$ git clone -n https://src.fedoraproject.org/rpms/rust-atom.git /var/lib/mock/f41-build-side-1-2934408-35233/root/chroot_tmpdir/scmroot/rust-atom
Cloning into '/var/lib/mock/f41-build-side-1-2934408-35233/root/chroot_tmpdir/scmroot/rust-atom'...
$ git fetch origin 0205ea17357e311fc1e0b2305b4b30e2d8c44064:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-atom
 * [new ref]         0205ea17357e311fc1e0b2305b4b30e2d8c44064 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0205ea1 no longer needed