$ git clone -n https://src.fedoraproject.org/rpms/rust-micro-timer.git /var/lib/mock/f41-build-side-1-3134854-39763/root/chroot_tmpdir/scmroot/rust-micro-timer
Cloning into '/var/lib/mock/f41-build-side-1-3134854-39763/root/chroot_tmpdir/scmroot/rust-micro-timer'...
$ git fetch origin 347e894482ea8703f528da73d8bd6e355297371f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-micro-timer
 * [new ref]         347e894482ea8703f528da73d8bd6e355297371f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 347e894 unused leaf package for more than two release cycles