$ git clone -n https://src.fedoraproject.org/rpms/assimp.git /var/lib/mock/f40-build-1971130-25220/root/chroot_tmpdir/scmroot/assimp
Cloning into '/var/lib/mock/f40-build-1971130-25220/root/chroot_tmpdir/scmroot/assimp'...
$ git fetch origin 5ef27d009c9b94ecfbc81e4670732d903bcf8751:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/assimp
 * [new ref]         5ef27d009c9b94ecfbc81e4670732d903bcf8751 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ef27d0 Update to release 5.3.1