$ git clone -n https://src.fedoraproject.org/rpms/rust-fn-error-context.git /var/lib/mock/f41-build-side-1-2769626-32117/root/chroot_tmpdir/scmroot/rust-fn-error-context
Cloning into '/var/lib/mock/f41-build-side-1-2769626-32117/root/chroot_tmpdir/scmroot/rust-fn-error-context'...
$ git fetch origin 583cba6522930bcb9d7c81f678d374a20df41db9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fn-error-context
 * [new ref]         583cba6522930bcb9d7c81f678d374a20df41db9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 583cba6 Orphaned for 6+ weeks