$ git clone -n https://src.fedoraproject.org/rpms/toolbox.git /var/lib/mock/f41-build-856180-167477/root/chroot_tmpdir/scmroot/toolbox
Cloning into '/var/lib/mock/f41-build-856180-167477/root/chroot_tmpdir/scmroot/toolbox'...
$ git fetch origin 9a86a1837e47a01d80e06a2b11fea3bcc72f526c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolbox
 * [new ref]         9a86a1837e47a01d80e06a2b11fea3bcc72f526c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a86a18 Recommend fuse-overlayfs because old containers created with it need it