$ git clone -n https://src.fedoraproject.org/rpms/caja-extensions.git /var/lib/mock/f40-build-791902-137929/root/chroot_tmpdir/scmroot/caja-extensions
Cloning into '/var/lib/mock/f40-build-791902-137929/root/chroot_tmpdir/scmroot/caja-extensions'...
$ git fetch origin fd29cac18aa860cba2d150cdb3ab8297785bbd4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/caja-extensions
 * [new ref]         fd29cac18aa860cba2d150cdb3ab8297785bbd4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd29cac update to 1.28.0