$ git clone -n https://src.fedoraproject.org/rpms/rust-pori.git /var/lib/mock/f38-build-side-42-init-devel-603257-26218/root/chroot_tmpdir/scmroot/rust-pori
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-603257-26218/root/chroot_tmpdir/scmroot/rust-pori'...
$ git fetch origin cbe1bfbd605bc0d5ef05b778aa25dc6c24db8e81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pori
 * [new ref]         cbe1bfbd605bc0d5ef05b778aa25dc6c24db8e81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbe1bfb Added the README