock/f41-build-side-1-2998703-36179/root/chroot_tmpdir/scmroot/rust-arboard
Cloning into '/var/lib/mock/f41-build-side-1-2998703-36179/root/chroot_tmpdir/scmroot/rust-arboard'...
$ git fetch origin 8eb816234af0e7a8da9be2f0a24d07e2ec0165c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-arboard
 * [new ref]         8eb816234af0e7a8da9be2f0a24d07e2ec0165c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8eb8162 Update to version 3.4.1; Fixes RHBZ#2277677